山东蒙阴金伯利岩中铬铁矿电子探针波谱分析

doi:10.13686/j.cnki.dzyzy.2021.02.014

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摘要铬铁矿是金伯利岩型金刚石矿床中主要的指示性矿物之一.准确分析出铬铁矿化学组分中FeO、MgO、Cr₂O₃、Al₂O₃、TiO₂含量，不但对铬铁矿定名起决定性作用，对金伯利岩型金刚石矿床找矿也具有重要的指示意义.利用电子探针波谱技术对铬铁矿主量化学元素分析，通过所测样品微区化学成分含量推测矿物名称.25件单矿物样品微区化学成分分析结果统计显示：单矿物中主要化学成分FeO为15.666%~29.971%，MgO为7.286%~11.477%，Cr₂O₃为56.421%~71.111%；次要化学成分MnO为0.012%~0.382%，Al₂O₃为0.871%~8.993%，TiO₂为0.074%~3.375%.矿物化学成分总量为99.117%~100.877%，单矿物化学成分与铬铁矿化学组分相当.根据矿物人工重砂鉴定特征及A、B离子占位情况，可以确定所测样品为镁铬铁矿.

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	迟惠中
	王大千
	李经国
	伍月
	栗春玲
	张媛媛
	刘锦岫
	肇美晶

关键词 ：金伯利岩, 铬铁矿, 化学成分, 电子探针波谱, 微区分析, 山东省

Abstract：Chromite is one of the main indicator minerals in kimberlite diamond deposit. Accurate content analysis of the chemical compositions such as FeO, MgO, Cr₂O₃, Al₂O₃ and TiO₂ in chromite is the key for the naming of chromite, and significant indication for kimberlite diamond deposit prospecting as well. The electron probe spectroscopy is used to analyze the major chemical elements in chromite, and the micro-area chemical analysis of measured samples to infer the mineral name. The analysis results of 25 single mineral samples show that the contents of major chemical components are 15.666%-29.971% of FeO, 7.286%-11.477% of MgO and 56.421%-71.111% of Cr₂O₃, with minor chemical components MnO 0.012%-0.382%, Al₂O₃ 0.871%-8.993% and TiO₂ 0.074%-3.375%. The total mineral chemical composition is 99.117%-100.877%. The chemical composition of single mineral is equivalent to that of chromite. According to the mineral characteristics by artificial heavy mineral identification and positions of ion groups A and B, it can be determined that the measured sample is magnochromite.

Key words： kimberlite chromite chemical composition electron probe spectroscopy micro-area analysis Shandong Province

收稿日期: 2020-08-18

PACS:

P575.1

基金资助:国土资源部公益专项"金刚石矿床标型矿物的X射线衍射特征"项目（200811120）.

通讯作者: 王大千(1983-),男,工程师,现从事宝玉石鉴定工作,通信地址辽宁省沈阳市皇姑区北陵大街26甲3号,E-mail//27393081@qq.com E-mail: 27393081@qq.com

作者简介: 迟惠中(1992-),女,现从事宝玉石鉴定工作,通信地址辽宁省沈阳市沈河区西顺城街72号,E-mail//779133075@qq.com

引用本文:

迟惠中, 王大千, 李经国, 伍月, 栗春玲, 张媛媛, 刘锦岫, 肇美晶. 山东蒙阴金伯利岩中铬铁矿电子探针波谱分析[J]. 地质与资源, 2021, 30(2): 214-218.
CHI Hui-zhong, WANG Da-qian, LI Jing-guo, WU Yue, LI Chun-ling, ZHANG Yuan-yuan, LIU Jin-xiu, ZHAO Mei-jing. ELECTRON PROBE SPECTRUM ANALYSIS OF CHROMITE IN MENGYIN KIMBERLITES, SHANDONG PROVINCE. GEOLOGY AND RESOURCES, 2021, 30(2): 214-218.

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http://manu25.magtech.com.cn/Jweb_dzyzy/CN/10.13686/j.cnki.dzyzy.2021.02.014 或 http://manu25.magtech.com.cn/Jweb_dzyzy/CN/Y2021/V30/I2/214

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