高温高压下石榴斜长角闪岩的热物理性质研究及其对岩石圈热结构的约束  

Thermal properties of garnet-bearing amphibolite at high temperature and pressure and its impact on the thermal structure of the lithosphere

作　　者：马玮宇 易丽[1] 王多君 张瑞鑫 韩珂楠 张瑞 魏靓 薛攀明 唐学武 MA WeiYu;YI Li;WANG DuoJun;ZHANG RuiXin;HAN KeNan;ZHANG Rui;WEI Liang;XUE PanMing;TANG XueWu(United Laboratory of High-Pressure Physics and Earthquake Science,Institute of Earthquake Forecasting,CEA,Beijing 100036,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Hunan Earthquake Agency,Changsha 410001,China)

机构地区：[1]中国地震局地震预测研究所高压物理与地震科技联合实验室,北京100036 [2]中国科学院大学地球与行星科学学院,北京100049 [3]湖南省地震局,长沙410001

出　　处：《地球物理学报》2025年第2期609-622,共14页Chinese Journal of Geophysics

基　　金：国家自然科学基金项目(42374211,91958216)资助

摘　　要：高温高压下矿物和岩石的热导率与热扩散系数可以为地质过程的热演化历史模拟提供数据支撑,同时也是建立稳定状态下的深部圈层热结构的必要参数.本文选取下地壳中具备较高代表性的石榴斜长角闪岩,利用基于六面顶压机上的瞬态平面热源法测试系统,测量了其在0.5~1.5 GPa、300~973 K下的热导率与热扩散系数,结果发现热导率和热扩散系数随温度增加而降低,随压力增加而升高,温度对热导率和热扩散系数的影响远大于压力的影响.在固定压力下,热导率和热扩散系数随温度的变化最大可达40%,在固定温度下,压力对热导率和热扩散系数的影响最大可达23%.利用实验获得的数据,结合前人的高温高压数据与热岩石圈模型参数,计算了不同地表热流下华北克拉通不同区域的热岩石圈厚度范围.The thermal conductivity and thermal diffusivity of minerals and rocks under high temperature and pressure can provide data supporting for historical simulation of geological processes,and they are also necessary parameters for establishing the thermal structure of deep layer under a stable state.In this paper,the thermal conductivity and thermal diffusivity of a representative garnet-bearing amphibolite sample in the lower crust were measured via the transient plane-source method at 0.5~1.5 GPa and 300~973 K using a cubic-anvil high-pressure apparatus.The experimental results show that the thermal conductivity and thermal diffusivity decrease with temperature and increase with pressure.The influence of temperature on thermal conductivity and thermal diffusivity is much greater than that of pressure.At a given pressure,the thermal conductivity and thermal diffusivity can change with temperature by up to 40%,and at a given temperature,the change of the thermal conductivity and thermal diffusivity with pressure can reach up to 23%.Combining high-temperature and high-pressure data from previous studies as well as this study and the parameters of the thermal lithosphere model,the thickness of the thermal lithosphere in different regions of the North China Craton under different surface heat flows was calculated.

关 键 词：高温高压 石榴斜长角闪岩 热导率 热扩散系数 热岩石圈厚度 

分 类 号：P314[天文地球—固体地球物理学]