Now showing items 31-40 of 61
Phase relations inferred from field data for mn pyroxenes and pyroxenoids
(Springer-Verlag, 1980-12)
Electron microprobe analysis of manganese silicates from Balmat, N.Y., has helped elucidate phase relations for Mn-bearing pyroxenes and pyroxenoids. A compilation of these data along with published and unpublished analyses ...
Phlogopite-chlorite reaction mechanisms and physical conditions during retrograde reactions in the Marble Formation, Franklin, New Jersey
(Springer-Verlag, 1984-12)
A retrograde assemblage in a specimen from the Franklin Marble Formation containing an unusual occurrence of three micas has been studied. Microprobe analyses of the margarite, muscovite and phlogopite reveal significant ...
Heat capacity measurements for cryolite (Na3AlF6) and reactions in the system Na---Fe---Al---Si---O---F
(Elsevier, 1987-12)
The heat capacity of cryolite (Na3AlF6) has been measured from 7 to 1000 K by low-temperature adiabatic and high-temperature differential scanning calorimetry. Low-temperature data were obtained on material from the same ...
Occurrence, chemistry, and origin of immiscible silicate glasses in a tholeiitic basalt: A TEM/AEM study
(Springer-Verlag, 1986-09)
The occurrence and chemistry of immiscible silicate glasses in a tholeiite mesostasis from the Umtanum formation, Washington, were investigated with transmission electron microscopy and analytical electron microscopy ...
Neodymium and strontium isotopic constraints on the origin of the peraluminous granitoids of the South Mountain Batholith, Nova Scotia, Canada
(Elsevier, 1988-07-20)
Nd isotopic data from the South Mountain batholith show that its peraluminous granitic rocks have considerably higher [epsilon]tNd (t=372 Ma) values (-5.2 to -1.4) than the extensive flyschoid country rocks (-11.2 to -8.7). ...
Generation of high-silica rhyolite: A Nd, Sr, and O isotopic study of Sierra La Primavera, Mexican Neovolcanic Belt
(Springer-Verlag, 1988-10)
High-silica rhyolites of the Sierra La Primavera, a late Pleistocene center near Guadalajara, are extremely Sr-poor (0.3–1.3 ppm), yet (with one exception) values of 87 Sr/ 86 Sr i are relatively low at 0.7041–0.7048. ...
The heat capacity of a natural monticellite and phase equilibria in the system CaO-MgO-SiO2-CO2
(Elsevier, 1986-07)
The heat capacity of a natural monticellite (Ca1.00Mg.09Fe.91Mn.01Si0.99O3.99) measured between 9.6 and 343 K using intermittent-heating, adiabatic calorimetry yields Cp0(298) and S2980 of 123.64 +/- 0.18 and 109.44 +/- ...
The thermodynamic properties and phase relations of some minerals in the system CaO-AI2O3-SiO2-H2O
(Elsevier, 1980-01)
The heat capacities of lawsonite, margante, prehnite and zoisite have been measured from 5 to 350 K with an adiabatic-shield calorimeter and from 320 to 999.9 K with a differential-scanning calorimeter. At 298.15 K, their ...
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. ...