河南鹤壁地区地幔包体特征及内部NAMs的含水量研究  

A Study on the characteristics and NAMs water contents of mantle xenoliths in the Hebi area, Henan Province, China

作　　者：袁稳 侯广顺[1,2] 张艳林 姜江 魏世鹏 齐永安 YUAN Wen;HOU Guang-shun;ZHANG Yan-lin;JIANG Jiang;WEI Shi-peng;QI Yong-an(Henan Polytechnic University,College of Resources and Environment,Jiaozuo 454000,China;Nonferrous Metal Geological Prospecting Institute of Henan Province,Zhengzhou 450052,China)

机构地区：[1]河南理工大学资源环境学院,河南焦作454000 [2]河南省有色金属地质勘查总院,河南郑州450052

出　　处：《矿物学报》2022年第1期29-39,共11页Acta Mineralogica Sinica

基　　金：国家自然科学基金项目(编号:41773024,21507145);河南省科技厅科技公关项目(编号:172102210331)。

摘　　要：地幔包体作为研究岩石圈深部过程的直接对象,其内部"名义无水矿物"(NAMs)的地球化学和含水量特征,以及所在的地质背景、产出位置等为揭示岩石圈地幔演化提供了重要途径。河南鹤壁位于华北活化克拉通与稳定克拉通之间的过渡带上,区内出露的超基性、基性岩体中含有丰富的地幔包体,为研究过渡带中上地幔的温、压条件及含水量特征等提供了重要的窗口。本文通过EMPA和Micro-FTIR手段,对地幔包体中NAMs的主量元素和红外吸收光谱进行观测,利用各种地质温压计以及Beer-Lamber含水量分析方法对这些数据进行处理,得到了不同深度来源的地幔包体当时所处的温、压条件,地球化学属性以及内部NAMs所对应的含水量等信息,为研究鹤壁地区与世界各地不同地质背景下NAMs的含水量差别以及NAMs的含水量与地球化学元素之间的相关性提供了重要线索。The mantle xenolith is a direct object for studying the deep process of the lithosphere. The comprehensive study on the geochemical and water-bearing characteristics of the internal nominal anhydrous minerals(NAMs), geological tectonic setting, and output location of the mantle xenoliths provides an important way to reveal the evolution of the lithospheric mantle. The Hebi area in Henan Province is located in the transition zone between the destroyed and stable parts of the North China Craton. The research of mantle xenoliths contained in exposed ultra-basic and basic rocks in the Hebi area provides an important window for studying the temperature and pressure conditions as well as water content characteristics of the upper mantle in the transition zone. In this paper, we have carried out the analysis of major elements and infrared absorption spectra of the NAMs in mantle xenolith by using EMPA and FTIR methods, then processed those obtained data by using various geothermal thermometers and the Beer-Lamber water content analysis method, and finally obtained various informations of the temperature and pressure conditions, geochemical properties, and water contents of the internal NAMs in mantle xenoliths sourced from different depth of the mantle. These informations have provided important clues for studying the difference between water contents of the NAMs in mantle xenoliths of the Hebi area and those of the NAMs in mantle xenoliths occurred in different geological backgrounds around the world and the correlation between water contents and geochemical elements of the NAMs in those mantle xenoliths.

关 键 词：地幔包体 名义无水矿物 微量结构水 地幔温压 

分 类 号：P574.1[天文地球—矿物学]