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古代俯冲区的流体岩石相互作用过程,由墨西哥阿卡特兰高压低温复合体证明,墨西哥

Fabián Gutiérrez-Aguilar¹, Sofía Jiménez-Barranco², Peter Schaaf³

¹Facultad de Ingeniería, Universidad Nacional Autónoma de México, Ciudad de México 04360, Mexico. fabian.gutierrez.379@gmail.com.

Scientific reports

|April 8, 2025

概括

墨西哥阿卡特兰综合体的矿物质脱水引发了古生物沉降区的流体岩石相互作用. 这些相互作用改变了海洋地,影响了蓝石体内的流体迁移和转.

科学领域:

地质化学地质化学
石化学石化学是一门学科.
构造学构造学构造学构造学

背景情况:

降温区对于海洋地和地幔的相互作用,流体生成和挥发性物质的转移至关重要.
在俯冲区了解流体岩石相互作用,可以深入了解构造过程和物质循环.

研究的目的:

在墨西哥阿卡特兰综合体内的寒冷,成熟的古老沉降区研究流体岩石相互作用过程.
描述涉及到海底地低沉的流体的起源和演变.

主要方法:

蓝岩石,逆行生态岩石和石榴石含岩石的微量元素和Sr-Nd同位素分析.
岩石学和地化学建模,包括时间演变和流体岩石相互作用模型.
分析矿物质脱水反应和液体组成.

主要成果:

蓝岩石显示Pb和Sr的丰富,具有明显的同位素特征 (高87Sr/86Sr) 和元素比率 (低Ce/Pb,1/Pb).
沉积部分释放了富含Cs,Rb,Ba,Th,La,Pb,Sr和87Sr/86Sr的外部流体,而地形部分则产生了富含Cs,Pb和Sr的现场流体.
流体与岩石的相互作用发生在高压 (1.9-2.0 GPa) 和高温 (477-555 °C) 时,流体与叶子形成并行迁移.

结论:

阿卡特兰综合体中的矿物脱水在潜水过程中启动了显著的流体岩石相互作用.
外部和现场液体都起到了潜水海洋地的转化作用.
流体迁移是由系统扩张和透性变化控制的,蓝的特征证明了这一点.

关键词:

阿卡特兰综合体是阿卡特兰综合体.蓝天主义者是什么意思地化学建模地质化学建模采石学建模采石学建模中同位素的同位素.潜伏区是一个潜伏区.

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