超慢速洋中脊岩浆作用的数值模拟

发布时间：2018-02-27 08:45

本文关键词： 超慢速扩张洋中脊热点岩浆房热力学过程有限元方法　出处：《地球物理学进展》2017年05期 　论文类型：期刊论文

【摘要】：为了验证西南印度洋中脊50°E区域的残留熔融体与8~11 Ma前的岩浆供给活动的相关性,用有限元方法对洋壳模型进行热力学数值计算,以期解答超慢速洋中脊热液活动是由于古岩浆房长期持续供热,还是依赖周边热点提供持续的岩浆和热融熔问题.实验模拟了水平层状洋壳模型和地震试验得到的实际洋壳模型两种情况,对水平层状洋壳模型研究了上地幔有、无持续岩浆供给两种情况,对实际洋壳模型研究了一次岩浆供给的情况.结论如下:如果洋壳层底部没有持续热供应,岩浆房持续时间约为数千年或数万年;西南印度洋中脊中东段隆起区的热液活动和岩浆房最多持续存在0.8 Ma,现今热液活动的热源并不是8~11 Ma前的岩浆供给提供的.
[Abstract]:In order to verify the correlation between magma supply activities in southwest India ocean ridge in the 50 ~ E region of the residual melt and 8~11 before Ma, by the method of the finite element numerical calculation of thermodynamic model of oceanic crust, ridge hydrothermal activity to solve the super slow ocean is due to the ancient magma chamber continuously heating, or rely on the surrounding hotspots continuous magma and heat melting. Experimental simulation of actual ocean crust model of horizontal layered ocean shell model and seismic test of two cases of horizontal layered model of oceanic crust of upper mantle, two cases without sustained magma supply, the actual ocean crust model of a magma supply situation. The conclusion is as follows: if the ocean bottom shell without heat supply, magma duration is about thousands of years or tens of thousands of years; hydrothermal activity and magma chamber in southwest India ocean ridge in the Middle East section of uplift area for up to 0.8 Ma, The heat source of today's hydrothermal activity is not provided by the supply of magma before 8~11 Ma.

【作者单位】：国家海洋局第二海洋研究所国家海洋局海底科学重点实验室;国土资源部海底矿产资源重点实验室;中国科学院大学计算地球动力学重点实验室;
【基金】：国土资源部海底矿产资源重点实验室开放基金(KLMMR-2014-B-07,KLMMR-2014-B-08) 国家海洋局第二海洋研究所基本科研业务费(JG1509,QNYC201601) 国际海域资源调查与开发“十二五”课题(DY125-22-QY-03) 国家自然科学基金(41506048)联合资助
【分类号】：P736

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