| 沂蒙矿种新成员——新矿物钙沂蒙矿亚种的发现及产出特征 |
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| 引用本文： | 陆琦,刘惠芳,肖平.沂蒙矿种新成员——新矿物钙沂蒙矿亚种的发现及产出特征[J].地质科技情报,2007,26(2):1-7. |
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| 作者姓名： | 陆琦 刘惠芳 肖平 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,武汉,430074 |
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| 摘 要： | 沂蒙矿是中国1980年发现的新矿物,采用电子探针对采自山东蒙阴金伯利岩胜利一号小岩管中的沂蒙矿类矿物进行了分析,确定了沂蒙矿的Ca端元矿物--钙沂蒙矿(暂定名),是又一个被确定的新矿物.该新矿物简化的矿物化学式为:Ca0.5～1.0(Fe,Mg,Cr,Ti)14～15O19.钙沂蒙矿与(K)沂蒙矿、富钡沂蒙矿共生,沿镁钛矿-尖晶石出溶体呈板片状条带分布,均为交代成因.3种不同成分的沂蒙矿颗粒均十分细小,颗粒总数达100粒左右,但钙沂蒙矿产出不多.与其他沂蒙矿不同,钙沂蒙矿在结晶学A位置上几乎全为Ca,少有其他大阳离子;在结晶学B位置上二价阳离子(Fe2 、Mg)占三分之二.最后从沂蒙矿晶体结构的角度讨论了钙沂蒙矿在自然界不易产出的原因.
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| 关 键 词： | 新矿物 钙沂蒙矿 交代成因 |
| 文章编号： | 1000-7849（2007）02-0001-07 |
| 修稿时间： | 2007-01-08 |
Ca-Yimengite, Another New Mineral in Kimberlite, Shandong Province |
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| LU Qi,LIU Hui-fang,XIAO Ping.Ca-Yimengite, Another New Mineral in Kimberlite, Shandong Province[J].Geological Science and Technology Information,2007,26(2):1-7. |
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| Authors: | LU Qi LIU Hui-fang XIAO Ping |
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| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences , Wuhan 430074, China |
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| Abstract: | Yimengite was first found in China in 1980,while hawthorneite was reported by Haggerty et al.as the Ba end member of yimengite in 1989 and translated into Chinese as Ba-yimengite.This paper confirms another new mineral in kimberlite,the Ca end member of yimengite,a term named temporarily,is discovered in Shandong Province,China.According to the main elements in site A and B in AB12O19,the confirmed minerals in yimengite series include K-Cr-yimengite(yimengite,1983),Ba-Cr-yimengite(hawthorneite),K-Ti-yimengite(reported in 1994),Ba-Ti-yimengite(reported in 1994) and Ca-Fe-yimengite(Ca-yimengite,this study).The simplified chemical formula of this new mineral,Ca-yimengite,is Ca0.5-1.0(Fe,Mg,Cr,Ti)14-15O19,which intergrows with yimengite(K end member) and Ba-yimengite.These three kinds of yimengite are all products of metasomatism and are linearly distributed over the geikielite in which there are exsolution lamellaes of spinel.In the geikielite,about 100 tiny yimengite particles are found,among which the number of Ca-yimengite is relatively small.Different from other yimengite,Ca2+ but not other cation occupies site A,and bivalent cations such as Mg2+,Fe2+,occupy 2/3 site B in the crystal structure of Ca-yimengite.The paper discusses the reason for the seldom occurrence of the Ca-yimengite in nature in terms of the crystal chemistry of Ca-yimengite. |
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| Keywords: | new mineral Ca-yimengite product of metasomatism |
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