(Table 1-2, page 630-631) Chemical determinations of iron-manganese rich sediments, Sites 183 and 192A, DSDP Leg 19

Basal sediments cored above alkali basalt at Site 183 beneath the Aleutian Abyssal Plain include iron-rich clays, a geothite-bearing calcareous ironstone (23.8% Fe and 4.16% Mn, CaCO3-free), and a pyrite-bearing unfossiliferous aragonitic limestone with 1.95 per cent Sr. At Hole 192A, atop Meiji Guyot, the northernmost of the Emperor Seamounts, five meters of iron and manganese-enriched clays interlayered and diluted with chalk lie on extrusive alkali basalt pillow lavas beneath almost a kilometer of silts, clays, and diatomaceous oozes.

阿留申深海平原（Aleutian Abyssal Plain）下方183站位的碱性玄武岩（alkali basalt）之上取芯获取的基底沉积物，包含富铁黏土、一种含针铁矿（geothite）的钙质铁矿岩（无碳酸钙基准下全铁含量23.8%、锰含量4.16%），以及一种含黄铁矿（pyrite）的无化石文石质灰岩（aragonitic limestone），其锶含量为1.95%。在天皇海山链（Emperor Seamounts）最北端的明治海山（Meiji Guyot）顶部的192A钻孔中，近千米厚的粉砂、黏土与硅藻软泥（diatomaceous oozes）之下，赋存着喷发型碱性玄武岩枕状熔岩（pillow lavas），熔岩之上覆盖着5米厚的与白垩互层且受白垩稀释的富铁锰黏土。