昆仑-祁连山造山带是我国最重要软玉成矿带，申请人和合作者在甘肃北部古丝绸之路北线（北山地区和敦煌地块）发现我国战国-汉代古老玉矿采矿遗址群，厘定出100多个采坑并发现大量古玉料。本项目拟对新发现玉矿（料）成矿岩石、相关花岗质岩石及基底变质岩进行系统元素地球化学，Si-O-Sr同位素地球化学，锆石/榍石U-Pb年代学和Hf同位素等的综合研究，揭示古玉（矿）形成物理化学条件、形成机制，软玉形成与古亚洲洋构造域板块俯冲拼贴过程时空联系及深部地质过程响应；利用现代微区微束分析技术(EMPA, LA-(MC)-ICPMS和SIMS等)对新发现古玉料进行系统岩石地球化学和同位素组成测试，建立其地球化学“指纹”，并通过与新疆及丝绸之路一带中原出土古玉（软玉）的对比，追溯其迁徙路径，揭示汉代以前该区玉料工业对中原传统古玉供应体系的影响，为反演我国古代丝绸之路早期玉石文明的形成与演化提供新的约束。

Kunlun-Qilian orogenic belt was considered as the most important nephrite mineralization belt in China. Two groups of historic mining sites of nephrite jades in the Warring States to Han dynasty, including over 100 mining pits, were discovered along north branch of ancient silk road in North Mountain region and Dunhuang block, inferring that there occurred intensive mineralization of nephrite jades in geology and important mining activity of jade materials in Chinese history. This project aims at studying the relationship between the mineralization of nephrite jades and geological tectonics through geochemical methods including major & minor elements and isotopes (e.g. Si,O,Sr,Li) of nephrites and associate granite rocks and metamorphic basement rocks, U-Pb dating and Hf isotopes of zircons/sphenes in relation to mineralization, in order to reveal the forming condition and mechanism of nephrites and their response to deep geological process, and finally to explore the temporal and spatial relation between the mineralization of nephrites and the collision and subduction of the Paleo-Asiatic/Tethystectonic domains. Moreover, we will conduct comprehensive petrochemical and isotopic analyses on nephrite materials from these historic mining sites by means of modern micro-probe analysis techniques such as EMPA,LA-(MC)-ICPMS and SIMS, for setting up their geochemical fingerprints. Finally, these results will be compared and contrasted with unearthed jadewares and jade materials from other locations in order to trace the spreading path and influence of the nephrite materials from these historic mining sites on traditional supply system of jade materials in central China at that time, and provide constraints on the birth and development of early civilization on the ancient silk road.