Collaborative Research: Establishing the Stratigraphy of Glacigenic Bedforms on the Chukchi Borderland, Arctic Ocean, to Reconstruct the History of Pleistocene Arctic Ice Shelves.

这是俄亥俄州立大学和老道明大学的主要研究人员合作提出的一项建议。主要研究人员将调查楚科奇边境地区的沉积物岩心，这些岩心是1992年由美国地质调查局（USGS）收集和整理的。核心地点位于一个包含几代冰川形成地层的地区，这些地层是1999年科学冰运动（sciex）调查绘制的。根据岩心的物性、测井曲线和岩心描述，对这些岩心进行了初步的岩石地层学研究。首席研究人员将根据岩性和古生物学（有孔虫）组成和古地磁测量来验证和进一步发展这种地层学，并通过14C测年和球粒岩研究来加强。这些方法将使他们能够将楚科奇边地岩心置于美亚拉盆地的地层背景中，并将它们与罗蒙诺索夫岭的沉积物记录联系起来。这些结果将有助于建立一个改进的北冰洋第四纪时代模型。对楚科奇边境地区的冰芯采集到的冰川形成碎屑进行调查，将有助于我们了解海底隆起的冰架搁浅的过程。通过使用沉积物中的冰川碎屑组成作为物源示踪剂，他们确定了维持冰架的冰川中心。这些地层学上受限的信息将使我们对北冰洋内部和外围更新世冰川历史有更深入的了解，并将提高我们对大陆冰盖和冰架之间相互作用的理解。

0136238PolyakThis is a collaborative proposal by Principal Investigators at the Ohio State University and Old Dominion University. The Principal Investigators will investigate sediment cores from the Chukchi Borderland that were collected and curated by the U.S. Geological Survey (USGS) in 1992. The core sites are located in an area that contains several generations of glacigenic bedforms, which were mapped by the Science Ice Exercise (SCICEX) survey in 1999. A preliminary lithostratigraphy for these cores has been developed from their physical properties logs and core descriptions. The Principal Investigators will verify and further develop this stratigraphy based on lithological and paleontological (foraminiferal) compositions and paleomagnetic measurements, reinforced by 14C dating and coccolith studies. These approaches will allow them to put the Chukchi Borderland cores into a stratigraphic context for the Amerasian Basin and to correlate them with the Lomonosov Ridge sediment records. The results should help to establish an improved Quaternary age model for the Arctic Ocean. Investigation of glacigenic diamictons recovered by cores on the Chukchi Borderland will aid our understanding of the processes involved in the grounding of ice shelves on submarine rises. By using the composition of glacigenic clasts in sediments as provenance tracers they identify glaciation centers that sustained the ice shelves. This stratigraphically constrained information will yield insights into the Pleistocene glaciation history of both the interior and the periphery of the Arctic Ocean and will improve ourunderstanding of interactions between continental-based ice sheets and ice shelves.