地质通报2017，Vol.36Issue(5)：691-697,7.
四川攀西地区层状基性-超基性岩体SHRIMP锆石U-Pb年龄及其地质意义
Zircon SHRIMP U-Pb age of the layered mafic rock mass in Panxi area, Sichuan Province, and its geological significance
摘要
Abstract
In this paper, based on the application of SHRIMP zircon U-Pb dating method, the authors studied the age of the ore-containing layered basic-ultrabasic rocks in western Panzhihua area, with the U-Pb ages of zircons from the Baima layered gabbro body being 258±2Ma (95%confidence) and those of zircons from the Taihe layered gabbro body being 262±2Ma (95%confidence). These data show that both Baima and Taihe ore-bearing gabbros in western Panzihua metallognetic belt were formed in Late Perm?ian. The age information also suggests that the time gap between the intrusion of the layered gabbro body and the eruption of the Emeishan basalt (peak at 250Ma) was only about 5~10Ma, and both the intrusive rocks and the basalts should have resulted from mag?matic activities at different stages. Considering the spatial relationship between the layered gabbro body and the Emeishan basalt and consulting the above age dating results, it is suggested that both the mafic ultramafic rocks and the basalts were formed at the end of the late Paleozoic period and associated with the Emei mantle plume activity.关键词
攀西地区/峨眉地幔柱/基性-超基性岩体/SHRIMP锆石U-Pb定年/白马和太和层状侵入体Key words
Panxi area/Emei mantle plume/mafic ultramafic rock/SHRIMP zircon U-Pb dating/Baima and Taihe layered intrusive body分类
天文与地球科学引用本文复制引用
李华芹,王登红,任海涛,王晓地,贾小辉,杨文强,王磊..四川攀西地区层状基性-超基性岩体SHRIMP锆石U-Pb年龄及其地质意义[J].地质通报,2017,36(5):691-697,7.基金项目
中国地质调查局项目《中国矿产地质与区域成矿规律综合研究(中国矿产地质志)》(编号:1212011220369)和《全国重要矿产和区域成矿规律研究》(编号:1212010633903) （中国矿产地质志）
