| 硅质岩岩石化学研究方法及其在“镜铁山式”铁矿床中的应用 |
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| 引用本文： | 杨建民,王登红,毛景文,张作衡,张招崇,王志良.硅质岩岩石化学研究方法及其在“镜铁山式”铁矿床中的应用[J].岩石矿物学杂志,1999,18(2):108-120. |
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| 作者姓名： | 杨建民 王登红 毛景文 张作衡 张招崇 王志良 |
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| 作者单位： | 1. 中国地质科学院矿床地质研究所,100037,北京
2. 中国地质科学院地质研究所,北京,100037 |
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| 基金项目： | 国家计委科技找矿项目,地质矿产部定向科研项目 |
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| 摘 要： | 硅质岩研究是难度较大且目前又颇受重视的课题，岩石化学方法是研究其成因及成岩环境的重要手段。本文对常用的近２０种比值法、图解法作了初步检验，考察了其可行性。“镜铁山式”铁矿床产于北祁连造山带上元古代镜铁山群，应用上述方法对其岩石化学特征作了较全面的分析研究，认为铁矿床围岩中的石英岩具有生物成因硅质岩特征，主要来自地表风化作用，铁矿体中的铁碧玉岩具火成成因特征，来源于海底喷流。
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| 关 键 词： | 硅质岩 岩石化学 比值法 图解法 铁矿床 |
| 修稿时间： | 1999-03-05 |
The Petrochemical Research Method for Silicalite and Its Application to the "Jingtieshan Type" Iron Deposits |
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| YANG Jianmin,WANG Denghong,MAO Jingwen,ZHANG Zuoheng,ZHANG Zhaochong and WANG Zhiliang.The Petrochemical Research Method for Silicalite and Its Application to the "Jingtieshan Type" Iron Deposits[J].Acta Petrologica Et Mineralogica,1999,18(2):108-120. |
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| Authors: | YANG Jianmin WANG Denghong MAO Jingwen ZHANG Zuoheng ZHANG Zhaochong and WANG Zhiliang |
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| Abstract: | The study of silicalite is a rather difficult yet quite important subject, and the petrochemical method is an important means for studing its genesis and rock-forming environment. Based on a preliminary test of nearly twenty common ration methods and graphic methods, this paper has examined their feasibility. The "Jingtieshan type" iron deposits are distributed in Middle and Upper Proterozoic Jingtieshan Group in the western part of North Qilian Mountain, where tens of iron deposits(ore spots) have been disvovered. Among them, the Jingtieshan iron deposit is large-sized, and the Liugouxia and the Baijian iron deposits and belongs to grrenschist facies epimetamorphic rocks, with its bottom being medium-thick stratiform quartzite. Within the Jingtieshan type iron deposits there exists ferrojasper rock associated in banded form with specularite, and hence the study of the formation environment and genesis of ferrojasper rock means the study of the formation environment and genesis of Jingtieshan type iron deposits. The authors colleted ferrojasper rock samples and surrounding quartzite samples from the Huashuaguo and the Liugouxia iron deposit, used petrochemical research method for silicalite and compared the silicalite with typical silicalite in the world. The conclusions reaches are as follow:(1) the quartzite in wall rocks of the Jingtieshan type iron deposits shows character of biogenic silicalite and results mainly from surface weathering, while the ferrojasper rock in iron orebodies exhibits igneous character and is derived from submarine exhalation; (2) geochemical characteristics of quartzite and ferrojasper rock in Huashugou and Liugouxia demonstrate that these two iron deposits were formed in similar geological environments and should both belong to Jingtieshan type iron deposits. |
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| Keywords: | : silicalite Petrochemistry ratio method graphic meth od |
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