(Table 1) Oxygen isotope temperatures from hydrothermally altered breccias at DSDP Hole 60-453

Gabbro-metabasalt polymict breccias cored in Deep Sea Drilling Project Hole 453 are cemented in part by hydrothermal alteration to lower greenschist facies (chlorite-epidote-actinolite) mineral assemblages. Temperature estimates for this alteration, based on oxygen isotope determinations of secondary minerals, are nearly 100°C at the top of the breccias and over 200°C in a zone of intense alteration near the base.

深海钻探计划（Deep Sea Drilling Project）453号钻孔取心获得的辉长岩-变基性岩多碎屑角砾岩，部分经热液蚀变（hydrothermal alteration）胶结，形成低绿片岩相（lower greenschist facies）的绿泥石-绿帘石-阳起石（chlorite-epidote-actinolite）矿物组合。基于次生矿物（secondary minerals）的氧同位素测定（oxygen isotope determinations）结果得到的该蚀变作用温度估算值显示：角砾岩顶部温度接近100℃，底部附近的强蚀变带内温度则超过200℃。