期刊
JOURNAL OF GEOCHEMICAL EXPLORATION
卷 95, 期 1-3, 页码 88-100出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.gexplo.2007.05.007
关键词
gas hydrate; type of organic matter; CO2; biogenic methane; early diagenesis; Nankai Trough
Sediment core samples from Sites 1175, 1176, and 1178, ODP Leg 190, Nankai Trough were analyzed for sedimentary organic matter and inorganic elemental compositions to clarify geochemical conditions for the formation of gas hydrate. Low chloride concentrations and anomalously low core temperature infer the existence of gas hydrate at Site 1178. Trace amounts of gas hydrate are also suggested for Site 1176. Site 1175 does not have any significant evidence of gas hydrate, although all the three sites are within the gas hydrate stability zone. The sediment from Site 1178 is characterized by abundant terrigenous organic matter, older geologic ages, and comparatively higher maturity levels, suggesting high rates Of CO2 generation during diagenesis. The CO2 generation potential of sediment may be one of the crucial conditions for the formation of gas hydrate. (C) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据