Results 21 to 30 of about 37,548 (250)

Newly found rock-forming minerals in the eastern part of the Slovak Ore Mountains, Western Carpathians, Slovakia [PDF]

open access: yesActa Montanistica Slovaca, 1996
This work focuses on first occurrences of more than 20 silicate minerals in the study area. In addition to amphiboles group (six minerals), pyroxenes (three minerals), different varieties of garnets and schist silicates and some Mn-rich minerals are ...
Zábranský František, Faryad Shah Wali
doaj  

Determining the Pyroxene Mineralogies of Vestoids

open access: yesThe Planetary Science Journal, 2023
Bulk pyroxene compositions were calculated for a number of V-type asteroid spectra using formulae derived by Burbine et al. These formulae were derived by analyzing HED (howardite, eucrite, and diogenite) meteorites and calculate bulk Fs (mol%) and Wo ...
T. H. Burbine   +3 more
doaj   +1 more source

PETROGRAPHY AND MICROTEXTURAL CHARACTERISTICS OF GRANODIORITE FROM WASIMI, SOUTHWESTERN NIGERIA [PDF]

open access: yesEarth Science Malaysia, 2020
Rock samples of granodiorite from Wasimi were studied in detail to determine the minerals, mineral associations and the different micro-texture present in order to unravel the processes that were involved during the cooling of the magma.
E. J. Oziegbe   +2 more
doaj   +1 more source

Magnetic Anisotropy in Single Crystals: A Review

open access: yesGeosciences, 2018
Empirical relationships between magnetic fabrics and deformation have long served as a fast and efficient way to interpret rock textures. Understanding the single crystal magnetic properties of all minerals that contribute to the magnetic anisotropy of a
Andrea R. Biedermann
doaj   +1 more source

Mineralogical Characterization of Baptistina Asteroid Family: Implications for K/T Impactor Source

open access: yes, 2011
Bottke et al. (2007) linked the catastrophic formation of Baptistina Asteroid Family (BAF) to the K/T impact event. This linkage was based on dynamical and compositional evidence, which suggested the impactor had a composition similar to CM2 carbonaceous
Candal, Alvaro Alvarez   +10 more
core   +1 more source

Theoretical Spectra of Terrestrial Exoplanet Surfaces [PDF]

open access: yes, 2012
We investigate spectra of airless rocky exoplanets with a theoretical framework that self-consistently treats reflection and thermal emission. We find that a silicate surface on an exoplanet is spectroscopically detectable via prominent Si-O features in ...
Batalha   +28 more
core   +2 more sources

Cosmogenic 3He exposure dating in mafic rocks by “Virtual mineral separation” of pyroxene [PDF]

open access: yesGeochronology
We describe a “virtual mineral separation” method for measuring the cosmogenic 3He concentration in pyroxene in mafic rocks that consist mainly of plagioclase and pyroxene, without physically separating the minerals. This approach is significantly faster
M. Bergelin   +4 more
doaj   +1 more source

Dust absorption and scattering in the silicon K-edge [PDF]

open access: yes, 2019
The composition and properties of interstellar silicate dust are not well understood. In X-rays, interstellar dust can be studied in detail by making use of the fine structure features in the Si K-edge.
Costantini, E.   +7 more
core   +3 more sources

MINERAL CHEMISTRY OF FELSIC EXTRUSIVE ROCKS OF THE EAST BAYMAK AREA OF THE SOUTHERN URALS AND APROBLEM OF HYBRIDISM IN THEIR GENESIS [PDF]

open access: yesМинералогия, 2018
The Baymak ore district hosts numerous small Au-rich massive sulfide polymetallic deposits, which is a distinctive feature in comparison with other regions of the West-Magnitogorsk zone (Seravkin, 1986). According to geophysical data, the Baymak block is
A.M. Kosarev   +3 more
doaj  

Paragenesis relations study of wollastonite – pyroxene – garnet mineral assemblage in Vejeh Skarn (North East Isfahan) [PDF]

open access: yesپترولوژی, 2017
The Vejeh Skarn is located at 70 km Northeast of Isfahan. The Vejeh intrusive body with granodiorite to tonalite composition have been intruded the lower Cretaceous marl carbonate which caused the formation of skarn rocks.
Ahmad Jamshidzaii   +2 more
doaj   +1 more source

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