Now showing items 1-10 of 273
A revised model for the density and thermal expansivity of K 2 O-Na 2 O-CaO-MgO-Al 2 O 3 -SiO 2 liquids from 700 to 1900 K: extension to crustal magmatic temperatures
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1997-12)
A revised model for the volume and thermal expansivity of K 2 O-Na 2 O-CaO-MgO-Al 2 O 3 -SiO 2 liquids, which can be applied at crustal magmatic temperatures, has been derived from new low temperature (701–1092 K) density ...
Historical changes in sediments of Pyramid Lake, Nevada, USA: consequences of changes in the water balance of a terminal desert lake
(Kluwer Academic Publishers; Springer Science+Business Media, 1994-01)
Sediment cores from the shallow and deep basins of Pyramid Lake, Nevada, revealed variations in composition with depth reflecting changes in lake level, river inflow, and lake productivity. Recent sediments from the period ...
Yunia dichotoma, a lower devonian plant from Yunnan, China
(Elsevier, 1991-07-10)
This paper describes a new genus and species, Yunia dichotoma, collected from the Posonchong Formation of Siegenian age in the Wenshan district of Yunnan, China. The spiny axes are characterized by cruciate dichotomy. ...
Comparison of garnet-biotite, calcite-graphite, and calcite-dolomite thermometry in the Grenville Orogen; Ontario, Canada
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1999-02)
The Elzevir Terrane of the Grenville Orogen in southern Ontario contains metapelites and abundant graphitic marbles that were regionally metamorphosed from the upper greenschist to upper amphibolite facies. Comparative ...
Chlorite control of correlations between strain and anisotropy of magnetic susceptibility
(Elsevier, 1990)
Anisotropy of magnetic susceptibility (AMS) has in the past been used as an indicator of finite strain; mathematical relationships between the measured AMS ellipsoid and the finite strain ellipsoid in slates are numerous. ...
Pyrometamorphism and partial melting of shales during combustion metamorphism: mineralogical, textural, and chemical effects
(Springer-Verlag, 1992-12)
Eocene shales metamorphosed by a naturally ignited coal seam in the Powder River Basin, Wyoming record a continuum of mineralogic and textural changes from relatively unaltered shale to melt developed during pyrometamorphism. ...
Sources, degradation and recycling of organic matter associated with sinking particles in Lake Michigan
(Elsevier, 1993-01)
Sediment trap material collected at five depths from two locations in Lake Michigan has been studied to determine the sources of particulate organic matter and the early diagenetic changes which occur during sinking of ...
Application of gas analysis of jasperoid inclusion fluids to exploration for micron gold deposits
(Elsevier, 1991-12)
Quadrupole mass spectrometric analyses of inclusion gases in jasperoid from the Carlin and Standard sediment-hosted micron gold deposits in Nevada show that mineralized areas exhibit better correlations between H2O---CO2 ...
Precambrian evolution of the climate system
(Elsevier, 1990-08)
Climate is an important environmental parameter of the early Earth, likely to have affected the origin and evolution of life, the composition and mineralogy of sedimentary rocks, and stable isotope ratios in sedimentary ...