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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.

这项研究考察了晚第四纪沉积物上的南部高平原，了解过去的环境信息。一许多干旱的山谷（平局）穿过该地区，并慢慢地在过去的11,000年里充满了沉积物。先前分散的地貌调查强烈表明在晚第四纪沉积和成土事件中，类似的区域环境变化。的第一个目标该研究旨在记录晚第四纪地层抽签的历史来检验同步的假设，区域地貌和土壤形成事件。另一个目的是了解年底的环境和水文变化，更新世有明显的异相水文变化从流动到静止的水沿着和之间的提请 11，000年和10，000年B. P.目前还不清楚这些是否变化是由于当地的地貌条件或环境差异第三个目标是了解中间全新世环境似乎有区域性的，大量的风成沉积物在这个时候，暗示着严重的大面积干旱拟议的研究将有助于建立晚第四纪大面积古环境记录 120，000公里），迄今为止只知道从几个地点。记录似乎是一个巨大的环境变化，这在历史上是显而易见的。了解这些过去这些变化可能有助于应对未来的极端气候。