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东海晚中生代岩浆弧和板块俯冲:FZ211井碎屑锆石的约束
投稿时间:2020-01-19  修订日期:2020-05-20  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020093
摘要点击次数: 22
全文下载次数: 26
作者单位E-mail
斯琴 同济大学 1731664@tongji.edu.cn 
许长海 同济大学 xchxch@tongji.edu.cn 
高顺莉 中海石油(中国)有限公司上海分公司  
基金项目:国家自然科学基金项目(批准号: 41876045)和国家科技重大专项课题(批准号: 2017ZX05005001-005)
中文摘要:晚中生代是古太平洋板块俯冲东亚陆缘的重要时期,也是华南大陆岩浆活动的重要时期。本文选用东海陆架丽水凹陷中FZ211井紧邻中生代花岗岩基底的石门谭组(2031~2097m)和明月峰组(1755~1806m)的砂岩样品开展碎屑锆石U-Pb同位素和微量元素等分析,获得侏罗纪(180~160Ma)和白垩纪(140~80Ma)两期主要的岩浆事件记录,而且以120-80Ma年龄组分更为发育。这两期岩浆锆石均具有结晶温度低(605~792℃),流体活动元素U、Th和LREE富集以及高场强元素Nb、Ta、Ti和HREE亏损特点,它们形成于典型的岩浆弧构造环境,岩浆中侏罗纪俯冲物质的加入明显优于白垩纪;与洋壳锆石相比,两期岩浆锆石U/Yb(0.1~5.1)与大陆锆石类型一致,白垩纪岩浆锆石显现向洋壳锆石过渡的趋势。东海渔山隆起应属于晚中生代大陆岩浆弧的重要组成部分,120~80Ma是俯冲和岩浆活动的强烈时期,东亚陆缘从侏罗纪到白垩纪显现出古太平洋板块俯冲回滚的特点。如果将渔山隆起岩浆弧与福州凹陷弧前盆地和SW日本到台湾的俯冲杂岩联结起来,区域上可构成晚中生代东亚陆缘汇聚的构造轮廓,即岩浆弧-弧前盆地-俯冲增生杂岩。
中文关键词:东海  碎屑锆石  岩浆弧  晚中生代  东亚汇聚
 
Late Mesozoic magmatic arc of East China Sea developed with plate subduction: constraints from detrital zircons of well FZ211
Author NameAffiliationE-mail
siqin Tongji university 1731664@tongji.edu.cn 
xuchanghai Tongji university xchxch@tongji.edu.cn 
gaoshunli CNOOC China Limited-Shanghai, Shanghai  
Abstract:The late Mesozoic was an important period of subduction of the paleo-Pacific Plate to develop the East Asian continental margin intensively with magmatic activity in the South China block. In this paper, the sandstone samples of Shimentan formation (2031~2097 m) and Mingyuefeng formation (1755~1806 m) that closely adjoin the Mesozoic granite basement were selected from the well FZ211 in Lishui sag, East China sea, for the analysis of detrital zircon U-Pb isotopes and trace elements. We obtained the evidence of two major magmatic events that activated in Jurassic(180~160Ma)and in Cretaceous (140~80Ma),respectively, in which an age range of 120-80 Ma occurred as a major age component. The dated detrital zircons from two episodes of magmatism are characterized by low temperature (605~792℃), fluid-mobile element U, Th, and LREE enrichment, and high field-strength element Nb, Ta, Ti, and HREE depletion. They were formed in a typical magmatic arc tectonic environment. Compared with the oceanic-type zircon, the U/Yb ratios (0.1~5.1) of dated igneous zircons fall the range of the continental-type zircon, but showing a transitional trend towards the type of oceanic zircon in the Cretaceous. The Yushan uplift from the East China Sea, as a sediment provenance for the dated samples, should be an important part of the late Mesozoic magmatic arc, with a period of 120-80Ma strongly for subduction and magmatic activity. The Yushan magmatic arc, if connected with units of the Fuzhou forearc basin and SW Japan-Taiwan accretionary complexes, constitutes an architecture of late Mesozoic continental margin of East China Sea, controlled by the subduction of Paleo-Pacific slab rollback.
keywords:East China Sea  Detrital zircon  Magmatic arc  Late Mesozoic  East Asian convergence
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