Oligo-Miocene shearing along the Ailao Shan-Red River shear zone: Constraints from structural analysis and zircon U/Pb geochronology of magmatic rocks in the Diancang Shan massif, SE Tibet, China

被引：211

作者：

Cao, Shuyun ^{[1
,2
]}

Liu, Junlai ^{[1
]}

Leiss, Bernd ^{[2
]}

Neubauer, Franz ^{[3
]}

Genser, Johann ^{[3
]}

Zhao, Chunqiang ^{[1
]}

机构：

[1] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Beijing 100083, Peoples R China

[2] Univ Gottingen, Geosci Ctr, D-37077 Gottingen, Germany

[3] Salzburg Univ, Dept Geog & Geol, A-5020 Salzburg, Austria

来源：

GONDWANA RESEARCH | 2011年 / 19卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Zircon U/Pb geochronology; Timing of shearing; Microstructural analysis; Diancang Shan massif; Ailao Shan-Red River shear zone; 40AR/39AR DATING CONSTRAINT; HIMALAYAN FORELAND BASIN; GONDWANA-DERIVED BLOCKS; ALKALINE IGNEOUS ROCKS; DEEP-SEATED MAGMATISM; LEFT-LATERAL MOVEMENT; INDIA-ASIA COLLISION; NAM-DINH AREA; U-PB AGES; STRIKE-SLIP;

D O I：

10.1016/j.gr.2010.10.006

中图分类号：

P [天文学、地球科学];

学科分类号：

070403 [天体物理学];

摘要：

The left-lateral strike-slip shearing along the Ailao Shan-Red River (ASRR) shear zone in the Southeastern Tibet, China, has been widely advocated to be a result of the Indian-Eurasian plate collision and post-collisional processes. The Diancang Shan (DCS) massif, which occurs at the northwestern extension of the Ailao Shan massif, is a typical high-grade metamorphic complex aligned along the ASRR tectonic belt. Structural and microstructural analysis of the plutonic intrusions in the DCS revealed different types of granitic intrusions spatially confined to the shear zone and temporally related to the left-lateral shearing along the ASRR shear zone in the DCS massif. The combined structural and geochronological results of SHRIMP-II and LA-ICP-MS zircon U/Pb isotopic dating have revealed successive magmatic intrusions and crystallization related to the Oligo-Miocene shearing in the DCS massif. The pre-, early- and syn-kinematic emplacements are linked to regional high-temperature deformation (lower amphibolite facies) at relatively deep crustal levels. The zircon U/Pb geochronological results suggest that the left-lateral ductile shearing along the ASRR shear zone was initiated at ca. 31 Ma, culminated between ca. 27 and 21 Ma resulting in high-temperature metamorphic conditions and slowed down at ca. 20 Ma at relatively low-temperatures. Crown Copyright (C) 2010 Published by Elsevier B.V. on behalf of International Association for Gondwana Research. All rights reserved.

引用

页码：975 / 993

页数：19

共 121 条

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