Late Quaternary Valley Fills and Paleoenvironments of the Southern High Plains

南部高原的晚第四纪河谷充填物和古环境

基本信息

批准号：
8803761
负责人：
Vance Holliday
金额：
$ 17.7万
依托单位：
University of Wisconsin-Madison
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1988
资助国家：
美国
起止时间：
1988-08-01 至 1991-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8803761&HistoricalAwards=false
关键词：
Late Quaternary Valley Fills Paleoenvironments

项目摘要

The research examines late-Quaternary sediments on the Southern High Plains for information on past environments. A number of dry valleys (draws) cross the region and have slowly filled with sediments for the past +11,000 years. Previous scattered geomorphic investigations strongly suggest synchroneity in late Quaternary depositional and soil-forming events and similar regional environmental changes. The first objective of the research is to document the late Quaternary stratigraphic histories of the draws to test the hypothesis of synchronous, regional geomorphic and soil-forming events. Another objective is to understand environmental and hydrologic changes at the end of the Pleistocene. There are marked out-of-phase hydrologic changes from flowing to standing water along and among the draws between 11,000 and 10,000 yrs. B.P. It is unclear whether these variations are due to local geomorphic conditions or environmental differences. The third objective is aimed at understanding middle Holocene environments. There appears to have been regional, massive eolian deposition at this time, suggestive of severe widespread aridity. The proposed research will help establish the late Quaternary paleoenvironmental record for a vast region (over 120,000 km), hitherto known only from a few sites. The record appears to be one of dramatic environmental changes, which is clearly the case for historic times. Understanding these past changes could help in dealing with future climatic extremes.

该研究检查了南部高平原上的期末沉积物，以了解过去的环境。许多干山谷（绘制）越过该地区，并且在过去的+11,000年中慢慢充满了沉积物。先前的散射地貌研究强烈表明在晚期沉积和土壤形成事件以及类似的区域环境变化中的同步性。该研究的第一个目的是记录抽奖的晚期地层历史，以检验同步，区域地貌和土壤形成事件的假设。另一个目的是了解更新世结束时的环境和水文变化。从沿着河流流到积水以及11,000至10,000年之间的水文变化有明显的水文变化。 B.P. 目前尚不清楚这些变化是由于局部地貌条件或环境差异所致。第三个目标旨在理解中年环境。目前似乎有区域性的Eolian沉积，暗示着严重的广泛干旱。拟议的研究将有助于建立广阔地区（超过120,000公里）的第四纪古环境记录，迄今仅从几个地点知道。该记录似乎是巨大的环境变化之一，这显然是历史时代的情况。了解这些过去的变化可能有助于应对未来的气候极端。