项目名称: 塔里木克拉通东北缘早古生代大陆碰撞和造山作用:敦煌地块高压麻粒岩的岩石地球化学研究
项目编号: No.41203027
项目类型: 青年科学基金项目
立项/批准年度: 2013
项目学科: 地球化学
项目作者: 宗克清
作者单位: 中国地质大学(武汉)
项目金额: 26万元
中文摘要: 高压麻粒岩为我们研究大陆俯冲、碰撞和造山作用提供了难得的天然实验样品。敦煌地块位于塔里木克拉通东北缘,目前的研究普遍认为敦煌地块是塔里木克拉通的重要组成部分。申请者最近在该区发现了早古生代高压基性麻粒岩。本研究拟对敦煌地块新发现的高压麻粒岩开展详细的P-T-t轨迹和原岩恢复等岩石地球化学工作。通过与周边造山带(北山、阿尔金和北祁连)早古生代高压麻粒岩和榴辉岩的对比,深入探讨塔里木克拉通东北缘早古生代的大陆碰撞和造山作用,深化我们对塔里木克拉通构造演化的认识。
中文关键词: 敦煌地块;高压基性麻粒岩;大陆碰撞;弧后盆地玄武岩;中亚造山带
英文摘要: High-pressure (HP) granulite plays a key role in the understanding of the continental subduction and collision during orogenic evolution. The Dunhuang block, located at the northeast region of the Tarim Craton, is always considered as an important constituent of the Tarim Craton. Recently, we first found early Palaeozoic HP mafic granulite in the Dunhuang block. In order to reveal their P-T-t path and protolith, this study will carry out detailed petrological and geochemical study on these HP granulites. Lastly, through a comparison of the Dunhuang HP granulite with the early Palaeozoic HP granulite and eclogite in the surrounding orogens (Beishan, Altyn Tagh and North Qilian), the early Palaeozoic continental collision in the northeastern Tarim Craton will be discussed.
英文关键词: Dunhuang block;high-pressure mafic granulite;continental collision;back-arc basin basalt;Central Asian Orogenic Belt