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doctoral thesis
Petrogeneza i radiometrijska starost gornjokrednog kiselog magmatizma slavonskih planina i njegov značaj u interpretaciji geodinamskih procesa Savske zone
Zagreb: University of Zagreb, Faculty of Science, 2023. urn:nbn:hr:217:169822
Schneider, Petra
University of Zagreb
Faculty of Science
Department of Geology

Institutional repository: Repository of the Faculty of Science

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Schneider, P. (2023). Petrogeneza i radiometrijska starost gornjokrednog kiselog magmatizma slavonskih planina i njegov značaj u interpretaciji geodinamskih procesa Savske zone (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:169822

Schneider, Petra. "Petrogeneza i radiometrijska starost gornjokrednog kiselog magmatizma slavonskih planina i njegov značaj u interpretaciji geodinamskih procesa Savske zone." Doctoral thesis, University of Zagreb, Faculty of Science, 2023. https://urn.nsk.hr/urn:nbn:hr:217:169822

Schneider, Petra. "Petrogeneza i radiometrijska starost gornjokrednog kiselog magmatizma slavonskih planina i njegov značaj u interpretaciji geodinamskih procesa Savske zone." Doctoral thesis, University of Zagreb, Faculty of Science, 2023. https://urn.nsk.hr/urn:nbn:hr:217:169822

Schneider, P. (2023). 'Petrogeneza i radiometrijska starost gornjokrednog kiselog magmatizma slavonskih planina i njegov značaj u interpretaciji geodinamskih procesa Savske zone', Doctoral thesis, University of Zagreb, Faculty of Science, accessed 27 March 2025, https://urn.nsk.hr/urn:nbn:hr:217:169822

Schneider P. Petrogeneza i radiometrijska starost gornjokrednog kiselog magmatizma slavonskih planina i njegov značaj u interpretaciji geodinamskih procesa Savske zone [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Science; 2023 [cited 2025 March 27] Available at: https://urn.nsk.hr/urn:nbn:hr:217:169822

P. Schneider, "Petrogeneza i radiometrijska starost gornjokrednog kiselog magmatizma slavonskih planina i njegov značaj u interpretaciji geodinamskih procesa Savske zone", Doctoral thesis, University of Zagreb, Faculty of Science, Zagreb, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:217:169822

Metadata
TitlePetrogeneza i radiometrijska starost gornjokrednog kiselog magmatizma slavonskih planina i njegov značaj u interpretaciji geodinamskih procesa Savske zone
Title (english)Petrogenesis and radiometric age of the Late Cretaceous acidic magmatic activity of the Slavonian Mts. and its significance for the interpretation of geodynamic processes in the Sava Zone
AuthorPetra Schneider
MentorDražen Balen (mentor)
Committee memberZorica Petrinec (predsjednik povjerenstva)
Committee memberNenad Tomašić (član povjerenstva)
Committee memberBruno Tomljenović (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Geology)
Zagreb
Defense date and country2023-12-19, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Geology
Universal decimal classification
(UDC)		55 - Geology. Meteorology. Hydrology
Abstract
Na području slavonskih planina (Požeške gore te Papuka) izdanjuju magmatske stijene bimodalnog geokemijskog karaktera čiji postanak i starost (ranije određena kao kasna kreda i/ili miocen) nisu još u potpunosti razjašnjeni. Primjenom optičkih mikroskopskih metoda, kvantitativnih metoda kemijske i fazne analize (ICP-MS, ICP-AES, EPMA), analizama akcesornih minerala (elementne i izotopne LA-ICP-MS analize) i njihovih uklopaka (mikro-Ramanova spektroskopija) te geotermobarometrijskim modeliranjem... More preciznije je utvrđen postanak istraživanih kiselih magmatskih stijena. Kisele stijene dominantno peraluminoznog i alkalijskog do kalcijsko-alkalijskog karaktera, nastale su iz visokotemperaturnih (750–950 °C) oksidiranih magmi A2-tipa. Starost kiselog magmatizma određena na cirkonima metodom U-Th-Pb iznosi ~82 mil. god. i označava pojavu lokalnog ekstenzijskog tektonskog režima na području Savske zone, tj. današnjih slavonskih planina. Ta je pojava vezana uz zatvaranje oceana Neotethys, uslijed kojeg su u zalučnim prostorima nastajali ekstenzijski duboki rasjedi koji su omogućavali prodor i izdizanje magme iz dubljih dijelova kontinentske kore (~30 km) te njezino smještavanje u gornjim dijelovima kore. Tim procesom nastala su intruzivna granitna tijela (na dubinama 4,5–12 km) te kisele efuzivne pojave u vidu većih masa ili manjih žila i žica. U cirkonima izdvojenima iz analiziranih granita i riolita zabilježeni su uklopci anatasa, apatita, hematita i ilmenita uz mogući magnetit, te uklopci taljevine (nanograniti) s polimorfnim modifikacijama feldspata (uključujući kokchetavit i kumdykolit), SiO2 (cristobalit i kvarc), hematit, kaolinit i muskovit. Navedeni uklopci nezavisan su mineraloški dokaz brzog izdizanja i posljedičnog naglog hlađenja primarno oksidirane taljevine iz dubljih dijelova kore u gornje dijelove. Ovo je ujedno prvi zabilježen nalaz nanogranita s kumdykolitom i kokchetavitom u magmatskom cirkonu i kao takav dokaz je kako ove mineralne faze ne nastaju isključivo u uvjetima iznimno visokih tlakova, kao što se ranije smatralo. Less
Abstract (english)
In the Slavonian Mts. area (Mt. Požeška Gora and Mt. Papuk) bimodal igneous rocks occur. Their evolution and age (previously determined as the Late Cretaceous and/or Miocene) are still unclear. The evolution of acidic rocks has been redefined using optical microscopic methods, quantitative methods of chemical and phase analyses (ICP-MS, ICP-AES, EPMA), analyses of accessory minerals (elemental and isotopic LA-ICP-MS analyses) and the inclusions they host (Micro-Raman spectroscopy), combined... More with geothermobarometric modelling. Acidic rocks are characterised as predominantly peraluminous and alkali to calcic-alkali, formed from high-temperature (750–950 °C) oxidised A2-type of magma. The age of the acidic magmatism was refined by the U-Th-Pb method on zircon and yields ~82 Ma, which marks the occurrence of a local extension in the area of the Sava Zone, i.e. in today’s Slavonian Mts. This event is associated with the closure of the Neotethys Ocean, leading to the formation of the extension-related deep faults in the back-arc setting which served as pathways for the magma ascent from the lower continental crust and emplacement in the upper crust, forming intrusive granite bodies (at 4.5–12 km depth) and effusive masses and dykes. Inclusions of anatase, apatite, hematite and ilmenite with possible magnetite, together with melt inclusions (nanogranites) containing feldspar polymorphs (including kokchetavite and kumdykolite), SiO2 (cristobalite and quartz), hematite, kaolinite and muscovite have been detected in zircon. These inclusions are the independent mineralogical evidence indicating fast cooling of a primary oxidised magma as a consequence of rapid uplift from the deep (lower) crustal level to the upper crustal level. Furthermore, this is the first report of kumdykolite- and kokchetavite-bearing melt inclusions (nanogranites) in magmatic zircon, proving that these mineral phases should not be considered exclusively as ultra-high pressure phases, as has been the case so far. Less
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:169822
Promotion2024
Study programmeTitle: DOCTORAL STUDY OF GEOLOGY
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti u području prirodnih znanosti (doktor/doktorica znanosti u području prirodnih znanosti)
Type of resourceText
ExtentXIV + 180 str. ; 30 cm
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2025-01-30 12:18:48
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