| 新疆东昆仑东部砂金分布及成因探讨 |
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| 引用本文： | 包安明.新疆东昆仑东部砂金分布及成因探讨[J].干旱区地理,1998,21(3):31-36. |
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| 作者姓名： | 包安明 |
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| 作者单位： | 中国科学院新疆生态与地理研究所!乌鲁木齐830011 |
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| 基金项目： | 国家攻关305项目!96－06－07 |
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| 摘 要： | 通过对新疆东昆仑东部地区砂金资源的野外实地调查，研究了区内砂金的分布类型，总结分析了砂金分布特征及规律。在成矿地质背景分析基础上，结合本地地理环境特点，气候特点，提出该区砂金的分布及形成与区内特定的高寒环境相关，并对原生金的寻找远景进行了初步评价。
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| 关 键 词： | 东昆仑 砂金 高寒冻干带 新疆 金矿床 矿床成因 |
DISTRIBUTION AND ORIGIN OF GOLD PLACERS OF THE EAST KUNLUN MTS.,XINJIANG,CHINA |
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| Bao Anming.DISTRIBUTION AND ORIGIN OF GOLD PLACERS OF THE EAST KUNLUN MTS.,XINJIANG,CHINA[J].Arid Land Geography,1998,21(3):31-36. |
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| Authors: | Bao Anming |
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| Abstract: | After field survey on the gold placers of the eastern area of the Eastern Kunlun Mts., Xinjiang, China, the gold placer deposits are classified into two main types, dell pluvial and colluvial deposits and alluvial deposits, based on the analyses of sedimentation, geomorphology and features of gold placer concentration. Six subtypes can be listed by sub-classification. Gold placers are abundant in this region and the mining history is long. But the search of rock-gold has been very long without findings. Study of the characteristics of the structure, thesurrounding rock and the mother rock of the gold placer mines finds that the mother rocks of the gold lacer deposits are closely related to the local Middle Carboniferous silic and carbonic slate, schist and other light metamorphic rocks. The related formations are probably the original layers of the gold placers. The gold placers are stored in the Middle-Late Pleistocene and Holocene alluvium, pluvium and residium. The neotectonic movement has raised the Qlnghai - Xizang(Tibetan) Plateau very rapidly.The northem Qiangtang Plateau was lifted up to 4500m above sea level and its inland high attitude cold and arid climate was formed before the Middle Pleistocene. On the high plateau, under the condition of low air-temperature and rich ultraviolet radiation, melting snow and ice water contains rich H2O2. Seasonal melting and freezing of surface layer of the frozen ground and melting of snow cover very commonly form a saturated or supersaturated layer just next to the surface. Gold in mother rocks in free from inhibition and transported in H2O2 rich water,later then deposited and concentrated at lower flue-velocity zone. Study of grain size and morphology of particles of the gold placers, field survey and chemical analyses present that the most particles of the gold placers are formed in chemical deposition, and that others are characterized with mechanical transportation. on the other hand,mineralization is obvious in quartz vein in contact metamorphic zone between local carbonic slate(silic slate) and intrusions. As and Sb in the slates show abnormal. Those all mean that findingof rock gold in this region is still in a great possibility. |
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| Keywords: | the gold placers cold and freezing zone of high attitude the East Kunlun Mts Xinjiang |
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