(Table 1) Mineralogy of DSDP Leg 65 sediments

During Leg 65, four sites were drilled near the mouth of the Gulf of California where high sedimentation rates made it possible to sample young oceanic crust near the ridge crest. The oldest sediments cored were upper Pliocene siltstones (Site 483); the samples at the other sites (482, 484, and 485) were all Quaternary in age. A series of 80 sediment samples, most of them hemipelagic clays, were examined by semiquantitative X-ray diffraction and Carbonate Bomb techniques to determine their mineralogy and carbonate contents. The results of this study may be used to determine their provenance and diagenesis.在第65航次期间，科研人员于加利福尼亚湾口附近钻取了4个钻孔站位。该区域沉积速率极高，得以在洋脊轴部附近获取年轻洋壳样品。其中，483站位钻取的最古老沉积物为上新统上部粉砂岩；其余3个站位（482、484、485）的样品均形成于第四纪。研究团队采用半定量X射线衍射（X-ray diffraction）与碳酸盐弹法（Carbonate Bomb）技术，对共计80件沉积物样品展开分析，其中多数为半远洋黏土，以测定其矿物组成与碳酸盐含量。本研究所得结果可用于追溯样品的物源及其成岩作用过程。