Catabolic and anabolic energy for chemolithoautotrophs in deep-sea hydrothermal systems hosted in different rock types
Catabolic and anabolic energy for chemolithoautotrophs in deep-sea hydrothermal systems hosted in different rock types
复制标题
DOI：
10.1016/j.gca.2011.07.041
复制
发表时间：
2011-10-01
影响因子：
5
通讯作者：
Bach, Wolfgang
中科院分区：
文献类型：
--
作者：
Amend, Jan P.;McCollom, Thomas M.;Bach, Wolfgang
活跃的深海热液喷口由一系列不同的岩石组成，包括玄武岩、橄榄岩和长英质岩石。相关的热液流体表现出显着的化学变化，这在很大程度上是由于下伏寄主岩石之间的成分差异。数值模型被用来评估能量的7个无机氧化还原反应（潜在的分解代谢的化能无机自养生物）和众多的生物分子合成反应（analgesia）在这些系统的代表性采样，其中化学梯度是建立通过混合热液流体与海水。各种各样的流体成分决定了这些分解代谢和合成代谢反应的吉布斯能（Δ G（r））的明显差异，在三个橄榄岩托管，六个玄武岩托管，一个troctolite-玄武岩混合，和两个长英质岩石托管系统。在橄榄岩宿主系统中，在低至中等温度下（10），氢氧化产生最多的分解代谢能量，但甲烷，亚铁和硫化物的氧化也可以是适度的放能。在更高的温度下，以及随之而来的SW：HF混合比
Active deep-sea hydrothermal vents are hosted by a range of different rock types, including basalt, peridotite, and felsic rocks. The associated hydrothermal fluids exhibit substantial chemical variability, which is largely attributable to compositional differences among the underlying host rocks. Numerical models were used to evaluate the energetics of seven inorganic redox reactions (potential catabolisms of chemolithoautotrophs) and numerous biomolecule synthesis reactions (anabolism) in a representative sampling of these systems, where chemical gradients are established by mixing hydrothermal fluid with seawater. The wide ranging fluid compositions dictate demonstrable differences in Gibbs energies (Delta G(r)) of these catabolic and anabolic reactions in three peridotite-hosted, six basalt-hosted, one troctolite-basalt hybrid, and two felsic rock-hosted systems. In peridotite-hosted systems at low to moderate temperatures (10), hydrogen oxidation yields the most catabolic energy, but the oxidation of methane, ferrous iron, and sulfide can also be moderately exergonic. At higher temperatures, and consequent SW: HF mixing ratios