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《工程(英文)》 >> 2019年 第5卷 第3期 doi: 10.1016/j.eng.2019.01.007

俯冲条件下纤蛇纹石的碳酸盐化

Department of Earth System Sciences, Yonsei University, Seoul 03722, Korea

Center for High Pressure Science and Technology Advanced Research, Shanghai 201203, China

收稿日期: 2018-08-02 修回日期: 2019-01-14 录用日期: 2019-01-28 发布日期: 2019-06-10

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摘要

为了解蛇纹石矿物在全球碳循环中的作用,我们以二氧化碳(CO2)为压力介质,对蛇纹石[Mg3Si2O5(OH)4]进行了高压X射线衍射(XRD)实验研究。同步辐射XRD图谱表明,在170 ℃和2.5(1) GPa条件下,样品加热1 h后形成了菱镁矿和纤蛇纹石高压相。Rietveld精修结果表明,在菱镁矿形成时,初始的纤蛇纹石晶胞组成变为Mg2.4(1)Si2O5(OH)2.4(1),这似乎是由于最内层羟基(OH3)的脱氢和M1位置上镁元素的重新排布,从而导致亚稳态单层脱羟基纤蛇纹石的形成。亚稳态纤蛇纹石压力和温度测量至5.0(1) GPa和500 ℃,这与苏门答腊南部和琉球俯冲带所在的莫霍板块地热温压条件相对应。在恢复到常温常压条件后,最初的纤维状纤蛇纹石已转变为土状。这些结果可以帮助我们了解沿俯冲带分布的深部碳循环作用过程,并可能促使设计利用压力和温度对石棉解毒的一种新方法。

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