| 张海东.山西平顺地区矽卡岩型铁矿床地质
特征及成矿物质来源探讨[J].地质与勘探,2010,46(4):634-642 |
| 山西平顺地区矽卡岩型铁矿床地质
特征及成矿物质来源探讨 |
| Geological Characteristics of Skarn Iron Deposits and TheirMineralization Material Source in the Pingshun Area, Shanxi Province |
| 投稿时间：2009-04-22 修订日期：2010-06-17 |
| DOI： |
| 中文关键词: 太行山南段平顺地区 早期 晚期侵入体 Pb 同位素 成矿物质来源 |
| 英文关键词: Pingshun area,Shanxi,early and later intrusive rocks,Pb isotopic,mineralization material source |
| 基金项目:全国危机矿山项目(编号:200614004),(编号:200899500)资助 |
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| 中文摘要: |
| [摘要]山西平顺地区矽卡岩型铁矿主要产于燕山期中性侵入岩与中奥陶统碳酸岩地层接触带
及其附近。矿化蚀变带明显,钠长石化是重要的找矿标志。北落峡ZK28-7 钻孔岩芯样地球化学特征、
黄铁矿(206 Pb/ 204 Pb=17郾741 ~18郾301,平均值17郾993;207 Pb/ 204 Pb =15郾433 ~ 15郾551,平均值15郾495) 以
及早期(206 Pb/ 204 Pb=17郾859 ~18郾474;207 Pb/ 204 Pb =15郾429 ~15郾431)和晚期侵入岩(206 Pb/ 204 Pb=17郾959
~18郾223,平均值18郾088;207 Pb/ 204 Pb =15郾434 ~15郾566,平均值15郾536)的Pb 同位素组成共同表明,除
晚期中性侵入岩是磁铁矿的成矿母岩之外,还包括早期超基性-基性侵入岩,它也是磁铁矿形成的重要
成矿母岩之一,其很可能是通过被晚期闪长岩同化交代,大量铁矿质进入了晚期闪长岩,经后期钠化蚀
变,铁质析出,形成磁铁矿,间接的提供物质来源。 |
| 英文摘要: |
| Abstract:The skarn-type iron deposits mainly occur in the contact zone between Yanshan intermediate rocks and Middle Ordovician carbonate rocks
in the Ping Shun area of Shanxi Province. The mineralization and alteration show pronounced zoning,and albitization is an important ore-hunting indicator.
The 208 Pb/ 204 Pb and 207 Pb/ 204 Pb 206 Pb/ 204 Pb ratios of pyrite are in the ranges of 17. 741 ~18. 301 (averaged 17. 993) and 15. 433 ~15. 551 (averaged
15. 495), respectively. The208 Pb/ 204 Pb and 207 Pb/ 204 Pb 、206 Pb/ 204 Pb ration of early intrusive rocks samples are 17. 859 ~ 18. 474,and 15. 429 ~ 15.
431,respectively,while later intrusive rocks samples are 17. 959 ~18. 223 (averaged 18. 088),and 15. 434 ~15. 566 (averaged 15. 536),respectively.
The Pb isotopic compositions of various kinds of samples from the deposit and the chemical composition of part 7th hole爷s core samples in Beiluoxia show
that the ore material of megnetite originated from intermediate intrusive rocks of the middle stage as well as ultramafic-mafic intrusive rocks of the early
stage. Ultramafic-mafic intrusive rocks are assimilated by intermediate rocks,leading to lots of iron entering the suldenite of late stage. The later sodic alter鄄
ation caused iron precipitation and then formation of magnetite,which served as the material source for mineralization indirectly.oic magma activity is related to paleopacific ocean plate subduction. |
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