High-resolution Stratigraphy: Application to Hydrologic- climatic Reconstruction in Southwestern U.S.

晚更新世-全新世的一个长的、几乎呈纹状的层序 在埃斯坦西亚湖发现了层状和层理 位于新墨西哥州中部的一个盆地。 垂直连续性 叠层和垫层为重建一个 十年、百年、千年地层时间序列 分辨率 最初应用于纹状沉积物的方法将 适于基于累积的时间序列来重建时间序列 垫层和叠层的厚度，并用放射性碳“调整” 日期. 水的体积变化和膨胀和收缩 浅湖的沉积速率反映在粘土的堆积上， 碳酸钙和石膏砂的膨胀流入。 这些 参数将在紧密间隔的样本中测量，索引为 重建的时间序列，并表示为泥沙通量。 高位岸线沉积与盆心的对比 将导致一个先进的水文- 气候模式 该项目将确定重建的可行性 半干旱湖泊高分辨率地层记录 环境，同时评估水文- 潜在重要地点和沉积物的气候敏感性 记录

A long, almost varved sequence of late Pleistocene-Holocene laminations and bedding have been identified in the Estancia lake basin in central New Mexico. Remarkable vertical continutity of laminations and bedding provide a basis for reconstructing a stratigraphic time-series with decadel, centennial and millenial resolution. Methods originally applied to varved sediments will be adapted to reconstruct a time-series based on accumulated thickness of bedding and laminations and "tuned" with radiocarbon dates. Changes in water volume and expansion and contraction of the shallow lake are reflected in the rate of accumulation of clay, calcium carbonate, and eolean influx of gypsum sand. These parameters will be measured in closely spaced samples, indexed to the reconstructed time-series, and expressed as sediment flux. Correlation of high-stand shoreline deposits with basin-center strata will lead to the development of an advanced hydrologic- climatic model. The project will determine the feasibility of reconstructing high-resolution stratigraphic records in semi-arid lacustrine environments and at the same time evaluate the hydrologic- climatic sensitivity of a potentially important site and sediment record.