China and the steppe: technological study of precious metalwork from Xigoupan Tomb 2 (4th–3rd c. BCE) in the Ordos region, Inner Mongolia
Heritage Science volume 9, Article number: 46 (2021)
Technology employed by the ancient goldsmiths is traceable through archaeometallurgy. Using non-destructive analytical methods, namely, a 3D digital microscopy and a scanning electron microscopy with energy dispersive spectrometer (SEM–EDS), we investigated the manufacturing techniques and chemical composition of gold and silver artefacts recovered from Tomb 2 (M2), the richest find from Xigoupan cemetery (fourth-third century BCE) in the northern part of Jungar Banner, Inner Mongolia. The present research contributes to a better understanding of the inventive nature of precious metal working industry in early China (eighth-third century BCE). First, cultural interchange was evidenced in the metalwork examined, notably as being closely linked to techniques emerging from the Eurasian steppes. In Xigoupan M2, the ornamentation of sheet works in the Scytho-Siberian animal style was seen to be clearly influenced by the central Asian steppe goldsmithing practice, while certain cast items were typical of the Chinese tradition. Second, our analysis reveals that the gold appliqués with raised animal figures that were previously thought to be repoussé work have actually been made with double-sided carving. We consider such a new technology as one of local inventions that was inspired by methods arriving from the central Asian steppes. In addition, our analysis of elemental composition reveals that the gold artefacts found in Xigoupan M2 to be made of natural gold, while the horse harness ornament is made of pure silver. These results, combined with the study of the existing data pertaining to comparable examples, attest to the shared craftsmanship in prestige metal production across the northern Chinese states, especially with regard to the pre-imperial period Qin workshop.
As a symbol of prestige and power, gold was treasured for its monetary and aesthetic value by both pastoral and sedentary people in ancient Eurasia. Gold use had a much longer history in the Eurasian steppes, but it was entirely new to people living in the Central Plains of China between the 9th and the second century BCE. From the fourth century BCE onward, on China’s northwest frontiers, new metal working technologies and iconographies were introduced and incorporated into local social practices, and then further linked with the construction of individual or group identities in these new contexts of interaction [1,2,3]. The influence of steppe art on the pre-imperial period gold artifacts found in Northwest China has been extensively discussed by many scholars [4, 5]. It is generally accepted that gold-making technology was one of the foreign borrowings when China intensively interacted with the mobile pastoralists in the Eurasian steppes between the fifth and fourth century BCE [6, 7]. However, some key questions as to whether and which local inventions occurred as a response to outside stimuli, however, remain insufficiently explored.
The remarkable discovery of gold and silver artefacts on Chinese northern frontiers provides valuable material with which we can gain a better understanding of the early development of gold-making technologies in early China. The Xigoupan cemetery in the north of Jungar Banner, the Ordos region of Inner Mongolia (Fig. 1), was excavated between 1979 and 1989, comprising twelve rectangular shaft graves. The intact M2 yielded the largest number of gold and silver artefacts. Here, a male adult was interred with seven bronze arrow heads, four deer-shaped objects and seven silver harness ornaments. A gold torc was found around his neck and a pair of gold earrings had been placed at his head along with a small gold roundel. At his right hand was an iron sword with a wooden scabbard elaborately decorated with gold appliqués. A pair of gold belt plaques were found at his waist with some silver foils scattered around. In M3 bronze objects prevailed and the other tombs were more simply furnished and contained potteries, iron knives and bronze rings . This burial site was customarily considered as to have been a major hub of the Xiongnu (209 BCE-150 CE), a tribal confederation described in the Han texts . However, materials from the site, including M2, date back to before the Xiongnu era.
Early pastoral groups living in the lands in present-day Inner Mongolia since the beginning of recorded Chinese history are known to us as the Rong, Di and Hu that have been often described in the written texts , but little is known about their technologies, art forms and power relationships. The remarkable discoveries of objects made from precious metals in Xigoupan and other sites in the Ordos region attracted wide scholarly attentions, and encourages a more in-depth examination of the production, consumption and circulation of prestige goods and power relationships on the northwest Chinese frontiers. Some of the cast gold and silver artifacts of Chinese origin uncovered at the Xigoupan site were thought to be imports from northern China, or cast by Chinese craftsmen in local employ [11,12,13,14]. The accumulation of this type of luxury gold items in the elite tombs at Xigoupan attested to prestige goods-centered economic and cultural interactions with China [15, 16]. Quite a few scientific analyses have been undertaken to examine the technical features of the gold and silver artifacts found in the Ordos region. For example, Wang and Harutaro applied portable XRF methods for the elemental analysis of 57 gold and silver objects from the Ordos Museum Collection, including 19 gold and eight silver artifacts found in Xigoupan M2. The results showed that the precious metalwork uncovered there was similar in composition to other contemporary samples from the Nianfangqu and Shihuigou sites in Inner Mongolia . Due to the limitations of a portable XRF analysis [18, 19] and the insufficient study of manufacturing techniques, the questions about the provenance and origin of the Ordos artefacts, especially the gold appliqués rendered in the Scytho-Siberian animal style, remain unsolved .
This paper presents an interdisciplinary scheme employed for studying the ancient technologies of precious metalwork, with the goal of understanding the technical practice, style and craftworking traditions that constituted group membership of those artisans from whom the elite commissioned the precious metalwork on northwest Chinese frontiers. This research brings material science into the domains of artistic and archaeological inquiries, drawing comparisons between manufacturing techniques, styles and iconography. Considering that typological analyses have limitations in the case of unique or unprecedented objects, the systematic investigation conducted here into the technical features, chemical composition, stylistic characteristics and craftsmanship traditions enable us to identify whether and why these artefacts were created by local innovators in response to a particular stimulus, typically from the outside world. Multiple non-invasive methods, such as a 3D digital microscopy, and a scanning electron microscopy, including an energy dispersive spectroscopy (SEM–EDS), were used to examine the technical features of the samples in order to obtain a greater depth of analysis and attain a better integration of the compositional data.
Samples and methods
Five representative samples were selected from a variety of gold and silver artefacts originally excavated from Xigoupan M2 and currently preserved in the Ordos Museum in Inner Mongolia. The objects selected for the non-destructive analysis conducted as part of this research were labelled XGP 1769.7, XGP1770.8, XGP1776.14, XGP1785.23 and XGP1800.38 (Table 1).
A rectangular gold appliqué with reclining horses in profile, measuring 11.7 cm in length and 5.7 cm in width. The four horses were rendered in two mirror-image pairs vertically flanking the central line vertically. Each pair is composed of two horses with bent legs facing rightwards. (Fig. 2a).
A gold appliqué with low-relief deer images, measuring 10.9 cm in length and 7.9 cm in width. The rectangular plaque is divided into two parts by several raised horizontal lines in the center. Both the upper and the lower parts depict a deer with flowing antlers and bent legs respectively. Apart from the mirror-image pairs of reclining horses, these two deer figures are positioned in opposite directions. Several small holes are perforated into the edges for the purpose of sewing onto cloth or leather (Fig. 2b).
A gold appliqué with a pair of beasts in mirror image format, measuring 7.6 cm in length and 7.0 cm in width. The rectangular appliqué has a flattened surface. The thin gold sheet is decorated with a pair of recumbent beasts with limbs extended forward and the tail rolled up within the raised border lines. Seven appliqués with the similar designs and dimensions were excavated from Tomb 2 of Xigoupan cemetery (Fig. 2c).
A gold appliqué in the form of a standing eagle or bird with outstretched wings and a tail, measuring 4.7 cm in length and 3.4 cm in width. The facial representation of the bird contains a round eye and a very long curved beak. The appliqué is decorated with raised lines, with four perforations along the edges. Seven similar objects to this one were found in this burial site (Fig. 2d).
A silver horse harness ornament in the form of a feline face with raptor elements, measuring 2.9 in length and 6.0 cm in width. The feline shows a frontal image with ears and paws. A stylized bird’s head with a longer spiral hook appears to be holding the tiger’s head. Underneath the longer hook, a pair of confronting raptor heads appear in a cloud pattern. The reversed side reveals one large square attachment loop, and some incised Chinese characters are noticeable. Seven similarly decorated silver objects were found in this burial site (Fig. 3a).
We conducted non-destructive analyses using a combination of 3D digital microscopy and scanning electron microscopy with an energy dispersive spectrometer (SEM–EDS). The microscopic observation entailed examining the tool marks on the front of each artefact and the deformations on the back. The observation of tool marks enabled us to trace the specific manufacturing techniques and decorative methods employed by the artisans. The metal composition was also obtained by means of SEM–EDS. A micro scale investigation is essential to the identification of diagnostic markers related to the particular processes applied to the materials.
Optical microscopic analysis (OM)
The samples were photographed using a 3D digital microscopy (HIROX KH-7700, Japan) with large scene depth. The observations were carried out with high-resolution HD (1600 Å ~ 1200), as well as a multi-focus system.
Scanning electron microscopy with energy dispersive spectrometer (SEM–EDS)
The morphology analyses were performed using a SEM (ZEISS EVOMA25, Germany) for the purpose of observing the surface of each artefact as it relates to the manufacturing process. The composition analyses were undertaken by EDS (Oxford X-MAX 20, UK). The SEM–EDS operating conditions consisted of a line-avg mode with 20 kV accelerating voltage and an EDS working distance of around 8–9 mm. The measurement time for each analysis was set as 60 s, with around 30% of dead time to maintain Si-Li detector saturation. The standardless calibration mode is employed with INCA EDS software, with the default critical energy line series selected for each targeted element (e.g., copper K lines). The beam size is 40 μA. The minimum detect limit for gold, silver and copper is 0.1%. Standard deviation is around 1% and relative error is around ± 3%. At least three micro-areas were analyzed in every zone, and the elemental results detected were averaged and normalized.
The microscopic examination showed that the silver horse harness ornament (XGP 1800.38) was made through casting, and that certain facial details of the feline’s head were additionally executed by carving. The feline is depicted in a lively way. The bulging eyes of its head are formed of a convex boss with an incised circular rim, and then the corners of its eyes extended to the coiled ears. The orbital lines of the eyes appeared flat and smooth under analysis. Sunken lines were made by carving on the front of the eyes, as seen in Fig. 3b. Some tiny pores of various dimensions appear on the surface of the forehead, resulting from the metal casting process (Fig. 3a). Silver would absorb a lot of oxygen during melting, it’s maybe a common phenomenon in ancient silver casting. The irregular tiny pores became more evident in the SEM image, and the porosity seems to have no uniform pattern. The occasional pores observed beyond the vicinity of the surface are very small (Fig. 3c). These technical details revealed by the microscopy indicate that the horse harness ornament was made using the casting technique. In addition, some Chinese characters (see Discussion) were carved on the underside after the casting was completed, as seen in the magnified image.
The microscopic examination revealed a range of common features amongst the group of gold appliqués analyzed, suggesting that they were made by double-sided carving using a pointed tool, but not a very sharp one. The features identified under the microscope and via the SEM include cutting edges, carved or incised marks, and perforated traces. The SEM–EDS results appear to be consistent with the results of the OM analysis of the appliqués (XGP 1769.7, 1770.8, 1776.14, and 1785.23).
Plaque XGP 1769.7 was seen to bear raised border lines in a rectangular form, with the thin gold sheet having been given folded edges to increase its strength. There are small pierced holes on the edge of the plaque, indicating that it was originally attached to an object. While the horse figures contained in the sample look very similar in form and dimension, there are certain subtle variations that could be seen in the ornamental details. The microscopic examination allowed for the identification of decoration carried out with particular tools. As seen in Fig. 4a, the convex border line A was formed by deep carving from the back, while the craftsmen repetitively carved the other two concave border lines, B1 and B2, from the front to create three-dimensional effects (Fig. 4b). Likewise, the double-sided carving was also employed to create the raised lines of the horse ear (Fig. 4c, d). The ornamental details of the horses’ manes are highlighted by convex lines D1-D5, made by deep incising from the back, while the concave ones, E1 and E2, were carved onto the front, as seen in Fig. 4e. The raised figure was created with the double-sided carving, and no trace of hammering on the inside could be found.
Samples XGP 1770.8, 1776.14 and 1785.23 were made in the same manner. The three appliqués were made of gold plates with a similar thickness (80 μm in average), much thinner than the plaque with reclining horses. As seen in the magnified image of XGP1770.8, all carvings had a very sharp edges on both sides, such as those found in the details of the deer’s head, antlers and ears (Fig. 5a), indicating the use of a pointed tool. Such a tool is likely to have been made of bone, for a bronze one could easily tear the gold foil. The deer’s head and body were carved with precision. Under the microscope, it was possible to see that the raised line, A, of the antler was formed by deep carving from the back, while the concave lines, B, were made by shallow carving from the front (Fig. 5b, c). The SEM examination further revealed concurrent irregularities and imperfections in the incised lines connecting the confronting arcs (Fig. 5d, e), indicating that these lines had been made freehand.
Similarly, the low-relief of XGP 1776.14 was also created by double-sided carving. The front of the raised animal figures appears convex while the underside looks sunken. A perforated hole was found at each corner of the appliqué. The details under the microscope reveal that the convex line, A, was made from the back and the concave lines, B, were incised from the front (Fig. 6a, b). Some small cracks were generated by means of deeper carving (Fig. 6c). The thin gold sheet is only 80–100 um thick (Fig. 6d), and the deep carving emerged more markedly in the SEM image (Fig. 6e).
Sample XGP 1785.23 is shaped as a standing eagle. The initial contour of the eagle was carved out from a thin gold sheet. The surface observed by the optical microscope exhibits similar marks of having been carved on its both sides (Fig. 7a, b). The edges show a parallel line of cutting pre-tracing and straight, clearly visible marks (Fig. 7c) in the SEM images. The microscopy also identified several small cracks, which were more obvious on the outer surface as seen in Fig. 7d, resulting from stronger carving. Perforations could be seen on the ends of the eagle-shaped appliqué that were made using circular section punching (Fig. 7e), and which was easily recognizable from the round burrs seen on the back of the metal work.
Using SEM–EDS, our analysis of the metal composition of the gold and silver artefacts of Xigoupan M2 showed that the gold plaque (XGP 1769.7) was produced with natural gold, containing 81.1–91.0% gold and 9.0–18.9% silver without copper. A similar compositional pattern is also found in the metal elements of the sheet gold depicting beasts facing one another (XGP1776.14), namely, 88.6–91.0% gold and 9.0–11.4% silver without copper. The remaining items contained a higher percentage of gold and varying amounts of silver with a very low percentage of copper: the gold appliqué (XGP1770.8) consisted of 78.4–83.2% gold, 15.5–19.8% silver and 1.3–1.9% copper while the eagle-shaped appliqué (XGP 1785.23) was made up of 88.2–93.2% gold, 6.0–12.6% silver and 0.8–1.0% copper (Table 2). These percentages fall in the natural permissible range identifying natural gold from northwest China . In contrast, the concentration of silver in the silver horse harness ornament (XGP1800.38) was between 87.1 and 97.6% (Table 3).
Gold owes its cultural and economic significance to its extraordinary malleability. In antiquity, a gold ingot or rod was beaten until it turned into a thin sheet, following which specific decorations could be created through a variety of methods: carving, chasing, engraving and repoussé, or even embellished with granulation and filigree. In Bronze Age China, gold foils were used for the surface decoration of bronzes and lacquers; one of the finest examples of these is the sheet gold, about 10 μm thick, found at the Yinxu site (thirteenth-eleventh century BCE) in Anyang . The serial production of gold appliqués took place on northwest Chinese frontiers as early as the eighth century BCE. In tomb 3 of Dongtalede cemetery (eighth-seventh century BCE) in the Xinjiang Altai region, a large number of gold appliqués embossed with snow leopards were found, together with gold granulated ornaments, earrings and beech-nut pendants . Such serially produced gold and silver plaques became more common in the Ordos region during the fourth century and the third century BCE. In addition to the remarkable find uncovered in Xigoupan cemetery, other excellent examples include the gold plaques with entwined dragons excavated from a golden hoard at Nianfangqu , the silver plates in the form of hedgehogs discovered in the burial site of Shihuigou , and the recumbent tigers made of pressed gold sheet work from the Aluchaideng cemetery  in Inner Mongolia. These wealthy tombs containing precious metals belonged to the powerful elites of pastoral groups on the northwestern frontiers, many of which were ascribed to the Xiongnu who emerged as the leading tribe in the confederation of mobile pastoralists in the Mongolian steppes [27, 28].
It is worth noting that the gold appliqués found in Xigoupan employed the technique of double-sided carving to create a three-dimensional design, which was previously considered repoussé work . Gold works decorated with double-sided carving prevailed in the Xigoupan cemetery, differing from their counterparts that have been recovered at other Iron Age burial sites (eighth-third century BCE) in Northwest China, as well as across a vast territory extending from the Central Asian steppes west to the Black Sea region, in where a large number of gold works with repetitive low-relief designs were found to have been mass-produced through the mould-pressing technique. In those, a thin sheet gold was hammered onto a concave mould or die to produce a raised figure. In Tomb 4 (fourth-third century BCE) of Majiayuan cemetery in Gansu, the gold plaques embossed with combating felines (Fig. 8a) were serially made using a mould or matrix . Typical examples include a series of gold appliqués in the form of ram’s heads (Fig. 8b) from Tomb 1 (fourth-third century BCE) of Xigou in the Eastern Tianshan Mountains, Xinjiang Uygur Autonomous Region , and the bird-shaped plaques found in Aluchadeng (fourth-third century BCE) in Inner Mongolia [26, 31]. Numerous gold appliqués of this type were widespread in the central Asian steppes, such as the princely kurgans in Arzhan II (seventh century BCE) in south Siberia [32, 33], the elite burials of early nomads in Barrow 6 of Taksai I (sixth-fifth century BCE) , and the Issyk kurgan (fourth-third century BCE)  in Kazakhstan, where prestige gold was used as a symbol of status and power amongst the highly mobile populations. The strong affinity manifested in these ornaments with the decorative traditions of the Scytho-Siberian animal style reminds us of the extensive contacts between China and the early mobile pastoralists in central Asian steppes [36, 37].
Apart from the sheet gold that was found to be crafted using mould and matrix, the gold appliqués of Xigoupan are clearly related to styles practiced in the Qin metalwork tradition. A considerable number of sheet works decorated with double-sided carving were found to have accumulated in the burial sites in Gansu, such as the silver plaques (Fig. 9a) found in the elite tombs in Qingshui (fourth-third century BCE), Gansu province, and the gold and silver plates (Fig. 9b) found in M3 and M5 of Majiayuan cemetery (fourth-third century BCE) . In the decoration of the Qingshui plaques, the curvilinear grooves representing the striped fur of the ibex were made by means of double-sided carving. Similar examples appeared much earlier in the decorations of horse-armors made of thin gold sheets and featuring raptor heads (Fig. 9c, d), retrieved from Dabuzishan site (eighth-fifth century BCE) of the Qin Lord, Lixian County of Gansu province . As shown in the scientific analysis conducted for the current research, the double-sided carving technique was employed to create the low-relief decoration of the Xigoupan appliqués, as one of the main plastic deformation techniques used at the time. Under the microscope, the tool marks of carving can be clearly seen in the details of the sunken lines on the surface of the gold plate found in Qingshui, Gansu (Fig. 9e, f). There has been a rich tradition of carving in ancient China since the Neolithic period, and it was commonly used for the surface decoration of jades, bones, bronzes and lacquers evolved to become very sophisticated, as seen in the jade ornaments of the Longshan culture (3500–2000 BCE) in Northwest China . From the fourth century BCE onward, using double-sided carving to create the three-dimensional effects of animal figures found the gold sheets appeared as a local invention in the pre-imperial Qin territory, when the serially produced gold appliqués made by working with mould and matrix were widespread in the northwest of China and the central Asian steppes. The wealth of gold artefacts found in the pre-imperial Qin territory, such as in Baoji, Lixian, and Qingshui, indicates the increasing demands of the ruling elite for prestige gold at that time .
In Xigoupan M2, epigraphic evidence of some of cast gold and silver found attested to Chinese origins. The gold belt plaques (Fig. 10a–c) and the silver horse harness ornaments (Fig. 10d) inscribed with “shaofu少府 (Palace Revenues)” and “gusi故寺 (former Private Storehouses)” were considered official products of the Qin and Zhao workshops respectively. Interestingly, the toolkit typically used by a coppersmith, including an array of clay models used for casting “steppe style” bronze plaques, has been archaeologically documented in a Qin craftsman’s tomb (fourth-third century BCE) in Xi’an, Shaanxi province . Here, the clay models were decorated with ibex, hoofed animals with raptor-headed appendages and other zoomorphic motifs clearly linked to the Scytho-Siberian animal style that appeared in the central Asian steppes. The designation of “Scytho-Siberian” animal style pertains to the artistic production of culturally related mobile pastoralists in a vast region stretching from China to the northern Black Sea area . The clay model found in Xi’an is indisputable evidence of the Qin manufacture of luxury metalwork for the steppes . In addition to the discoveries made at Xigoupan M2, gold belt plaques in the Scytho-Siberian artistic style were also found in the elite burials in Xinzhuangtou M30 in the Yan State in Yixian, Hebei province , and in the Aluchaideng cemetery in Inner Mongolia , many of which must have been commissioned to meet the demands and cultural needs of their pastoral owners .
Together with manufacturing technologies, the sources of precious metals are also of key archaeological interest. The fact that gold mines (e.g., primary mountain deposits or alluvial deposits) are only located in a few geographically constrained places has meant that people have moved the ores around, contributing significantly to the ever-increasing networks of trade and exchange. Based on the aforementioned stylistic and technological surveys above mentioned, a large number of chemical analyses of gold artefacts was synthesized for the comparative purposes of the current study (Fig. 11 and online supplementary document). Natural gold is often associated with various impurities, among which silver and copper are most frequently reported in the literature. The range of silver and copper in natural gold are around nil to 50% and nil to 1–2% respectively. A higher percentage of copper is therefore more sensitive to artificial alloying [48,49,50,51]. Fig. 11 shows that the percentage of silver (~ 10–20%) and copper (< 2%) in the gold artefacts found in Xigoupan clearly overlap with that found in the majority of data pertaining to such artefacts in Central Asia (e.g., Mongolia or Sayan-Altai Mt.), other places on the China’s northwest frontiers, and the Central Plains (Shaanxi, 4th–3rd century BCE), suggesting that natural gold was the major type of raw material in these regions [52,53,54]. Given the broad scope of time and space concerned here, as well as the wide range of silver percentage found (5–25%), multiple sources of gold may have been extracted in the first millennium BCE around East Asia.
It is, however, interesting to note that a group of artefacts dated to the 4th–3rd Century BCE in Central Asia stands out due to its much higher level of both silver (> 20%) and copper (2–8%) . The latter level of copper is beyond the normal level of impurity found in natural gold. One highly likely reason for this is the deliberate addition of copper in that era, possibly silver as well, to gold through artificial alloying. The addition of copper can create a more rose-colored tone for gold objects. As further supporting evidence for the former assertions, five golden plaques recovered from Xigoupan M2 and dated to a similar period, analyzed by Wang et al. , do not only show noticeable amounts of copper (~ 4–6%), but the highest level of silver in the database (see top-right in Fig. 11). It appears highly likely that these plaques were also deliberately alloyed. More intriguingly still, tin (~ 0.2%) and lead (0.1%) were also reported for these plaques. If normalized against copper, these three elements show the proper composition for leaded bronze (94:4:2), a common alloying recipe for copper metallurgy in late Bronze Age China . Tin and lead could be just impurities associated with gold, but it is also possible that the leaded bronze was recycled to (re)alloy the gold before casting.
Conclusion and future research
The results of the current scientific analysis shed new light on the technology used to make the gold and silver artefacts found at Xigoupan. The gold appliqués discovered in Xigoupan M2 in the Ordos Region of Inner Mongolia present common technical features in the use of the double-sided carving technique with those from Lixian and Qingshui sites in Gansu, where the Qin state became a predominant power and extensively interacted with their northern neighbors between eighth and third century BCE. This suggests the emergence of a major local technological innovation in goldworking in Northwest China, whereby the Xigoupan metal work can be attributed to the Qin workshop. The current synthesis of the chemical analyses of gold artefacts found in Central Asia, China’s northwest frontiers and the Central Plains shows that multiple sources of natural gold were employed around the first millennium BCE in Eastern Eurasia, although the exact locations of these sources are yet unknown. Some of the examined Xigoupan gold artefacts were made by intentional alloying. The gold artefacts possessing similar technical features in Xigoupan, Lixian and Qingshui also show a similar range of silver and copper (online Additional files 1, 2). Further analyses of trace elements and lead isotopes will be vital in future research in order to confirm whether such artefacts also share the same source of raw material.
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The authors wish to thank Xiaojuan Dang and Juan Ji of Institute for the Preservation of Culture Heritage, who provided assistances for the microscopic and SEM-EDS examinations. Special thanks go to Katheryn M Linduff of Pittsburgh University, Arman Beisenov of Begazy-Tasmola Research Center of History and Archaeology in Kazakhstan and Aleksandr Tairov of South Ural State University for sharing useful information of elemental composition of early gold in Kazakhstan and Southern Urals. We are also grateful to the Ordos Museum, Inner Mongolia for their trust in pursuing the scientific study of the valuable museum collections. Thanks are also due to the anonymous reviewers for their helpful comments.
This work is supported by the Humanities and Social Science Foundation of Ministry of Education of China (20YJAZH071), and the Key Project of the National Social Science Foundation of China (18ZDA172).
The authors declare no competing interests.
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Liu, Y., Li, R., Yang, J. et al. China and the steppe: technological study of precious metalwork from Xigoupan Tomb 2 (4th–3rd c. BCE) in the Ordos region, Inner Mongolia. Herit Sci 9, 46 (2021). https://doi.org/10.1186/s40494-021-00520-5
- Double-sided carving
- Gold and silver
- Xigoupan Tomb
- Early China
- Animal style