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Initiation of continental breakup documented in evolution of the magma plumbing system of the ca. 925 Ma Dashigou large igneous province, North China

文献类型：期刊论文

作者Su, Xiangdong1,2; Peng, Peng1,3; Foley, Stephen4; Teixeira, Wilson5; Zhai, Ming-Guo1,3
刊名LITHOS
出版日期2021-03-01
卷号384页码:18
关键词Magma plumbing system Wilson cycle Large Igneous Province Rodinia breakup North China craton
ISSN号0024-4937
DOI10.1016/j.lithos.2021.105984
英文摘要In theWilson cycle, continental rifting leads to ocean basin formation, but the relationship between rift-related magmatism and the initiation of seafloor spreading and continental drift remains unclear. A recently recognized large igneous province (LIP), the ca.925Ma Dashigou LIP of the North China Craton, possibly represents initial of continental breakup. The magmatic center of this LIP is thought to be located in the Xuhuai basin, where two generations of sill complexes (945-920 Ma Niutishan and 915-890 Ma Pingshan) occur. Both complexes are dominantly tholeiitic, with minor alkaline rocks in the Pingshan complex. The Niutishan complex compositionally varies from gabbro (SiO2 = 48.0-49.0 wt%, MgO = 4.0-6.0 wt%) to quartz dolerite (SiO2 = 53.0-56.0 wt%, MgO = 2.0- 3.0 wt%), while the Pingshan complex is comprised of more primitive gabbro (SiO2 = 47.0-48.5 wt%, MgO > 6.0 wt%) with only a few quartz syenite veins (SiO2 = 58.5-59.8 wt%, MgO = 1.0-1.2 wt%). Trace elements and isotopic compositions indicate a relatively minor continental signature in the Niutishan parental magma (Sr-87/Sr-86(initial) = 0.7040-0.7048, epsilon Nd-initial = -0.84 to +1.91, Nb/La = 0.8-1.2), while Pingshan exhibits transitional to MORB compositions and shows distinct geochemical signals of seawater alteration (Sr-87/Sr-86(initial) = 0.7060-0.7079, epsilon Nd-initial = -1.34 to -0.23, Nb/La = 0.6-0.7). The compositional ranges of both units are consistentwith varied degrees of partial melting in the source regions followed by varied degrees of fractionation in themagma chambers/plumbing systems. Sr isotopic characteristics indicate a possible increasing in alteration of oceanic fluids through time. Coherent geochemical features show that the far-field radiating Dashigou dyke swarm and Niutishan events belong to the plumbing system of a single LIP in a pre-drift environment. The Pingshan complex is probably related to the growth of an inner subaerial seaward-dipping syn-rift reflector sequence. The plumbing systemevolved froma sill complex (Niutishan) near themagmatic center at ca. 945Ma to a far-field radiating dyke swarm (Dashigou) at ca. 925Ma, which then reverted back to a sill complex (Pingshan) near the magmatic center at ca. 915Ma. The Dashigou LIPmay be correlated with the BahiaGangila LIP of the Sao Francisco-Congo Craton, and the evolution of their magmatic plumbing systems is interpreted as an indication of rift-to-drift transition tectonics, which resulted in the initiation of seafloor spreading and consequent drift. (C) 2021 Elsevier B.V. All rights reserved.
WOS关键词MAFIC DYKE SWARMS ; PB BADDELEYITE AGES ; U-PB ; SAO-FRANCISCO ; SOUTHEASTERN MARGIN ; LIAODONG PENINSULA ; CRATON EVIDENCE ; PETROGENESIS ; GEOCHEMISTRY ; INSIGHTS
资助项目NSFC[41890833] ; NSFC[41772192] ; NSFC[41702362] ; CAS Projects[XDB41020501] ; CAS Projects[QYZDBSSW-DQC042] ; NRFK[NRF-2017R1A2B2011224] ; National Council of Technological and Scientific Development (CNPq)[303498/2014-5]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000652195000024
出版者ELSEVIER
资助机构NSFC ; NSFC ; CAS Projects ; CAS Projects ; NRFK ; NRFK ; National Council of Technological and Scientific Development (CNPq) ; National Council of Technological and Scientific Development (CNPq) ; NSFC ; NSFC ; CAS Projects ; CAS Projects ; NRFK ; NRFK ; National Council of Technological and Scientific Development (CNPq) ; National Council of Technological and Scientific Development (CNPq) ; NSFC ; NSFC ; CAS Projects ; CAS Projects ; NRFK ; NRFK ; National Council of Technological and Scientific Development (CNPq) ; National Council of Technological and Scientific Development (CNPq) ; NSFC ; NSFC ; CAS Projects ; CAS Projects ; NRFK ; NRFK ; National Council of Technological and Scientific Development (CNPq) ; National Council of Technological and Scientific Development (CNPq)
源URL[http://ir.iggcas.ac.cn/handle/132A11/101189]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Peng, Peng
作者单位1.Chinese Acad Sci, China Brazil Joint Geosci Res Ctr, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Zhengzhou Univ, Coll Earth Sci & Technol, Zhengzhou 450001, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Macquarie Univ, Dept Earth & Environm Sci, Sydney, NSW 2109, Australia
5.Univ Sao Paulo, Inst Geosci, Sao Paulo, SP, Brazil
推荐引用方式
GB/T 7714		 Su, Xiangdong,Peng, Peng,Foley, Stephen,et al. Initiation of continental breakup documented in evolution of the magma plumbing system of the ca. 925 Ma Dashigou large igneous province, North China[J]. LITHOS,2021,384:18.
APA Su, Xiangdong,Peng, Peng,Foley, Stephen,Teixeira, Wilson,&Zhai, Ming-Guo.(2021).Initiation of continental breakup documented in evolution of the magma plumbing system of the ca. 925 Ma Dashigou large igneous province, North China.LITHOS,384,18.
MLA Su, Xiangdong,et al."Initiation of continental breakup documented in evolution of the magma plumbing system of the ca. 925 Ma Dashigou large igneous province, North China".LITHOS 384(2021):18.

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来源：地质与地球物理研究所

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