| Organic Geochemistry Characteristics in Ores and Host Rocks from Qixiashan Lead-Zinc Deposit, Nanjing, China |
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| 作者姓名： | XieShucheng WangHongmei GuoJianqiu LiangBin ZhouXiugao |
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| 作者单位： | FacultyofEarthSciences,ChinaUniversityofGeosciences,Wuhan430074 |
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| 基金项目： | ThisworkisfinanciallysupportedbytheprojectoftheMinistryofEducationinChina . |
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| 摘 要： | Organic matter, associated with ores, host rocks, ore source rocks and present in fluid inclusions in the Qixiashan lead-zinc polymetailic deposit hosted in Upper Carboniferous dolomites and limestones in East China, was systematically analyzed using Fourier transform infrared spectroscopy, gas chromatography (GC), GC/mass spectrometry and proton-induced X-ray emission. The biomarker ratios of nC21^--/n22^ -alkanes, C23-tricydic/C30-hopane and the tricyclic terpane parameters induding C21/C23, C19-10/C21-29 and C19-25/C26-29 can effectively discriminate ores from host rocks. Extractable organic matter present in fluid inclusions displays similariUes to those enclosed in the ore source rocks in the biomarker ratios, suggesting that a proportion of orphic matter was introduced into the deposit from the ore source strata. The presence of copper and zinc in stage Ⅱ pyrobitumen indicates that some metals may have been transported by an organic fluid or removed from an aqueous fluid by organic matter.
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| 关 键 词： | 地球化学特征 矿石 沉积物 南京 |
Organic Geochemistry Characteristics in Ores and Host Rocks from Qixiashan Lead-Zinc Deposit, Nanjing, China |
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| XieShucheng WangHongmei GuoJianqiu LiangBin ZhouXiugao.Organic Geochemistry Characteristics in Ores and Host Rocks from Qixiashan Lead-Zinc Deposit, Nanjing, China[J].Journal of China University of Geosciences,2003,14(2):127-136. |
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| Authors: | Xie Shucheng Wang Hongmei GUO Jianqiu Liang Bin Zhou Xiugao |
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| Abstract: | Organic matter, associated with ores, host rocks, ore source rocks and present in fluid inclusions in the Qixiashan lead-zinc polymetallic deposit hosted in Upper Carboniferous dolomites and limestones in East China, was systematically analyzed using Fourier transform infrared spectroscopy, gas chromatography (GC), GC/mass spectrometry and proton-induced X-ray emission. The biomarker ratios of nC-21-/nC+22-alkanes, C23-tricyclic/C30-hopane and the tricyclic terpane parameters including C21/C23, C19-20/C21-29 and C19-25/C26-29 can effectively discriminate ores from host rocks. Extractable organic matter present in fluid inclusions displays similarities to those enclosed in the ore source rocks in the biomarker ratios, suggesting that a proportion of organic matter was introduced into the deposit from the ore source strata. The presence of copper and zinc in stage Ⅱ pyrobitumen indicates that some metals may have been transported by an organic fluid or removed from an aqueous fluid by organic matter. |
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| Keywords: | biometallogenesis biomineralization mineral deposit molecular fossil |
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