Mineral, chemical and isotopic compositions of altered rocks at ODP Sites 193-1188 and 193-1189

During ODP Leg 193, 4 sites were drilled in the active PACMANUS hydrothermal field on the crest of the felsic Pual Ridge to examine the vertical and lateral variations in mineralization and alteration patterns. We present new data on clay mineral assemblages, clay and whole rock chemistry and clay mineral strontium and oxygen isotopic compositions of altered rocks from a site of diffuse low-temperature venting (Snowcap, Site 1188) and a site of high-temperature venting (Roman Ruins, Site 1189) in order to investigate the water-rock reactions and associated elemental exchanges. […]

在大洋钻探计划（Ocean Drilling Program，ODP）第193航次期间，研究团队于长英质保尔海岭峰顶的活跃PACMANUS热液场（PACMANUS hydrothermal field）施工了4个钻探站位，以剖析成矿作用与蚀变模式的垂向及侧向变化规律。本研究提供了采自两处喷口区域蚀变岩的全新实测数据：一处为弥散型低温喷流（diffuse low-temperature venting）区（雪顶，1188站位），另一处为高温喷流（high-temperature venting）区（罗马遗迹，1189站位），数据涵盖黏土矿物组合（clay mineral assemblages）、黏土与全岩地球化学（whole rock chemistry）特征，以及黏土矿物的锶与氧同位素组成（strontium and oxygen isotopic compositions），旨在深入探究水-岩反应（water-rock reactions）及其伴生的元素交换（elemental exchanges）过程。[…]