Molecular-isotopic studies of carbon turnover and microbial processes in an active subduction zone (Nan TroSEIZE)

我们在此申请延长一年，以成功完成C-Nankai项目;该项目目前正在资助最近参加IODP Exp的Verena Heuer博士的研究。322（2009年9月1日至10月10日），并返回样品进行进一步的巡航后研究。我们迄今为止获得的结果表明，微生物过程的重要性，在megasplay故障和南海海槽的俯冲输入的碳循环，以及深源流体刺激微生物活动的影响。在该项目的最后阶段，我们的目标是表征影响巨型断层（站点C 0004）和传入沉积物（站点C 0011和C 0012）中沉积物的溶解有机碳库，分析选定层位（实验）中的微生物脂质。322），进行实验室孵育，以限制微生物碳循环（实验。#32422;，并公布我们的成果。具体来说，我们寻求进一步限制通过大型断层输送的溶解有机物在刺激微生物活动中的作用。我们试图区分深埋的有机丰富的层，从横向输送的流体在站点C 0012的碳循环的影响。C-Nankai的扩展和完成是充分利用最近获得的样本集的潜力所必需的，并将使我们朝着限制活跃板块边界系统的地质和生物过程之间的相互作用迈出重要的一步。

We hereby apply for a 1-year extension to successfully conclude project C-Nankai; this project is currently funding the research by Dr. Verena Heuer who recently participated in IODP Exp. 322 (September 1 – October 10, 2009) and returned samples for further post-cruise research. Our results obtained to date demonstrate both the importance of microbial processes for the carbon cycling in the megasplay fault and the subduction input of the Nankai Trough as well as the influence of deep-sourced fluids for stimulating microbial activity. In the final stage of the project, we aim to characterize the dissolved organic carbon pool influencing sediments in the megasplay fault (Site C0004) and in incoming sediments (Sites C0011 and C0012), analyze microbial lipids in selected horizons (Exp. 322), conduct laboratory incubations to constrain the microbial carbon cycling (Exp. 322), and publish our results. Specifically we seek to further constrain the role of dissolved organic matter transported through the megasplay fault for stimulating microbial activity. We seek to differentiate the influence of a deeply buried organic-rich layer from that of laterally transported fluids on the carbon cycling at Site C0012. The extension and completion of C-Nankai is required for fully exploiting the potential of the recently obtained samples set and would bring us a significant step closer towards constraining the interplay between geological and biological processes at an active plate-boundary system.