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

0136238 Polyak这是由俄亥俄州州立大学和旧自治领大学的主要研究人员合作提出的一项建议。 主要调查人员将调查1992年由美国地质调查局（USGS）收集和管理的楚科奇边境地区的沉积物岩心。核心地点位于一个包含几代冰川形成的底形的地区，这些底形是1999年科学冰演习（SCICEX）调查绘制的。 根据岩心的物理性质、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。主要研究人员将根据岩性和古生物（有孔虫）成分和古地磁测量，并通过14C测年和颗石研究来验证和进一步开发这一地层。这些方法将使他们能够把楚科奇边疆区的核心到一个地层背景下的美亚盆地，并将它们与罗蒙诺索夫海岭沉积物记录。研究结果有助于建立一个改进的北冰洋第四纪年龄模型。对楚科奇边界冰芯中发现的成冰双质体的研究将有助于我们了解海底隆起冰架的形成过程。通过使用沉积物中的冰川碎屑成分作为物源示踪剂，他们确定了维持冰架的冰川作用中心。这种地层约束的信息将产生深入了解更新世冰川的历史的内部和周边的北冰洋，并将提高我们的理解大陆冰盖和冰架之间的相互作用。

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.