Now showing items 61-70 of 192
Petrology of ultramafic lamprophyres from the Beaver Lake area of Eastern Antarctica and their relation to the breakup of Gondwanaland
(Springer-Verlag; Springer-Verlag Wien, 2002-03)
Mesozoic melilite-bearing ultramafic lamprophyres are developed as sill, dyke and plug-like intrusive bodies in the East Antarctic Beaver Lake area. They consist of varying amounts of olivine, melilite, phlogopite, nepheline, ...
Extraction and carbon isotope analysis of CO2 from scapolite in deep crustal granulites and xenoliths
(Elsevier, 1994-01)
Carbon isotope compositions of scapolite from granulite facies gneisses and lower crustal xenoliths document the composition and constrain the source of carbon in scapolite from the lower crust. CO2 is extracted from ...
Corrensite and mixed-layer chlorite/corrensite in metabasalt from northern Taiwan: TEM/AEM, EMPA, XRD, and optical studies
(Springer-Verlag, 1990-03)
Many chloritic minerals in low-grade metamorphic or hydrothermally altered mafic rocks exhibit abnormal optical properties, expand slightly upon glycolation (“expandable chlorite”) and/or have excess Al VI relative to Al ...
High-temperature heat capacity and thermodynamic properties for end-member titanite (CaTiSiO 5 )
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 2001-04)
The heat capacity of end-member titanite and (CaTiSiO 5 ) glass has been measured in the range 328–938 K using differential scanning calorimetry. The data show a weak λ-shaped anomaly at 483 ± 5 K, presumably associated ...
Detection of bone preservation in archaeological and fossil samples
(Elsevier, 1989)
Several methods for assessing the preservation of the organic and inorganic components of bone are discussed. Aspects of bone composition (i.e. specific trace element concentrations and stable isotope ratios) provided ...
The significance of metamorphic fluorite in the Adirondacks
(Elsevier, 1978-11)
Thermodynamic calculations for selected silicate-oxide-fluorite assemblages indicate that several commonly occurring fluorite-bearing assemblages are restricted to relatively narrow [function of (italic small f)]O2-[function ...
Ferric-ferrous ratios, H 2 O contents and D/H ratios of phlogopite and biotite from lavas of different tectonic regimes
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1996-12)
Complete chemical analyses, including ferric and ferrous iron, H 2 O contents and δD values for 16 phlogopite and biotite and 2 hornblende separates are presented. Samples were obtained from volcanic rocks from four ...
Fluid inclusion gas chemistry in east Tennessee Mississippi Valley-type districts: Evidence for immiscibility and implications for depositional mechanisms
(Elsevier, 1992-01)
Analyses of fluid inclusion gases from Mississippi Valley-type districts in east Tennessee reveal the presence of several distinct aqueous solutions and vapors that were part of the mineralizing process. Inclusion contents ...
High-pressure transformations in CaSiO 3
(Springer-Verlag, 1974-09)
Wollastonite transforms to a triclinic high-pressure polymorph, wollastonite II, at pressures > 25 kb. The equilibrium boundary [P(bars)=-4.7× T °C+32.810] has a rather flat negative P-T slope. The rapid reactivity of the ...
Synthetic fluid inclusions in natural quartz. IV. Chemical analyses of fluid inclusions by SEM/EDA: Evaluation of method
(Elsevier, 1988-05)
The compositions of individual synthetic fluid inclusions in the systems NaCl-KCl, NaCl-CaCl2 and NaCl-KCl-CaCl2 have been semi-quantitatively determined by energy dispersive analysis of precipitates produced during thermal ...