Ocean Drilling Program: Prydz Bay - Clasts of the Cenozoic Glacial Deposits, Glacial Ice Derivation and Hidden East Antarctic Geology

This data were collected as part of the Ocean Drilling Program. All data were collected on Leg 119. The cruise for Leg 119 began at Port Louis Harbor, Mauritius, and finished at the Port of Fremantle, Australia. The objective was to complete a transect, along with Leg 120, to study the Late Cretaceous to Holocene palaeoclimatic history of East Antarctic, tectonic history of the Kerguelen Plateau, and the late Mesozoic rifting history of the Indian plate from East Antarctica.Samples are sediments. Good calibration standards for sediments not available.More information can be obtained from the Ocean Drilling Program website.The data obtained from the drilling is available on the Ocean Drilling Program website (see Download Paleontology Data).From the abstract of one of the papers:During Leg 119 of the Ocean Drilling Program, between December 1987 and February 1988, six holes were drilled in the Kerguelen Plateau, southern Indian Ocean, and five in Prydz Bay at the mouth of the Amery Ice Shelf, on the East Antarctic continental shelf. The Prydz Bay holes, reported here, form a transect from the inner shelf to the continental slope, recording a prograding sequence of possible Late Palaeozoic to Eocene to Quaternary glacially dominated sediments. This extends the known onset of large-scale glaciation of Antarctica back to about 36-40 million years ago, the sedimentary record suggesting that a fully developed East Antarctic Ice Sheet reached the coast at Prydz Bay at this time, and was more extensive than the present sheet. Subsequent glacial history is complex, with the bulk of sedimentation in the outer shelf taking place close to the grounding line of an extended Amery Ice Shelf. However, breaks in the record and intervals of no recovery may hide evidence of periods of glacial retreat.

本数据集采集自大洋钻探计划（Ocean Drilling Program），全部数据均来自第119航次。该航次的航程始于毛里求斯路易港港区，最终停靠澳大利亚弗里曼特尔港。本航次与第120航次共同完成一条断面调查，旨在研究东南极晚白垩世至全新世的古气候演化历史、凯尔盖朗高原（Kerguelen Plateau）的构造演化历史，以及印度板块自东南极分离的晚中生代裂谷作用历史。本次采集的样品为沉积物，目前尚无适配该类沉积物的优质校准标准。更多相关信息可通过大洋钻探计划官网获取。本次钻探获得的数据已上传至大洋钻探计划官网（详见「古生物学数据下载」板块）。据相关论文摘要记载：在1987年12月至1988年2月执行的大洋钻探计划第119航次中，科研团队在南印度洋的凯尔盖朗高原（Kerguelen Plateau）钻取6个钻孔，并在东南极大陆架阿默里冰架（Amery Ice Shelf）入口处的普里兹湾（Prydz Bay）钻取5个钻孔。本文所报道的普里兹湾（Prydz Bay）钻孔形成了一条从内陆架延伸至大陆坡的断面，记录了晚古生代至始新世再到第四纪的、以冰川作用为主导的进积沉积序列。该研究将南极大规模冰川作用的已知起始时间追溯至约3600万至4000万年前，沉积记录显示，彼时发育完全的东南极冰盖（East Antarctic Ice Sheet）已抵达普里兹湾沿岸，且规模远超现代冰盖。后续的冰川演化历史较为复杂，外陆架的大部分沉积作用均发生在扩张后的阿默里冰架的接地带附近。不过，沉积记录中的间断段与无取芯段可能掩盖了冰川退缩时期的相关证据。