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“大洋板块地层”的重建与意义——以藏南仲巴地区为例
引用本文:魏玉帅,李亚林,陈 曦,王成善,李祥辉,李 鑫,钟瀚涏.“大洋板块地层”的重建与意义——以藏南仲巴地区为例[J].地质通报,2015,34(10):1789-1801.
作者姓名:魏玉帅  李亚林  陈 曦  王成善  李祥辉  李 鑫  钟瀚涏
作者单位:1.中国地质大学地球科学与资源学院,北京 100083; 2.中国地质大学青藏高原地质研究中心,北京 100083; 3.南京大学地球科学系,江苏 南京 210000
基金项目:中国地质调查局项目(编号:1212011086037、 1212011121229)
摘    要:混杂岩是古增生楔存在的标志之一,一般由枕状玄武岩、灰岩、放射虫硅质岩、硅质页岩、砂岩等混乱无序组成。目前“大洋板块地层”(OPS)运用放射虫地层学方法对混乱的增生楔断片进行重建取得了良好效果,并清晰地展示了大洋板块俯冲和洋底物质连续增生的历史。在西藏仲巴地区填图过程中,结合放射虫年代学分析鉴定结果,以OPS重建的思路和理论作为指导,重建了仲巴地区混杂岩的大洋板块地层,并恢复了该区域特提斯洋在洋中脊大洋板块增生至消亡的岩石序列,自下而上分别为侏罗纪海山玄武岩、海山覆盖物侏罗系—白垩系碳酸盐岩、海山周围沉积的侏罗系—白垩系放射虫硅质岩和硅质页岩,以及海沟附近的白垩系陆源碎屑岩等,为特提斯洋大洋板块俯冲的方向、持续时间和古大地构造环境提供了信息。

关 键 词:放射虫硅质岩  海山  大洋板块地层  特提斯洋  仲巴  藏南

The reconstruction of oceanic plate stratigraphy and its implications: A case study of Zhongba area, southern Tibet
WEI Yushuai,LI Yalin,CHEN Xi,WANG chengshan,LI Xianghui,LI Xin,ZHONG Hanting.The reconstruction of oceanic plate stratigraphy and its implications: A case study of Zhongba area, southern Tibet[J].Geologcal Bulletin OF China,2015,34(10):1789-1801.
Authors:WEI Yushuai  LI Yalin  CHEN Xi  WANG chengshan  LI Xianghui  LI Xin  ZHONG Hanting
Institution:1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; 2. Research Center for Tibetan Plateau Geology, China University of Geosciences, Beijing 100083, China; 3. School of Earth Sciences, Nanjing University, Nanjing 210000, Jiangsu, China
Abstract:Mélange generally consists of such chaotic blocks as pillow lava, limestones, radiolarian cherts, siliceous shales and sandstones, which tectonically contact with each other. Mélange serves as a piece of evidence of the accretionary prism (AP) related to the subduction zones. Recently, by using radiolarian biostratigraphy, the theory of ocean plate stratigraphy (OPS) is referred to as an approach to the accretionary process of these blocks. In order to reconstruct the process of subduction and successive accretion of ocean floor material of Neo-tethys, the authors used the theory to mapping the accretionary prism related to the Yalung Zangbo suture zone in Zhongba area, southern Tibet. The OPS of AP in Zhongba area consists of Jurassic basalt of sea mountain, Jurassic-Cretaceous reefs on the sea mountain, the pelagic sediments such as siliceous shales and radiolarian cherts and the Cretaceous terrigenous clasts close to the trough. This study provides new information on the direction, duration and the tectonic settings of the subduction of the Neo-tethys Ocean.
Keywords:radiolarian cherts  seamount  oceanic plate stratigraphy  Tethys  Zhongba area  southern Tibet
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