动态荷载下蓝晶石高压性质的原位拉曼光谱实验研究  

In-situ Raman spectroscopy study of the high-pressure properties of kyanite under dynamic loading

作　　者：赵霞 何明烨 梅升华 ZHAO Xia;HE Ming-ye;MEI Sheng-hua(Yazhou Bay Innovation Institute of Hainan Tropical Ocean University,Sanya Hainan 572000,China;School of Marine Science and Technology,Hainan Tropical Ocean University,Sanya Hainan 572022,China;Institute of Deep-sea Science and Engineering,Chinese Academy of Sciences,Sanya Hainan 572000,China)

机构地区：[1]海南热带海洋学院崖州湾创新研究院,海南三亚572025 [2]海南热带海洋学院海洋科学技术学院,海南三亚572022 [3]中国科学院深海科学与工程研究所,海南三亚572000

出　　处：《矿物岩石地球化学通报》2025年第1期21-27,I0002,共8页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：海南省自然科学基金青年基金项目(424QN274);2022年海南热带海洋学院崖州湾创新研究院重大科技计划项目(2022CXYZD003)。

摘　　要：蓝晶石在变质岩中具有温度和压力指示作用,而有关其高压相态和相态间转换的热力学边界研究尚存争议。本文运用动态金刚石压腔装置结合在线拉曼光谱分析技术,探究了常温(25℃)、高压(至20 GPa)下蓝晶石的相态行为。结果表明,在20 GPa以下的压力范围,蓝晶石一直以蓝晶石-Ⅰ的相态出现,未发生从-Ⅰ态到-Ⅱ态的相转变,而且不受实验荷载速率的影响;蓝晶石的Si-O对称弯曲振动的拉曼位移(υ_(2),485.4 cm^(–1))随压力的增大而呈线性变化:υ_(485.4)=1.9 P+487.6。这一特性可用于高压实验中的压力标定,将常用的通过拉曼光谱进行压力标定的标定范围从10 GPa扩展到20 GPa,这对高压科学研究具有一定的实用意义。Kyanite in metamorphic rocks acts as an indicator of temperature and pressure.However,there are some controversies in researches regarding its high-pressure phases and the thermodynamic boundaries of phase transitions.In this study,by employing a dynamic-loading diamond anvil cell combined with in-situ Raman spectroscopy,we have thoroughly investigated the phase behaviors of kyanite under high pressures(up to 20 GPa)at room temperature(25℃).The results indicate that with the pressures lower than 20 GPa,kyanite occurred and remained in form of the kyanite-I phase,without transitioning from the kyanite-I to kyanite-II phases,and is unaffected by the experimental loading rate.Additionally,it is found that the Raman shift of the Si-O symmetric bending vibration of kyanite(υ_(2),485.4 cm^(-1))is linearly changed with the increase of pressure:υ_(485.4)=1.9 P+487.6.This characteristic can be applied for the pressure calibration in high-pressure experiments,extending the common pressure calibration range using Raman spectroscopy from 10 GPa to 20 GPa,which has practical significance for the high-pressure scientific research.

关 键 词：蓝晶石 动态金刚石压腔 拉曼光谱 压标 相变 

分 类 号：P574.12[天文地球—矿物学]