Hydrothermal Circulation on Sediment-Starved Mid-Ocean Ridges

目的是对低分子量聚乙烯进行综合研究， 温度热液对流发生在年轻的中期， 沉积物覆盖薄且不完整的洋脊侧翼。 现场计划将包括一个应答器导航热 在三个不同年龄的沉积池的流量测量 大西洋中脊的侧翼，以及孔隙压力 确定流速和现场水文的测量 沉积物的性质。 热流测量将 沿沿着和横跨每个池塘的剖面中制作， 在异常附近的测量。 活塞芯 将用于确定物理性质， 将被保存用于未来的孔隙水化学研究。的 数据将根据流体流动模型进行解释。 %%% 大洋地壳中的热液循环具有 对地球的热量收支和化学物质的影响 地壳和海洋之间的交换。 知之甚少 关于不完全的低温热液体系 覆盖在大洋中部两侧的沉积池 山脊 这一领域的计划将是第一次详细看看 这一重要的海洋地壳热状态。

Objective is to make a comprehensive study of low temperature hydrothermal convection occurring in young mid- ocean ridge flanks where sediment cover is thin and incomplete. The field program will involve a transponder navigated heat flow survey in three sediment ponds of different ages on the flanks of the Mid-Atlantic Ridge, as well as pore pressure measurements to determine flow rates and in situ hydrologic properties of the sediment. Heat flow measurements will be made in a profile along and across each pond, with additional measurements in the neighborhood of anomalies. Piston cores will be taken for the determination of physical properties and will be preserved for future work on pore water chemistry. The data will be interpreted in terms of fluid flow models. %%% Hydrothermal circulation in the oceanic crust has a profound impact on the heat budget of the earth and on chemical exchange between the crust and the ocean. Little is known about the low temperature hydrothermal regime of incompletely covered sediment ponds that occur on the flanks of mid-ocean ridges. This field program will be the first detailed look at this important thermal regime in the oceanic crust.