Now showing items 1-10 of 192
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 ...
Lead isotope analyses of leached feldspars: Constraints on the early crustal history of the Grenville Orogen
(Elsevier, 1994-12)
Lead isotopic data on leached K-feldspars, plagioclases, and muscovite provide constraints on the premetamorphic evolution of the Grenville Orogen in Ontario and New York. A boundary between reworked Archean crust to the ...
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 ...
Magmatic and hydrothermal inclusions in carbonatite of the Magnet Cove Complex, Arkansas
(Springer-Verlag, 1977-08)
The carbonatite at Magnet Cove, Arkansas, USA contains a great variety and abundance of magmatic and hydrothermal inclusions that provide an informative, though fragmentary, record of the original carbonatite melt and of ...
The geologic role of polysulfides--Part II : The solubility of acanthite and covellite in sodium polysulfide solutions
(Elsevier, 1963-12)
The solubility of synthetic low-temperature silver sulfide (acanthite) in solutions of sodium polysulfide of different concentrations, different ratios of sulfur to sulfide and different acidity was determined. The solubility ...
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 ...
An unmetasomatized source for the Malaitan alnoite (Solomon Islands): Petrogenesis involving zone refining, megacryst fractionation, and assimilation of oceanic lithosphere
(Elsevier, 1989-08)
The Malaitan alnoite contains a rich and varied megacryst suite of unprecedented compositional range. We have undertaken trace element and isotope modeling in order to formulate a petrogenetic scheme which links the host ...
Selenium and tellurium content of stony meteorites by neutron activation
(Elsevier, 1960-04)
By neutron activation analysis the Se- and Te-content of four chondritic meteorites have been determined. The average content is 9.8 +/- 2.5 and 0.61 +/- 1.7 p.p.m., respectively. These values are lower than those already ...
Rare earth contribution to the origin of Hawaiian lavas
(Springer-Verlag, 1969-07)
Rare earth abundances were determined by neutron activation in twenty Hawaiian lavas and one diabase of known chemical and mineralogical compositions. These results demonstrate a systematic relationship between the absolute ...