江南造山带东段新元古代花岗岩组合的年代学和地球化学:对扬子与华夏地块拼合时间与过程的约束

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	江南造山带东段新元古代花岗岩组合的年代学和地球化学:对扬子与华夏地块拼合时间与过程的约束; Geochronology and geochemisty of the Neoproterozoic granitoid association from eastern segment of the Jiangnan orogen, China Constraints on the timing and process of amalgamation between the Yangtze and Cathaysia blocks
	薛怀民 ; 马芳 ; 宋永勤 ; 谢亚平
刊名	岩石学报
	2010
关键词	锆石定年新元古代 S型花岗岩 A型花岗岩江南造山带扬子克拉通 Zircon dating Neoproterozoic S-type granite A type granite Jiangnan orogen Yangtze craton
英文摘要	江南造山带东段发育了一系列新元古代的花岗岩类侵入体,本文用LA-ICP-MS锆石U-Pb法对区内出露的主要岩体(包括许村岩体、歙县岩体、休宁岩体、灵山岩体、莲花山岩体、石耳山岩体)进行了定年,并分析了这些岩体代表性样品的主量和微量元素含量。结果表明,区内的花岗岩类侵入体分属S-型和A-型两类,前者属于同造山的岩浆岩,成分主要为花岗闪长质;后者为晚造山的岩浆岩,成分为花岗质。S-型花岗闪长质岩浆是在碰撞、地壳加厚后由不成熟的变质沉积-火山岩系经减压熔融形成的。由同造山到晚造山阶段,随着地壳应力由挤压转为拉张,所形成的A-型花岗岩中有明显的新生地幔物质的加入。两类岩体的空间分布有明显的规律,且随时...; There are a series of Neoproterozoic granitoids developed in eastern segment of the Jiangnan orogen, LA-ICP-MS zircon U-Pb ages and whole-rock geochemical compositions were determined for those main granitoid intrusions, including Xucun body, Shexian body, Xiuning body, Lingshan body, Lianhuashan body and Shi'ershan body The granitoid intrusions in the region can be classified into S type and A type in petrology and geochemistry, and the former belong to synorogenic magmatic rocks and are mainly granodiorite in component, while the latter belong to late orogenic magmatic rocks and are granitic in component The S type granodiorite magma was generated by partial melting of Immature metamorphic sedimentary-volcanic rock series under dynamic background of collision and crust thicken But from synorogenic to late-orogenic stages, along with the stress changed fron extrusion to extension, he A-type granites formed include obvious mantle derived matter The two types intrusions distributed regularly in space, show obvious southward (ocean side) migration with time The synorogenic S-type granodioritic intrusions are all located at the north of the South Anhui suture belt (and inside the suture zone), the Xucun intrusion of S-type granodiorite, situated at the most north part has the earliest emplacement age of 850 +/- 10Ma, Shexian intrusion of S-type granodiorite, which located inside the Anhui suture zone and ha, the feature of syntectonic, has the emplacement age of 838 +/- 11 Ma, and also located inside the suture zone but has the feature of late tectonic the Xiuning intrusion of S-type granodiorite has the intrusion age of 826 +/- 6Ma. Whereas late-orogenic A-type granites are all located at the south of the suture zone, emplacement ages for Lingshan and Lianhuashan A-type granites are 823 +/- 18Ma and 814 +/- 26 respectively, the two ages are consistent each other considering the errors, and can represent as the time of late-orogenic stage magmatism The Shi'ershan granite-porphyry formed in post-orogenic rift setting has the emplacement age of 785 +/- 11 Ma We consider that till Jiangnan orogen formed in Neoproterozoic era, with characteristics of poly island arcs amalgalation and poly-sutures The closing times for different sutures are difference, the earliest closing suture may be the Northeast Jiangxi suture, followed by the Jiangshan-Shaoxin suture, the South Anhui suture was final closed The arc-type volcanic rocks related with different suture are difference in geochemistry, the two former were developed on oceanic crust background, while the latter was formed on immature continental crust The Jiangnan orogen had been destroyed by post-orogenic rifting before long it formed, Just up to the telophase of Early Paleozoic, the rift between the Yangtze and Cathaysia cratons bad final been closed and formed unionized continent of South China.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000285033000006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 32; 11; 3215-3244; 26
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/241847]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	薛怀民,马芳,宋永勤,等. 江南造山带东段新元古代花岗岩组合的年代学和地球化学:对扬子与华夏地块拼合时间与过程的约束, Geochronology and geochemisty of the Neoproterozoic granitoid association from eastern segment of the Jiangnan orogen, China Constraints on the timing and process of amalgamation between the Yangtze and Cathaysia blocks[J]. 岩石学报,2010.
APA	薛怀民,马芳,宋永勤,&谢亚平.(2010).江南造山带东段新元古代花岗岩组合的年代学和地球化学:对扬子与华夏地块拼合时间与过程的约束.岩石学报.
MLA	薛怀民,et al."江南造山带东段新元古代花岗岩组合的年代学和地球化学:对扬子与华夏地块拼合时间与过程的约束".岩石学报 (2010).