Now showing items 21-30 of 192
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, ...
Mineral inclusions in pyrope crystals from Garnet Ridge, Arizona, USA: implications for processes in the upper mantle
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1999-05)
Mineral inclusions in pyrope crystals from Garnet Ridge in the Navajo Volcanic Field on the Colorado Plateau are investigated in this study with emphasis on the oxide minerals. Each pyrope crystal is roughly uniform in ...
The effect of Al 3+ , Fe 3+ , and Ti 4+ on the configurational heat capacities of sodium silicate liquids
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1998-12)
The heat capacities of 29 glasses and supercooled liquids in the Na 2 O-SiO 2 , Na 2 O-Al 2 O 3 -SiO 2 , Na 2 O-(FeO)-Fe 2 O 3 -SiO 2 , and Na 2 O-TiO 2 -SiO 2 systems were measured in air from 328 to 998 K with a differential ...
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 ...
Sedimentary biomarker and isotopic indicators of the paleoclimatic history of the Walker Lake basin, western Nevada
(Elsevier, 1988)
Walker Lake, a terminal saline lake in western Nevada, has experienced major fluctuations in its water level due to changes in the regional climate during Quaternary times. As part of a paleo-climatological study of western ...
Lacustrine organic geochemistry--an overview of indicators of organic matter sources and diagenesis in lake sediments
(Elsevier, 1993-09)
The factors affecting the amounts and types of organic matter in lacustrine sediments are summarized in this review, and synthesis, of published studies. Biota living in the lake and in its watershed are the sources of the ...
Comparison of lipid character of sediments from the Great Lakes and the Northwestern Atlantic
(Elsevier, 1984)
Geolipid compositions of surficial sediments from Lake Michigan, Lake Huron, and from three locations in the Northwestern Atlantic were determined to compare source inputs and alteration processes in different sedimentary ...
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 ...
Contrasting serpentinization processes in the eastern Central Alps
(Springer-Verlag, 1988-08)
Stable isotope compositions have been determined for serpentinites from between Davos (Arosa-Platta nappe, Switzerland) and the Valmalenco (Italy). δD and δ 18 O values (−120 to −60 and 6–10‰, respectively) in the Arosa-Platta ...