中国地质Issue(1):118-133,16.
西藏措勤尼雄矿田日阿铜多金属矿床岩浆活动时代及成因
Geochronology and genesis of the magmatism in the Ri’a copper polymetallic deposit of the Nixiong orefield, Coqen, Tibet
摘要
Abstract
The Ri’a copper-polymetallic deposit, as a typical representative copper metallogenesis of the Nixiong orefield and an <br> important part of Cuoqin-Shenzha iron-copper metallogenetic belt, is located in the middle north of Gangdise. The authors analyzed the mineral composition, major elements, trace elements, and U-Th-Pb composition of zircon from biotite granite associated with copper mineralization in the Ri’a copper polymetallic deposit by LA-ICP-MS. The results show that the biotite granite has typical characteristics of I-type granite, belongs to shoshonite series and must have originated from a crustal-mantle provenance. Zircon U-Th-Pb dating yielded 206Pb/238U age of(89.9±1.6)Ma, which is consistent with the age of mafic intrusive in the Ri’a copper-polymetallic deposit. Combined with the results of previous studies, the authors hold that the bimodal magmatism of Early Late Cretaceous was closely related to mineralization of the Ri’a copper-polymetallic deposit. In consideration of the tectonic environment, the authors propose that the magmatism was controlled by the subduction of both Bangong Co-Nujiang ocean crust and Brahmaputra ocean crust.关键词
关/键/字:锆石U-Pb/LA-ICP-MS/时代与成因/岩浆活动/日阿铜矿/尼雄矿田/西藏Key words
zircon U-Pb/LA-ICP-MS/geochronology and genesis/magmatism/Ri’a copper deposit/Nixiong Orefield/Tibet分类
天文与地球科学引用本文复制引用
于玉帅,杨竹森,戴平云,田世洪,高原,刘英超,修迪..西藏措勤尼雄矿田日阿铜多金属矿床岩浆活动时代及成因[J].中国地质,2015,(1):118-133,16.基金项目
国家重点基础研究发展计划973项目(2011CB403100和2009CB421007)、中国地质调查局地质调查项目(1212010918014和12120114047001)、东华理工大学核资源与环境教育部重点实验室开放基金项目(NRE1206)联合资助。 ()