Sterane and hopane biomarkers capture microbial transformations of complex hydrocarbons in young hydrothermal Guaymas Basin sediments

Sterane and hopane biomarkers capture microbial transformations of complex hydrocarbons in young hydrothermal Guaymas Basin sediments
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甾烷和藿烷生物标记物捕获瓜伊马斯盆地年轻热液沉积物中复杂碳氢化合物的微生物转化

DOI:
10.1038/s43247-022-00582-8
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发表时间:
2022
影响因子:
7.9
通讯作者:
Edgcomb, Virginia P.
Edgcomb, Virginia P.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Mara, Paraskevi;Nelson, Robert K.;Reddy, Christopher M.;Teske, Andreas;Edgcomb, Virginia P.

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在瓜伊马斯盆地,富含有机物的热液沉积物产生复杂的碳氢化合物混合物,包括饱和、芳香和烷基化芳香化合物。我们检查了来自圭亚斯遗址的推芯沉积物,具有不同的温度和地球化学特征,以便更好地了解非生物和生物碳氢化合物的蚀变。在这里,我们提供了藿类生物降解的证据,产生饱和碳氢化合物,如杜马烷和高杜马烷作为中间产物。这些倍半萜副产物存在于较冷的沉积物中,但它们的相对丰度在较热的热液沉积物中急剧减少,这可能是由于热液流动所致。在甾烷池中,我们发现较热的沉积物中甾族化合物有芳构化的趋势。不同地点藿烷和甾烷生物标志物组成的变化反映了与温度相关的地球化学和微生物碳氢化合物变化的差异。与传统上观察到的地下油藏中可能延伸数百米的微生物生物降解模式相比,瓜伊马斯盆地的地表沉积物显示出高度压缩的变化。
In Guaymas Basin, organic-rich hydrothermal sediments produce complex hydrocarbon mixtures including saturated, aromatic and alkylated aromatic compounds. We examined sediments from push cores from Guyamas sites with distinct temperature and geochemistry profiles to gain a better understanding on abiotic and biological hydrocarbon alteration. Here we provide evidence for biodegradation of hopanoids, producing saturated hydrocarbons like drimane and homodrimane as intermediate products. These sesquiterpene by-products are present throughout cooler sediments, but their relative abundance is drastically reduced within hotter hydrothermal sediments, likely due to hydrothermal mobilization. Within the sterane pool we detect a trend toward aromatization of steroidal compounds within hotter sediments. The changes in hopane and sterane biomarker composition at different sites reflect temperature-related differences in geochemical and microbial hydrocarbon alterations. In contrast to traditionally observed microbial biodegradation patterns that may extend over hundreds of meters in subsurface oil reservoirs, Guaymas Basin shows highly compressed changes in surficial sediments.
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