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Physical chemistry

机译：物理化学

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Fe-Si oxide deposits were recovered from the PACMANUS (Papua New Guinea-Australia-Canada-Manus) hydrothermal field in Eastern Manus basin. Samples were loose and fragile. Optical and scanning electron microscopy showed that the samples had abundant rod-like or twisted filamentous and granular structures. Electron probe microanalysis revealed that these filaments and grains were mainly composed of Fe and Si. The presence of spherical grains on the surface of the filaments suggests the intergrowth of biotic and abiotic reactions. Biotic and abiotic kinetics competition always exists in the redox gradient. Based on the physico-chemical conditions of PACMANUS hydrothermal fluids, we calculated a strict abiotic oxidation rate of Fe~(2+) to Fe~(3+), which is approximately 0.0123 g/min. If the fluids had been erupting consistently and the concentration of Fe~(2+) was constant, 3.232 kg per year of Fe would be deposited in this vent. The amount of Fe oxides around the studied vent was larger than the amount determined by strict abiotic kinetic calculation.Bacteria may also play an important role in Fe oxidation. A mesh-like microenvironment constructed by biogenic filaments ensured adequate Fe~(2+) and low oxygen content for the growth of bacteria. Moreover, this structure promoted the deposition of abiotic Fe-Si oxides.
机译：从东部马努斯盆地的PACMANUS（巴布亚新几内亚-澳大利亚-加拿大-马努斯）热液田中回收了铁硅氧化物矿床。样品松散易碎。光学和扫描电子显微镜显示样品具有丰富的棒状或扭曲的丝状和颗粒状结构。电子探针显微分析表明，这些细丝和晶粒主要由Fe和Si组成。细丝表面上存在球形颗粒表明生物和非生物反应的共生。生物和非生物动力学竞争总是存在于氧化还原梯度中。根据PACMANUS热液的物理化学条件，我们计算出Fe〜（2+）到Fe〜（3+）的严格非生物氧化速率，约为0.0123 g / min。如果流体持续喷发且Fe〜（2+）的浓度恒定，则每年3.232 kg的Fe将沉积在该通风孔中。所研究的排气孔周围的Fe氧化物的量大于通过严格的非生物动力学计算确定的量。细菌也可能在Fe氧化中起重要作用。由生物细丝构成的网状微环境可确保足够的Fe〜（2+）和低氧含量，以促进细菌的生长。而且，这种结构促进了非生物Fe-Si氧化物的沉积。

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    《Oceanographic Literature Review》 |2016年第2期|276-277|共2页
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