Now showing items 31-40 of 102
Geochemical associations and grain-size partitioning of heavy metals in lacustrine sediments
(Elsevier, 1979-07)
A sequential extraction scheme is utilized to determine the geochemical fractionation of Fe, Mn, Cr, Cu and Zn in different grain size classes for sediment samples collected from within and around Little Traverse Bay, Lake ...
Hydrocarbons and fatty acids in two cores of Lake Huron sediments
(Elsevier, 1980-08)
Compositions of aliphatic hydrocarbons and of fatty acids were analyzed in two half-meter cores of postglacial Lake Huron sediment. One core represents a continuous record of the past 450 yr of sediment accumulation; the ...
Characterization of non-equilibrium and equilibrium occurrences of paragonite/muscovite intergrowths in an eclogite from the Sesia–Lanzo Zone (Western Alps, Italy)
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 2000-04)
Coexisting muscovite and paragonite have been observed in an eclogite from the Sesia–Lanzo Zone (Western Alps, Italy). The P - T conditions of this eclogite reached 570–650 °C and 19–21 kbar and the rocks show several ...
Crystal structure of naturally occurring mercury(II) amidonitrate
(Elsevier, 1982-05)
A naturally-occurring mercuroammonium compound from Pitkin County, Colorado, is shown to be the natural analog of synthetic HgNH2NO3. The crystals are isometric, P4132 or P4332, with a = 10.254(1)A and twelve formula weights ...
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 ...
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 ...