Geochronological and geochemical study on the Yulong porphyry copper ore belt in eastern Tibet, China

CORC > 广州地球化学研究所 > 中国科学院广州地球化学研究所 > 中科院广州地化所(-2008)

	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
	2005-08-18
会议日期	2005-8-18
会议地点	Beijing, PEOPLES R CHINA
英文摘要	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.
会议录	8th Biennial SGA Meeting
语种	英语
内容类型	会议论文
源URL	[http://210.77.94.230:8080/handle/344008/9397]
专题	广州地球化学研究所_中科院广州地化所(-2008)
推荐引用方式 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]. 见:. Beijing, PEOPLES R CHINA. 2005-8-18.