Sr, C and O isotope ratios of Neogene sediments from DSDP Hole 38-341, Voring Plateau@en

The Neogene sediments from DSDP site 341 on the Voring Plateau, Norwegian Sea, contain a thin glauconitic pellet-bearing subunit, which separates underlying pelagic clays from overlying glacial-marine sediments. Oxygen isotope measurements of benthic foraminifera show a delta18O shift of + 1 per mil during deposition of this subunit, probably a combined effect of a drop in bottom water temperature and a rise in seawater delta18O. The chronology of this sedimentological and O isotope transition is, however, poorly constrained by fossil evidence. […]挪威海沃林高原（Voring Plateau）上的深海钻探计划（Deep Sea Drilling Project，DSDP）341站位的新近纪沉积物中，存在一层薄的含海绿石颗粒亚层，该亚层将下伏远洋黏土与上覆冰海沉积物分隔开来。对底栖有孔虫（benthic foraminifera）的氧同位素测定结果显示，在该亚层沉积期间，δ¹⁸O偏移量达+1‰，其成因可能为底层水温下降与海水δ¹⁸O升高的共同作用。然而，该沉积学与氧同位素转变事件的年代学框架受化石证据的约束程度较低。[…]