Browsing Геология России by Title
- DSpace Home
- →
- Геология России
- →
- Browsing Геология России by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing Геология России by Title
Now showing items 2635-2654 of 39195
-
(1995)The recently proposed compositional classification scheme for meteoritic chondrules divides the chondrules into groups depending on the composition of their two major phases, olivine (or pyroxene) and the mesostasis, both ...
-
(2004)Chondrule formation appears to have been a major event in the early solar system, but chondrule properties do not allow us to distinguish between several possible formation mechanisms. The physical nature of the precursors, ...
-
(2002)Various techniques are available to quantify recharge; however, choosing appropriate techniques is often difficult. Important considerations in choosing a technique include space/time scales, range, and reliability of ...
-
(Минералогический музей им. А.Е. Ферсмана РАН (Москва), 2012)Новый минерал группы чевкинита христофшеферит-(Ce) найден в эруптивном обломке высокомарганцевой метасоматической породы на горе Вингертсберг (вулкан Лаахер Зее, близ г. Мендиг, горы Айфель, Рейнланд-Пфальц, Германия) в ...
-
(1999)The major platinum-group elements (PGE) concentrations in layered intrusions are typically associated with zones in which the sulfide abundance begins to increase. In a number of layered intrusions, there is also a distinct ...
-
(2004)The morphology of diamond crystals during resorption in the silicate melt at high PT parameters depends on a fluid presence in the system. This is related to the fact that refraction in the <110> direction of a rounded ...
-
(1989)In the Kostomuksha iron district, located in the Archean granite-greenstone region, komatiites and komatiitic basalts appear among volcanic rocks of the Kontokskaya and the Gimoly groups, as northwest-striking zones. The ...
-
(2001)Исследованы хромшпинелиды в сульфидных рудах Ишкининского, Ивановского и Дергамышского медно-кобальтовых месторождений в ультрамафитах Главного Уральского разлома. Хромшпинелиды в рудах Ишкининского и Ивановского месторождений ...
-
(1989)Both of the main morphological types of chromiferous 'upper mantle' amphiboles and micas, i.e. the interstitial and poikilitic, previously found in inclusions from alkalic basalts, have now been identified in ultramafic ...
-
(2003)Chromitite segregations in dunites of the Uktus Uralian-Alaskan-type complex (Central Urals, Russia) display large variation of the chromite composition: Cr/(Cr+Al)=0.46-0.77, Fe2+/(Fe2++Mg)=0.28-0.66, and Fe3+/(Fe3++Fe2 ...
-
CHROMITE IN KOMATIITES, II. MODIFICATION DURING GREENSCHIST TO MID-AMPHIBOLITE FACIES METAMORPHISM (2000)Chromite compositions in komatiites are influenced by metamorphic processes, particularly above 500°C. Metamorphosed chromite is substantially more iron rich than igneous precursors, as a result of Mg–Fe exchange with ...
-
(2003)Chromite in ordinary chondrites (OC) can be used as a shock indicator. A survey of 76 equilibrated H, L and LL chondrites shows that unshocked chromite grains occur in equant, subhedral and rounded morphologies surrounded ...
-
(2002)This paper covers the results of a study of ore and accessory chromite mineralizations in an ultramafic rock complex of the Valizhgen Peninsula. It was found that the chromite mineralization belongs to the podiform type, ...
-
(1990)New vanadium minerals recently discovered in metamorphic rocks and pyrite ores include schreyerite, V2Ti3O9, and vuorelainenite (Mn, Fe)V2O4, the end member of the chromium-vanadium manganospinel series. We succeeded in ...
-
(2004)Radioactive core samples containing elevated concentrations of Cr from a high level nuclear waste plume in the Hanford vadose zone were studied to asses the future mobility of Cr. Cr(VI) is an important subsurface contaminant ...
-
(1996)Results from new optical studies of natural magnussonite, including observed weak birefringence and distinct pleochroism, indicate that the symmetry of the mineral structure may be lower than cubic. The optical absorption ...
-
(1996)A comprehensive revision of ammonites, which were collected by the scientific group of M.S. Mesezhnikov in 1985, shows the high taxonomic diversity of these fossils, and affords an opportunity to refine zonal and intrazonal ...
-
(PANGAEA, 2004-09-29)An isotope-geochronological study of Neogene-Quaternary igneous rocks from the Urup Island (Greater Kuril Ridge) was carried out. It was established that magmatic activity in the island developed during the last 10 my and ...
-
(Cambridge University Press, 1983)
Now showing items 2635-2654 of 39195