气候变化领域集成服务门户(CCPortal): Late Triassic paleolatitude of the Qiangtang block: Implications for the closure of the Paleo-Tethys Ocean

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DOI	10.1016/j.epsl.2015.05.020
	Late Triassic paleolatitude of the Qiangtang block: Implications for the closure of the Paleo-Tethys Ocean
	Song, Peiping; Ding, Lin; Li, Zhenyu; Lippert, Peter C.; Yang, Tianshui; Zhao, Xixi; Fu, Jiajun; Yue, Yahui
通讯作者	Song, PP (通讯作者)
发表日期	2015
ISSN	0012-821X
EISSN	1385-013X
起始页码	69
结束页码	83
卷号	424
英文摘要	To better constrain the Late Triassic paleolatitude of the Qiangtang block and the closure of the Paleo-Tethys Ocean, a combined paleomagnetic and zircon U/Pb geochronological study has been conducted on the Upper Triassic Jiapila Formation volcanic rocks on the northern edge of the Qiangtang block of Central Tibet (34.1 degrees N, 92.4 degrees E). These rocks are dated to 204-213 Ma. Progressive thermal or alternating field demagnetization successfully isolated stable characteristic remanent magnetizations (ChRM) that pass both the fold and reversal tests, consistent with a primary magnetization. These are the first volcanic-based paleomagnetic results from pre-Cretaceous rocks of the Qiangtang block that appear to average secular variation well enough to yield a reliable paleolatitude estimate. Based on our new paleomagnetic data from Upper Triassic lavas, we conclude that the Late Triassic pole of the Qiangtang block was located at 64.0 degrees N, 174.7 degrees E, with A(95) = 6.6 degrees (N = 29). We compile published paleomagnetic data from the Qiangtang block to calculate a Late Triassic latitude for the Qiangtang block at 31.7 +/- 3.0 degrees N. The central Paleo-Tethys Ocean basin was located between the North China (NCB) and Tarim blocks to the north and the Qiangtang block to the south during Late Paleozoic-Early Mesozoic. A comparison of published Early Triassic paleopole from the Qiangtang block with the coeval paleopoles from the NCB and Tarim indicates that the Paleo-Tethys Ocean could not have closed during the Early Triassic and that its width was approximately similar to 32-38 degrees latitude (similar to 3500-4200 km). However, the comparison of our new combined Late Triassic paleomagnetic result with the Late Triassic poles of the NCB and Tarim, as well as numerous geological observations, indicates that the closure of the Paleo-Tethys Ocean at the longitude of the Qiangtang block most likely occurred during the Late Triassic. (C) 2015 Elsevier B.V. All rights reserved.
关键词	NORTHERN TIBET IMPLICATIONS SOUTH CHINA COLLISION TECTONIC EVOLUTION VOLCANIC-ROCKS FOLD TEST PALEOMAGNETIC CONSTRAINTS CENTRAL-ASIA MIDDLE PROVENANCE RECORD
英文关键词	paleomagnetism; U/Pb geochronology; Upper Triassic volcanic rock; paleolatitude; Qiangtang; Paleo-Tethys
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000357223300007
来源期刊	EARTH AND PLANETARY SCIENCE LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258597
推荐引用方式 GB/T 7714	Song, Peiping,Ding, Lin,Li, Zhenyu,et al. Late Triassic paleolatitude of the Qiangtang block: Implications for the closure of the Paleo-Tethys Ocean[J]. 中国科学院青藏高原研究所,2015,424.
APA	Song, Peiping.,Ding, Lin.,Li, Zhenyu.,Lippert, Peter C..,Yang, Tianshui.,...&Yue, Yahui.(2015).Late Triassic paleolatitude of the Qiangtang block: Implications for the closure of the Paleo-Tethys Ocean.EARTH AND PLANETARY SCIENCE LETTERS,424.
MLA	Song, Peiping,et al."Late Triassic paleolatitude of the Qiangtang block: Implications for the closure of the Paleo-Tethys Ocean".EARTH AND PLANETARY SCIENCE LETTERS 424(2015).