Hydrologic Controls on the Initial State of the Incoming Plate: Costa Rica

摘要：BROWN/0203830加利福尼亚大学/SCRIPPSAward的一个项目是在哥斯达黎加下沉板块沿水文边界的横断面进行一系列通量计测量。这个区域的特征是异常低的热流，除了地形高的区域表现出异常高的热流值。通量计的测量将检验低热流区域流体向下流动的假设，而高热流区域流体向上流动的假设。该项目的第二部分将是返回先前研究中部署了35个通量计的吸积棱镜上的区域，以收集活塞芯和热流测量数据。对这些岩心的分析将产生共同定位的温度、化学梯度和直接流体通量数据集，这些数据集将为进入的板块和哥斯达黎加前弧提供更完整的水文图像。

ABSTRACT:BROWN/0203830UNIVERSITY OF CALIFORNIA/SCRIPPSAward is for a project to conduct a series of flux meter measurements along transects across hydrological boundaries in the down going plate off Costa Rica. This region is characterized by anomalously low heat flow, except over regions of topographic highs that exhibit anomalously high heat flow values. The flux meter measurements will test the hypothesis that the regions of low heat flow are characterized by downward fluid flow, while the high-heat-flow areas are characterized by upward fluid flow. A second portion of the project will be to return the areas on the accretionary prism where 35 flux meters were deployed as part of a previous study, to collect piston cores and heat flow measurements. Analyses of these cores will result in co-located temperature, chemical gradient, and direct fluid flux data sets that will provide a more complete hydrological picture of the incoming plate and the Costa Rica forearc.