Multiple Sampling of DSDP/ODP Bore Hole Waters for Geochemical Studies

研究洋壳第二层的水文地球化学对于更深入地了解地壳中发生的蚀变反应以及与海洋和第二层之间的交换有关的地球化学通量具有重要意义。在这两种情况下，作为地层水的第二层中捕获的流体的组成对于模拟和通量计算都是至关重要的。大洋钻探可以直接对这种流体进行采样。不幸的是，钻井过程经常扰乱井眼中的流体，需要采样计划，即在流体达到平衡后返回现场。尽管这种回访是由钻井船本身完成的，但其他技术正在完善，以允许潜水器(法国)和常规考察船(美国)进行回访采样。目前的奖项将继续支持吉斯克斯博士的这类研究。他最近与法国人一起参加了大西洋上的一个重返大气层计划。该奖项中的资金将支持分析和发布这次巡航的结果。此外，他还将负责设计一种新的采样器，该采样器将部署在斯克里普斯研究所正在建造的重返大气层飞行器的钻孔中。该系统将从车辆上部署采样器，采样器通过电缆从水面船只导航，不需要昂贵的潜水器或钻井船。

Studies of the hydrogeochemistry of layer 2 of the oceanic crust are of primary importance for gaining a more thorough understanding of alteration reactions occurring in the crust and geochemical fluxes associated with exchange between the ocean and layer 2. In both cases the composition of the fluids trapped in layer 2 as formation waters is critical to modelling and flux calculations. Ocean drilling allows such fluids to be directly sampled. Unfortunately, the drilling process often disturbs the fluids in a hole requiring a sampling plan that involves a return to the site after the fluids have come to equilibrium. Although such return visits have been done by the drillship itself, other techniques are being perfected to allow return sampling by submersible (France) and by regular research vessels (United States). The present award will continue support to Dr. Gieskes for such studies. He has recently participated with the French in a re- entry program in the Atlantic. Funds in the this award will support analyses and publication of the results from this cruise. Additionally, he will undertake the design of a new sampler to be deployed in drillholes from a re-entry vehicle under construction at Scripps Institution. This system will deploy the samplers from a vehicle navigated on a cable from a surface vessel, eliminating the need for a costly submersible or drillship.