Paleolimnology/Climatology of New York State Finger Lakes: Phase II - Deep Lake Drilling

纽约州中部的五指湖长期以来一直是 被认为是世界上最伟大的见证之一 冰川作用 在这个研究项目的第一阶段，我们能够 首次记录了基岩侵蚀的程度 以及沉积物填充的性质， 地震反射剖面 我们发现这个湖 山谷被侵蚀到海平面以下304米， 包含一个异常厚（高达275米）， Laurentide冰盖冰消作用的沉积记录（14 Ka） 和后冰川时代的历史 这项建议的目的是 请求继续支持深湖钻探 在 除了校准我们的地震地层框架外， 主要科学目标包括：（1）建立一个 14 Ka以来高分辨率古气候记录; 为Laurentide的各种模型提供现场“地面实况” 冰盖消融;（3）测试各种假设， 手指湖的起源和演变 我们的方法来 沉积物分析将是全面的， 涉及岩石地层学的多学科， 年代地层学、生物地层学、物理性质和 化学地层学 在全球范围内， 最近才实现了从大湖中取出长岩心 拟议中的手指湖岩心将增加一个不断增长的 全球湖相序列数据库。

The Finger Lakes of Central New York State have long been considered one of the world's great testimonies to continental glaciation. During Phase I of this research project we were able to, for the first time, document the extent of bedrock erosion beneath the lakes as well as the nature of the sediment fill via seismic reflection profiling. We discovered that the lake valleys have been eroded to as much as 304 m below sea level and contain an unusually thick (up to 275 m) and apparently complete sediment record ( 14 Ka) of Laurentide ice sheet deglaciation and post-glacial history. The purpose of this proposal is to request continuing support for a deep-lake drillcore. In addition to calibrating our seismic stratigraphic framework, the primary scientific objectives include: (1) establishment of a high-resolution paleoclimatic record for the past 14 Ka; (2) provide in situ "ground truth" for various models of Laurentide ice sheet deglaciation; and, (3) test various hypotheses for the origin and evolution of the Finger Lakes. Our approach to sediment analysis will be both comprehensive and multidisciplinary involving lithostratigraphy, chronostratigraphy, biostratigraphy, physical properties and chemostratigraphy. On a global basis, the scientific value of long drillcores form large lakes has just recently been realized and the proposed Finger Lake drillcore will add to a growing global database on lacustrine sequences.