Correlation and Chronology of Marine Transgressions in Western Alaska (Collaborative Research)

阿拉斯加西部海洋海侵的相关性和年代学（合作研究）

• 批准号: 8714671
• 负责人: Julie Brigham-Grette
• 金额: $ 9.61万
• 依托单位: University of Massachusetts Amherst
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-07-01 至 1989-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8714671&HistoricalAwards=false
• 关键词: Correlation; Chronology; Marine; Transgressions; Western

Late Cenozoic marine deposits blanketing terraces and coastal plains in western and northern Alaska provide an exceptionally detailed record of high sea level events, the most complete known in any part of the Arctic. Interbedded with glacial drift sequences, these deposits contain an invaluable almanac of Arctic paleoclimates, and establish the time of origin and much of the subsequent history of the Arctic Ocean ice cover. Fossils in the late Cenozoic marine deposits also record both marine and continental dispersal events and thus supplement and interoceanic correlations. This investigation will apply amino-acid geochronology, thermoluminescence, and paleomagnetic studies to marine transgressive deposits exposed on St. Lawrence Island, Seward Peninsula, and around Kotzebue Sound in order to evaluate and correct previously published age correlations. The study will thus result in a much firmer knowledge of the extent and timing of sea-level changes in western and northern Alaska and will provide an extremely useful series of time planes for the development of synoptic knowledge of Arctic paleoclimates and paleo-oceanographic regimes.

覆盖阿拉斯加西部和北部阶地和沿海平原的新生代晚期海洋沉积物提供了异常详细的高海平面事件记录，这是北极任何地区已知的最完整的记录。 这些沉积物与冰川漂移序列互层，包含了宝贵的北极古气候年鉴，并确定了北冰洋冰盖的起源时间和随后的大部分历史。 新生代晚期海洋沉积物中的化石也记录了海洋和大陆扩散事件，从而补充了大洋间的相关性。 这项调查将把氨基酸地质年代学、热释光和古地磁研究应用于圣劳伦斯岛、苏厄德半岛和科策布海峡周围暴露的海侵沉积物，以评估和纠正先前发表的年龄相关性。 因此，这项研究将对阿拉斯加西部和北部海平面变化的范围和时间有更坚实的了解，并将为北极古气候和古海洋状况的天气知识的发展提供一系列极其有用的时间平面。