Identification and tectonic significance of the Late Paleozoic Xingshuwa ophiolitic mélange in the Linxi area, Inner Mongolia, China

Bulletin of Mineralogy Petrology and Geochemistry 2026

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Authors: Xiuzhong Fu, Ke Wang, Li Yilong, Guocong Li, Guoqing Wang, Qi Gao, Xuji Guo, Huan-qing GUO, Shaoting Tian, Bing Liu, Guang YANG
DOI: 10.3724/j.issn.1007-2802.20260057
Cited by: 0
References: 79

Abstract

古亚洲洋的闭合时间与过程尚存较大争议。蛇绿岩是恢复大洋演化和识别板块汇聚边界的直接证据。本文对内蒙古林西地区杏树洼蛇绿混杂岩开展了岩石学、年代学和地球化学分析，识别出蛇纹岩、玄武岩、硅质岩和灰岩等岩块以及基质砂岩等组分。其中蛇纹岩的原岩为方辉橄榄岩，形成过程经历了~20%的熔体抽取，后期遭受到俯冲流体的交代。玄武岩的锆石U-Pb定年给出了（283±4）Ma的结晶年龄，包括E-MORB和OIB类型，其母岩浆源自尖晶石-石榴子石二辉橄榄岩的部分熔融。基质砂岩的碎屑锆石U-Pb定年给出265 Ma的最大沉积年龄，其物源主要来自华北北缘的陆缘弧岩浆岩。结合前人研究成果，本文认为古亚洲洋的南向俯冲持续到中三叠世，多种属性的洋壳块体发生构造就位，与沉积物一并拼贴增生到华北北缘，杏树洼蛇绿混杂岩可能代表古亚洲洋最晚的大洋残留。

Fields of Study & Subjects

Geological and Geochemical Analysis Geochemistry and Geochronology of Asian Mineral Deposits Geological and Geophysical Studies

Publication details

Journal / source
Bulletin of Mineralogy Petrology and Geochemistry
Volume
45
Issue
2
Pages
345–362
Publication date
1 March 2026
Language
EN