Now showing items 51-60 of 307
Composite magnetic anisotropy fabrics: experiments, numerical models and implications for the quantification of rock fabrics
(Elsevier, 1993-04-15)
Magnetic fabrics from rocks with multiple mineral-preferred orientations may have anisotropy ellipsoids whose shape and orientation arise from the addition of two or more component fabrics. Our numerical models and experiments ...
Age and petrogenesis of the Sarmiento ophiolite complex of southern Chile
(Elsevier, 1992)
Zircon fractions separated from fine-grained plagiogranites, interpreted to be cogenetic with the mafic rocks of the Sarmiento ophiolite complex in southern Chile, yield slightly to grossly discordant age patterns for which ...
Lacustrine organic geochemistry--an overview of indicators of organic matter sources and diagenesis in lake sediments
(Elsevier, 1993-09)
The factors affecting the amounts and types of organic matter in lacustrine sediments are summarized in this review, and synthesis, of published studies. Biota living in the lake and in its watershed are the sources of the ...
Comparison of lipid character of sediments from the Great Lakes and the Northwestern Atlantic
(Elsevier, 1984)
Geolipid compositions of surficial sediments from Lake Michigan, Lake Huron, and from three locations in the Northwestern Atlantic were determined to compare source inputs and alteration processes in different sedimentary ...
The Nd-, Sr- and Pb-isotopic character of lavas from Taal, Laguna de Bay and Arayat volcanoes, southwestern Luzon, Philippines: Implications for arc magma petrogenesis
(Elsevier, 1994-07-30)
Following the amalgamation of a collage of pre-Neogene terranes largely by strike-slip and convergence mechanisms to form the Philippine islands, volcanic chains, related to oppositely dipping subduction zones, developed ...
Late Cenozoic changes in atmospheric circulation deduced from North Pacific eolian sediments
(Elsevier, 1982-09)
Isolation and analysis of the eolian component of late Cenozoic pelagic sediments from the North Pacific provides direct information concerning changes in atmospheric circulation. A 50% increase in intensity of both the ...
The peterson limestone -- early cretaceous lacustrine carbonate deposition in western wyoming and southeastern idaho
(Elsevier, 1980-08)
The lacustrine Peterson Limestone of western Wyoming and southeastern Idaho comprises six lithofacies throughout its 20,000 km2 aerial extent. These are: (1) calcareous sandstone and shale, (2) red nodular limestone, (3) ...
Secondary magnetizations from the Clinton-type iron ores of the Silurian Red Mountain Formation, Alabama
(Elsevier, 1984-03)
From 27 (out of a total of 29) sites a characteristic pre-folding magnetization has been obtained with D = 150[deg], I = +20[deg], [alpha]95 = 3.5[deg], and paleopole at 38[deg]N, 132[deg]E. However, we conclude from a ...
Thermal stresses at the oceanic-continental margin
(Elsevier, 1967-03)
Dissimilar temperature profiles beneath oceans and continents give rise to thermoelastic stresses at and adjacent to the oceanic-continental margin. Computations of the magnitude and orientation of the maximum shear stress ...