Fluid flow and authigenic carbonates from southern Hydrate Ridge: Analysis of ODP Leg 204 samples

在卡斯卡迪亚大陆边缘的第二增生脊上，天然气水合物影响着许多过程，包括地球化学、生物、海洋学、地质和构造过程。这个山脊被称为水合物山脊，其特点是高度动态的天然气水合物的形成和分解。由于天然气水合物在地质时间尺度上不稳定，伴生碳酸盐可以作为以前天然气水合物赋存状态的替代。特别是在水合物山脊上，已经描述了天然气水合物碳酸盐或方晶石。为了追踪天然气水合物的形成及其在这段时间内的成岩变化，我们计划对将在ODP204航次期间钻探的自生碳酸盐进行地球化学、同位素和沉积学研究。

On the second accretionary ridge of the Cascadia continental margin gas hydrates influence many processes including geochemical, biological, oceanographic, geological and tectonic processes. The ridge, known as Hydrate Ridge is characterized by highly dynamic gas hydrate formation and dissociation. Since gas hydrates are not stable over geological time scales, associated carbonates may be used as a proxy for former gas hydrate occurrences. Particularly on Hydrate Ridge, gas hydrate carbonates or clathrites have been described. In order to trace the formation of gas hydrates and their diagenetic changes during time we are planning to conduct geochemical, isotopic and sedimentological investigations on authigenic carbonates which will be drilled during ODP Leg 204.