论文标题
来自镁质海皮的缺氧风化的行星生物圈的营养供应
Nutrient Supply to Planetary Biospheres from Anoxic Weathering of Mafic Oceanic Crust
论文作者
论文摘要
磷是生命的重要元素，磷循环被普遍认为是限制地球生物圈范围及其对地球大气化学遥远特征的影响的关键因素。大陆风化通常被认为是海洋生物圈的生物利用磷的唯一来源，其海底热液过程用作磷下水道。在这里，我们使用一种新颖的29SI示踪技术来证明在缺氧条件下海底玄武岩的改变会导致明显的可溶磷释放，并且磷释放和CO2消耗量（P/CO2）的估计比为3.99 +/-/- 1.03 umol/mmol。该比率与现代河流相媲美，这表明在缺氧条件下进行的海底风化可能是对行星海洋的可生物利用磷的重要来源，并且缺乏暴露的大陆的挥发性丰富的地球行星可以发展能够远程检测可远程检测可远程检测的大气生物量化的能力。
Phosphorus is an essential element for life, and the phosphorous cycle is widely believed to be a key factor limiting the extent of Earth's biosphere and its impact on remotely detectable features of Earth's atmospheric chemistry. Continental weathering is conventionally considered to be the only source of bioavailable phosphorus to the marine biosphere, with submarine hydrothermal processes acting as a phosphorus sink. Here, we use a novel 29Si tracer technique to demonstrate that alteration of submarine basalt under anoxic conditions leads to significant soluble phosphorus release, with an estimated ratio between phosphorus release and CO2 consumption (P/CO2) of 3.99+/-1.03 umol/mmol. This ratio is comparable to that of modern rivers, suggesting that submarine weathering under anoxic conditions is potentially a significant source of bioavailable phosphorus to planetary oceans and that volatile-rich Earth-like planets lacking exposed continents could develop robust biospheres capable of sustaining remotely detectable atmospheric biosignatures.
