概括
波斯河奥斯陆裂中的热水流体变化是由石榴石化学揭示的. 氧同位素和微量元素的变化表明,岩石流体的主导地位从岩石流体转变为流星流体,可能与岩石变形有关.
科学领域:
- 地质化学 地质化学
- 同位素地球化学 同位素地球化学
- 石化学 石化学是一门学科.
背景情况:
- 石榴石晶体保留了反映生长条件的化学区分.
- 水热系统对于矿石的形成和岩石的改变至关重要.
- 波斯河奥斯陆裂为研究古代热水过程提供了一个自然实验室.
研究的目的:
- 为了研究波斯河奥斯陆裂水热系统的时间变化.
- 为了将石榴石的化学区分与流体演变和变形相关联.
- 了解流体流入对微量元素结合的影响.
主要方法:
- 石榴石的氧气同位素分析 ((18) O/ ((16) O比率)
- 在石榴石中测量和稀土元素 (REE) 丰度.
- 石榴石核心-边缘接口的微结构分析.
主要成果:
- 石榴石区划显示了对边缘的 (18) O/(16) O比率急剧下降.
- 这种同位素转移表明,流星流体涌入了一个由岩石主导的系统.
- 和光REE度在核心-边缘接口上增加.
结论:
- 观察到的石榴区划反映了热水流体组成的过渡.
- 从岩石流体转变为流星流体可能与脆性变形的开始相吻合.
- 微量元素的变化表明在脆性变形阶段对吸收的动力控制.
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