Assessing Weathering as a Function of Climate in Proximal Alluvial Sediments

评估近端冲积沉积物中气候的风化作用

基本信息

批准号：
1225162
负责人：
Gerilyn Soreghan
金额：
$ 22.9万
依托单位：
University of Oklahoma Norman Campus
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2012
资助国家：
美国
起止时间：
2012-09-15 至 2016-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1225162&HistoricalAwards=false
关键词：
Assessing Weathering Function Climate Proximal

项目摘要

Assessing Weathering as a Function of Climate in Proximal Alluvial SedimentsbyGerilyn Sorghan, Megan Elwood-Madden, EAR-1225162, University of OklahomaABSTRACTInferring a glacial influence from sedimentary facies is elusive, especially in the absence of ice-contact indicators (e.g., striated clasts). Illustrating this, inferences of glaciation on the basis of sedimentary facies have ignited controversies for sediments and sedimentary rocks from the murky depths of the Archean through the comparable light of the Pleistocene. Traditional chemical weathering indices are also ambiguous, particularly in discerning glacial/proglacial alluvial deposits from those formed in hot-arid systems. However, integrating chemical, mineralogical, and textural observations of alluvial sediments formed in temperature-precipitation extremes could provide valuable indicators of climate for sedimentary studies, particularly in distinguishing glacial from non-glacial systems. PIs propose to test the hypothesis that bulk chemistry, texture, and mineralogy, and solute fluxes of granitoid-sourced alluvial sediments show systematic and robust variations between glacial and non-glacial systems owing to differences in reactive surface area, temperature, and aqueous conditions. Accordingly, the objective of the proposed research is to quantify natural variation of chemical and physical weathering in granitoid-sourced proximal alluvial sediments in end-member glacial and non-glacial systems when other, "non-climatic" factors (e.g., provenance, drainage basin area and relief, sample grain size, sediment facies) are controlled. The ultimate goal is to establish a quantitative matrix of chemical and textural metrics to differentiate sediments formed in contrasting climates.

评估风化是近端冲积沉积物中气候的函数，莫根·埃尔伍德·马登（Megan Elwood-Madden），EAR-1225162，俄克拉荷马州欧洲大学的摘要大学，从沉积物中产生冰川影响的影响是难以捉摸的，尤其是在没有冰接触指标的情况下（例如，clasts clasts）。为此说明，基于沉积相的冰川推理引发了关于大帝的朦胧深度的沉积物和沉积岩石的争议。传统的化学风化指数也是模棱两可的，尤其是在辨别热动物系统中形成的冰川/冰期冲积沉积物时。但是，在温度至上的极端情况下整合化学，矿物学和质地观察可能会为沉积研究提供有价值的气候指标，尤其是在区分冰川和非冰川系统方面。 PI提议检验以下假设：由于反应性表面积，温度和水性条件的差异，冰川和非冰川系统之间的花岗岩产物冲积沉积物的溶质通量显示出冰川和非冰川系统之间的系统和稳健变化。因此，拟议的研究的目的是量化花岗岩产生的化学和物理风化的自然变化，而当其他“非气候”因素（例如，存在，出处，排水盆地面积，样品谷物，样品谷物，沉积物面孔）的其他因素（例如，其他“非气候”因素）时，会在末端成员冰川和非冰川系统中进行冲积。最终目标是建立化学和纹理指标的定量矩阵，以区分在对比气候下形成的沉积物。