Eocene Rotation of the Northeastern Central Tibetan Plateau Indicating Stepwise Compressions and Eastward Extrusions

被引：55

作者：

Zhang, Weilin ^{[1
,2
]}

Fang, Xiaomin ^{[1
,2
]}

Zhang, Tao ^{[1
]}

Song, Chunhui ^{[3
,4
]}

Yan, Maodu ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China

[2] Chinese Acad Sci, Inst Tibetan Plateau Res, CAS Key Lab Continental Collis & Plateau Uplift, Beijing, Peoples R China

[3] Lanzhou Univ, Sch Earth Sci, Lanzhou, Peoples R China

[4] Lanzhou Univ, Key Lab Western Chinas Mineral Resources Gansu Pr, Lanzhou, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2020年 / 47卷 / 17期

基金：

中国国家自然科学基金;

关键词：

Magnetostratigraphy</AUTHOR_KEYWORD>; Paleomagnetic rotation</AUTHOR_KEYWORD>; Nangqian Basin</AUTHOR_KEYWORD>; northeastern central Tibetan Plateau</AUTHOR_KEYWORD>; compression and extrusion</AUTHOR_KEYWORD>; ALTYN-TAGH FAULT; HOH XIL BASIN; RIVER SHEAR ZONE; SOUTHERN TIBET; EASTERN TIBET; CONTINENTAL-COLLISION; MANTLE SUBDUCTION; TECTONIC HISTORY; VOLCANIC-ROCKS; NORTH TIBET;

D O I：

10.1029/2020GL088989

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：

When and how the TP underwent uplift and deformation are still under heated debate. We present paleomagnetic evidence for the NB in the northeastern central TP to help decipher the potential plateau deformation mechanism. Magnetostratigraphy with zircon U-Pb age of volcanic rock demonstrates that the NB basin deposited during 52.5-35.0 Ma. Paleomagnetic declinations indicate that the basin experienced counterclockwise rotation of 25.9 +/- 7.2 degrees during 52-46 Ma and clockwise rotation of 24.4 +/- 9.7 degrees during 41-35 Ma, which coexisted with the intrusion and explosion of volcanic rocks at 51-46 and 39-35 Ma. We proposed a stepwise compression and extrusion model to interpret the basin deposition, rotation, and volcanism by northward compression and eastward extrusion of the eastern Lhasa and Qiangtang Blocks (Proto-TP) in relation to the Sichuan Basin as early response to the India-Asia collision.

引用

页数：14

共 133 条

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