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

0136238Polyak这是俄亥俄州立大学和奥多明尼恩大学首席研究员的合作提案。 首席研究员将调查美国地质调查局 (USGS) 于 1992 年收集和整理的楚科奇边境沉积物岩心。这些岩心位于包含几代冰川成因床形态的区域，这些河床形态由科学冰运动 (SCICEX) 于 1999 年进行的调查绘制。这些岩心的初步岩石地层学已根据其物理特性日志和岩心描述进行了开发。主要研究人员将根据岩性和古生物学（有孔虫）成分和古地磁测量来验证并进一步开发这种地层学，并通过 14C 测年和颗石岩研究得到加强。这些方法将使他们能够将楚科奇边境岩心置于亚美亚盆地的地层背景中，并将其与罗蒙诺索夫海岭沉积物记录相关联。研究结果应有助于建立改进的北冰洋第四纪年龄模型。对楚科奇边境岩芯回收的冰川成因二聚体的调查将有助于我们了解海底隆起冰架接地的过程。通过使用沉积物中冰川碎屑的成分作为来源示踪剂，他们确定了维持冰架的冰川中心。这些地层限制信息将深入了解北冰洋内部和外围的更新世冰川历史，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.