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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.

该研究检查了南部高平原的晚第四纪沉积物，以获取有关过去环境的信息。许多干涸的山谷穿过该地区，并在过去 11,000 多年里慢慢地被沉积物填满。先前的分散地貌调查强烈表明第四纪晚期沉积和成土事件以及类似的区域环境变化具有同步性。该研究的首要目标是记录第四纪晚期地层历史，以检验同步区域地貌和土壤形成事件的假设。另一个目标是了解更新世末期的环境和水文变化。 11,000 至 10,000 年间，沿河和河段之间存在从流动水到静止水的明显的异相水文变化。 B.P. 目前尚不清楚这些变化是由于当地地貌条件还是环境差异造成的。第三个目标旨在了解全新世中期环境。此时似乎出现了区域性的大规模风成沉积，表明存在严重的大面积干旱。拟议的研究将有助于建立广阔地区（超过 120,000 平方公里）的晚第四纪古环境记录，而迄今为止仅在少数地点了解这一记录。这一记录似乎是环境发生巨大变化的记录之一，历史时期显然就是这样。了解过去的这些变化有助于应对未来的极端气候。