Now showing items 21-30 of 82
Organic matter and copper mineralization at White Pine, Michigan, U.S.A.
(Elsevier, 1992-09-10)
Indigenous and exogenous organic matter in sediments of the North American Midcontinent Rift were involved in precipitation of Cu-bearing minerals during main- and second-stage mineralization events at White Pine, Michigan. ...
Complete chemical analyses of metamorphic hornblendes: implications for normalizations, calculated H 2 O activities, and thermobarometry
(Springer-Verlag, 1991-10)
Twenty-two hornblendes separated from amphibolites and granulites of the Grenville Orogen of Ontario have been quantitatively analyzed for major and minor elements by electron microprobe, for FeO/Fe 2 O 3 by wet chemistry, ...
Mineralized and unmineralized calderas in Spain; Part II, evolution of the Rodalquilar caldera complex and associated gold-alunite deposits
(Springer-Verlag, 1990-12)
The Rodalquilar caldera complex is located in the western part of the Cabo de Gata volcanic field in southeastern Spain and is the first documented example of epithermal gold-alunite mineralization within a caldera in ...
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 ...
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 ...