Thermal Maturity and Fluid-Rock Interactions Within Franciscan and Related Rocks: A Test of the Slab-Window Hypothesis

已经发展了理论模型来预测吸积棱柱的热结构，使用的边界条件主要是从现代实例的海洋调查中确定的。目前尚不清楚是否可以在古老的吸积沉积物中识别出原始热体制的Clement元素。这项研究的目的是确定加利福尼亚晚中生代Franciscan杂岩是否保留了原始的增生式热结构，或者该热结构是否由于门多西诺三重结的通过或其他加热事件而被叠置。镜质组反射率、粘土的X射线衍射、流体包裹体地质测温、稳定同位素和裂变径迹测量的程序将与介观结构组构和矿脉几何形状的详细野外测绘结果相结合。这些数据将为一般吸积络合物的热演化理论模型提供重要的约束。

Theoretical models have been developed to predict thermal structure of accretionary prisms, using boundary conditions largely determined from marine investigations of modern examples. It is unclear if clements of the primary thermal regime can be recognized in ancient accreted sediments. The aim of this research is to determine whether the late Mesozoic Franciscan Complex of California retains a primary accretionary thermal structure or whether the thermal structure has been overprinted due to the passage of the Mendocino triple junction or to other heating events. A program of vitrinite reflectance, X-ray diffraction of clays, fluid inclusion geothermometry, stable isotopes and fission-track measurements will be integrated with the results of detailed field mapping of mesoscopic structural fabrics and vein geometries. These data will provide important constraints on theoretical models for the thermal evolution of accretionary complexes in general.