地质通报2012，Vol.31Issue(6)：884-895,12.
豫西西峡地区青岗坪花岗闪长岩LA-ICP-MS锆石U-Pb测年、Hf同位素组成及其地质意义
LA-ICP-MS zircon U-Pb dating and Hf isotope analysis of the Qinggangping granodiorite in Xixia area of western Henan Province and their geological significance
摘要
Abstract
Caledonian granitoids are well developed in western Henan Province. The study of these granites is of great significance for understanding the Erlangping Rock Group and the orogenic process of the North Qinling orogen. This paper presents zircon geochronologic data, zircon Hf isotopic and related whole-rock geochemical analyses of a typical granitoid pluton in Qingangping area of western Henan Province, and gives the following results and understanding: The Qinggangping granitoid pluton in western Henan Province has a crystallization age of 475.212.7 Ma. This age can be used to constrain the emplacement time of Erlangping ophiolite. The Qinggangping granitoids have relatively low MgO, Fe2O3, Cr and Ni content and Mg number. These geochemical characteristics show that the granitoid should be the product of a thickened lower crust by partial melting. It can also be concluded that convergence-collision probably occurred in North Qinling in Early Paleoproterozoic period.关键词
秦岭造山带/二郎坪岩群/LA-ICP-MS锆石U-Pb定年/Lu-Hf同位素Key words
Qinling orogenic belt/ Erlangping Rock Group / LA-ICP-MS zircon U-Pb age/ Lu-Hf isotope分类
天文与地球科学引用本文复制引用
王锦,第五春荣,孙勇,刘晔,王维..豫西西峡地区青岗坪花岗闪长岩LA-ICP-MS锆石U-Pb测年、Hf同位素组成及其地质意义[J].地质通报,2012,31(6):884-895,12.基金项目
国家重点基础研究发展计划项目《陆壳超深俯冲和折返的岩石学记录》(编号:2009CB825003) （编号:2009CB825003）
