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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Rezumat articol ediţie STUDIA UNIVERSITATIS BABEÅž-BOLYAI În partea de jos este prezentat rezumatul articolului selectat. Pentru revenire la cuprinsul ediţiei din care face parte acest articol, se accesează linkul din titlu. Pentru vizualizarea tuturor articolelor din arhivă la care este autor/coautor unul din autorii de mai jos, se accesează linkul din numele autorului. |
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STUDIA GEOLOGIA - Ediţia nr.3 din 2003 | |||||||
Articol: |
TEXTURAL FEATURES AND MELT INCLUSION TYPES IN ANDESITES AND BASALTIC ANDESITES FROM THE EASTERN CARPATHIANS (CĂLIMANI – GURGHIU – HARGHITA MTS.), ROMANIA. Autori: IOAN PINTEA, EMILIA MOSONYI, ZOLTAN BARDOCZ. |
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Rezumat: Oscillatory or discontinuous zoned and sieved plagioclase, resorbed pyroxene and amphibole are important features of the magmatic minerals in volcanic environments. They are related mainly to magma mixing processes and can be successfully used to understand better magma dynamic history in shallow and intermediate magma chambers. Generally, the mafic melt mixes with felsic magmas before or during volcanic eruptions and the final products cover a large spectrum of petrographic types from andesitic to basaltic ones (e.g. Stimac & Pearce, 1992; Hattori, 1993; Kuritani, 2001). The external zones of the plagioclase phenocrysts show equilibrium either disequilibrium between melt and the magmatic crystals. Thus, the same content of anorthite was observed in the overgrowth zone of all size groups of plagioclase phenocrysts in equilibrium conditions. On the other hand, at disequilibrium, the border of the resorbed plagioclase consisted of several distinct crystallizing centers. The main types of the melt inclusions found both, in plagioclase and mafic minerals, are silicate melt inclusions (now glass or recrystallized glass) and globular sulphide melt inclusions as zoned and not-zoned primary cavities. Frequently, a supercritical aqueous fluid phase as vapor-rich inclusions (+/- solids) also occurs. The melt and the vapor-rich inclusions were formed as a result of interaction between phenocrysts and sulfur-undersaturated silicate magma during mixing in intermediate magma chambers at ca. 870-1200oC and 1-2 kb, and equilibrium P-T conditions, respectively. ... | |||||||
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