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DOI	10.1016/j.epsl.2016.11.035
	Large southward motion and clockwise rotation of Indochina throughout the Mesozoic: Paleomagnetic and detrital zircon U-Pb geochronological constraints
	Yan, Yonggang; Huang, Baochun; Zhao, Jie; Zhang, Donghai; Liu, Xiaohui; Charusiri, Punya; Veeravinantanakul, Apivut
通讯作者	Huang, BC (通讯作者)
发表日期	2017
ISSN	0012-821X
EISSN	1385-013X
起始页码	264
结束页码	278
卷号	459
英文摘要	We report a combined paleomagnetic and U-Pb geochronologic study of sedimentary rocks from the Huai Hin Lat and Nam Phong formations of Mesozoic age in NE Thailand in order to provide independent constraints on the tectonic movement of the Indochina Block during convergence of the major blocks now comprising East Asia. The maximum allowable depositional age of the two formations is estimated to be 227 Ma and 215 Ma, respectively, from detrital zircon U-Pb geochronologic analysis which also indicates a sediment source transition in the Khorat Plateau Basin during the Middle-Late Jurassic. A formation mean paleomagnetic direction of D-g/I-g = 21.4 degrees/38.1 degrees(k(g) =19.5, alpha(95) = 9.6 degrees) before and D-s/I-s = 43.0 degrees /48.0 degrees (k(s) = 47.4, alpha(95) = 6.1 degrees, N = 13) after tilt correction is derived from samples with different lithologies, bedding attitudes, magnetic carriers and polarities and yields a positive fold test. Hence, the magnetization is likely primary. The revised Mesozoic APWP of the Indochina Block yields paleolatitudes (for a reference site of 22 degrees N, 102 degrees E) of 33.4 +/- 7.2 N during the Norian Late Triassic, 25.9 +/- 5.9 N during the Late Triassic to Early Jurassic, 23.9 +/- 8 N during the Late Jurassic to Early Cretaceous, 27.5 3.2 N during the Early Cretaceous and 24.5 +/- 4.9 N by the Late Cretaceous; corresponding declinations are 45.2 +/- 8.6, 38.0 +/- 6.6, 36.3 +/- 8.8, 29.6 +/- 3.6 and 24.9 +/- 5.4 respectively. These data indicate a significantly southward displacement accompanied by clockwise rotation during the Mesozoic. A reconstruction of the Indochina Block within the now well -studied merging process of South China and North China indicates that the Indochina Block was located at a higher latitude than the South China Block during the Norian stage of Late Triassic times whilst no significant relative poleward displacement apparently occurred during the Early Jurassic to Early Cretaceous interval. Our study supports a post -Cretaceous tectonic extrusion model with a southeastward displacement of Indochina with respect to the South China Block estimated to be 1000 +/- 850 km since the Late Cretaceous. (C) 2016 Elsevier B.V. All rights reserved.
关键词	POLAR WANDER PATH SONGPAN-GANZI COMPLEX RIVER SHEAR ZONE TECTONIC IMPLICATIONS NORTHERN THAILAND KHORAT GROUP FOLD TEST SE ASIA GEOLOGICAL EVOLUTION INDOSINIAN OROGENY
英文关键词	paleomagnetism; U-Pb geochronology; Indochina; Mesozoic; Tectonics
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000393006500025
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/259070
推荐引用方式 GB/T 7714	Yan, Yonggang,Huang, Baochun,Zhao, Jie,et al. Large southward motion and clockwise rotation of Indochina throughout the Mesozoic: Paleomagnetic and detrital zircon U-Pb geochronological constraints[J]. 中国科学院青藏高原研究所,2017,459.
APA	Yan, Yonggang.,Huang, Baochun.,Zhao, Jie.,Zhang, Donghai.,Liu, Xiaohui.,...&Veeravinantanakul, Apivut.(2017).Large southward motion and clockwise rotation of Indochina throughout the Mesozoic: Paleomagnetic and detrital zircon U-Pb geochronological constraints.EARTH AND PLANETARY SCIENCE LETTERS,459.
MLA	Yan, Yonggang,et al."Large southward motion and clockwise rotation of Indochina throughout the Mesozoic: Paleomagnetic and detrital zircon U-Pb geochronological constraints".EARTH AND PLANETARY SCIENCE LETTERS 459(2017).