The Influence of Climate and Topography on the Composition of Modern Pluton-derived Sand

该项目将试图量化的影响， 温度、降水、坡度和方位角 花岗岩风化的性质、速率和产物。 的 研究的因变量是模态矿物学的变化 以及母岩分解成沙时的整体化学反应 大小的材料，和矿物-矿物的生存能力 在风化的岩石中， grus。 自变量为年平均降水量， 年平均温度、温度加权降水量和 平均坡度和方位角的斜坡上的风化 会发生 不同气候条件下的五个岩性相同的岩体 设置已被选择用于研究，这允许成对的 比较风化环境，其中四个5 独立变量可以保持不变，而第五个 在对的两个成员中获得高值和低值。 的 界面存活分析包括体视学分析 从未应用于沉积岩学的方法 一个新的概念框架来观察岩石 沙子的碎片人口。 存在岩性开发的潜力 过去气候变化的指标。

This project will attempt to quantify the influence of temperature, precipitation, slope gradient and azimuth on the nature, rate and products of weathering of granitic rocks. The dependent variables examined are the change in modal mineralogy and bulk chemistry when the parent rock disintegrates to sand- sized material, and the survivability of mineral-mineral interfaces in sand-sized rock fragments within the weathered grus. The independent variables are mean annual precipitation, mean annual temperature, temperature-weighted precipitation, and the mean gradient and azimuth of the slopes on which weathering takes place. Five lithologically identical plutons in diverse climatic settings have been chosen for study, which allow the pair-wise comparison of weathering settings in which four of the 5 independent variables can be held constant, while the fifth attains high and low values in the two members of the pair. The analysis of interface survival encompasses stereologic analytic methods that have never been applied to sedimentary petrography before and a new conceptual framework for viewing the rock fragment population of sands. Potential exists for the development of lithological indicators of past climatic change.