Early Triassic Volcanic Rocks in the Western Yarlung Zangbo Suture Zone: Implications for the Opening of the Neo-Tethys Ocean

被引：0
|
作者：
HE Juan [1 ,2 ]
LI Yalin [2 ]
HOU Yunling [3 ]
ZHOU Aorigele [4 ]
WEI Yushuai [2 ]
CHEN Xi [2 ]
DAI Jingen [2 ]
机构：
[1] School of Civil Engineering and Architecture, West Yunnan University of Applied Sciences
[2] School of Earth Sciences and Resources, China University of Geosciences (Beijing)
[3] West Yunnan University of Applied Sciences
[4] MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences
来源：
Acta Geologica Sinica(English Edition) | 2024年 / 98卷 / 02期
基金：
中国国家自然科学基金;
关键词：
D O I：
暂无
中图分类号：
P534.51 [三叠纪（系）]; P588.14 [喷出岩（火山岩）]; P542 [构造运动];
学科分类号：
070901 ; 070903 ; 070904 ;
摘要：
In this study,zircon U-Pb dating of volcanic rocks from the Zhongba ophiolite of the Yarlung Zangbo Suture Zone(YZSZ) in southern Xizang(Tibet) yielded an age of 247 ± 3 Ma.According to whole rock geochemical and Sr-NdPb isotopic data,the Early Triassic samples could be divided into two groups:Group 1 with P-MORB affinity,showing initial87Sr/86Sr ratios of 0.70253-0.70602,εNd(t) values of 4.2-5.3,(206Pb/204Pb)tratios of 16.353-18.222,(207Pb/204Pb)tratios of 15.454-15.564,and(208Pb/204Pb)tratios of 35.665-38.136;Group 2 with OIB affinity,showing initial87Sr/86Sr ratios of 0.70249-0.70513,εNd(t) values of 4.4-4.9,(206Pb/204Pb)tratios of 17.140-18.328,(207Pb/204Pb)tratios of 15.491-15.575,and(208Pb/204Pb)tratios of 36.051-38.247.Group 2 rocks formed by partial melting of the mantle source enriched by a former plume,and assimilated continental crustal material during melt ascension.The formation of Group 1 rocks corresponds to the mixing of OIB melts,with the same components as Group 2 and N-MORBs.The Zhongba Early Triassic rocks belong to the continental margin type ophiolite and formed in the continental-oceanic transition zone during the initial opening of the Neo-Tethys in southern Xizang(Tibet).
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页码：324 / 336
页数：13
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