New evidences for sedimentary attributes and timing of the "Macaoyuan;conglomerates" on the northern margin of the Yangtze block in southern;China

doi:10.1016/j.precamres.2013.06.003

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	New evidences for sedimentary attributes and timing of the "Macaoyuan;conglomerates" on the northern margin of the Yangtze block in southern;China
	Wang, Jian 8; Deng, Qi ; Wang, Zheng-jiang ; Qiu, Yan-sheng ; Duan, Tai-zhong ; Jiang, Xin-sheng ; Yang, Qing-xiong
刊名	PRECAMBRIAN RESEARCH
	2013
卷号	235 页码:58-70
关键词	Macaoyuan conglomerates Proterozoic Sedimentary fades Zircon U-Pb age Northern margin of the Yangtze block Southern China
ISSN号	0301-9268;EI 1872-7433
DOI	10.1016/j.precamres.2013.06.003
英文摘要	Recent field geological investigations and sedimentary fades analysis have disclosed that the "Macaoyuan conglomerates" should be assigned to the dolomitized intraclastic lime grainstones rather than the basal conglomerates as previously reported. The conglomerates display depositionally-erosional conformable contacts with their underlying stratigraphic succession. There is no so-called "angular unconformity" or associated "Shennong movement" between the Macaoyuan Group and Shennongjia Group. The Macaoyuan Group consists primarily of carbonate platform facies association and mixed clastic and carbonate shelf facies association, while the "Macaoyuan conglomerates" are mainly made up of carbonate platform slope-channel gravity flow deposits. The sedimentary structures such as basal scouring structures, slump-convolute structures, imbricate structures, inverse grading bedding and lenticular filling deposits are well developed in the slope-channel gravity flow sedimentary succession, whereas cross bedding, wavy bedding, parallel bedding, ripple bedding, and normal grading bedding are common in the mixed inner shelf and platform-margin shoal sedimentary succession. The SHRIMP and LA-ICP-MS zircon age dating techniques are employed for the synsedimentary tuff sample collected from the upper part and sedimentary detrital zircons from the topmost part of the Baliya Formation in the lower part of the Macaoyuan Group. The synsedimentary tuff sample gives a SHRIMP zircon U-Pb age of 1157 +/- 19 Ma, which agrees well with the maximum depositional age of 1180 Ma for the sedimentary detrital zircons. It follows that the age of deposition of the Macaoyuan Group should be traced back to the Mesoproterozoic rather than the Neoproterozoic. The ages of the detrital zircons are mainly concentrated in two time intervals: 1.16-1.26 Ga and 2.60-2.95 Ga. The ca. 2.60 Ga as a marked peak age may represent an important period for the crustal accretion and evolution of the Yangtze block. (C) 2013 Elsevier B.V. All rights reserved.
学科主题	沉积学与沉积岩
WOS关键词	ZIRCON U-PB ; LA-ICP-MS ; TECTONIC SIGNIFICANCE ; CATHAYSIA BLOCKS ; VOLCANIC-ROCKS ; TRACE-ELEMENTS ; GEOCHRONOLOGY ; CRATON ; GEOCHEMISTRY ; PROVENANCE
WOS研究方向	Geology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000328522400004
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39974]
专题	中国地质调查局成都地质调查中心
作者单位	1.[Wang, Jian 2.Deng, Qi 3.Wang, Zheng-jiang 4.China Geol Survey, Chengdu Ctr, Chengdu 610081, Sichuan, Peoples R China. 5.[Qiu, Yan-sheng 6.Hubei Geol Survey, Wuhan 430034, Hubei, Peoples R China. 7.Marathon Oil Co, Houston, TX 77056 USA. 8.中国地质调查局成都地质调查中心
推荐引用方式 GB/T 7714	Wang, Jian,Deng, Qi,Wang, Zheng-jiang,et al. New evidences for sedimentary attributes and timing of the "Macaoyuan;conglomerates" on the northern margin of the Yangtze block in southern;China[J]. PRECAMBRIAN RESEARCH,2013,235:58-70.
APA	Wang, Jian.,Deng, Qi.,Wang, Zheng-jiang.,Qiu, Yan-sheng.,Duan, Tai-zhong.,...&Yang, Qing-xiong.(2013).New evidences for sedimentary attributes and timing of the "Macaoyuan;conglomerates" on the northern margin of the Yangtze block in southern;China.PRECAMBRIAN RESEARCH,235,58-70.
MLA	Wang, Jian,et al."New evidences for sedimentary attributes and timing of the "Macaoyuan;conglomerates" on the northern margin of the Yangtze block in southern;China".PRECAMBRIAN RESEARCH 235(2013):58-70.