GIG OpenIR  > 中科院广州地化所(-2008)  > 会议论文
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 Publication8th Biennial SGA Meeting
2005-08-18
Conference Date2005-8-18
Conference PlaceBeijing, PEOPLES R CHINA
Indexed BySCI
Language英语
AbstractThe 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
Identifierhttp://ir.gig.ac.cn/handle/344008/9396
Collection中科院广州地化所(-2008)_会议论文
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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