NEOPROTEROZOIC S-TYPE GRANITES IN THE ALXA BLOCK, WESTERNMOST NORTH CHINA AND TECTONIC IMPLICATIONS: IN SITU ZIRCON U-Pb-Hf-O ISOTOPIC AND GEOCHEMICAL CONSTRAINTS

doi:10.2475/01.2014.04

	NEOPROTEROZOIC S-TYPE GRANITES IN THE ALXA BLOCK, WESTERNMOST NORTH CHINA AND TECTONIC IMPLICATIONS: IN SITU ZIRCON U-Pb-Hf-O ISOTOPIC AND GEOCHEMICAL CONSTRAINTS
	Dan, Wei 1,2; Li, Xian-hua 1,4,5; Wang, Qiang 2; Wang, Xuan-ce 3; Liu, Yu 1
刊名	AMERICAN JOURNAL OF SCIENCE
	2014
卷号	314 期号:1 页码:110-153
关键词	North China Craton Alxa Block Neoproterozoic S-type granite zircon Hf-O isotopes
ISSN号	0002-9599
DOI	10.2475/01.2014.04
文献子类	Article
英文摘要	The Alxa Block in northern China has been traditionally considered as the westermnost part of the Archean North China Craton (NCC). However, recent studies revealed that there are few Archean rocks exposed in the Alxa Block, and the Paleoproterozoic geology of this block is different from that of the western part of the NCC. Thus, the tectonic affinity of the Alxa Block to the NCC and/or other Precambrian blocks needs further investigations. In this study, we carry out integrated analyses of in situ zircon U-Pb age and Hf-O isotopes as well as whole-rock geochemistry and Nd isotopes for the Neoproterozoic Dabusushan and Naimumaodao granites from central Alxa Block. Secondary ion mass spectrometry (SIMS) U-Pb zircon dating results indicate that the Naimumaodao and Dabusushan granite plutons were formed at ca. 930 Ma and ca. 910 Ma, respectively. These granites are peraluminous (A/CNK value >1.0), and contain peraluminous minerals such as muscovite and tourmaline, similar to those of S-type granites. They are characterized by high zircon delta O-18 values of ca. 8.2 to 12.1 permil, corresponding to a calculated magmatic delta O-18 value of ca. 10.5 to 14.3 permil, variable zircon epsilon(Hf)(t) values of -6.2 to +3.8 (corresponding to Hf model ages of 2.2 to 1.6 Ga) and whole-rock epsilon(Nd)(t) values of -10.1 to -4.5 (corresponding to Nd model ages of 2.4-1.9 Ga). The petrological and Nd-Hf-O isotopic study indicated that these granites were most probably generated by remelting of dominant (meta)sedimentary rocks in an orogenesis-related compressional environment. There is a clear contrast in the Precambrian geological evolution, including basement rock age data, Precambrian magmatism and detrital zircon age patterns, between the Alxa Block and the NCC. Furthermore, the new in-situ detrital zircon ages on Neoproterozoic (meta) sedimentary rock suggest that Alxa Block is likely related to the Cathaysia Block of South China during the Neoproterozoic, and amalgamated with the NCC since the Early Paleozoic. Thus, our new data suggest that the Alxa Block is most likely a separated Precambrian terrane from the Western Block of the NCC.
WOS关键词	PRECAMBRIAN CRUSTAL EVOLUTION ; DETRITAL-ZIRCONS ; YANGTZE BLOCK ; SOUTH CHINA ; LU-HF ; PALEOPROTEROZOIC EVOLUTION ; EAST ANTARCTICA ; CRATON EVIDENCE ; METAMORPHIC EVOLUTION ; SILICICLASTIC ROCKS
WOS研究方向	Geology
语种	英语
出版者	AMER JOURNAL SCIENCE
WOS记录号	WOS:000333945400006
资助机构	National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; National Natural Science Foundation of China(41221002) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105) ; research grant of State Key Laboratory of Geological Processes and Mineral Resources(GPMR201105)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/85256]
专题	中国科学院地质与地球物理研究所
通讯作者	Li, Xian-hua
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China 3.Curtin Univ Technol, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Perth, WA 6845, Australia 4.Curtin Univ Technol, Inst Geosci Res, Dept Appl Geol, Perth, WA 6845, Australia 5.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Dan, Wei,Li, Xian-hua,Wang, Qiang,et al. NEOPROTEROZOIC S-TYPE GRANITES IN THE ALXA BLOCK, WESTERNMOST NORTH CHINA AND TECTONIC IMPLICATIONS: IN SITU ZIRCON U-Pb-Hf-O ISOTOPIC AND GEOCHEMICAL CONSTRAINTS[J]. AMERICAN JOURNAL OF SCIENCE,2014,314(1):110-153.
APA	Dan, Wei,Li, Xian-hua,Wang, Qiang,Wang, Xuan-ce,&Liu, Yu.(2014).NEOPROTEROZOIC S-TYPE GRANITES IN THE ALXA BLOCK, WESTERNMOST NORTH CHINA AND TECTONIC IMPLICATIONS: IN SITU ZIRCON U-Pb-Hf-O ISOTOPIC AND GEOCHEMICAL CONSTRAINTS.AMERICAN JOURNAL OF SCIENCE,314(1),110-153.
MLA	Dan, Wei,et al."NEOPROTEROZOIC S-TYPE GRANITES IN THE ALXA BLOCK, WESTERNMOST NORTH CHINA AND TECTONIC IMPLICATIONS: IN SITU ZIRCON U-Pb-Hf-O ISOTOPIC AND GEOCHEMICAL CONSTRAINTS".AMERICAN JOURNAL OF SCIENCE 314.1(2014):110-153.