Geochemical signatures of parent materials and lake sediments in northern Minnesota

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Show simple item record Mellicant, Emily 2017-04-20T19:31:04Z 2017-04-20T19:31:04Z 2017-05-01 en_US
dc.description.abstract The importance of local parent material has been recognized as a fundamental control on the geochemistry of lake sediments, but there have been relatively few broad-scale surveys of catchment sources of terrigenous lake sediments. In this paper, I present a geochemical study of catchment parent materials and lake sediments from four lakes in Northern Minnesota. Similar climate and vegetation conditions are present at all four lakes, which vary mainly in catchment parent material and lake morphometry. Geochemical data including major, trace and rare earth elements (REEs) from catchment parent material samples was compared with lake sediment geochemical data using PCA, linear regression, geological indices and elemental ratios. In homogenous till-dominated catchments, patterns of elemental variation in the catchment till could be extended to predict elemental concentrations in the lake sediments. Simple ratios, which are commonly used to analyze lake sediment geochemical data, were not good predictors of lake sediment composition, however. Catchments with mixed bedrock and till were compositionally heterogeneous, and comparison with lake sediments was difficult. Lack of grain size control and biogenic silica measurements further confounded analysis. However, ΣREE/Y ratio was found to be diagnostic of the catchment parent materials and present within the lake sediments. This study makes a contribution to an improved understanding of lacustrine sedimentary archives by analyzing the spatial linkages among catchment, water and sedimentary geochemistry. en_US
dc.description.sponsorship National Science Foundation en_US
dc.language.iso en_US en_US
dc.publisher Kansas State University en
dc.subject Sedimentary geochemistry en_US
dc.subject Lake sediments en_US
dc.subject Lake catchments en_US
dc.title Geochemical signatures of parent materials and lake sediments in northern Minnesota en_US
dc.type Thesis en_US Master of Arts en_US
dc.description.level Masters en_US
dc.description.department Department of Geography en_US
dc.description.advisor Kendra K. McLauchlan en_US 2017 en_US May en_US

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