Now showing items 41-50 of 192
Mineralogical and biological controls on the Fe/Ca and Mn/Ca ratios of lacustrine carbonate allochems
(Elsevier, 1983-01)
The Fe/Ca and Mn/Ca ratios of lacustrine carbonate allochems are primarily controlled by the mineralogy of the carbonate polymorph. However, these ratios are subject to a significant degree of biological control among ...
Stable isotope geochemistry and phase equilibria of coesite-bearing whiteschists, Dora Maira Massif, western Alps
(Springer-Verlag, 1993-05)
Peak metamorphic temperatures for the coesite-pyrope-bearing whiteschists from the Dora Maira Massif, western Alps were determined with oxygen isotope thermometry. The δ 18 O( smow ) values of the quartz (after coesite) ...
The partial molar volume, thermal expansivity, and compressibility of H 2 O in NaAlSi 3 O 8 liquid: new measurements and an internally consistent model
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1997-10)
The molar volumes of 19 hydrous albitic liquids (1.9 to 6.1 wt% H 2 O total ) were determined at one bar and 505–765 K. These volume data were derived from density measurements on hydrous glasses at 298 K, followed by ...
Petrology of spinel harzburgite xenoliths from the Kishb Plateau, Saudi Arabia
(Springer-Verlag, 1986-07)
Two spinel harzburgite xenoliths from a Pleistocene alkali basalt unit erupted at the northwestern corner of the Tertiary Kishb Plateau (Saudi Arabia) are characterized by an incipient transition from protogranular to ...
Geochemical associations and grain-size partitioning of heavy metals in lacustrine sediments
(Elsevier, 1979-07)
A sequential extraction scheme is utilized to determine the geochemical fractionation of Fe, Mn, Cr, Cu and Zn in different grain size classes for sediment samples collected from within and around Little Traverse Bay, Lake ...
Calculation and application of clinopyroxene-garnet-plagioclase-quartz geobarometers
(Springer-Verlag, 1988-09)
Recently published thermodynamic and experimental data in a variety of chemical systems have been evaluated to derive Gibbs free energies for hedenbergite and pyrope. These were used to calculate the geobarometric equilibria
Hydrocarbons and fatty acids in two cores of Lake Huron sediments
(Elsevier, 1980-08)
Compositions of aliphatic hydrocarbons and of fatty acids were analyzed in two half-meter cores of postglacial Lake Huron sediment. One core represents a continuous record of the past 450 yr of sediment accumulation; the ...
Characterization of non-equilibrium and equilibrium occurrences of paragonite/muscovite intergrowths in an eclogite from the Sesia–Lanzo Zone (Western Alps, Italy)
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 2000-04)
Coexisting muscovite and paragonite have been observed in an eclogite from the Sesia–Lanzo Zone (Western Alps, Italy). The P - T conditions of this eclogite reached 570–650 °C and 19–21 kbar and the rocks show several ...