Now showing items 21-30 of 61
Characterization of sedimentary humic matter by alkaline hydrolysis
(Elsevier, 1983)
Humic matter fractions from modern sediments of Lake Huron and Lake Michigan have been compared. Large yields of saccharinic acids from alkaline hydrolysis suggest that these fractions contain large portions of carbohydrate ...
The stability of sodalite in the system NaAlSiO4-NaCl
(Elsevier, 1989-08)
The reaction SODALITE = [beta]-nepheline + NaCl (s) was reversed in solid-medium apparatus (923 K, 7.6-8.0 kbar; 973 K, 7.4-7.6 kbar; 1073 K, 7.8-8.0 kbar; 1173 K, 8.4-8.6 kbar) and the reaction SODALITE = carnegieite + ...
Oxygen isotope variations in granulite-grade iron formations: constraints on oxygen diffusion and retrograde isotopic exchange
(Springer-Verlag, 1988-04)
The oxygen isotope ratios of various minerals were measured in a granulite-grade iron formation in the Wind River Range, Wyoming. Estimates of temperature and pressure for the terrane using well calibrated geothermometers ...
Chlorite-illite/muscovite interlayered and interstratified crystals: A TEM/STEM study
(Springer-Verlag, 1984-12)
Phyllosilicates in rocks which are transitional from mudstone to slate from Lehigh Gap, Pa., have been studied by a variety of techniques, including high resolution Transmission Electron Microscopy and Analytical Electron ...
An evaluation of garnet-clinopyroxene geothermometry in granulites
(Springer-Verlag, 1983-11)
Four new formulations of the garnet-clinopyroxene geothermometer (Ellis and Green 1979; Ganguly 1979; Saxena 1979; Dahl 1980) have been evaluated in the Adirondacks and five other granulite terranes using results from 94 ...
Organic geochemistry of Cretaceous black shales from the Galicia Margin, Ocean Drilling Program Leg 103
(Elsevier, 1988)
Organic-carbon-rich "black shales" from three different Cretaceous episodes sampled during Ocean Drilling Program Leg 103 have been studied by organic geochemical methods. Rock-Eval analysis, carbon isotope data, and lipid ...
Activity variations attending tungsten skarn formation, Pine Creek, California
(Springer-Verlag, 1985-05)
An integrated geochemical analysis of the well-exposed Pine Creek, California tungsten skarn deposit has been undertaken to evaluate changes in chemical gradients across various lithologies. Thermodynamic calculations using ...
Sulfur- and strontium-isotopic geochemistry of celestite, barite and gypsum from the Mesozoic basins of northeastern Mexico
(Elsevier, 1980-1981)
The Mesozoic sedimentary basin of northern Mexico contains large limestone-hosted stratiform "mantos" of celestite and barite that appear to have formed by carbonate replacement. We have measured the isotopic compositions ...