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| The Distribution of Phosphorous in Various Types of Pegmatites from Altai, Xinjiang and Its Implication |
| LV Zheng-hang1, ZHANG Hui1, TANG Yong1, ZHAO Jing-yu2, LIU Yun-long1, GUO Liu1 |
1. Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China;
2. Suzhou University, Suzhou Anhui 234000, China |
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Abstract The Xinjiang Altai is an important area of rare metal resources which are going to be exhausted because of the long-term exploitation and the limitation of traditional geophysical methods for prospecting rare metal ore deposits. Thus, it is urgently required to innovate exploration method and make breakthrough in exploration of rare metal resources. Previous studies suggest that prealuminous rocks with mineralization of rare metal are commonly characterized with high P content. The analyses of P2O5 contents in alkaline feldspars from four types of pegmatites by using EPMA and the statistics on P contents in pegmatites have been conducted in this work, in order to verify the prospecting indicators proposed by previous studies and outline prospecting target. The results demonstrate that the barren pegmatites are characterized with low P contents (P2O5<0.1%), whereas the mineralized pegmatites are characterized with high P contents (P2O5 ≥ 0.1%). Therefore, this work supports that the P2O5>0.1% of alkaline feldspar is an effective indicator for prospecting rare metal ore deposits of pegmatite. It is noticed that P contents of the Permian mineralized pegmatites are generally lower than those of the Triassic mineralized pegmatites, we suggest that the Permian pegmatites have relatively low potential for finding rare metal resources. As the Triassic pegmatites in the Halong-Qinghe subzone commonly have high P contents, it is suggested that the rare metal exploration should be concentrated in a target area from the Keketuohai to the upstream of the Kalaeerqisi river in the Xinjiang Altai.
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