| 西藏东部锡矿远景的初步预测 |
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| 引用本文：.1988.Preliminary prognosis of tin prospects in eastern Tibet[J].Mineral Deposits,7(1):25~31 |
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| 中文摘要:本文根据川西、滇西已发现锡矿床，西藏东部已发现很有远景的锡矿点，结合锡矿成矿的一般规律，论述了该区锡成矿的有利地质因素，指出西藏东部应属东南亚锡矿带的北廷部分，具有良好的成矿前景，并具体划分了几个锡矿成矿远景区，以资西藏找锡工作参考。 |
| 中文关键词:锡矿成矿条件 远景区 西藏东部 |
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| Preliminary prognosis of tin prospects in eastern Tibet |
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| Abstract:At the beginning of 1980s, the Bureau of Geology and Mineral Resources of Xizang started its geological reconnaissance for tin deposits, which led to the discovery of some economic primary tin deposits and tin placer deposits) in addition, a series of tin deposits discovered in western Sichuan and western Yunnan have approximately the same geological conditions as those in eastern Tibet. The authors’ purpose of writing this paper is to put forward their view points’ concerning tin potential in eastern Tibet. Several tin prospects can be recognized in Eastern Tibet 0n the basis of metallogenic conditions for tin deposits: 1．Two ore prospect areas the first area stretches southward from Riwoge county through Zogong, connected probably with the Lancangjiang tin and tungsten belt in Yunnan province, A rich primary tin deposit of stratabound tin-bearing quartz veinlet type which extends at least hundreds of meters at surface has been discovered in Riwoge area. A tin deposit of the same type has been found in Yulong of Yunnan province, and placer deposits have also been detected along the belt. The tin mineralization in this area is safely related to the late Yanshanian “S” type granite. The second belt refers to the placer tin belt from Bangkog, through Lhari, Bowo to Zayu. A rich placer with associated tungsten and gold mineralizations adjacent to the Late Yanshaniau “S” type granite period has been found in Bangkog area, intense greisenization is observed, and heavy mineral samples collected at surface contain cassiterite as high as 3000g/m3. 2．Three favorable areas for prospecting (1) The area located on the western side of the Jinshajiang River. These skarn tin-polymetallic ore deposits have been discovered near eastern side of the Jinshajiang River in Sichuan while a series of skarn polymetallic ore deposits have been detected on the western side of the Jinshajiang River．From the similar geologic conditions of these two sides, it can be inferred that tin deposits might be found on the western side of the Jinshajiang River. (2)The northern slope of the Himalayan mountains, where there exist a series of “S” type granites of Himalayan period.It has been previously said that there occur tin placer deposits in that area. (3)The northern side of the Yarlung Zangbo River, from Nyingchi to Sangri, belonging to an area of “S” type granites. As stated above, there are some favorable conditions for tin prospecting in eastern Tibet: (1)Late Yanshanian “S” type granites are widespread in this area; (2)some primary tin(tungsten)deposits, tin placer deposits and a series of tin placer occurrences have already been discovered; (3)the famous south-eastern Asia tin belt extends northward to western Sichuan and western Yunnan, and this area belongs to the extension part of that belt. It is therefore considered that the tin prospecting in this area is based on solid geological background. |
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