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

该项目将试图量化温度、降水、坡度和方位角对花岗岩风化的性质、速度和产物的影响。所考察的因变量是母岩崩解成砂级物质时的模式矿物学和体积化学的变化，以及风化岩屑中砂级岩石中矿物-矿物界面的生存能力。自变量是年平均降水量、年平均温度、温度加权降水量以及发生风化的斜坡的平均坡度和方位。在不同的气候环境中选择了5个岩性相同的深成岩进行研究，从而可以对风化环境进行成对比较，其中5个自变量中的4个可以保持不变，而第5个自变量在这对中的两个成员中获得了高值和低值。界面生存分析包括以前从未应用于沉积岩石学的体视学分析方法，以及观察砂岩岩石碎片群体的新概念框架。存在开发过去气候变化的岩性指示器的潜力。

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.