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地表柯石英的实验室模拟合成及其形成机制的研究

DOI: 10.11858/gywlxb.2006.02.009, PP. 163-171

Keywords: 石英-柯石英,高能机械球磨,静高压,地球板块折返,Raman谱

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Abstract:

静高压合成柯石英的压力和温度的实验条件是提出地球板块折返假说的基础,然而,静高压没有反映局部碰撞和剪切应力的因素。考虑这些因素,提出了一种利用高能机械球磨与静高压相结合的、可以模拟地表柯石英合成的实验室研究方法,发现了一种由机械碰撞引起的α-石英中间亚稳相,其静高压致晶化成柯石英的条件为3.0GPa、923K、<1.0min。如果沿袭传统的板块折返假设,对应此条件的板块俯冲深度应比Jr.L.Coes的结果浅20km。发现了10s量级的柯石英的短时间快速合成现象。由本方法合成的柯石英的Raman峰,涵盖了以前得到的天然柯石英和人工合成的柯石英的Raman信息。阐明了由本方法合成的柯石英在地质科学上的涵义,并提出了另一种可能的地表柯石英形成机制。

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