Provenance and paleogeography of the Late Cretaceous Mengyejing Formation, Simao Basin, southeastern Tibetan Plateau: Whole-rock geochemistry, U-Pb geochronology, and Hf isotopic constraints

doi:10.1016/j.sedgeo.2014.02.003

	Provenance and paleogeography of the Late Cretaceous Mengyejing Formation, Simao Basin, southeastern Tibetan Plateau: Whole-rock geochemistry, U-Pb geochronology, and Hf isotopic constraints
	Wang, Licheng 3; Liu, Chenglin ; Gao, Xiang 1; Zhang, Hua
刊名	SEDIMENTARY GEOLOGY
	2014
卷号	304 页码:44-58
关键词	Provenance Geochemistry U-Pb detrital zircon age Hf isotope Cretaceous Simao Basin
ISSN号	0037-0738
DOI	10.1016/j.sedgeo.2014.02.003
英文摘要	The Late Cretaceous Mengyejing Formation, which contains the only pre-Quaternary potash salt deposit in the Simao Basin, southeastern Tibet, is thought to be genetically related to the Maha Sarakham Formation in the Khorat Basin. The provenance and paleogeography of these two basins have been under debate, although little diagnostic evidence has been previously published. A combined analysis of whole rock geochemistry, zircon U-Pb chronology, and Hf isotopic compositions was performed to characterize the provenance of the Mengyejing Formation. These formation's sandstones are characterized by moderate chemical index of alteration (CIA) values. These values, together with plots of the Th/U-Th ratios, suggest that certain samples have undergone moderate weathering and sedimentary recycling. The major and trace elements (La/Th-Hf, Th/Sc-Zr/Sc, Eu/Eu*-Th/Sc, TiO2-Fe2O3T + MgO, Al2O3/SiO2-Fe2O3T + MgO, K2O/Na2O-SiO2) indicate that the sedimentary sources were felsic rocks from an active continental margin or continental arc with a minor amount of recycled sediment from a passive continental margin. The Mengyejing Formation contains detrital zircons primarily with U-Pb ages of 2.45-2.57 Ga, 1.8-1.9 Ga, 740-880 Ma, 410-470 Ma, and 215-300 Ma. The results reveal that the pre-Devonian zircons are derived from the recycled sediments of the Yangtze block originating in the Qinling Orogenic Belt, and they share this provenance with the coeval sediments in the Khorat Basin. The magmatic rocks of the Ailaoshan and Lincang areas are responsible for supplying the Devonian to Triassic detrital zircons. These provenance data combined with published paleocurrent results suggest that the Simao Basin was situated on the western margin of the Khorat Basin during the Late Cretaceous. The basins were connected when marine incursion occurred. We propose that pre-Devonian materials from the southwestern Sichuan Basin first supplied detritus to the Simao Basin and subsequently to the Khorat Basin. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	地层学与地史学
WOS关键词	SOUTHERN LANCANGJIANG ZONE ; PLASMA-MASS SPECTROMETRY ; ARC/BACK-ARC ASSEMBLAGES ; PALEO-TETHYS OROGEN ; RED-BED SEQUENCES ; COLLECTOR ICP-MS ; TECTONIC EVOLUTION ; TRACE-ELEMENT ; SW CHINA ; CRUSTAL EVOLUTION
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000335205500004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40381]
专题	中国地质科学院
作者单位	1.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China 2.China Univ Geosci, Inst Earth Sci, Beijing 100083, Peoples R China 3.中国地质科学院矿产资源研究所
推荐引用方式 GB/T 7714	Wang, Licheng,Liu, Chenglin,Gao, Xiang,et al. Provenance and paleogeography of the Late Cretaceous Mengyejing Formation, Simao Basin, southeastern Tibetan Plateau: Whole-rock geochemistry, U-Pb geochronology, and Hf isotopic constraints[J]. SEDIMENTARY GEOLOGY,2014,304:44-58.
APA	Wang, Licheng,Liu, Chenglin,Gao, Xiang,&Zhang, Hua.(2014).Provenance and paleogeography of the Late Cretaceous Mengyejing Formation, Simao Basin, southeastern Tibetan Plateau: Whole-rock geochemistry, U-Pb geochronology, and Hf isotopic constraints.SEDIMENTARY GEOLOGY,304,44-58.
MLA	Wang, Licheng,et al."Provenance and paleogeography of the Late Cretaceous Mengyejing Formation, Simao Basin, southeastern Tibetan Plateau: Whole-rock geochemistry, U-Pb geochronology, and Hf isotopic constraints".SEDIMENTARY GEOLOGY 304(2014):44-58.