Calcium carbonate, isotopes and Rock-Eval pyrolysis at DSDP Holes 77-535 and 77-540@en

At DSDP Sites 534 (Central Atlantic) and 535 and 540 (Gulf of Mexico), and in the Vocontian Basin (France), Lower Cretaceous deposits show a very pronounced alternation of limestone and marl. This rhythm characterizes the pelagic background sedimentation and is independent of detritic intercalations related to contour and turbidity currents. […]

在深海钻探计划（Deep Sea Drilling Project, DSDP）的534号站位（大西洋中部）、535号与540号站位（墨西哥湾），以及法国沃孔特盆地中，下白垩统沉积物呈现出极为显著的石灰岩与泥灰岩互层特征。该沉积节律是远洋背景沉积作用的典型表征，且与等深流、浊流相关的碎屑夹层无关联。[…]