| 三江地区成矿总结取得初步成果 |
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| 引用本文：周伟勤.1983.三江地区成矿总结取得初步成果[J].地球学报,5(2):131-133. |
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| 中文摘要:<正> 位于青藏高原东部的金沙江、澜沧江、怒江流域——(三江地区)是一个强烈的构造活动带,也是我国一个重要的成矿远景区。为了总结三十多年来的地质工作成果,研究区域成矿条件,1981年地质部成立了“三江专著”编辑委员会,组织了在该区从事实际工作的百余名技术骨干,开展“三江”地区地质工作总结,现已取得初步成果。 一、已完成金沙江、澜沧江、怒江地区“地质志”、“矿产志”的编著工作。第一次编制了一百万分之一三江地区地质图,这是迄令公开出版的最大比例尺的区域性地质图。为进一步开展本区地质研究和国民经济建设提供了一份基础图件。 |
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| PLENTIFUL RESULTS IN SUMMING UP RESEARCH WORK ON WETALLOGENY IN SANJIANG AREA |
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| Abstract:The Sanjiang (the Jjnsha, Lancang and Nujiang Rivers) region on theeastern part of the Qinghai--Xizang (Tibet) Plateau, is one of the importantprospects for metallogeny in China, with a character of intense tectonic activity. In order to sum up the geological findings over the past 30 years,the Ministry of Geology constituted an editorial board for monographs concerning the Sanjiang area in 1981. It has also organized more than a hundred people who are engaged in practical work in this area to summarize thegeological work conducted. Preliminary results have been gained so far. The compilation of the "Memoir of Geology" and the "Memoir of MineralResources" for the Sanjiang area has been completed. The geological map onthe scale of 1:1,000,000 has been prepared. Through the sum-up mentioned above and by analysing critical geologic problems in the field, it is noted that in the Duocai-Yushu, Qinghai andthe Garze-Litang-Wachang, Sichuan occur ultramafic rocks as well as maficcomplex, gabbro, diabase and pillow lava, typical of ocean crustal texture.They have formed ophiolite melange belts due to severe compression, cropping out intermittently. Padiolarian siliceous rocks are also noted in the Litang-Wachang area. All these ophiolites are the remains of oceanic crust ofthe Permian-Triassic ages. This understanding has an important significancein guiding the prospecting work in this area. Four major tectono-metallogenic zones have been divided: Ⅰ.Bomi-Tengchong tin mineralization zone: Rare metal mineralization zone of pegmatitetype occurs both on the east and west sides of the zone, while tin mineralization occurs in the middle and tin deposits have been recognized in morethan ten localities. The stanniferous rock bodies of the Himalayan, high inacidity and rich in potassium,have intruded ioto Carboniferous gravel-bearingslates. The slates have a very high abundance of tin,which is similar to thebelts in west Thailand. Ⅱ.Dengqen-Changning-Lancang iron-tin-polymetallic mineralization zone:The Lancang group of Pre-Ordovician age, exposed in the zone,is represented by a flysch facies with intensely metamorphosed volcanics. The associated sedimentary-metamorphic iron ores are quite widespread. Tin occur-rences and lead-zinc-polymetallic occurrences exist in banded structure andare distributed regularly. The former, closely associated with granite. is anorthern extension of the tin belts of central Malaysia, whereas the latter,associated with volcanics, is rich in silver. Ⅲ. Changdu-Lanping-Simao saline-iron-copper polymetallic mineralization zone: In the northern of this zone occurs the Yulong porphyry copperbelt that is famous in China. It covers an extensive area and contains largedeposits. Big lead-zinc deposits such as the Lanping deposit have alreadybeen discovered in the southern part. This mineralization zone is also a northern extension of the sylvine zone of Thailand. Ⅳ.Yushu-Yidun polymetallic and tin mineralization zone:Here, mineralization is associated with volcanic activities of Late Triassic Epoch andmagmatic activities of Himalayan. Large polymetallic deposits have alreadybeen noted. |
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