地球科学进展 >
2016 , Vol. 31 >Issue 4: 391 - 402
DOI: https://doi.org/10.11867/j.issn.1001-8166.2016.04.0391.
喜马拉雅早古生代岩浆事件:以吉隆和聂拉木眼球状片麻岩为例
作者简介:王晓先(1986-),男,山东青岛人,助理研究员,主要从事构造地质研究.E-mail:xiaoxianwang@pku.edu.cn
收稿日期: 2016-01-18
修回日期: 2016-03-15
网络出版日期: 2016-04-10
基金资助
中国地震局地壳应力研究所中央级公益性科研院所基本科研业务专项项目“红河断裂带北段新生代构造活动历史研究”(编号:ZDJ2014-09);国家自然科学基金项目“藏南佩枯错片麻岩穹窿变形—变质作用及形成演化研究”(编号:41402175)资助
版权
Early Paleozoic Magmatism in Himalayan Orogen: The Geochronological Study on Augen Gneisses from Gyirongand Nyalam Areas, Southern Tibet
First author:Wang Xiaoxian (1986-), male, Qingdao City, Shandong Province, Research Assistant. Research areas include structural geology and tectonics.E-mail:xiaoxianwang@pku.edu.cn
Received date: 2016-01-18
Revised date: 2016-03-15
Online published: 2016-04-10
Supported by
Project supported by the Research Grant from Institute of Crustal Dynamics, China Earthquake Administration “Study on the tectonic activity of northern segment of Red River fault zone”(No.ZDJ2014-09);The National Natural Science Foundation of China “Structural deformation, metamorphism and tectonic evolution of Paiku Co gneiss dome, south Tibet”(No.41402175)
Copyright
喜马拉雅造山带中段的吉隆和聂拉木地区出露一套眼球状片麻岩,其矿物组成为石英、钾长石、斜长石、黑云母和少量的白云母。片麻岩中锆石发育典型的岩浆韵律环带,LA-ICP-MS锆石U-Pb测年显示,2件样品中岩浆锆石的加权平均年龄分别为(488.5±1.1) Ma,(475.1±0.7) Ma和(468.1±2.5) Ma,代表研究区早古生代早期的岩浆作用。现有的早古生代地质记录表明,喜马拉雅地体存在早古生代造山事件,这一事件可与青藏高原南部和东南部的拉萨、羌塘、保山和腾冲地体内同一时代的构造热事件对比,指示区域早古生代造山作用。早古生代早期的造山作用是冈瓦纳大陆聚合之后,原特提斯洋岩石圈沿冈瓦纳大陆北缘俯冲调整的安第斯型造山作用的产物,而非超大陆内部块体拼合过程中陆—陆碰撞为主要特征的泛非造山作用。
王晓先 , 张进江 , 王佳敏 . 喜马拉雅早古生代岩浆事件:以吉隆和聂拉木眼球状片麻岩为例[J]. 地球科学进展, 2016 , 31(4) : 391 -402 . DOI: 10.11867/j.issn.1001-8166.2016.04.0391.
In the Gyirong and Nyalam areas, a massive amount of augen gneisses are extensively exposed in the middle Himalayan orogen. They consist of quartz, K-feldspar, plagioclase, biotite and minor muscovite. Zircons from augen gneisses have magmatic rims indicated by concentric oscillatory zoning. LA-ICP-MS zircon U-Pb dating gave weighted mean ages of (488.5±1.1) Ma (MSWD=0.6)、(475.1±0.7) Ma (MSWD=1.5) and (468.1±2.5) Ma (MSWD=4.2), hinting early Paleozoic magmatism in the Greater Himalayan Crystalline complex (GHC). The data in this study and other published geochronological results of Cambrian-Ordovician magmatites demonstrated that early Paleozoic orogenesis existed in the Himalayas. Early Paleozoic tectonic events preserved in Himalayas are well compared with the contemporaneous ones in the Lhasa terrane, Qiangtang terrane, Baoshan terrane and Tengchong terrane located in the south and southeast of Tibet Plateau. Integrating previous studies, we suggested an Andean-type orogeny corresponding to dynamic adjusting of the plates by subduction of the Proto-Tethys Ocean lithosphere along the northern margin of Gondwana, instead of Pan-African orogeny that was characterized by the continent-continent collisions during Gondwana assembly.
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