地质论评Issue(3)：694-708,15.DOI:10.16509/j.georeview.2015.03.021
滇西北羊拉铜矿床赋矿围岩的时代和物源区特征：锆石 LA-MC-ICP-MS U-Pb 年龄的制约
Detrital Zircon LA-MC-ICP-MS U-Pb Age and Provenance Characteristics of Ore-hosting Rocks in Yangla Copper Deposit,Northwestern Yunnan
摘要
Abstract
To better understand the genesis,the formation age and the tectonic setting of Yangla copper deposit,we aim to obtain the detrital zircon ages of chlorite slate (the ore-hosting rock of KT2 ore body in Linong ore block)by LA-MC-ICP-MS U-Pb dating.The obtained U-Pb geochronological data show that the youngest age of the detrital zircon of chlorite slate is about 306 Ma,and the detrital zircons U-Pb result is mainly concentrated at 345 Ma,429 Ma,1446 Ma,1515 Ma and 1829 Ma.The depositional age of chlorite slate is constrained to later than 345 Ma,suggests the protolith of chlorite slate was deposited in the Carboniferous,shouldn't be thought to be Devonian in age.The highest peak in the histogram of detrital zircons ages is about at 345 Ma,suggests the magmatic event is strongest,and may coincide with the seafloor spreading and initial Jinshajiang ocean basin forming.Carboniferous syn-depositional mineralization related to seabed volcanism is the main metallogenesis of Yangla copper deposit,while stratiform copper ore body are mainly effected by the superimposed reformation with the emplaced of granodiorite at Triassic.In addition,the data of detrital zircon population at 1446 Ma,1515 Ma, 1829 Ma and 2423 Ma suggest that the provenance of the meta-sedimentary rock are mainly derived from the Yangtz Block materials.关键词
绿泥板岩/赋矿围岩/沉积时代/锆石 U-Pb 年龄/羊拉铜矿/滇西北Key words
chlorite slate/ore-hosting rock/depositional age/U-Pb zircon ages/Yangla copper deposit/northwestern Yunnan引用本文复制引用
杨德庭,王彦斌..滇西北羊拉铜矿床赋矿围岩的时代和物源区特征：锆石 LA-MC-ICP-MS U-Pb 年龄的制约[J].地质论评,2015,(3):694-708,15.基金项目
本文为国家重点基础研究发展规划（编号2009CB421001）、国土资源部公益性行业科研专项（编号201011027-1C）和中国地质调查局项目（编号1212011121066）的成果。 （）
