{"title":"Origin of light hydrocarbon gases from the Matsukawa geothermal area in Japan","authors":"Yasuhiro Kiyosu , Noriko Asada , Yutaka Yoshida","doi":"10.1016/0168-9622(92)90007-W","DOIUrl":null,"url":null,"abstract":"<div><p>Light hydrocarbon and isotope compositions of methane were analyzed in well steam samples from the Matsukawa vapour-dominated type geothermal system. Alkanes (C<sub>1</sub>-C<sub>4</sub>) and alkene (C<sub>2</sub>) were detected in all samples. Light hydrocarbon contents of CO<sub>2</sub>-type steam are slightly higher than those of C0<sub>2</sub>-H<sub>2</sub>S-type steam. The isotope composition of methane and the relationship between methane/ethane ratio and <em>δ</em><sup>13</sup>C-value of methane suggest that these light hydrocarbon gases are mixtures of thermogenic and abiogenic components. The abiogenic hydrocarbon may be attributed to magmatic hydrocarbon gases equilibrated with carbon dioxide at <em>f</em><sub>O2</sub> defined by the fayalite-magnetite-quartz buffer (FMQ).</p></div>","PeriodicalId":100231,"journal":{"name":"Chemical Geology: Isotope Geoscience section","volume":"94 4","pages":"Pages 321-329"},"PeriodicalIF":0.0000,"publicationDate":"1992-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0168-9622(92)90007-W","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemical Geology: Isotope Geoscience section","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/016896229290007W","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Light hydrocarbon and isotope compositions of methane were analyzed in well steam samples from the Matsukawa vapour-dominated type geothermal system. Alkanes (C1-C4) and alkene (C2) were detected in all samples. Light hydrocarbon contents of CO2-type steam are slightly higher than those of C02-H2S-type steam. The isotope composition of methane and the relationship between methane/ethane ratio and δ13C-value of methane suggest that these light hydrocarbon gases are mixtures of thermogenic and abiogenic components. The abiogenic hydrocarbon may be attributed to magmatic hydrocarbon gases equilibrated with carbon dioxide at fO2 defined by the fayalite-magnetite-quartz buffer (FMQ).
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