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

研究海洋地壳第2层的水文地球化学对于更彻底地了解地壳中发生的蚀变反应以及与海洋和第2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，作为地层水被困在第2层的流体组成对建模和通量计算至关重要。海洋钻探可以直接对这些流体进行取样。不幸的是，钻井过程经常会干扰井内的流体，因此需要制定采样计划，在流体达到平衡后再返回现场。虽然这种回访是由钻探船自己进行的，但正在完善其他技术，以便由潜水船（法国）和常规研究船（美国）进行回访取样。本奖项将继续支持吉斯克斯博士进行此类研究。他最近和法国人一起参加了一个在大西洋的重返计划。该奖项的资金将用于支持这次巡航的分析和结果的发表。此外，他还将负责设计一个新的采样器，该采样器将部署在Scripps研究所正在建造的再入飞行器的钻孔中。该系统将通过地面船只的电缆导航工具部署采样器，从而消除了昂贵的潜水器或钻井船的需求。

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.