青海南祁连东段化隆岩群时代重新厘定及地质意义  

The redefinition of the age of Hualong rock group and geological significance in the eastern segment of the South Qilian Mountains in Qinghai

作　　者：康伟浩 任二峰[1] 高亮[1] KANG Weihao REN Erfeng GAO Liang(Department of Geological Engineering, Qinghai University, The Key Lab of Cenozoic Resource ＆Environment in North Margin of the Tibetan Plateau, Xining 810016, China)

机构地区：[1]青海大学地质工程系,青海省青藏高原北缘新生代资源重点实验室,青海西宁810016

出　　处：《青海大学学报（自然科学版）》2016年第5期52-57,79,共7页Journal of Qinghai University(Natural Science)

基　　金：青海省科技厅项目(2016-ZJ-752);中国地质调查局项目(1212011121196);青海大学“地质资源与地质工程创新团队”项目(4056051201);青海大学博士科研启动经费项目

摘　　要：为了明确化隆岩群的时代,本文利用LA-ICP-MS法对化隆岩群中的黑云斜长片麻岩体进行锆石U-Pb同位素年龄测试,结果表明:在锆石U-Pb年龄谐和图中60个数据集中分布在谐和线上及其附近,上交点年龄为(2 092±29)Ma,下交点年龄为(833±71)Ma,上交点年龄应为成岩年龄。由此得出南祁连化隆岩群的时代应为古元古代。There are different views on the age of the Hualong rock group in the southern Qilian. TheLA - ICP - MS method was adopted for testing zircon U - Pb isotopic age of gneiss body in Hualonggroup of rocks. The results showed that 60 data points of zircon U - Pb age in harmony figure concentratedat harmonic lines vicinity. The upper incept age is （2 092 ± 2 9 ） Ma, and the lower interceptage is （833 ± 7 1 ） Ma. Age should be turned over to the point diagenetic age. The Hualong Groupshould be Paleoproterozoicin in the south Qilian.

关 键 词：黑云斜长片麻岩 LA-ICP-MS 锆石U-PB年龄 化隆岩群 南祁连 

分 类 号：P62[天文地球—地质矿产勘探]