Now showing items 141-150 of 193
Low-temperature heat capacities of synthetic pyrope, grossular, and pyrope60grossular40
(Elsevier, 1980-05)
The heat capacities of synthetic pyrope (Mg3Al2Si2O12), grossular (Ca3Al2Si3O12) and a solid solution pyrope60grossular40 (Mg1.8Ca1.2Al2Si3O12) have been measured by adiabatic calorimetry in the temperature range 10-350 ...
Organic geochemistry of suspended and settling particulate matter in Lake Michigan
(Elsevier, 1984-03)
Organic matter contained in particulate matter in Lake Michigan waters and sediments has been characterized by C/N ratios and by distributions of biomarker fatty acids, alkanols, sterols, and aliphatic hydrocarbons. ...
Origin and evolution of formation waters, Alberta Basin, Western Canada Sedimentary Basin. II. Isotope systematics and water mixing
(Elsevier, 1990)
Isotopic measurements (Sr, O, D) on formation waters from the Alberta Basin have been made, covering a stratigraphic range from Devonian to Upper Cretaceous. These measurements, combined with chemical compositional trends, ...
Petrogenesis of alkalic and calcalkalic volcanic rocks of Mormon Mountain Volcanic Field, Arizona
(Springer-Verlag, 1986-12)
The Cenozoic Mormon Mountain Volcanic Field (MMVF) of northern Arizona is situated in the transition zone between the Basin and Range and the Colorado Plateau. It is composed of alkalic to sub-alkalic basalts and calcalkalic ...
Experimental investigation and application of the equilibrium rutile + orthopyroxene = quartz + ilmenite
(Springer-Verlag, 1993-03)
Equilibria in the Sirf (Silica-Ilmenite-Rutile-Ferrosilite) system: have been calibrated in the range 800–1100° C and 12–26 kbar using a piston-cylinder apparatus to assess the potential of the equilibria for geobarometry ...
REE/Fe variations in hydrothermal sediments: Implications for the REE content of seawater
(Elsevier, 1989-03)
Seafloor hydrothermal vent solutions exhibit rare earth element (REE) enrichments ranging between one to three orders of magnitude greater than average seawater. To assess the impact of these hydrothermal inputs on ocean ...
Variability of early diagenesis in lake sediments: Evidence from the sedimentary geolipid record in an isolated tarn
(Elsevier, 1994-02-10)
A 0.5-m-long core of sediment from Coburn Mountain Pond, Maine, U.S.A., has provided a virtually undisturbed and continuous record of sediment deposition for the last 200 yr in this small, essentially pristine tarn. Organic ...
Heat capacities of Fe 2 O 3 -bearing silicate liquids
(Springer-Verlag, 1992-04)
Direct measurements of liquid heat capacity, using a Setaram HT1500 calorimeter in step-scanning mode, have been made in air on six compositions in the Na 2 O-FeO-Fe 2 O 3 -SiO 2 system, two in the CaO-FeO-Fe 2 O 3 -SiO 2 ...
Geolipid, pollen and diaton stratigraphy in postglacial lacustrine sediments
(Elsevier, 1984)
As part of our continuing investigation of specific compounds as organic matter indicators in lake bottoms, we have examined geolipids, pollen and diatoms in sediments from different periods in the postglacial history of ...