Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64
Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64
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DOI：
10.2973/dsdp.proc.64.124.1982
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发表时间：
1982-10
期刊：
影响因子：
--
通讯作者：
E. Galimov;B. Simoneit
中科院分区：
文献类型：
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作者：
E. Galimov;B. Simoneit
我们分析了间隙气体孔在站点474，477，478，479和481在加州湾，使用气相色谱和稳定同位素质谱法，以评估其组成的生物和热源。碳氢化合物气体（C1-C5）浓度与船上数据相当，未检测到烯烃。CH 4的δC数据证实了热应力对沉积有机质的影响，因为这些值通常是在地表附近的生物成因，并且在474、478和481号站点的钻孔中，相对于深度，δ C变得更加贫乏。477孔的甲烷含量最高，而479孔的甲烷含量没有表现出明显的高温成分。大部分钻孔深部的CO2主要是热成因的，来源于碳酸盐岩。罐头沉积物的顶空气体中C2-C5烃的低浓度排除了其成因的稳定碳同位素分析。
We analyzed interstitial gases from holes at Sites 474, 477, 478, 479, and 481 in the Gulf of California, using gas chromatography and stable isotope mass spectrometry to evaluate their composition in terms of biogenic and thermogenic sources. The hydrocarbon gas (C1-C5) concentrations were comparable to the shipboard data, and no olefins could be detected. The δC data for the CH4 confirmed the effects of thermal stress on the sedimentary organic matter, because the values were typically biogenic near the surface and became more depleted in C versus depth in holes at Sites 474, 478, and 481. The CH4 at Site 477 was the heaviest, and in Hole 479 it did not show a dominant hightemperature component. The CO2 at depth in most holes was mostly thermogenic and derived from carbonates. The low concentrations of C2-C5 hydrocarbons in the headspace gas of canned sediments precluded a stable carbon-isotope analysis of their genetic origin.