Paleogene carbonate microfacies and sandstone provenance (Gamba area, South Tibet): Stratigraphic response to initial India-Asia continental collision

doi:10.1016/j.jseaes.2014.10.027

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Paleogene carbonate microfacies and sandstone provenance (Gamba area, South Tibet): Stratigraphic response to initial India-Asia continental collision
	Li, Juan 1; Hu, Xiumian 1; Garzanti, Eduardo 2; An, Wei 1; Wang, Jiangang 3
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2015-05-15
卷号	104 页码:39-54
关键词	Paleogene Carbonate Microfacies Detrital Zircon U-pb-hf Isotopes Bulge Unconformity India-asia Collision South Tibet
DOI	10.1016/j.jseaes.2014.10.027
文献子类	Article
英文摘要	The Paleogene marine strata in the Gamba area of south Tibet comprise carbonates of the Zongpu Formation and siliciclastic rocks of the Enba and Zhaguo Formations, documenting the final stages of marine deposition in the Tethyan Himalaya. The similar to 350-m-thick Zongpu Formation was dated as late Danian to Ypresian based on larger benthic foraminifers. Thirteen distinct microfacies identify three sedimentary environments. Mudstone, wackestone with Udoteacean algae, bioclastic-peloidal packstone, packstone with Rotaliids and green algae, floatstone with Alveolina and Orbitolites were deposited in restricted lagoonal environments. Bioclastic packstone and grainstone with Rotaliids were deposited in high-energy shoal environments. Floatstones with Nummulitids or Alveolinids were deposited in shallow open-marine environments. The Zongpu Formation was accumulated on a carbonate ramp. It documents two deepening-upward sequences separated by an unconformity corresponding to the Palaeocene/Eocene boundary and marked by a conglomerate with limestone clasts. The overlying Enba Formation comprises greenish grey calcareous shales intercalated with litho-quartzose sandstones in the upper part and capped by subaerial litho-quartzose red beds of the Zhaguo Formation. Petrographic analysis, detrital zircon geochronology and Hf isotopic data indicate that detritus in the Enba and Zhaguo Formations, deposited on the Indian passive margin, was derived from the Asian active margin in the north. These clastic units were thus deposited after the onset of the India-Asia continental collision in the early Himalayan foreland basin. Major lithological and paleoenvironmental changes occurred at three stratigraphic levels: the Jidula/Zongpu boundary (similar to 62 Ma), the Paleocene/Eocene boundary (similar to 56 Ma) and the Zongpu/Enba boundary (similar to 51 Ma). Our provenance study confirms that the India-Asia collision was already under way during the deposition of the Enba Member (i.e., by similar to 51 Ma) and, along with facies analysis and general palaeogeographic considerations, indicates that Neo-Tethys was still wide open during the Early-Middle Paleocene. It is thus argued, consistently with previous studies, that the Paleocene/Eocene disconformity documented in the Gamba area as in the northwestern Tethyan Himalaya is likely to record flexural uplift consequent to initial underthrusting of the Indian continental margin beneath Asia at, or just a little earlier than, 56 Ma. (C) 2014 Elsevier Ltd. All rights reserved.
WOS关键词	FORE-ARC BASIN ; ZIRCON U-PB ; YARLUNG ZANGBO OPHIOLITES ; SEDIMENTARY HISTORY ; TECTONIC EVOLUTION ; GANGDESE BATHOLITH ; TETHYS HIMALAYA ; PASSIVE MARGIN ; SUTURE ZONE ; GEOCHRONOLOGY
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000354584000004
资助机构	MOST 973 Project(2012CB822001) ; MOST 973 Project(2012CB822001) ; NSFC Project(41172092) ; NSFC Project(41172092) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB03010106) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB03010106) ; MOST 973 Project(2012CB822001) ; MOST 973 Project(2012CB822001) ; NSFC Project(41172092) ; NSFC Project(41172092) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB03010106) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences(XDB03010106)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62494]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Nanjing Univ, State Key Lab Mineral Deposit Res, Sch Earth Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China 2.Univ Milano Bicocca, Lab Provenance Studies, Dept Earth & Environm Sci, I-20126 Milan, Italy 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Li, Juan,Hu, Xiumian,Garzanti, Eduardo,et al. Paleogene carbonate microfacies and sandstone provenance (Gamba area, South Tibet): Stratigraphic response to initial India-Asia continental collision[J]. JOURNAL OF ASIAN EARTH SCIENCES,2015,104:39-54.
APA	Li, Juan,Hu, Xiumian,Garzanti, Eduardo,An, Wei,&Wang, Jiangang.(2015).Paleogene carbonate microfacies and sandstone provenance (Gamba area, South Tibet): Stratigraphic response to initial India-Asia continental collision.JOURNAL OF ASIAN EARTH SCIENCES,104,39-54.
MLA	Li, Juan,et al."Paleogene carbonate microfacies and sandstone provenance (Gamba area, South Tibet): Stratigraphic response to initial India-Asia continental collision".JOURNAL OF ASIAN EARTH SCIENCES 104(2015):39-54.