Millimeter-scale concentration gradients of hydrocarbons in Archean shales: Live-oil escape or fingerprint of contamination?
Millimeter-scale concentration gradients of hydrocarbons in Archean shales: Live-oil escape or fingerprint of contamination?
复制标题
DOI：
10.1016/j.gca.2011.03.014
复制
发表时间：
2011-06-01
影响因子：
5
通讯作者：
Brocks, Jochen J.
中科院分区：
文献类型：
--
作者：
Brocks, Jochen J.
来自西澳大利亚皮尔巴拉的太古代页岩含有生物标志物，这些生物标志物被解释为27亿年前蓝藻和真核生物存在的证据，对地球早期生物圈的进化具有深远的影响。为了重新评估生物标志物的来源，本研究确定了原始岩心材料中碳氢化合物的空间分布。岩石样品被切割成毫米厚的薄片，并分析每块薄片的分子含量。在Hamersley组岩心（类似于2.5 Ga）中，C-
Archean shales from the Pilbara in Western Australia contain biomarkers that have been interpreted as evidence for the existence of cyanobacteria and eukaryotes 2.7 billion years (Ga) ago, with far reaching implications for the evolution of Earth's early biosphere. To re-evaluate the provenance of the biomarkers, this study determined the spatial distribution of hydrocarbons in the original drill core material. Rock samples were cut into millimeter-thick slices, and the molecular content of each slice was analyzed. In core from the Hamersley Group (similar to 2.5 Ga), C-