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CA. 850 MA BIMODAL VOLCANIC ROCKS IN NORTHEASTERN JIANGXI PROVINCE, SOUTH CHINA: INITIAL EXTENSION DURING THE BREAKUP OF RODINIA?

文献类型：期刊论文

作者Li, W. X.1,2; Li, X. H.3; Li, Z. X.2
刊名AMERICAN JOURNAL OF SCIENCE
出版日期2010-11-01
卷号310期号:9页码:951-980
关键词Neoproterozoic Rift magmatism Yangtze Block South China Rodinia supercontinent Superplume
ISSN号0002-9599
DOI10.2475/09.2010.08
文献子类Article
英文摘要Multiple Meso- to Neoproterozoic magmatic events in South China are believed to record the transition in tectonic regime from the assembly of the supercontinent Rodinia to its breakup. We document in this paper the earliest, ca. 850 Ma bimodal volcanism in South China which may indicate the beginning of continental extension and rifting. The Zhenzhushan bimodal volcanic rocks were dated at 849 +/- 6 Ma using the secondary ion mass spectrometry (SIMS) U-Pb zircon method. The mafic members of the succession are Si-saturated tholeiitic basalts with moderate enrichment in most incompatible trace elements and high epsilon Nd(T) values of 2.1 to 4.8. This suggests a likely derivation of the basalts from a depleted asthenospheric mantle source in an extensional environment, and that the magma experienced low-degree fractional crystallization and crustal contamination during its ascent to the surface. The felsic members are peraluminous and are characterized by negative epsilon Nd(T) values of -0.3 to -1.9 with geochemical features similar to those of the adjacent ca. 820 Ma peraluminous granitoids derived from a Mesoproterozoic to earliest Neoproterozoic sedimentary source. In combination with the distribution of 850 to 830 Ma igneous and sedimentary successions in South China, we suggest that continental rifting along the southern margin of the Yangtze Block probably started by 850 Ma. Coeval anorogenic magmatism has also been reported in other parts of the Rodinia supercontinent, and may represent the early stage of the Rodinia superplume in response to a circumRodinia mantle avalanche after the complete assembly of the supercontinent.
WOS关键词NEOPROTEROZOIC TECTONIC EVOLUTION ; PB ZIRCON GEOCHRONOLOGY ; WESTERN YANGTZE BLOCK ; TRUE POLAR WANDER ; RIO-GRANDE RIFT ; CATHAYSIA BLOCKS ; CONTINENTAL RIFT ; MOINE SUPERGROUP ; MANTLE PLUME ; HF ISOTOPES
WOS研究方向Geology
语种英语
WOS记录号WOS:000288405900009
出版者AMER JOURNAL SCIENCE
资助机构Chinese Academy of Sciences(KZCX2-YW-Q08-4 ; Chinese Academy of Sciences(KZCX2-YW-Q08-4 ; NSFC(40721063 ; NSFC(40721063 ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Institute for Geoscience Research (TIGeR) ; Institute for Geoscience Research (TIGeR) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; KZCX1-VW-15-2 ; KZCX1-VW-15-2 ; 40773016) ; 40773016) ; KZCX2-YW-128) ; KZCX2-YW-128) ; Chinese Academy of Sciences(KZCX2-YW-Q08-4 ; Chinese Academy of Sciences(KZCX2-YW-Q08-4 ; NSFC(40721063 ; NSFC(40721063 ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Institute for Geoscience Research (TIGeR) ; Institute for Geoscience Research (TIGeR) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; KZCX1-VW-15-2 ; KZCX1-VW-15-2 ; 40773016) ; 40773016) ; KZCX2-YW-128) ; KZCX2-YW-128) ; Chinese Academy of Sciences(KZCX2-YW-Q08-4 ; Chinese Academy of Sciences(KZCX2-YW-Q08-4 ; NSFC(40721063 ; NSFC(40721063 ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Institute for Geoscience Research (TIGeR) ; Institute for Geoscience Research (TIGeR) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; KZCX1-VW-15-2 ; KZCX1-VW-15-2 ; 40773016) ; 40773016) ; KZCX2-YW-128) ; KZCX2-YW-128) ; Chinese Academy of Sciences(KZCX2-YW-Q08-4 ; Chinese Academy of Sciences(KZCX2-YW-Q08-4 ; NSFC(40721063 ; NSFC(40721063 ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Institute for Geoscience Research (TIGeR) ; Institute for Geoscience Research (TIGeR) ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences ; KZCX1-VW-15-2 ; KZCX1-VW-15-2 ; 40773016) ; 40773016) ; KZCX2-YW-128) ; KZCX2-YW-128)
源URL[http://ir.iggcas.ac.cn/handle/132A11/72364]  
专题中国科学院地质与地球物理研究所
通讯作者Li, W. X.
作者单位1.Chinese Acad Sci, Key Lab Isotope Geochronol & Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
2.Curtin Univ Technol, Inst Geosci Res, Dept Appl Geol, Perth, WA 6845, Australia
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Li, W. X.,Li, X. H.,Li, Z. X.. CA. 850 MA BIMODAL VOLCANIC ROCKS IN NORTHEASTERN JIANGXI PROVINCE, SOUTH CHINA: INITIAL EXTENSION DURING THE BREAKUP OF RODINIA?[J]. AMERICAN JOURNAL OF SCIENCE,2010,310(9):951-980.
APA Li, W. X.,Li, X. H.,&Li, Z. X..(2010).CA. 850 MA BIMODAL VOLCANIC ROCKS IN NORTHEASTERN JIANGXI PROVINCE, SOUTH CHINA: INITIAL EXTENSION DURING THE BREAKUP OF RODINIA?.AMERICAN JOURNAL OF SCIENCE,310(9),951-980.
MLA Li, W. X.,et al."CA. 850 MA BIMODAL VOLCANIC ROCKS IN NORTHEASTERN JIANGXI PROVINCE, SOUTH CHINA: INITIAL EXTENSION DURING THE BREAKUP OF RODINIA?".AMERICAN JOURNAL OF SCIENCE 310.9(2010):951-980.

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来源：地质与地球物理研究所

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