NTF, Department of Geology, Lj. (NTFGEO)
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Petrološke in geokemične značilnosti pohorskih magmatskih kamnin : doktoratZupančič, Nina, 1963-Najbolj razširjena pohorska magmatska kamnina je granodiorit. Proti severozahodu prehaja v perfiroidni granodiorit in ta ponekod v dacit. Nediferencirane žilnine, ki predirajo tako glavno magmatsko ... telo kot tudi okolne metamorfne kamnine, so granodiorit porfirji, temne diferenirane malhiti, svetle pa pegmatiti in apliti. Glavni kamninotvorni minerali v granodioritu so kremen, plagioklazi, K-glinenci in biotit, v malhitu plagioklazi in rogovača. Akcesorni minerali apaptit, ortit, epidot, cirkon in sfen so verjetno glavni nosilci prvih redkih zemelj. Pohorske magmatske kamnine so nastale v post-kolizijski fazi v ekstenzijskem bazenu, ki je posledica predhodne kompresije, zaradi podrivanja afriške plošče pod evropsko. Izvorna magma je nastala v globini večji od 30 km zarado taljenja amfibolita. Njegovo taljenje je posledica subdukcije, verjetno pa je del potrebne toplote prispevala tudi juvenilna magma plašča. Magma se je v magmatski komori stratificirala v bolj kislo zgornjo in bolj bazično spodnjo plast. Asimilacija okolnih kamnin in izobarno ohlajanje je povzročilo obogatitev z vodo. Zaradi razlike v gogstoti felsične magme in okolnih kamnin se je magma hitro dvignila v zgornje nivoje skorje. Med in po vtiskanju so na magmatsko telo delovali pritiski. Ko je bila kamnina dovolj strjena, je zato razpokala. Kroženje raztopin je povzročilo delno kristalizacijo kamnine in cementacijo razpok s K-glinenci, ki nadomeščajo tudi vse ostale minerale. V zadnjih fazah ohlajanja je prišlo večinoma do avtometafornih ponekod pa do hidrotermalnih sprememb.Type of material - dissertation ; adult, seriousPublication and manufacture - Ljubljana : [N. Zupančič], 1994Language - slovenianCOBISS.SI-ID - 15778309
Author
Zupančič, Nina, 1963-
Other authors
Dolenec, Tadej
Topics
geologija |
petrologija |
magmatske kamnine |
tonalit |
dacit |
Pohorje |
disertacije
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NTF, Department of Geology, Lj. |
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Geologija DD ZUPANČIČ Nina Petrološke IN: 000014624 Geologija DD ZUPANČIČ Nina Petrološke IN: 000014624 |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Zupančič, Nina, 1963- | 01384 |
Dolenec, Tadej | 06264 |
Source: Personal bibliographies
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