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Značilnosti in razmere pri nastanku nekaterih rudnih in jalovinskih mineralov v oksidacijski coni mežiških rudišč : doktorska disertacija = Formation charactheristics and conditions of some ore and gangue minerals in oxidation zone of Mežica mines : Ph. d. thesisJeršek, MihaNamen raziskave je bil ugotoviti razmere pri katerih so nastali nekateri rudni in jalovinski minerali v mežiških rudiščih. Pregledanih in preiskanih je bilo več kot dva tisoč vzorcev kristalov ... jalovinskih in rudnih mineralov iz mežiških rudišč. Kristale kalcita sem razvrstil v sedem tipov in kristale wulfenita v tri osnovne tipe. Določil sem še oblike in mesta pojavljanja cerusita, anglesita, smithsonita, sadre, hemimorfita, aragonita, hidrocinkita, descloizita in fluorita. Rezultati raziskave kažejo, da so kalciti nastajali v dveh sistemih. V prvi fazi so se izločali v razpokah iz talnih pornih vod v zaprtem sistemu pri temperaturah med 50 in 200 °C. V drugi fazi je imela vse večji vpliv pronicujoča meteorska voda, ki je sistem bogatila z lahkim kisikovim izotopom. V mlajših razpokah in prelomih unionskega sistema so nastali kristali kalcita mlajših generacij, ki se od kalcitov starejših generacij ločijo tudi po kemični sestavi. Kristali kalcita,ki so nastajali v odprtem sistemu, so nastajali v temperaturnem območju od 200 °C pa vse do temperatur, ki vladajo v rudišču še danes (5 do IS °C). Iz pronicajočih meteorskih vod so nastali tudi kristali wulfenita. Analiza tekočinskih vključkov je pokazala, da so kristali wulfenita nastali pri nizkih temperaturah pod 50 °C. Vlogo pronicajočih meteorskih vodnih raztopin pri nastanku wulfenita nakazujejo tudi geomikrobiološki podatki. Dokazana je tesna povezava med morfologijo wulfenita in mestom nukleacije v rudišču. Posebno zanimiva je izotopska sestava kisika v wulfenitu, saj so vrednosti delta 18 negativne in v sorazmerno majhnem razponu od -16,726 do -18,536 promile. Prvič so na tem mestu opisani in določeni kristali fluorita, kristali dvojčki mineralov kalcita in sadre ter nekaterih drugi pojavi kristalov, ki dopolnjujejo paragenezo mineralov mežiških rudišč.Type of material - dissertation ; adult, seriousPublication and manufacture - Ljubljana : [M. Jeršek], feb. 2003Language - slovenianCOBISS.SI-ID - 279797
Author
Jeršek, Miha
Other authors
Mirtič, Breda |
Bermanec, Vladimir
Topics
mineralogija |
oksidacijska cona |
kalcit |
wulfenit |
Mežiška rudišča |
mineralogy |
oxidation zone |
calcite |
wulfenite |
Mežica mines
Library/institution |
City | Acronym | For loan | Other holdings |
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NTF, Department of Geology, Ljubljana | Ljubljana | NTFGEO |
outside loan 1 cop.
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Slovene Museum of Natural History, Ljubljana | Ljubljana | PMSLJ |
outside loan 1 cop.
|
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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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Jeršek, Miha | 18567 |
Mirtič, Breda | 07177 |
Source: Personal bibliographies
and: SICRIS
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