Analysis of manganes deposits on Leg XV

The sediments of Leg 15 included several noteworthy occurrences of authigenic, volcanic and continentally derived minerals. Of these, the occurrence of native copper in pelagic clays, the relatively well developed crystals of clinoptilolite in several older volcanic clays, the widespread authigenic K-feldspar, and the occurrences of garnet (one of which appears to be authigenic; the other, not positively identified, may be volcanic) are especially interesting. At Site 150 of Leg 15 several nodules were found in Cores 4 and 5 at subbottom depths of about 100 to 115 meters. It is not certain from the occurrence whether these nodules were a) buried, having grown elsewhere, or b) were found in their present position as a result of drilling disturbance. The depth of the occurrence appears to preclude the last possibility.第15航次（Leg 15）所采集的沉积物中，存在多例值得关注的自生矿物、火山成因矿物与陆源矿物产出。其中，远洋黏土（pelagic clays）中的自然铜产出、多套古老火山黏土中发育较为完好的斜发沸石（clinoptilolite）晶体、广泛分布的自生钾长石（K-feldspar），以及石榴子石（garnet）的产出（其中一颗疑似为自生成因，另一颗尚未明确鉴定，可能属于火山成因）尤为引人关注。在第15航次的150站位，研究人员于4号和5号岩心的海底以下（subbottom）约100至115米深度处发现了数块结核。目前尚无法依据该产出特征确定这些结核属于以下两种情况之一：a）在异地生成后被埋藏至此，或是b）因钻井扰动（drilling disturbance）而停留在当前位置。但该结核的产出深度似乎可以排除后一种可能性。