钛粒硅镁石:冷俯冲带蛇纹岩超高压变质的特征变质矿物-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

钛粒硅镁石:冷俯冲带蛇纹岩超高压变质的特征变质矿物

Ti-chondrodite: A diagnostic mineral of ultra-high pressure metamorphism for serpentinites in cold subduction zones

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DOI	10.20086/j.cnki.yskw.2024.0211
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2024, 43(2)
作者	杨文宽，申婷婷*,
作者单位	1. 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所, 北京 100037; 2. 中国地质大学(北京) 地球科学与资源学院, 北京 100083
摘要	蛇纹岩矿物组合简单，主要组成矿物蛇纹石的温压稳定范围很大，这导致确定蛇纹岩的变质温压条件存在困难。本文通过实验岩石学模拟的方法，确定了钛粒硅镁石是蛇纹岩经历超高压变质的特征变质矿物。根据实验观察，压力达到3.0~3.5 GPa条件下，600~700℃范围内均存在钛粒硅镁石的生成反应，说明钛粒硅镁石在压力大于3.0~3.5 GPa条件下才能稳定；温度高于750℃，钛粒硅镁石开始减少直至消失。至于钛粒硅镁石的压力上限，由于实验条件所限，本次实验并未得出。钛斜硅镁石先于钛粒硅镁石出现，晚于钛粒硅镁石消失，稳定的温压范围更大。对实验样品观察发现，普遍存在钛粒硅镁石、钛斜硅镁石和橄榄石互为核边、互相交生的现象，这些实验现象与自然界中观察到的现象一致。低温高压条件下，由于这3类矿物结构的相似性，钛斜硅镁石与橄榄石通常出现互为核边的现象；随着温度升高，钛斜硅镁石以斑块或者片晶出现在橄榄石中，直至最终分解消失。钛粒硅镁石的出现与否取决于温压条件：低温低压条件下，钛粒硅镁石不稳定，发生分解产生钛斜硅镁石，出现钛斜硅镁石包裹钛粒硅镁石的现象；低温高压条件下，钛粒硅镁石稳定生长，出现钛粒硅镁石发育于钛斜硅镁石边部的现象；高温条件下，钛粒硅镁石不稳定，以片晶形式存在于橄榄石或钛斜硅镁石中。研究表明，钛粒硅镁石稳定于低温高压条件，确定其为冷俯冲带蛇纹岩超高压变质的标志。同时详细的岩相学显示了钛硅镁石矿物在高压变质过程中的行为，从而为俯冲带超基性岩变质研究提供理论依据。
Abstract	The simple mineral assemblage of serpentinite and the extensive thermobaric stability range of its primary mineral, serpentine, pose challenges in determining the thermobaric conditions of the serpentinite. This paper addresses this issue by utilizing high-pressure experiments, establishing that Ti-chondrodite serves as a diagnostic mineral for serpentinite undergoing ultra-high pressure metamorphism. Based on experimental observations, Ti-chondrodite is found to form within the temperature range of 600~700℃, reaching pressures of 3.0~3.5 GPa, signifying its stability at pressures exceeding 3.0~3.5 GPa. However, temperatures above 750℃ lead to a gradual reduction and eventual disappearance of Ti-chondrodite. The experimental conditions define the determination of the upper pressure limit for Ti-chondrodite. Ti-clinohumite typically forms earlier than Ti-chondrodite and persists longer, exhibiting a broader range of stability. In this experiment, a noteworthy observation is the intergrowth of Ti-chondrodite, Ti-clinohumite, and olivine. The observed phenomena in this experiment align with natural occurrences. Under the conditions of low temperature and high pressure, due to the similarity of the structure of these three types of minerals, Ti-clinohumite and olivine usually appear each other's nuclear edge. With the increase of temperature, Ti-clinohumite appears in olivine as patches or lamellae until it finally decomposes. The appearance of Ti-chondrodite depends on the temperature and pressure:under the conditions of low temperatures and low pressures, Ti-chondrodite is unstable and decomposes into Ti-clinohumite, then the phenomenon of Ti-chondrodite coated with Ti-clinohumite appeares; under the conditions of low temperatures and high pressures, the Ti-chondrodite becomes stable, and the Ti-chondrodite develops on the edge of Ti-clinohumite; at high temperatures, Ti-chondrodite is unstable and exists in the form of lamellae in olivine or Ti-clinohumite. This study establishes Ti-chondrodite as an indicator of ultrahigh-pressure metamorphism for serpentinites in cold subduction zones. Detailed petrographic investigations elucidate the behavior of titanium-humite minerals during the metamorphic process, offering a theoretical foundation for the examination of ultramafic rock metamorphism.
关键词	高温高压实验；蛇纹岩；钛粒硅镁石；钛斜硅镁石；变质反应
KeyWord	high pressure experiment; serpentinite; Ti-chondrodite; Ti-clinohumite; metamorphism
基金项目
页码	427-449

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杨文宽，申婷婷*. 钛粒硅镁石:冷俯冲带蛇纹岩超高压变质的特征变质矿物 [J]. 岩石矿物学杂志. 2024; 43; (2). 427 - 449.

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