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东海晚中生代岩浆弧与陆缘汇聚作用:碎屑锆石U-Pb年代约束
投稿时间:2019-01-27  修订日期:2019-04-03  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2019162
摘要点击次数: 115
全文下载次数: 147
作者单位E-mail
李晓龙 同济大学海洋与地球科学学院 1632968@tongji.edu.cn 
许长海 同济大学海洋与地球科学学院 xchxch@tongji.edu.cn 
高顺莉 中海石油中国有限公司上海分公司  
黄湘通 同济大学海洋与地球科学学院  
赵洪 中海石油中国有限公司上海分公司  
张成晨 同济大学海洋与地球科学学院  
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)资助
中文摘要:晚中生代是古太平洋板块俯冲东亚大陆的重要时期。本文通过东海陆架盆地紧邻海礁 隆起的ECSs611钻井渐新世花港组(1626~1638m)和白垩系(1638~1689m)碎屑锆石研究,获得了~163Ma和~120Ma两期岩浆-变质事件的U-Pb年龄记录。两期岩浆锆石均具有低温(556~732℃)、流体活动元素U 富集(82~3412ppm)及高场强元素Nb亏损(0.6~13.8ppm)等特点,它们形成于岩浆弧构造环境。两期岩浆锆石都属于大陆锆石类型,其它碎屑锆石年龄(元古代以来)与华南大陆主要构造事件一致,初步认为海礁隆起应属于华南大陆东延的部分。如果将海礁-虎皮礁隆起作为岩浆弧一部分,与东海福州凹陷弧前盆地和SW日本到台湾俯冲增生杂岩等单元联结起来,区域上可构成受古太平洋板块俯冲控制的晚中生代东亚大陆边缘构造轮廓,即岩浆弧?弧前盆地?俯冲增生杂岩。
中文关键词:岩浆弧  晚中生代  碎屑锆石  U-Pb年代  东海
 
Late Mesozoic magmatic arc of continental margin: constraints from detrital zircon U-Pb data, East China Sea
Author NameAffiliationE-mail
Li Xiaolong School of Ocean and Earth Science, Tongji University 1632968@tongji.edu.cn 
Xu Changhai School of Ocean and Earth Science, Tongji University xchxch@tongji.edu.cn 
Gao Shunli CNOOC China Limited-Shanghai  
Huang Xiangtong School of Ocean and Earth Science, Tongji University  
Zhao Hong CNOOC China Limited-Shanghai  
Zhang Chengchen School of Ocean and Earth Science, Tongji University  
Abstract:The Late Mesozoic is an important tectonic period for subduction of Paleo-Pacific slab beneath East Asia. Sandstones from the Well ECSs611 closely adjoining the Haijiao Uplift from the East China Sea are focused in order to trace late Mesozoic magmatic arc in terms of records of detrital zircons. Detrital zircons are selected for U-Pb isotopic dating from Oligocene Huagang Formation (1626-1638m) and Cretaceous (1638-1689m) sandstones. Results show that the detrital zircons from Huagang Formation and Cretaceous samples are mainly magmatic zircons with some metamorphic ones that formed in two episodes of ~163Ma and ~120Ma respectively, registering two late Mesozoic magmatic-metamorphic events. These magmatic zircons which were from arc-related magmatic source are characterized by low–temperature (556~732℃), enrichment of fluid-mobile U (82~3412ppm) and high field-strength Nb depletion (0.6~13.8ppm). These magmatic zircons are continental not oceanic, while other ages form detrital zircons (since Proterozoic) are consistent with key tectonic events that the South China block underwent. It is inferred that the Haijiao uplift zone belongs to eastward extension of South China. The Haijiao-Hupijiao zone if as a magmatic arc, with units of the Fuzhou forearc basin and SW Japan-Taiwan subduction accretionary complex, together constitutes an outline of late Mesozoic continental margin of East China Sea, controlled by the subduction of paleo-Pacific slab.
keywords:Magamatic arc  Late Mesozoic  U-Pb geochronology  Detrital zircon  East China Sea
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