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Minerali razpok septarijskih konkrecij iz Zgornjega Štrihovca v Slovenskih goricah : diplomsko deloKralj, AndrejaSeptarije iz nahajališča pri Zgornjem Štrihovcu so bile odkrite v 50 m širokem pasu badenijskega temnosivega glinenega laporja in peščenega laporja s posameznimi prehodi v peščenjak. Drugje jih ni ... neglede na to, da je kamnina na videz podobna. To priča o dejstvu, da so ob njihovem nastanku vladali določeni pogoji, ki so bili le ozko lokalno izpolnjeni. Večinoma so rahlo sploščene in razpokane, le redke so kompaktne in brez razpok. Septarijska kamnina je dolomitna. Med terigenimi zrni smo določili mono in polikristalni kremen, plagioklaz, muskovit, kaolinit, pirit in posamezna zrna cirkona in ilmenita. Zrna niso orientirana. Biogeno komponento zastopajo številni ostanki lupinic mikrofosilov. Septarijske razpoke so radialne in koncentrične. Raztopine, ki so pritekale v razpoke so povzročile prekristalizacijo sten septarijskih razpok in kristalizacijo novih mineralov. Obdobje mineralizacije smo razdelili v tri faze. V prvi fazi je potekala prekristalizacija sten septarijskih razpok v Fe-dolomit s sestavo blizu ankerita, izločanje ferrierita in heulandita ter verjetno zgodnje generacije kalcita. V drugi fazi so kristalile kasnejše generacije kalcita in barit. V tretji fazi je kristalil kremen. Pirit, ki je sicer zelo redek v razpokah, je lahko kristalil v celotnem obdobju mineralizacije razpok. Kemijska sestava kristalov barita kaže, da so v septarije pritekale raztopine s povsem drugačno sestavo od sestave kamnine, ki sestavlja septarije. Temperatura homogenizacije primarnih tekočinskih vključkov v baritovih kristalih znaša 150-190 °C, kar kaže na njihov hidrotermalni nastanek.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [A. Kralj], feb. 2003Language - slovenianCOBISS.SI-ID - 355422
Author
Kralj, Andreja
Other authors
Mirtič, Breda
Topics
mineralogija |
septarije |
Slovenske gorice |
mineralogy |
septaria |
Slovenske gorice |
Slovenia
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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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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Mirtič, Breda | 07177 |
Source: Personal bibliographies
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