辽东营口-辽阳地区古元古代花岗岩和变质基性岩形成时代及意义

doi:10.3969/j.issn.1672-6561.2017.02.002

CORC > 北京大学 > 地球与空间科学学院

	辽东营口-辽阳地区古元古代花岗岩和变质基性岩形成时代及意义; Paleoproterozoic Granites and Meta-mafic Rocks from Yingkou-Liaoyang Area of the Eastern Liaoning and Their Significance
	李超 ; 孙克克 ; 陈斌
刊名	地球科学与环境学报
	2017
关键词	花岗岩基性岩古元古代锆石U-Pb年龄地球化学弧后盆地胶辽吉带华北克拉通 granite mafic rock Paleoproterozoic zircon U-Pb age geochemistry back-arc basin Jiao-Liao-Ji Belt North China Craton
DOI	10.3969/j.issn.1672-6561.2017.02.002
英文摘要	辽东地区保存有较为完好的古元古代地质记录.对位于辽东营口-辽阳地区古元古代花岗岩(建一花岗岩)和变质基性岩(隆昌变质辉绿岩和蒜盘峪变质辉长岩)进行了锆石U-Pb定年、地球化学和岩石成因学研究.结果表明:建一花岗岩形成于(2 322±18)Ma,隆昌变质辉绿岩形成于(2 335±21)Ma,蒜盘峪变质辉长岩形成于(2 353±22)Ma;建一花岗岩源自太古宙古老地壳部分熔融,属于准铝质钙碱性I型花岗岩,富集Rb、Ba、U等大离子亲石元素,亏损Nb、Ta、Zr、Hf等高场强元素,具有俯冲带岩浆特征;隆昌变质辉绿岩和蒜盘峪变质辉长岩均具有富集型洋中脊玄武岩(E-MORB)特点,并显示岛弧地球化学特征;隆昌变质辉绿岩源自新太古代富集程度不高的地幔部分熔融,并在上升过程中受到年轻地壳的改造,蒜盘峪变质辉长岩是古太古代-中太古代富集地幔部分熔融的产物;古元古代早期,辽吉地区处于大陆弧后盆地构造环境,弧后伸展作用导致大陆岩石圈部分熔融产生花岗岩和基性岩,在后期的地体拼贴过程中,两者遭受到不同程度的变质变形,进而形成了条痕状花岗岩和变质基性岩.; Paleoproterozoic geological records are well preserved in the eastern Liaoning.The zircon U-Pb dating, geochemical and petrogenesis of Paleoproterozoic granites (Jianyi granite) and meta-mafic rocks (Longchang meta-diabase and Suanpanyu meta-gabbro) in Yingkou-Liaoyang area of the eastern Liaoning were studied.The results show that LA-ICP-MS zircon U-Pb ages of Jianyi granite, Longchang meta-diabase and Suanpanyu meta-gabbro are (2 322±18), (2 335±21), (2 353±22)Ma, respectively;Jianyi Granite forms from partial melting of Archean crust, and belongs to metaluminous-calcalkaline I-type granite, and is enriched in large ion lithophile element (LILE), and is depleted in high field strength element (HFSE), showing the characteristics of magma in subduction zones;Longchang meta-diabase and Suanpanyu meta-gabbro belong to enriched mid-ocean ridge basalts (E-MORB) and have the geochemical characteristics of island arc;Longchang meta-diabase is generated from partial melting of Neoarchean mantle which is not very enriched, and the diabase is contaminated by juvenile crust during upwelling;Suanpanyu meta-gabbro is produced from partial melting of Paleoarchean-Mesoarchean enriched mantle;Liaoning-Jilin region is a continental back-arc basin in Early Paleoproterozoic, and the strong extension in the back-arc region results in partial melting of continental lithosphere, which generates the granites and meta-mafic rocks;these rocks are later metamorphosed, deformed and pushed together in later processes of terrane amalgamation.; 国家重点基础研究发展计划("九七三"计划)项目; 2; 143-160; 39
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/468559]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	李超,孙克克,陈斌. 辽东营口-辽阳地区古元古代花岗岩和变质基性岩形成时代及意义, Paleoproterozoic Granites and Meta-mafic Rocks from Yingkou-Liaoyang Area of the Eastern Liaoning and Their Significance[J]. 地球科学与环境学报,2017.
APA	李超,孙克克,&陈斌.(2017).辽东营口-辽阳地区古元古代花岗岩和变质基性岩形成时代及意义.地球科学与环境学报.
MLA	李超,et al."辽东营口-辽阳地区古元古代花岗岩和变质基性岩形成时代及意义".地球科学与环境学报 (2017).