山西代县金红石矿中两类矿石的岩相学及矿物学研究

现代地质 ›› 2007, Vol. 21 ›› Issue (Suppl): 41-48.

山西代县金红石矿中两类矿石的岩相学及矿物学研究

贾琇明^{1, 2}，李胜荣¹，庞尔成³，施光海¹ ，吴振¹ ，李孔亮¹

1中国地质大学地质过程与矿产资源国家重点实验室，北京100083；
2太原理工大学，山西太原030024；3山西地勘局忻州211地质队，山西忻州034000

收稿日期:2006-11-07 修回日期:2006-12-15 出版日期:2007-08-20 发布日期:2007-08-20
作者简介:贾琇明，女，教授，博士研究生，1956年出生，矿物学、岩石学、矿床学专业，主要从事遥感地质和矿山地质的教学和研究工作。
基金资助:
国土资源部山西省国土资源厅项目

Petrograph and Mineralogy of Two Types of Ore From the Daixian Rutile Deposit, Shanxi, China

JIA Xiu-ming^1,2,LI Sheng-rong¹, PANG Er-cheng³, SHI Guang-hai¹, WU Zhen¹, LI Kong-liang¹

1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China;
2Taiyuan University of Technology, Taiyuan, Shanxi030024, China;
3211 Branch, Survey & Developing Bureau of Geology and Resource, Xinzhou, Shanxi034000, China

Received:2006-11-07 Revised:2006-12-15 Online:2007-08-20 Published:2007-08-20

摘要/Abstract

摘要：

山西代县金红石矿是我国第二大金红石矿，按金红石颜色可分为红色金红石矿与黑色金红石矿2类，红色金红石矿一般位于矿体的上部，黑色金红石矿则位于矿体的下部。这2种矿石矿物在组合上存在明显的不同，红色金红石矿中矿物组合为：直闪石+斜长石+金红石+镁角闪石+碱性长石；黑色金红石矿的矿物组合为：直闪石+金云母+绿帘石+金红石。根据岩相学观察，认为红色金红石矿中存在反应：镁角闪石+碱性长石→直闪石+/-斜长石+/-金云母(?)，斜长石很可能只是过渡相，反应最终将形成直闪石+金云母(?)。黑色金红石矿中的矿物组合可能是进行得更为彻底的上述反应结果。红色金红石矿中金红石成分均匀，未见有钛铁矿的出溶现象，黑色金红石矿中金红石存在明显的厚度大于2 μm的钛铁矿出溶叶片。认为正是这种出溶叶片导致上述2种矿石出现颜色差异。目前的资料表明该矿为角闪岩相的变质岩，但要确定该金红石矿的原岩属性还需要更深入研究。上述研究结果对于帮助指导该矿的开采、选矿与利用均有一定意义。

关键词: 金红石矿, 角闪岩相, 直闪石, 钛铁矿, 山西代县

Abstract:

According to colour of rutile, ores of the Daixian rutile deposit, the second biggest rutile deposit in China, can be classified into two types: red and black ore; the red ore generally occurred at upper part of the deposit, overlying the black ore without distinct border. These two ores have contrasting mineral associations: anthothyllite (Ath)+plagioclase(Pl)+rutile(Rut)+magnesiohornblende(Mhb)+alkline fledspar (Afs) for red ore and anthothyllite+phlogopite(Phl)+epsode(Ep)+Rutile for black ore. A chemical reaction was suggested as Mhb+Afs→Ath+/-Pl+/-Phl(?)based on petrographical observations in red rutile ore, Pl is possibly the transitional phase and complete reactants are Ath + Phl (?). The mineral associations of black ore is thus inferred to be more complete reactants of this reaction. As for rutiles, red rutiles are homogeneous in composition while black ones bear ilmenite exsolution lamellae of up to 2 μm in thickness. We concluded that it is the existence of the lamellae that causes color difference between these two rutiles. The rutile-hosted rocks are metamorphic rocks with amphibolite face, but more work should be done to discuss features of their protolith. This investigation have implications for better mining, selecting and utilizing this deposit.

Key words: rutile deposit, amphibolite face, anthothyllite, ilmenite, Daixian, Shanxi

中图分类号:

P578.4⁺7

贾琇明，李胜荣，庞尔成，施光海，吴振，李孔亮. 山西代县金红石矿中两类矿石的岩相学及矿物学研究[J]. 现代地质, 2007, 21(Suppl): 41-48.

JIA Xiu-ming,LI Sheng-rong, PANG Er-cheng, SHI Guang-hai, WU Zhen, LI Kong-liang. Petrograph and Mineralogy of Two Types of Ore From the Daixian Rutile Deposit, Shanxi, China[J]. Geoscience, 2007, 21(Suppl): 41-48.