Geochemistry at DSDP Leg 62 Holes

A total of 191 samples was collected for inorganic geochemical analyses from DSDP Holes 463, 464, 465, 465A, and 466. These samples were collected with two main goals. First, at least one sample was collected from each core, whenever possible, to document the general geochemical variability within lithologic units. Unfortunately, several lithologic units were inadequately sampled because of poor recovery, mostly due to the presence of chert. The least-sampled units are Units III in Hole 464 and Units IB and II in Hole 466. The second goal was to look for geochemical differences between contrasting lithologies within main lithologic units, particularly between cyclic interbeds of red and green limestone in Lithologic Unit II, Hole 463, and between olive, laminated limestone and gray, massive limestone in Lithologic Unit II, Hole 465A.

深海钻探计划（Deep Sea Drilling Project, DSDP）的463、464、465、465A及466钻孔共计采集了191件样品用于无机地球化学分析。本次采样设有两大核心目标：其一，尽可能从每个岩芯中采集至少一件样品，以记录各岩性单元内部的整体地球化学变异性。但受限于不佳的岩芯取芯收获率（多因燧石层存在所致），部分岩性单元的采样量不足，其中采样量最少的单元为464钻孔的第三岩性单元，以及466钻孔的IB和第二岩性单元。其二，探究主要岩性单元内不同岩性之间的地球化学差异，具体涵盖463钻孔第二岩性单元内红色与绿色灰岩周期性互层间的差异，以及465A钻孔第二岩性单元内橄榄色纹层状灰岩与灰色块状灰岩间的差异。