Microfacies of Mesozoic Carbonate

Abstract

Steklo tanko, kos apnenca, tanek snop svetlobe -~arovnija,nam pri~ara morje plitvo, plažo, ocean globine. Izvle~ekKarbonatne kamnine mezozojske starosti so v Sloveniji precej raz{irjene, saj zavzemajo kar okrog 40 % njenega ozemlja, njihova celotna skladovnica pa je debela preko 5000 metrov. V mikrofaciesu apnencev in dolomitov prepoznamo skoraj vse strukturne tipe, saj so nastajali v razli~nih sedimentacijskih okoljih, zna~ilnih za karbonatne kamnine, tako v odprtih in zati{nih delih karbonatnega {elfa, lagunah in na obrežnih ravnicah, na razli~nih vrstah grebenov, pregibih in v bazenu. Ve~krat so karbonatno sedimentacijo spremljali tudi dotoki terigenega materiala in produkti vulkanskih aktivnosti. Med diagenetskimi procesi raziskanih karbonatnih kamnin imata najve~ji obseg dolomitizacija in okremenitev.V prispevku je predstavljenih 250 mikroskopskih posnetkov zna~ilnih apnencev in dolomitov s slovenskega prostora. V uvodnem delu, v katerem so za orientacijo dodani shematski litostratigrafski stolpci, je na kratko predstavljen geolo{ki razvoj karbonatnih kamnin. Zaradi celostnega prikaza »karbonatnega obdobja« so poleg mezozojskih plasti v pregledu zajeti tudi zgornjepermski apnenci in dolomiti. AbstractCarbonate rocks of Mesozoic age are widespread in Slovenia where they consitute about 40 % of its territory, and attaining total thickness of more than 5000 metres . With respect to microfacies almost all structure types can be recognized, the limestones and dolomites being formed in various sedimentary environments, such as in open and in restricted parts of carbonate shelf, in lagoons and on coastal plains, in different types of reefs, on slopes and in the basin. Carbonate sedimentation was often accompanied also by the supply of terrigenous material and products of volcanic activity. Among diagenetic processes in investigated carbonate rocks the most extensive are dolomitization and silicification.In the present text 250 microscopic photographs of characteristic limestones and dolomites from Slovenian territory are assembled. In the introductory part, to which for orientation schematic stratigraphic columns are added, the geologic development od these carbonate rocks is briefly outlined. For the sake of completeness in presenting the »carbonate era« in the overview, Upper Permian limestones and dolomites are also described next to Mesozoic beds. Carbonate rocks are born ... (James N.P., 1979) Ob 50. obletnici izida klasifikacije karbonatnih kamnin (Folk 1962, Dunham 1962, Ham (ed.) 1962. UVODKarbonatne kamnine mezozojske starosti gradijo okrog 40 % slovenskega ozemlja (Buser & koMac, 2002). V tej, preko 5.000 metrov debeli skladovnici apnencev in dolomitov, ki jih le mestoma prekinjajo klasti~ne sedimentne kamnine, vulkaniti in piroklastiti, zasledimo skoraj vse facialne razvoje, zna~ilne tako za plitvomorska karbonatna okolja kot za globljemorska okolja. Na majhnem prostoru je razvito celotno zaporedje sedimentnih kamnin v stratigrafskem razponu od devona do kvartarja. Ta raznolikost je v precej{nji meri p...

Variety of Black and White Limestone Tesserae Used in Ancient Mosaics in Slovenia

“…This facies appears only in the mosaic of Emona . Similar facies are found on the Dinaric Carbonate Platform, where peloids, oncoids and cortoids are common features in Jurassic formations (Buser ; Ogorelec ; Gale ). The closest outcrops of Jurassic peloidal limestones are located in the southern part of the Ljubljana moor (Fig.…”

A glimpse of the lost Upper Triassic to Middle Jurassic architecture of the Dinaric Carbonate Platform margin and slope

“…Like the Upper Triassic, the outcropping Lower Jurassic successions from the northern External Dinarides show facies associations characteristic for the inner platform developments. General Lower Jurassic successions from the northern Dinarides were described by Dozet and Strohmenger (2000), Črne and Goričan (2008), Miler and Pavšič (2008), Dozet (2009), Ogorelec (2011), andKelemen (2017), among others. An unpublished thesis of Buser (1965) also provides a regional overview of Jurassic successions from southern Slovenia.…”

“…Following the Toarcian deepening, the shallow water sedimentation gradually re-established on the margin and crinoid-rich ooidal limestones that pass upwards into pure ooidal limestone were deposited (Fig. 17) (Buser, 1996;Črne & Goričan, 2008;Miler & Pavšič 2008;Buser & Dozet 2009;Ogorelec 2011;Dozet & Ogorelec 2012).…”

Evolution of the rudist bivalve Agriopleura Kühn (Radiolitidae, Hippuritida) from the Mediterranean region

“…Slovenia and Croatia, Velic et al . ; Ogorelec ). The corresponding pattern documents a stepwise spatial reduction and fragmentation of habitats, known to promote biological extinctions (Bascompte and Solé ).…”