Compositional and isotopic characteristics of hydrocarbons generated by a hydrothermal experiment simulating seafloor sediment alteration stepwise heating from 275 to 361°C at 30 MPa
作者: Shinsuke KawagucciJeffery S. Seewald
作者单位: 1Super-cutting-edge Grand and Advanced Research (SUGAR) Program, Institute for Extra-cutting-edge Science and Technology Avant-garde Research (X-star), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
2Department Marine Chemistry and Geochemistry (MC&G), Woods Hole Oceanographic Institution (WHOI)
刊名: GEOCHEMICAL JOURNAL, 2019, Vol.53 (4), pp.281-291
来源数据库: J-STAGE Journals
DOI: 10.2343/geochemj.2.0566
关键词: Carbon isotope ratioHydrogen isotope ratioFluid-sediment interactionLow molecular-weight hydrocarbonsOkinawa Trough
原始语种摘要: We conducted a laboratory hydrothermal experiment that simulated generation of low molecular-weight hydrocarbons during seafloor sediment alteration at 275–361°C and 30 MPa. The abundance and carbon and hydrogen stable isotope composition of low molecular weight thermogenic hydrocarbons in the fluids were determined. In general, the abundance of C1−C4 alkanes increased with time. The abundance of CH4 relative to C2−C4 alkanes as reflected by C1/C2+ ratios showed progressive increases from 1.2 to 4.3 with continued sediment heating. Alkenes were enriched in early phase and decreased with time. Carbon isotope ratios (δ13C) of thermogenic CH4 ranged between –42.0~−24.2‰. Carbon isotope ratios of C2H6 and C3H8 were similar to each other throughout the experiment (δ13C = –28.0~−20.3‰). In...
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  • hydrocarbons 碳化氢
  • sediment 沉积
  • alteration 蚀变
  • thermogenic 产生热的
  • experiment 实验
  • heating 加热
  • ratios 遗传比率
  • isotopic 同位素置换
  • isotope 同位素
  • hydrothermal 热液的