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青藏高原安多高压麻粒岩同位素年代学研究 预览 被引量:4

Xie CM, Li C, Su L, Dong YS, Wu YW and Xie YW. 2013. Geochronology of high-pressure granulite in the Amdo, Qinghai-Tibet Plateau. Acta Petrologica Sinica, 29 ( 3 ) : 912 - 922
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摘要 本文报道了聂荣微陆块中新发现的高压麻粒岩锆石U-Pb定年结果及其围岩花岗片麻岩中黑云母Ar-Ar同位素年代学结果。高压麻粒岩中的锆石可分为两类,第一类具有核-边显微结构,核部残留锆石具典型岩浆结晶锆石特征,锆石U-Pb年龄541±8Ma~834±11Ma;第二类锆石具典型的变质锆石成因的结构特征,锆石U-Pb谐和年龄为179.0±1.7Ma。花岗片麻岩中黑云母Ar-Ar坪年龄为166.7±1.1Ma。年代学资料显示麻粒岩与其围岩均具有泛非期的年龄信息,麻粒岩的原岩经历了晚元古代-早古生代造山作用,并于早-中侏罗世发生了峰期高压变质作用改造,该变质事件可能代表着聂荣微陆块与羌南板块的碰撞拼合。伴随着早-中侏罗世的岩浆作用,麻粒岩及其围岩迅速抬升,抬升的时间跨度在13Myr左右,于166.7Ma左右抬升至地壳浅层部位或近地表。 This paper reports the results of LA-ICP-MS U-Pb dating of the zircon in newly discovered high-pressure granulite, and the Ar-Ar isotopic dating of biotite in granitic gneiss of the surrounding rock of high-pressure granulite on Nyainrong microcontinent. There are two types of zircon in high-pressure granulites, the first type is a core-edge microstructure, the zircon residualed cores with typical features of magmatic zircon, zircon U-Pb age is 541 ± 8Ma - 834 ± lima; the second zircon with typical structural characteristics of the causes metamorphic zircon, zircon U-Pb age is 179. 0± 1.7Ma. In granite gneiss the biotite Ar-Ar plateau age of 166. 7 ± 1.1Ma. Age data show both granulite and its surrounding are with the Pan-African age information, granulite protolith experienced a Late Proterozoic-Early Paleozoic orogeny, and in the Early-Middle Jurassic occurred peak high-pressure metamorphic role in transformation, the metamorphic event may be related to a major role in collision which occurred in Bangong Co-Nujiang River suture zone in region it may represent the Nyainrong microcontinent and Qiangnan plate put together. With the Early-Middle Jurassic magmatism, granulite and its surrounding rapidly exhumation, exhumation of the time span is about 13Myr and at about 166.7Ma uplift to shallow parts of the crust or near the surface.
作者 解超明 李才 苏犁 董永胜 吴彦旺 谢尧武 XIE ChaoMing, LI Cai ,SU Li, DONG YongSheng ,WU YanWang and XIE YaoWu( 1. College of Earth Sciences, Jilin University, Changchun 130061, China 2. The Geological Laboratory Center, China University of Geosciences, Beijing 100083, China 3. Regional Geological Survey Party, Tibet Bureau of Geology and Mineral Exploration and Development, Doilungdegen 851400, China )
出处 《岩石学报》 SCIE CAS CSCD 北大核心 2013年第3期912-922,共11页 Acta Petrologica Sinica
基金 本文受国家自然科学基金项目(41272240、40872146)和中国地质调查局项目(1212011121248、1212011221093)联合资助.
关键词 高压麻粒岩 锆石U-PB定年 40Ar-39Ar测年 聂荣微陆块 青藏高原 High-pressure granulite Zircon U-Pb dating 40Ar-39Ar dating Nyainrong microcontinent Tibetan Plateau
作者简介 解超明,男,1983年生,博士生,构造地质学专业,E—mail:xcmxcml983@126.com 通讯作者:李才,男,教授,博士生导师,从事青藏高原大地构造与区域地质研究,E—mail:licai010@126.com
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