Diatom biostratigraphy of sediments from the Kerguelen Plateau, Southern Ocean

The biostratigraphic distribution and abundance of lower Oligocene to Pleistocene diatoms is documented from Holes 747A, 747B, 748B, 749B, and 751A drilled during Ocean Drilling Program Leg 120 on the Kerguelen Plateau in the southeast Indian Ocean. The occurrence of middle and upper Eocene diatoms is also documented, but these are rare and occur in discrete intervals. The recovery of several Oligocene to Pleistocene sections with minimal coring gaps, relatively good magnetostratigraphic signatures, and mixed assemblages of both calcareous and siliceous microfossils makes the above four Leg 120 sites important biostratigraphic reference sections for the Southern Ocean and Antarctic continent. A high-resolution diatom zonation divides the last 36 m.y. into 45 zones and subzones. This zonation is built upon an existing biostratigraphic framework developed over the past 20 yr of Southern Ocean/Antarctic deep-sea coring and drilling. […]本数据集记录了东南印度洋凯尔盖朗高原大洋钻探计划（Ocean Drilling Program, ODP）第120航次所钻取的747A、747B、748B、749B及751A孔中，渐新世早期至更新世硅藻（diatoms）的生物地层学（biostratigraphic）分布与丰度特征。中始新世及上始新世硅藻的产出同样被记录，但此类硅藻较为稀少且仅见于离散层位。本次获取的渐新世至更新世地层剖面具备极小的取芯间隙、相对完整的磁地层学（magnetostratigraphic）信号，且包含钙质与硅质微化石的混合组合，使得上述120航次的4个站位成为南大洋与南极大陆重要的生物地层参考剖面。一套高分辨率硅藻分带体系将过去36百万年划分为45个带及亚带。该分带体系基于过去20年间南大洋/南极深海取芯与钻探工作所建立的现有生物地层框架构建而成。[…]