Petrography and zircon U-Pb isotopic study of the Bayanwulashan Complex: Constrains on the Paleoproterozoic evolution of the Alxa Block, westernmost North China Craton

doi:10.1016/j.jseaes.2014.05.011

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质科学院矿产资源研究所

	Petrography and zircon U-Pb isotopic study of the Bayanwulashan Complex: Constrains on the Paleoproterozoic evolution of the Alxa Block, westernmost North China Craton
	Wu, Sujuan 1; Hu, Jianmin 1; Ren, Minghua 2; Gong, Wangbin 1; Liu, Yang 3; Yan, Jiyuan 4
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2014
卷号	94 页码:226-239
关键词	Alxa Block North China Craton U-Pb zircon age Paleoproterozoic Petrography
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2014.05.011
英文摘要	The Bayanwulashan Metamorphic Complex (BMC) exposes along the eastern margin of the Alxa Block, the westernmost part of the North China Craton (NCC). BMC is principally composed of metamorphic rocks with amphibole plagiogneiss, biotite plagioclase gneiss and granitic gneiss. Our research has been focused on the petrography and zircon U-Pb geochronology of the BMC to better understand the evolution of the Alxa Block and its relationship with the NCC. Evidences from field geology, petrography, and mineral chemistry indicate that two distinct metamorphic assemblages, the amphibolite and greenschist facies, had overprinted the preexisting granitic gneiss and suggest that the BMC experienced retrograde metamorphic episodes. The LA-ICP-MS zircon U-Pb ages reveal that the primary magmatic activities of BMC were at ca. 2.30-2.24 Ga and the two metamorphic events were at ca. 1.95-1.91 Ga and ca. 1.88-1.85 Ga respectively. These ages indicate that BMC initially intruded during Paleoproterozoic, not as previously suggested at Archean period. The Early Paleoproterozoic metamorphic records and the magmatic thermochronological data in BMC exhibit different evolution paths between the Alxa Block and the NCC. The Alxa Block was most likely an independent Early Paleoproterozoic terrain. Following different amalgamation processes, The Alxa Block combined with Western Block at ca. 1.95 Ga and then united with NCC at ca. 1.85 Ga. (C) 2014 Elsevier Ltd. All rights reserved.
学科主题	火成岩岩石学
WOS关键词	TEMPERATURE-TIME PATHS ; LA-ICP-MS ; HIGH-GRADE METAMORPHISM ; LIAO-JI BELT ; TECTONIC IMPLICATIONS ; KHONDALITE BELT ; EASTERN BLOCK ; REGIONAL METAMORPHISM ; HEXI CORRIDOR ; TECTONOTHERMAL EVENTS
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000343351000017
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41044]
专题	中国地质科学院矿产资源研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 2.Minist Land & Resources, Key Lab Paleomagnetism & Tecton Reconstruct, Beijing 100081, Peoples R China 3.Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA 4.Kunming Univ Sci & Technol, Kunming 650093, Peoples R China 5.Shandong Univ Sci & Technol, Qingdao 266510, Peoples R China
推荐引用方式 GB/T 7714	Wu, Sujuan,Hu, Jianmin,Ren, Minghua,et al. Petrography and zircon U-Pb isotopic study of the Bayanwulashan Complex: Constrains on the Paleoproterozoic evolution of the Alxa Block, westernmost North China Craton[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,94:226-239.
APA	Wu, Sujuan,Hu, Jianmin,Ren, Minghua,Gong, Wangbin,Liu, Yang,&Yan, Jiyuan.(2014).Petrography and zircon U-Pb isotopic study of the Bayanwulashan Complex: Constrains on the Paleoproterozoic evolution of the Alxa Block, westernmost North China Craton.JOURNAL OF ASIAN EARTH SCIENCES,94,226-239.
MLA	Wu, Sujuan,et al."Petrography and zircon U-Pb isotopic study of the Bayanwulashan Complex: Constrains on the Paleoproterozoic evolution of the Alxa Block, westernmost North China Craton".JOURNAL OF ASIAN EARTH SCIENCES 94(2014):226-239.