Results 71 to 80 of about 191 (175)

Chromian spinel geochemistry as a petrogenetic indicator in the chromitites and peridotites of the Bajgan Complex, Western Makran [PDF]

open access: yesپترولوژی
IntroductionEconomic chromite deposits are very common in ophiolite belts. These deposits usually occur in the uppermost horizons of the ophiolite mantle sequence or within the ultramafic cumulitic rocks at the base of the crustal sequence (González ...
Leila Vahedi   +2 more
doaj   +1 more source

MINERALOGICAL-GEOCHEMICAL AND STRUCTURAL FEATURES OF ULTRAMAFIC ROCKS AND CHROMITITES OF THE MALY BASHART CHROMITE-BEARING ZONE OF THE SOUTH KRAKA MASSIF (SOUTH URALS) [PDF]

open access: yesМинералогия, 2017
Results of structural-petrological and mineralogical-geochemical studies of chromitite-bearing zone within spinel peridotites of the South Kraka ophiolite massif are presented.
D.E. Saveliev   +2 more
doaj  

Metamorphism on Chromite Ores from the Dobromirtsi Ultramafic Massif, Rhodope Mountains (SE Bulgaria)

open access: yesGeologica Acta, 2009
Podiform chromitite bodies occur in highly serpentinized peridotites at Dobromirtsi Ultramafic Massif (Rhodope Mountains, southeastern Bulgaria). The ultramafic body is believed to represent a fragment of Palaeozoic ophiolite mantle.
J.M. GONZÁLEZ JIMÉNEZ   +3 more
doaj  

Chromitites: An Enigmatic Mantle Rock Type

open access: yesJournal of Geography (Chigaku Zasshi), 2010
Various characteristics of podiform chromitites, an enigmatic mantle rock member, are reviewed in this article. Chromitites are composed of chromian spinel, with the general formula (Mg, Fe2+)(Cr, Al, Fe3+)2O4, and silicates (mainly olivine). The Fe3+ content is generally very low, being less than 0.1 to all trivalent cations, in mantle chromian ...
openaire   +2 more sources

Chromespinel and Magnetite as Indicators for Recognition of Genesis and History of Serpentinites in Baft Ophiolite Mélange (Kerman Province in Iran) [PDF]

open access: yesJournal of Sciences, Islamic Republic of Iran, 2013
Baft ophiolite mélange is a part of Naein-Baft ophiolite (southeast of Kerman province in Iran). Serpentinites from Baft ophiolite mélange contain different types of spinels such as chromite, chromespinel, ferritchromite and magnetite which can reveal ...
N. Mohammadi, H. Ahmadipour
doaj  

Vertical depletion of ophiolitic mantle reflects melt focusing and interaction in sub-spreading-center asthenosphere. [PDF]

open access: yesNat Commun, 2022
Xiong Q   +6 more
europepmc   +1 more source

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