峨眉山地幔柱与岩石圈的相互作用及岩浆在岩石圈中运移过程的数值模拟

项目名称： 峨眉山地幔柱与岩石圈的相互作用及岩浆在岩石圈中运移过程的数值模拟

项目编号： No.41474083

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 白武明

作者单位： 中国科学院地质与地球物理研究所

项目金额： 120万元

中文摘要： 峨眉山玄武岩喷发及攀西裂谷的形成是晚古生代扬子板块西缘最重要的热构造事件，它也构成了晚古生代全球最显著的地幔柱活动之一。过去几十年我国地学研究人员已在地质、地球物理和地球化学等多方面对峨眉山地幔柱进行了研究，并取得了丰硕成果。本申请项目拟就地幔柱与岩石圈相互作用及岩浆在岩石圈中运移的动力学过程进行数值模拟的理论和方法研究，并应用到峨眉山地幔柱。研究将集中在两个方面：其一，研究峨眉山地幔柱形成后在上升到岩石圈底部与其相互作用，数值模拟地幔物质大规模运动造成的深部断裂及岩浆产生的过程以及地表隆升与沉降；其二，研究在什么力学和物理条件下，岩浆可从岩石圈底部侵入并在地壳内运移甚至上升到地表附近，探讨其规模和时限如何，同时给其运移过程以动态显示。本项目从地球动力学角度探讨峨眉山地幔柱这一重大的地质事件，并为该地区成矿环境及热动力学条件提供依据，具有十分重要意义。

中文关键词： 数值模拟；岩石圈；地幔柱；相互作用；岩浆运移

英文摘要： The eruption of basalt at the Emeishan and formation of rift valley at Panxi are most important thermal tectonic event on western of Yantze block in Late Paleozoic， which also is one of most notable activity of mantle plume over the world during the period. The plentiful achievements on research of the Emeishan mantle plume have been achieved from various aspects such as geology, geophysics and geochemistry by Chinese scientists in field of earth science. The applying project aims to study theory and method of numerical analysis on interaction between mantle plume and lithosphere and dynamic process of transportation of magma in lithosphere, and to take the Emeishan mantle as an example. The study will concentrate on two aspects: first, to study the interaction between the Emeishan mantle plume and lithosphere and to numerically simulate the process about formation of deep rift, production of magma and uplift or subsidence of surface; second, to study the condition of mechanics and physics on which magma may intrude into lithosphere from its bottom, transport in crust and even reach to nearby surface, to explore its change in space and time, and meanwhile to show the process in way of visualization. It has very important significance that this project explores the significant geological event of Emeishan plume from angle of geodynamics and offers an analytical basis on the minerogenetic environment and condition of thermal dynamics at the site.

英文关键词： Numerical simulation;Lithosphere;Mantal plume;Interaction;Magma transportation