Now showing items 1-10 of 20
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 ...
Si-Al ordering in nephelines
(Springer-Verlag, 1971-06)
Different degrees of Si-Al ordering are demonstrated to exist in nepheline on the basis of five crystal structure refinements on specimens with different geologic origins and laboratory treatments. Disorder increases in ...
Igneous pyroxenes from metamorphosed anorthosite massifs
(Springer-Verlag, 1978-02)
Anorthosites, mangerites and charnockites from metamorphosed anorthosite massifs (the Adirondacks and elsewhere) commonly contain coarsely exsolved pyroxenes with substantial amounts of exsolved orthopyroxene (in clinopyroxene) ...
The mineralogy and petrology of manganese-rich rocks from St. Marcel, Piedmont, Italy
(Springer-Verlag, 1978-10)
Manganese-rich metamorphic rocks containing violan from St. Marcel, Piedmont, Italy formed under blueschist facies conditions, yielding an unusual suite of minerals including omphacite-albite-quartz, braunite, microcline, ...
Effects of annealing on deformation textures in galena
(Springer-Verlag, 1977-01)
Experimental annealing of galena samples with known deformation histories shows that this mineral has the necessary properties to be a valuable source of information about low-grade deformational environments. Annealed ...
57 Fe NCR of Fe phases in “magnetic cassiterites”
(Springer-Verlag, 1975-09)
A pyralspite garnet from an anomalously magnetic concentrate of a pegmatitic cassiterite ore has been investigated using 57 Fe nuclear gamma-ray resonance spectroscopy. The quadrupole splitting and isomer shift values of ...
Fatty acids and hydrocarbons in surficial sediments of Lake Huron
(Elsevier, 1979-07)
Fatty acid and hydrocarbon distributions in surficial sediments from ten locations in southern Lake Huron indicate both aquatic and terrigenous recent biological sources of these geolipid materials. Normal alkanoic acids ...
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 ...