WebbIn the second studied area (Fig. 3) the protolithes of the future Berkovitsa Group are believed to be Lazovo complex (volcanites and sediments) and small granitic bodies (which contact-metamorphosed parts of Lazovo complex), both regionally metamor-phosed in greenshist to lower amphibolite facies (Ivanov et al., 1974). The contact- Webbcomposition of the sedimentary protolithes and also due to the alteration effects and supergene processes. Several min-eral varieties are inherited from the granitic rocks such as zircon and others are introduced to the rock by hydrother-mal activity like fluorite, while other mineral variety has been formed by supergene enrichment as uranium ...
P-T put metamorfnih stijena amfibolitnog facijesa iz Dinaridske ...
Webb11 juni 2024 · The geochemical data of the paragneisses suggested different sedimentary protolithes ranging from lithic arenite to arkose for psammitic gneiss and greywacke for biotite- and hornblende-gneisses. Such variation in sedimentary protolithes of paragneisses may attribute to the changing of the depositional environment from … WebbThese data confirm the magmatic origin of the protolithes and trace back their evolutional trend during consecutive stages of crystallization and alteration. Keywords: Back-scattered electron (BSE), Cathodoluminescence (CL), Metamorphism, Serbo-Macedonian Massif, Zircon, Zonality. au yee luen
(PDF) Multiple origins for mantle harzburgites: examples from the …
Webb9 dec. 2024 · The protolith formation ages are between 2.00 and 1.93 Ga. Subsequently, these protolithes underwent high-pressure metamorphism resulted from collisional orogeny, with peak metamorphism at ca. 1.88 Ga. Then, at 1.88–1.84 Ga, these rocks experienced the retrograde metamorphism and exhumed to the surface during crustal … WebbU miocenskim konglomeratima na južnim padinama Medvednice nađene su valutice amfibolita. Osam uzoraka podvrgnuto je analitičkim postupcima. Pomoću polarizacijskog mikroskopa, određen im je mineralni sastav, struktura i tekstura a metodom ICP-MS analiziran im je kvantitativni kemijski sastav. Na temelju primarne parageneze stijene su … g5 talk