Collaborative Research: (GRGC) High Resolution Glacial Geologic and Palynologic Records of the Last Deglaciation in the Tropical Andes

合作研究：（GRGC）热带安第斯山脉末次冰消期的高分辨率冰川地质和孢粉学记录

• 批准号: 9422423
• 负责人: Kenneth Young
• 金额: $ 5.27万
• 依托单位: University of Maryland Baltimore County
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-06-01 至 1998-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9422423&HistoricalAwards=false
• 关键词: Collaborative; Research; GRGC; Resolution; Glacial

9422423 Young The primary objective of the proposed project is to obtain continuous, high-resolution, AMS 14C datable proxy records of glaciation and vegetation change from lacustrine sediment cores that span the last deglaciation and Holocene from four regions in the tropical Andes where evidence for abrupt climatic reversals during the last glacial-to-interglacial transition have already been documented. The PIs seek to improve not only the chronology of late-glacial climatic oscillations in the tropical Andes but also to improve the basis for interpreting the sedimentologic and palynologic records. Specifically, the PIs propose: i) to couple glacial geology and glacial-lacustrine sedimentology to provide estimates for the timing , rate, and magnitude of changes in glacier equilibrium -line altitudes during the last deglaciation, ii) to couple modern vegetation studies with palynological analyses of sediment cores from the western Amazon Basin to estimate the timing of and paleoclimatic factors responsible for the abrupt changes in vegetation that marked the last glacial-to-interglacial transition in this region, iii) to collaborate with Ecuadorian geologists to date and characterize geochemically conspicuous tephra units that were deposited during the last deglaciation so that these important isochrons may be used to correlate precisely among proxy records of paleoclimate preserved in sediment and ice cores from different sites in the tropical Andes, and iv) to provide closer age constraints for specific moraines, which, based on both preliminary and published radiocarbon ages, were deposited at about the same time as the YD and H1 Events.

9422423年轻的项目的主要目标是获得连续的高分辨率，AMS 14C的冰川和植被从湖泊沉积物核心发生变化的数据，这些记录跨越了谷物沉积物核心，这些岩石岩心是从热带安第斯山脉中的四个区域进行的最后一次退化和整体的循环，在最后的证据证明了在最后一次熟悉的葡萄ic循环过渡过程中突然发生气候反向的证据。 PI不仅寻求改善热带安第斯山脉晚期气候振荡的年代学，而且还提高了解释沉积学和寄生虫记录的基础。 具体而言，PIS提出：i）与冰川平衡的时间，冰川平衡的变化的时间，速率和幅度的估计相结合，在上一次脱水过程中估算冰川平衡的高度，ii），ii），ii）将现代植被研究与西部亚马逊的质量分析和估计的质量变化，并在亚马逊的质量上进行了变化。 iii）与厄瓜多尔地质学家合作，以标志着迄今为止与厄瓜多尔地质学家合作并表征在最后一次退化期间存放的地球化学tephra单位，以便这些重要的等质素可以与塞氏式冰淇淋相关联，以与冰的距离相关，并在上一次退化中保存这些重要等质的材料，并与冰的相关性不同为特定的moraines提供更紧密的年龄约束，基于初步和发布的放射性碳年龄，它们与YD和H1事件大约同时存放。