Knowledge Management System Of Guangzhou Institute of Geochemistry，CAS
| Geochronological and geochemical study on the Yulong porphyry copper ore belt in eastern Tibet, China | |
| Liang HY; Zhang YQ; Xie YW; Lin W; Campbell IH; Yu HX | |
| Source Publication | 8th Biennial SGA Meeting |
| 2005-08-18 | |
| Conference Date | 2005-8-18 |
| Conference Place | Beijing, PEOPLES R CHINA |
| Indexed By | SCI |
| Language | 英语 |
| Abstract | The Yulong copper belt, along part of the Red River-Ailao Shan fault system and its northwestern extension in eastern Tibet, consists of five porphyry pipes that contain a total copper resource of over 8 million tons. The porphyries are characterized by high alkali content (K2O+Na2O > 6%), K2O/Na2O > 1, and marked negative Ti, Ta and Nb anomalies on mantle-normalized incompatible element diagrams. U-Th-Pb laser ICP-MS dating of zircons from the Yulong porphyries showed that they were emplaced over a 4.3 Ma period and that they Young systematically from northwest to southeast as follows: Yulong, 41.2 +/- 0.2Ma; Zalaga, 38.5 +/- 0.2Ma; Mangzong, 37.6 +/- 0.2 Ma; Duoxiasongduo, 37.5 +/- 0.2Ma; and Malasongduo, 36.9 +/- 0.4 Ma. We suggest that the source of the shoshonites was lower crust that was pushed into the mantle by the compressive component of transpressional movement on the adjacent Tuoba-Mangkang fault and that the compositional variation in the porphyries is due to mixing between magmas of different composition, generated by different degrees of partial melting of a heterogeneous source region. |
| Document Type | 会议论文 |
| Identifier | http://ir.gig.ac.cn/handle/344008/9396 |
| Collection | 中科院广州地化所(-2008) |
| Recommended Citation GB/T 7714 | Liang HY,Zhang YQ,Xie YW,et al. Geochronological and geochemical study on the Yulong porphyry copper ore belt in eastern Tibet, China[C],2005. |
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