增生地体的地貌表现:厄勒冈州Klamath山脉

在厄勒冈州两南部与加州西北Klamath山脉的地壳组成研究中,出现了有关增生地体或构造-地层地体盛行模式的几个概念。在该区识别出了三十多个地体,它们就位于晚古生界和晚白垩世。这些地体的鉴别主要是根据极为显著的岩性,构造界线特点差异,对某些地体而言,利用了古地磁特点的显著差别。尽管在那里以及在其他地体组合区工作的人们注意到了相邻地体间在地形、地貌上有截然的差别,但是对于这些组合地貌变化的系统分析且很少有报导。本文对于厄勒冈区Klamath地体的研究目的在于:(1)定性和定量地定义和描述已知(已经填出)地体的地貌特征;(2)确定一套组合内的地体是否具有足够特征地貌标志,使得能够在航空图象和卫星图象中识别其存在,而且能更好地圈定其问的界线;(3)对于地貌信息作为识别地体就位方式的线索进行估价,尤其是对于地貌几何与构造标志的相关性作一评价。这项研究把形态测量应用到传统地形数据库与数字地形数据库上,有时应用到Landsat/Spot图像上。

Trace Metal Analysis of Karuk Traditional Foods in the Klamath River

This study evaluates the presence of trace metals in Klamath Riverwater and three important Karuk traditional foods: freshwater mussels (Gonidea angulata), Chinook Salmon (Oncorhynchus tshawytscha) and Rainbow Trout (Oncorhynchus mykiss). Samples of these traditional foods together with water samples were collected from the Klamath River and measured for the total chromium (Chromium), cobalt (Co), copper (Cu), cadmium (Cd), tin (Sn), and lead (Pb) by inductively coupled plasma-mass spectrometry (ICP-MS). We found that cultural-use species in the Klamath and its tributaries are accumulating higher levels of lead, cadmium and tin downstream of a known Superfund site. Neither water, fish, nor mussel samples exceeded maximum intake levels of metal doses mandated by state or federal agencies for consumption intakes of1.4 Lper day of water,0.5 kgper meal per day for fish, and0.043 kgper meal for 30 meals per year1.