IS THE ORDOS BLOCK ARCHEAN OR PALEOPROTEROZOIC IN AGE? IMPLICATIONS FOR;THE PRECAMBRIAN EVOLUTION OF THE NORTH CHINA CRATON

doi:10.2475/07.2013.03

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	IS THE ORDOS BLOCK ARCHEAN OR PALEOPROTEROZOIC IN AGE? IMPLICATIONS FOR;THE PRECAMBRIAN EVOLUTION OF THE NORTH CHINA CRATON
	Wan, Yusheng 1,5; Xie, Hangqiang 1; Yang, Hua 2; Wang, Zejiu 3; Liu, Dunyi 1; Kroner, Alfred 1; Wilde, Simon A.; Geng, Yuansheng ; Sun, Liuyi 2; Ma, Mingzhu 1
刊名	AMERICAN JOURNAL OF SCIENCE
	2013
卷号	313 期号:7 页码:683-711
关键词	Ordos basement early Precambrian North China Craton zircon dating Hf analysis
ISSN号	0002-9599;EI 1945-452X
DOI	10.2475/07.2013.03
英文摘要	The Ordos Block is a large but poorly exposed crustal segment in the western part of the North China Craton. Little is known about its Precambrian basement rocks and their evolution because of an extensive cover by younger sedimentary rocks. We report SHRIMP zircon ages and Hf-in-zircon isotopic compositions for five samples recovered from drill holes that penetrated into the Ordos basement. Based on these data, two age groups of rocks can be distinguished: an early Paleoproterozoic group that is represented by one sample from the northern margin of the Ordos Block and a late (or middle-late) Paleoproterozoic group consisting of the remaining four samples. The early Paleoproterozoic sample contains zircon cores and metamorphic rims with ages of >2.4 Ga and >2.28 Ga, respectively. The cores have epsilon(Hf)(t) values of -8.8 to 6.2 and Hf crustal model ages of 2606 to 3221 Ma. The remaining rocks of late (or middle-late) Paleoproterozoic age contain zircons that may also show a core-rim structure, but with the cores having ages of similar to 2.08 Ga and the metamorphic rims recording ages of similar to 1.9 Ga. The zircon cores have epsilon(Hf)(t) values of -9.1 to 10.1, and Hf crustal model ages of 2039 to 3068 Ma.,Combined with data from earlier studies, we draw the conclusion that late Paleoproterozoic metasedimentary rocks are widespread in the Ordos basement. There is no evidence from our samples of an Archean component, and this calls into question the prevailing view that the Ordos basement is an Archean cratonic block. The fact that the Ordos basement was involved in a widespread late Paleoproterozoic tectono-thermal event indicates that most current models for the tectonic evolution of the western portion of the North China Craton need to be revised.
学科主题	前寒武纪地质
WOS关键词	PB ZIRCON AGES ; ULTRAHIGH-TEMPERATURE METAMORPHISM ; HF ISOTOPE ; COMPOSITION ; U-PB ; TECTONIC EVOLUTION ; WESTERN BLOCK ; KHONDALITE BELT ; SHRIMP ZIRCON ; COLUMBIA SUPERCONTINENT ; DETRITAL ZIRCONS
WOS研究方向	Geology
语种	英语
出版者	AMER JOURNAL SCIENCE
WOS记录号	WOS:000324222900003
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40186]
专题	中国地质调查局国土资源航空物探遥感中心
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Beijing SHRIMP Ctr, Beijing 100037, Peoples R China. 3.Changqing Oilfield Co PetroChina, Xian 710018, Peoples R China. 4.Chinese Acad Geol Sci, Beijing 100037, Peoples R China. 5.Wilde, Simon A.] Curtin Univ, Dept Appl Geol, Perth, WA 6845, Australia. 6.Chinese Acad Geol Sci, Inst Mineral Resources, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Wan, Yusheng,Xie, Hangqiang,Yang, Hua,et al. IS THE ORDOS BLOCK ARCHEAN OR PALEOPROTEROZOIC IN AGE? IMPLICATIONS FOR;THE PRECAMBRIAN EVOLUTION OF THE NORTH CHINA CRATON[J]. AMERICAN JOURNAL OF SCIENCE,2013,313(7):683-711.
APA	Wan, Yusheng.,Xie, Hangqiang.,Yang, Hua.,Wang, Zejiu.,Liu, Dunyi.,...&Du, Lilin.(2013).IS THE ORDOS BLOCK ARCHEAN OR PALEOPROTEROZOIC IN AGE? IMPLICATIONS FOR;THE PRECAMBRIAN EVOLUTION OF THE NORTH CHINA CRATON.AMERICAN JOURNAL OF SCIENCE,313(7),683-711.
MLA	Wan, Yusheng,et al."IS THE ORDOS BLOCK ARCHEAN OR PALEOPROTEROZOIC IN AGE? IMPLICATIONS FOR;THE PRECAMBRIAN EVOLUTION OF THE NORTH CHINA CRATON".AMERICAN JOURNAL OF SCIENCE 313.7(2013):683-711.