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| 从华北陆块南缘大洋扩张到北秦岭造山带板块俯冲的转换时限 | |
| 引用本文： | 闫全人,王宗起,闫臻,王涛,张宏远,向忠金,姜春发,高联达.从华北陆块南缘大洋扩张到北秦岭造山带板块俯冲的转换时限[J].地质学报,2009,83(11):1565-1583. |
| 作者姓名： | 闫全人 王宗起 闫臻 王涛 张宏远 向忠金 姜春发 高联达 |
| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037 2. 中国地质科学院矿产资源研究所,北京,100037 3. 中国地质大学地球科学与资源学院,北京,100083 |
| 基金项目： | "十一五"国家科技支撑计划课题，国家自然科学基金项目，中国地质调查局项目，国土资源部"百人计划"项目(2004)资助的成果 |
| 摘 要： | 本文以北秦岭造山带华北陆块南缘被动陆缘火山裂谷(大洋?)盆地、早古生代岛弧-弧后盆地和晚古生代岛弧-蛇绿杂岩等构造相带为研究重点,综合利用同位素年代学、古生物年代学、岩石学、岩石地球化学和同位素地球化学等实测数据,系统研究和探讨了北秦岭造山带被动陆缘大洋扩张向俯冲增生造山转换的时限.研究显示:华北陆块南缘由晚新元古代大洋扩张作用转化为板块俯冲作用的转换时限为早奥陶世,约472Ma左右.北秦岭造山带在古生代期间至少存在两期板块俯冲增生造山作用,时代上向南变新,空间上向南向洋内迁移.两次俯冲增生造山作用分别构筑了北秦岭造山带早古生代岛弧-弧后盆地和晚古生代岛弧-俯冲杂岩两条构造相带. |
| 关 键 词： | 北秦岭 晚新元古代火山裂谷与大洋扩张 古生代俯冲增生造山作用 转换时限 |
| 收稿时间： | 3/5/2009 12:00:00 AM |
| 修稿时间： | 2009/9/11 0:00:00 |
Timing of the Transformation from Seafloor Spreading on the South Margin of the North China Block to Subduction within the North Qinling Orogenic Belt |
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| YAN Quanren,WANG Zongqi,YAN Zhen,WANG Tao,ZHANG Hongyuan,XIANG Zhongjin,JIANG Chunf,and GAO Lianda.Timing of the Transformation from Seafloor Spreading on the South Margin of the North China Block to Subduction within the North Qinling Orogenic Belt[J].Acta Geologica Sinica,2009,83(11):1565-1583. | |
| Authors: | YAN Quanren WANG Zongqi YAN Zhen WANG Tao ZHANG Hongyuan XIANG Zhongjin JIANG Chunf and GAO Lianda |
| Institution: | YAN Quanren1),WANG Zongqi2),YAN Zhen1),WANG Tao1),ZHANG Hongyuan3),XIANG Zhongjin1),JIANG Chunfa1),GAO Lianda1)1) Institute of Geology,Chinese Academy of Geological Sciences,Beijing,100037,2) Institute of Mineral resources,3) School of Geosciences and Resources,China University of Geosciences,100083 |
| Abstract: | This study examines the tectonic affinities and geochronology of three tectonic facies in the north Qinling orogenic belt,the volcanic rift or oceanic basin on the south margin of the north China block,early Paleozoic island arc-backarc basin assembledge,and late Palezoic island arc-subduction-related opiolitic melange,respectively,using integrated field observations,biochronologic,geochemical,isotopic,SHRIMP and LA-ICP-Ms zircon U-Pb analyses. The results in the study show that transformation from sea-floo... |
| Keywords: | north Qinling late Neoproterozoic rifting and sea-floor spreading subduction-accretion orogeny in the Paleozoic transformation time from spreading to subduction |
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