Rapid and Reproducible Grain Size Measurements of Fine-Grained Sediment: The Sedigraph 5120

我们正在申请Sedigraph 5120的资金：一种基于X射线的粒度分析仪。Sedigraph是测量泥浆和富云母砂粒度的上级工具，主要是因为它是唯一一种基于质量的测量工具（由重力沉降确定），与颗粒形状无关。这在分析具有丰富板状颗粒的沉积物（例如，粘土和云母），因为片状颗粒使颗粒尺寸测量偏向较粗的尺寸，并因此在结果中引入显著的误差。对于从加拿大西海岸和加拿大科迪勒拉采集的样品的粒度分析，沉积仪是必要的，因为在许多地区，沉积物具有高云母含量和/或高粘土含量。

We are requesting funds for a Sedigraph 5120: an x-ray based grain size analyzer. The Sedigraph is the superior tool for measuring the grain size of mud and mica-rich sand, mainly because it is the only tool that makes mass-based measurements (determined from gravitational settling) that are independent of grain shape. This is particularly important when analyzing sediments with an abundance of platy grains (e.g., clay and mica), because platy grains skew grain size measurements towards coarser sizes, and hence, introduce significant errors into the results. For grain size analysis of samples acquired from the west coast of Canada and the Canadian Cordillera, a sedigraph is a necessity because in many areas, sediments have high mica contents and/or high clay fractions.