MARUM - Center for Marine and Environmental Sciences and Department of Geosciences, University of Bremen, 28334 Bremen, Germany.
IFREMER, Marine Geosciences Research Unit, Centre Bretagne, 29280 Plouzané, France.
Sci Rep. 2016 Nov 23;6:37439. doi: 10.1038/srep37439.
Authigenic carbonate build-ups develop at seafloor methane-seeps, where microbially mediated sulphate-dependent anaerobic oxidation of methane facilitates carbonate precipitation. Despite being valuable recorders of past methane seepage events, their role as archives of atmospheric processes has not been examined. Here we show that cyclic sedimentation pulses related to the Indian monsoon in concert with authigenic precipitation of methane-derived aragonite gave rise to a well-laminated carbonate build-up within the oxygen minimum zone off Pakistan (northern Arabian Sea). U-Th dating indicates that the build-up grew during past ~1,130 years, creating an exceptional high-resolution archive of the Indian monsoon system. Monsoon-controlled formation of seep-carbonates extends the known environmental processes recorded by seep-carbonates, revealing a new relationship between atmospheric and seafloor processes.
自生碳酸盐的形成与海底甲烷渗漏有关，在那里微生物介导的硫酸盐依赖型甲烷厌氧氧化促进了碳酸盐的沉淀。尽管它们是过去甲烷渗漏事件的有价值的记录者，但它们作为大气过程档案的作用尚未得到检验。在这里，我们表明，与印度季风相关的周期性沉积脉冲与甲烷衍生的文石的自生沉淀协同作用，导致巴基斯坦近海（北阿拉伯海）缺氧带内形成了一个很好分层的碳酸盐堆积体。U-Th 定年表明，该堆积体在过去的约 1130 年中生长，为印度季风系统创造了一个异常高分辨率的档案。受季风控制的渗漏碳酸盐的形成扩展了已知的由渗漏碳酸盐记录的环境过程，揭示了大气和海底过程之间的新关系。
