From amalgamation to post-orogenic Rodinian rifting:Decoded by the Neoproterozoic Shenshan Group,South ChinaOA
The Shenshan Group provides important geological information which is vital in unraveling the amalgamation and subsequent rifting processes of South China.While conventional studies have asserted its formation in a subduction setting,the distinct investigation reveals the necessity for reassessment.To address this,the authors employ integrated methods encompassing petrological,zircon U-Pb geochronological,Lu-Hf isotopic and geochemical methods for sedimentary rocks from the upper Shenshan subgroup and Banxi Group.The geochemical results indicate that they were formed through the recycling deposition of intermediate-acidic igneous source material and experienced moderate chemical weathering.Additionally,both sedimentary sequences exhibit characteristics consistent with those formed in an intracontinental extensional rift setting since ca.810 Ma.The provenance analysis indicates that the upper Shenshan subgroup primarily originates from the Yangtze Domain,while the Banxi Group from both the Yangtze and Cathaysia domains.Synthesizing with previous studies,the Shenshan Group should be subdivided into the lower and upper subgroups which represent distinct tectonic backgrounds.The lower subgroup is inferred to have formed in an Early Neoproterozoic fore-arc setting,akin to the Zhoutan group.The upper subgroup corresponds to the Banxi Group,representing the Middle Neoproterozoic postorogenic rift setting,responding to the breakup of Rodinia.
Hong-shuai Wu;Yu-zhi Zhang;Xue Yang;Jian-wen Yang;Meng-yuan Li;Xiao-qing Yu;Cheng Wang;Cheng-shi Gan
Guangdong Provincial Key Lab of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,Zhuhai 519080,China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,ChinaGuangdong Provincial Key Lab of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,Zhuhai 519080,China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China School of the Environment,University of Windsor,Windsor ON N9B 3P4,CanadaChina National Offshore Oil Corporation China Limited,Shenzhen Branch,Shenzhen 518054,ChinaSchool of the Environment,University of Windsor,Windsor ON N9B 3P4,CanadaGuangdong Provincial Key Lab of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,Zhuhai 519080,China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,ChinaGuangdong Provincial Key Lab of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,Zhuhai 519080,China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,ChinaGuangdong Provincial Key Lab of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,Zhuhai 519080,China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,ChinaGuangdong Provincial Key Lab of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-Sen University,Zhuhai 519080,China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China
天文与地球科学
South China plateSubdivision of the Shenshan GroupThe upper Shenshan SubgroupSedimentary rockIntermediate-acidic igneous source materialPost-orogenic rift settingMeso-NeoproterozoicFore-arc environmentRodinian continental riftingGeological survey engineering
《China Geology》 2026 (1)
P.102-119,I0001-I0014,32
supported by the National Natural Science Foundation of China(42372250,42102262 and 41972235)National Key Research and Development Program Project(2023YFF0803701)Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(SML2023SP206)the program of China Scholarship Council。
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