西藏班公湖-怒江缝合带中段塔仁本洋岛型玄武岩的发现及地质意义  

The Tarenben oceanic-island basalts in the middle part of the Bangong-Nujiang suture zone, Xizang and their geological implications

作　　者：王忠恒[1] 王永胜[1] 谢元和 孙忠纲 鲁宗林 曲永贵[1] 李存直 姜雪飞[1] 

机构地区：[1]吉林省地质调查院,吉林长春130061

出　　处：《沉积与特提斯地质》2005年第1期155-162,共8页Sedimentary Geology and Tethyan Geology

基　　金：中国地质调查局"1:2 5万昂达尔错幅;帕度错幅"地质调查。

摘　　要：塔仁本洋岛型玄武岩是中特提斯洋古洋壳的重要组成部分,是班公湖怒江缝合带内构造混杂岩中局部有序部分的特殊洋壳残片。它以具有海底爆发相与远洋放射虫硅质岩相整合和大洋板内碱性玄武岩的构造环境为主要特征。它的发现丰富了班怒带的研究内容。The Tarenben oceanic-island basalts in Xizang occur as part of the Meso-Tethys oceanic crust and special remains of the oceanic crust from the tectonic mélanges in the middle part of the Bangong-Nujiang suture zone. These basalts are characterized by the tectonic settings of the oceanic within plate alkaline basalts in both the submarine eruptive facies and pelagic radiolarian silicalite facies. The discovery of the oceanic-island basalts has disclosed that there once existed the well-developed palaeo-oceanic crust in the Meso-Tethys.

关 键 词：西藏 班公湖-怒江缝合带 塔仁本洋岛型玄武岩 构造环境 古洋壳 地质意义 

分 类 号：P588.145[天文地球—岩石学]