Hercynite in (cordierite)-corundum-spinel-phlogopite-plagioclase-rock from Higo-gneiss
نویسندگان
چکیده
منابع مشابه
Oxygen isotopic disequilibrium in plagioclase–corundum–hercynite xenoliths from the Voisey's Bay Intrusion, Labrador, Canada
Xenoliths of metamorphic country rocks are locally abundant within breccia sequences in gabbroic to troctolitic rocks of the Voisey's Bay Intrusion, Labrador, Canada. Thermochemical interaction with mafic magma has produced restite assemblages in the xenoliths that are composed of Ca-rich plagioclase, corundum, hercynite and minor magnetite. Hercynite was produced as a result of the breakdown o...
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It is well known that oriented iron and titanium oxide inclusions occur in pyroxenes and plagioclase of anorthosites and granulites, and they are attributed to exsolution at subsolidus conditions. The oxides occur as needles or platelets. In this study, we determine the morphology of oxide needles as well as their orientation in plagioclase (An 30–35) in anorthosite gneiss from the Adirondack m...
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The transformation on heating LiCoMnO4, with a spinel structure, to LiCoMnO3, with a cation-disordered rock salt structure, accompanied by loss of 25% of the oxygen, has been followed using a combination of diffraction, microscopy and spectroscopy techniques. The transformation does not proceed by a topotactic mechanism, even though the spinel and rock salt phases have a similar, cubic close-pa...
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Introduction: Isotopic studies of the very refractory solar condensates can potentially provide important constraints on the initial O-isotope composition of the solar nebula and its evolution [1,2]. Based on the narrow range of O-isotope composition (Δ 17 O ~ −24±2‰, 2σ) of primary minerals in FUN and non-FUN CAIs, which avoided postcrystallization isotope exchange, from CR and CV chondrites, ...
متن کاملA plagioclase–olivine–spinel–magnetite inclusion from Maralinga (CK): Evidence for sequential condensation and solid–gas exchange
We report a detailed petrography, mineral chemistry, and trace element study of MaTroc, a large calcium–aluminum-rich inclusion (CAI) (5 2.5 mm) of irregular triangular shape. The inclusion has a zonal structure: The core consists of a porous plagioclase–olivine–Ca-rich pyroxene intergrowth with subordinate apatite. Its texture is meta-gabbro-like, similar to other plagioclase–olivine inclusion...
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ژورنال
عنوان ژورنال: The Journal of the Geological Society of Japan
سال: 1958
ISSN: 0016-7630,1349-9963
DOI: 10.5575/geosoc.64.264