(Table 1) Chemical composition of phillipsites from pelagic bottom sediments of the Transpacific profile

Results of petrographic, chemical and X-ray studies of zeolites in sediments in the Transpacific lithological profile from the coast of Japan to the coast of Mexico are reported. For ocean phillipsites constancy of Si/Al ratio (2.44-2.87) and unstable cation composition in quantitative predominance of potassium over sodium are characteristic. Two groups of ocean phillipsites are distinguished: of deep-water basins and of submarine rises. The first spread over broad areas of the pelagic zone, and are formed by diagenetic transformation of fine dispersed pyroclastic material in minimum sedimentation rates, the latter occur locally - in areas of basaltic volcanism manifestations.

本文报道了日本海岸至墨西哥海岸跨太平洋岩性剖面中沉积物内沸石（zeolites）的岩石学、化学及X射线研究结果。海洋钙十字沸石（ocean phillipsites）的典型特征为：硅铝比（Si/Al）稳定在2.44~2.87范围内，阳离子组成不稳定，且整体以钾元素占主导地位。可将海洋钙十字沸石划分为两类：深水盆地型与海隆型。前者广泛分布于远洋带的广阔区域，由细分散火山碎屑物质在极低沉积速率下经成岩作用改造形成；后者则仅局部分布于玄武岩火山活动发育区域。