中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
The Bikou basalts in the northwestern Yangtze block, South China: Remnants of 820-810 Ma continental flood basalts?

文献类型：期刊论文

作者Wang, Xuan-Ce1,2; Li, Xian-Hua1,2; Li, Wu-Xian2; Li, Zheng-Xiang3; Liu, Ying2; Yang, Yue-Heng1; Liang, Xi-Rong2; Tu, Xiang-Lin2
刊名GEOLOGICAL SOCIETY OF AMERICA BULLETIN
出版日期2008-11-01
卷号120期号:11-12页码:1478-1492
关键词Neoproterozoic continental flood basalts Nd-Hf isotopes Yangtze block South China mantle plume Rodinia
ISSN号0016-7606
DOI10.1130/B26310.1
文献子类Article
英文摘要Mantle plume or superplume activities have often been invoked as a cause for the breakup of the Neoproterozoic supercontinent Rodinia. However, associated Neoproterozoic continental flood basalts, a requisite product of mantle plume activities, have rarely been identified. New sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon ages, geochemical, and Hf-Nd isotopic data are reported here for the Bikou Group basalts, the largest Neoproterozoic volcanic units in the northwestern Yangtze block, South China. The Bikou basalts are mainly tholeiitic in composition, and they can be stratigraphically subdivided into the lower and upper groups. SHRIMP U-Pb zircon dating of intercalated rhyolites indicates that the lower and upper group basalts were erupted at 821 +/- 7 Ma and 811 +/- 12 Ma, respectively. The two basalt groups define two populations on most elemental and isotopic diagrams. The lower group basalts display strong subcontinental lithospheric mantle affinities and large variable epsilon(Nd(t)) and epsilon(Hf(t)) values that correlate negatively with Th/Ta and positively with MgO. The upper group basalts, on the other hand, show ocean-island basalt (018) affinities and highly positive epsilon(Hf(t)) and epsilon(Nd(t)) values. Numerical modeling indicates that the lower and upper group basalts were formed at melting temperatures of >1350 degrees C and >1450 degrees C and mantle potential temperatures of 1400-1488 degrees C and 1550 +/- 30 degrees C, respectively. Thus, the upper group basalts were derived from an anomalously hot asthenosphere mantle, similar to 160 degrees C hotter than the contemporary ambient mid-ocean-ridge basalt (MORB) source mantle. Our results are at clear variance with the alternative tectonic model that the Bikou basalts were part of a continental magmatic arc. Our work suggests that the Bikou basalts are likely the remnants of Neoproterozoic continental flood basalts that formed in response to a mantle plume starting ca. 825 Ma during the breakup of the supercontinent Rodinia.
WOS关键词OCEAN ISLAND BASALTS ; NEOPROTEROZOIC TECTONIC EVOLUTION ; PB ZIRCON GEOCHRONOLOGY ; BIMODAL VOLCANIC-ROCKS ; MANTLE PLUME ; BREAK-UP ; SM-ND ; GEOCHEMICAL EVIDENCE ; WESTERN MARGIN ; LU-HF
WOS研究方向Geology
语种英语
WOS记录号WOS:000260737900009
出版者GEOLOGICAL SOC AMER, INC
资助机构National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; National Natural Science foundation of China(40721063) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Chinese Academy of Sciences(KZCX3-SW-141) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228) ; Australian Research Council(DP0770228)
源URL[http://ir.iggcas.ac.cn/handle/132A11/68742]  
专题中国科学院地质与地球物理研究所
通讯作者Wang, Xuan-Ce
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, Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Peoples R China
3.Curtin Univ Technol, Dept Appl Geol, Inst Geosci Res, Perth, WA 6845, Australia
推荐引用方式
GB/T 7714		 Wang, Xuan-Ce,Li, Xian-Hua,Li, Wu-Xian,et al. The Bikou basalts in the northwestern Yangtze block, South China: Remnants of 820-810 Ma continental flood basalts?[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2008,120(11-12):1478-1492.
APA Wang, Xuan-Ce.,Li, Xian-Hua.,Li, Wu-Xian.,Li, Zheng-Xiang.,Liu, Ying.,...&Tu, Xiang-Lin.(2008).The Bikou basalts in the northwestern Yangtze block, South China: Remnants of 820-810 Ma continental flood basalts?.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,120(11-12),1478-1492.
MLA Wang, Xuan-Ce,et al."The Bikou basalts in the northwestern Yangtze block, South China: Remnants of 820-810 Ma continental flood basalts?".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 120.11-12(2008):1478-1492.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。