GYIG OpenIR  > 矿床地球化学国家重点实验室
Germanium isotopic systematics in Ge-rich coal from the Lincang Ge deposit, Yunnan, Southwestern China Research article
Hua-Wen Qi;  Olivier Rouxel;  Rui-Zhong Hu;  Xian-Wu Bi;  Han-Jie Wen
2011
Source PublicationChemical Geology
Volume286Issue:3-4Pages:252-265
Abstract

Organic matter plays an important role in the transport and precipitation of germanium (Ge) in coal-hosted Ge deposits. In this paper, Ge isotopes of coal samples and their combustion products were analyzed in order to investigate the potential use of Ge isotopes as tracers of Ge sources and enrichment mechanisms in coal. Germanium isotopic composition of various samples (mainly Ge-rich lignite) from the Lincang Ge deposit, Yunnan, Southwest China was analyzed using a continuous flow hydride generation system coupled to a Multi Collector Inductively Coupled Plasma Mass Spectrometer (MC-ICP-MS) and the standard-sample bracketing approach. Variations of 74Ge/70Ge ratios are expressed as δ74Ge values relative to NIST SRM 3120a Ge standard solution. Ge-rich lignite samples show large Ge isotopic fractionation (δ74Ge values range from − 2.59‰ to 4.72‰), and their δ74Ge values negatively correlate with Ge concentrations. Lignite samples with low Ge concentrations (< 500 ppm) tend to show positive δ74Ge values, while δ74Ge values of lignite samples with high Ge concentrations (> 1000 ppm) are close to zero or negative. Along stratigraphic sections, Ge is mainly concentrated in the top or the bottom of the coal seam, such that high values of δ74Ge are usually found in the middle part of the coal seam. Interlayered hydrothermal chert and limestone samples in Ge-rich coal seams also show moderate fractionation (δ74Ge values range from − 0.14‰ to 2.89‰ and from 0.55‰ to 1.87‰, respectively). The overall variations of δ74Ge values of Ge-rich lignite and organic-rich chert samples can be well described by a Rayleigh fractionation model, indicating that preferential enrichment of light Ge isotopes in coal in an open system might be the main factor controlling Ge fractionation in Ge-rich lignite. The germanium isotopic composition of hydrothermal chert (and possibly limestone) might also record the competitive fractionation produced by precipitation of quartz and sorption of coal. Elevated Ge concentrations and/or δ74Ge values of some chert, limestone, sandstone, and claystone samples may be attributed to the mixing with Ge-rich organic matter. Furthermore, similar to the fractionation of Zn, Cd and Hg isotopes observed between refinery dust or gas and slag, high temperature coal combustion also fractionates Ge isotopes, with the Ge isotopic compositions of soot being distinctly lighter (up to 2.25 per mil) than those of cinder. The distinct enrichment of potential hazardous elements (i.e., Pb, Cd, and As) and Ge in soot after coal combustion, as well as the common enrichment of Ge in sulfide minerals (e.g. sphalerite), highlights the possibility of using Ge isotopes as useful tracers of sources of heavy metal pollution caused by high temperature industrial processes (coal combustion and Pb-Zn refining) in the environment.

KeywordGermanium Coal Stable Isotope Fractionation Water–rock Interaction Geochemical Tracer
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7782
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Institut Universitaire Européen de la Mer (IUEM), Université Européene de Bretagne (UEB), IFREMER Dept. Géosciences Marines, Plouzané 29280, France
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Hua-Wen Qi;Olivier Rouxel;Rui-Zhong Hu;Xian-Wu Bi;Han-Jie Wen. Germanium isotopic systematics in Ge-rich coal from the Lincang Ge deposit, Yunnan, Southwestern China Research article[J]. Chemical Geology,2011,286(3-4):252-265.
APA Hua-Wen Qi;Olivier Rouxel;Rui-Zhong Hu;Xian-Wu Bi;Han-Jie Wen.(2011).Germanium isotopic systematics in Ge-rich coal from the Lincang Ge deposit, Yunnan, Southwestern China Research article.Chemical Geology,286(3-4),252-265.
MLA Hua-Wen Qi;Olivier Rouxel;Rui-Zhong Hu;Xian-Wu Bi;Han-Jie Wen."Germanium isotopic systematics in Ge-rich coal from the Lincang Ge deposit, Yunnan, Southwestern China Research article".Chemical Geology 286.3-4(2011):252-265.
Files in This Item:
File Name/Size DocType Version Access License
Germanium isotopic s(1447KB)期刊论文作者接受稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Hua-Wen Qi;Olivier Rouxel;Rui-Zhong Hu;Xian-Wu Bi;Han-Jie Wen]'s Articles
Baidu academic
Similar articles in Baidu academic
[Hua-Wen Qi;Olivier Rouxel;Rui-Zhong Hu;Xian-Wu Bi;Han-Jie Wen]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Hua-Wen Qi;Olivier Rouxel;Rui-Zhong Hu;Xian-Wu Bi;Han-Jie Wen]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Germanium isotopic systematics in Ge-rich coal from the Lincang Ge deposit, Yunnan, Southwestern China.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.