SGER Proposal:Pagodroma Group Stratigraphy and Paleontology: Participation in ANARE 2000-2001

SGER 提案：Pagodroma 群地层学和古生物学：参加 ANARE 2000-2001

• 批准号: 0091676
• 负责人: David Harwood
• 金额: $ 3万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2003-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0091676&HistoricalAwards=false
• 关键词: SGER; Proposal; Pagodroma; Group; Stratigraphy

0091676 HarwoodThis award, provided by the Office of Polar Programs, allows a US investigator to join a geological field team of the Australian National Antarctic Research Expedition (ANARE) in the Prince Charles Mountains of East Antarctica. The purpose of the fieldwork is to investigate past fluctuations of the East Antarctic Ice Sheet that are recorded in glacial strata of the Pagodroma Group in the region. The mountains flank the sides of the Lambert Graben, through which the largest catchment area of the East Antarctic Ice Sheet drains into Prydz Bay. Preliminary fieldwork on the Pagodroma Group has been conducted by the Russian Antarctic Expeditions and the ANARE. Field and laboratory work has identified several marine fossiliferous in situ stratigraphic units and other units that contain glacially reworked marine sediments 300 km inland from the current coastline. These sediments were deposited during ice sheet and ice shelf retreat, during the Miocene and Pliocene-Pleistocene, and were dated through diatom and foraminiferal biostratigraphy and amino acid racemization. Paleoenvironmental conditions during these times of glacial retreat and open marine deposition are determined from in situ marine microfossil data. In contrast, erosional and ice grounding features evident in the strata represent intervals of glacial advance. This award will facilitate collaboration between the principal investigator and Australian colleagues on geological field research during ANARE 2000-2001 and will support subsequent preliminary laboratory analysis on recovered Pagodroma Group materials in order to establish age and paleoenvironmental relationships. Prior field reconnaissance in the area and air photo interpretation of potential new deposits will direct the initial field activities during the coming field season. Chief areas of study are in three regions: the Amery Oasis area, the Lanyon/Meredith area and, if logistical support is available, along the eastern low margin of Fisher Massif. Recent discussions about the Neogene history of Antarctic glaciation center on the age of the Sirius Group and mode of emplacement of marine diatoms in these strata. Preliminary results from coeval strata of the Pagodroma Group support interpretations of significant variation in volume of the East Antarctic Ice Sheet during the Late Neogene. The abundance of diatoms in some intervals of the Pagodroma Group (up to3.5% biogenic silica) and the stratigraphic position of in situ marine diatomaceous laminites prevents contrary discussions about wind-derivation of these marine microfossils. Significant basic documentation of stratigraphy (in the field) and paleontological content (in the laboratory) is required to place the disparate deposits into a temporal and stratigraphic framework and enable correlation within the Prince Charles Mountains and into other areas of Antarctica. If preliminary examination of the recovered materials identifies productive samples for micropaleontological analysis, a follow-up proposal will be prepared to support further study of these materials.

0091676 Harwoodthis奖由极地计划办公室提供，使美国调查员能够加入东南极洲查尔斯山脉的澳大利亚国家南极研究探险队（ANARE）的地质野外团队。现场工作的目的是研究该地区Pagodroma群的冰川层层中记录的东部南极冰盖的过去波动。山脉的侧面是兰伯特·格拉登（Lambert Graben）的侧面，南极冰盖最大的集水区进入了普莱兹湾（Prydz Bay）。俄罗斯南极探险队和阿纳尔（Anare）进行了Pagodroma集团的初步现场工作。现场和实验室工作已经确定了几个海洋化石原位地层单元和其他装有距目前海岸线内陆300公里内冰川的海洋沉积物的单位。这些沉积物在中新世和上新世冰层期间沉积在冰盖和冰架静修期间，并通过硅藻和有孔虫生物地层学和氨基酸种族化的历史。在冰川撤退和开放式海洋沉积期间，古环境条件是由原位海洋微化石数据确定的。相比之下，地层中明显的侵蚀和冰的特征代表了冰川前进的间隔。该奖项将有助于在Anare 2000-2001期间首席研究员与澳大利亚同事在地质领域研究方面的合作，并将支持随后的初步实验室分析，以建立年龄和古环境关系，以建立年龄和古环境关系。该地区的现场侦察和潜在的新存款的空中照片解释将在即将到来的现场季节进行初始现场活动。研究领域是在三个地区：艾米丽绿洲地区，兰蒙/梅雷迪思地区，如果有后勤支持，则沿着费舍尔地块的东部低水平。关于Sirius群体年龄的南极冰川新近冰期新近纪史以及在这些层中海洋硅藻的增态模式的最新讨论。 Pagodroma群体的同时层层的初步结果支持解释新近纪晚期南极冰盖体积的显着变化。珠原子组（高达3.5％的生物二氧化硅）和原位海洋硅藻土层层的地层位置的一定间隔的硅藻的丰度和相反的讨论这些海洋微化石的风源。需要将地层学和古生物学含量（在实验室中）进行大量基本文献，以将不同的沉积物放置在时间和地层框架中，并在查尔斯王子山脉和南极的其他地区内实现相关性。如果对回收材料的初步检查确定了生产性样品进行微生产学分析，则将准备一项后续建议，以支持对这些材料的进一步研究。