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题名: Mid-Neoproterozoic diabase dykes from Xide in the western Yangtze Block, South China: New evidence for continental rifting related to the breakup of Rodinia supercontinent
作者: Cui, Xiaozhuang1, 2; Jiang, Xinsheng1, 2; Wang, Jian1, 2; Wang, Xuance3; Zhuo, Jiewen1, 2; Deng, Qi1, 2; Liao, Shiyong4; Wu, Hao1; Jiang, Zhuofei5; Wei, Yanan5
刊名: PRECAMBRIAN RESEARCH
出版日期: 2015-10-01
卷号: 268, 页码:339-356
关键词: Diabase dykes ; Neoproterozoic ; Continental rifting ; Western Yangtze Block ; South China ; Rodinia supercontinent
学科分类: 天文和天体物理
DOI: 10.1016/j.precamres.2015.07.017
文章类型: Article
英文摘要: The petrogenesis of widespread Mid-Neoproterozoic mafic dykes is crucial for the paleographic position of the South China Block (SCB) in Rodinia supercontinent and the mechanism of Rodinia breakup. Here, new detailed geochronological and geochemical data on the diabase dykes from Xide in the western Yangtze Block are presented. Zircon SHRIMP/LA-ICP-MS U-Pb dating shows that four diabase samples yield uniform crystallization age varying from 796 +/- 6 Ma to 809 +/- 15 Ma, while one sample gives a slight older age of 824 +/- 11 Ma that is overlapped with ca. 810 Ma within uncertainties. This suggests that the Xide diabase dykes emplaced at ca. 800-810 Ma and were coeval with regional bimodal magmatism (e.g., the Suxiong bimodal volcanics). The Xide diabase dykes are characterized by low SiO2 contents, high Mg# values and Cr, Ni contents, relative enrichment of light rare-earth elements, and slight depletion of high field strength elements (e.g., Nb, Ta, Zr, and Hf) and nearly constant Zr/Hf, Nb/Ta and Nb/La ratios. Our analyses indicate that the diabase was mainly produced by interaction between lithospheric and asthenospheric mantle. Moreover, the diabase samples display geochemical characteristics affinity with typical intra-plate basalts. Together with the widespread coeval bimodal magmatic suite and sedimentary records in the Kangdian Rift, we proposed that the western Yangtze Block once experienced continental rifting during the Mid-Neoproterozoic, which also occurred in other Rodinia blocks, such as Tarim, Australia and North America. In addition, the Grenville-aged magmatism records throughout SCB with the widespread Mid-Neoproterozoic rift-related magmatism and sedimentation records imply that SCB probably played a key role in the assembly and breakup of Rodinia supercontinent. (C) 2015 Elsevier B.V. All rights reserved.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Geosciences, Multidisciplinary
研究领域[WOS]: Geology
关键词[WOS]: U-PB ZIRCON ; LA-ICP-MS ; LARGE IGNEOUS PROVINCE ; LU-HF ISOTOPES ; GEOCHEMICAL EVIDENCE ; SW CHINA ; TECTONIC EVOLUTION ; JIANGNAN OROGEN ; VOLCANIC-ROCKS ; MAFIC INTRUSIONS
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
WOS记录号: WOS:000362148300018
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14874
Appears in Collections:南极天文中心_期刊论文

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作者单位: 1.China Geol Survey, Chengdu Ctr, Chengdu 610081, Peoples R China
2.Minist Land & Resources, Key Lab Sedimentary Basin & Hydrocarbon Resource, Chengdu 610081, Peoples R China
3.Curtin Univ, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Perth, WA 6845, Australia
4.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
5.China Univ Geosci, Sch Geosci & Resources, Beijing 100083, Peoples R China
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