caa a22 4500 469045523 CHVBK 20180323132823.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF02536811 doi (NATIONALLICENCE)springer-10.1007/BF02536811 Microfacies and diagenesis of an upper oxfordian carbonate buildup in Mydlniki (Cracow Area, Southern Poland) [Elektronische Daten] [Jacek Matyszkiewicz, Ireneusz Felisiak] Summary: A carbonate buildup near the top of the Upper Jurassic limestone sequence in the Cracow area with a rigid framework built ofTubiphytes and thrombolites, and some fragments of encrusted siliceous sponges and serpules is described. The limestones form a dome-like elevation at the eastern wall of a 15 m high quarry flanked on both sides by stratified limestones with cherts. Six microfacies have been distinguished within the buildup: (1)Tubiphytes/thrombolite boundstone and (2) bioclasticTubiphytes/thrombolite wackestone dominate in the central and bottom part of the buildup. They gradually replace the cyanobacterial crusts and siliceous sponges (3. sponge-algal boundstone), which are sporadically the rock-forming elements in the basal part of the buildup as well as the top. Serpules randomly distributed within the buildup also form small cm-sized structures with a rigid framework (4. serpula-peloid boundstone). (5) tuberoid-peloid wackestone/floatstone and (6) ooid intraclastic grainstone exhibit no significant distributional pattern. Bioclastic-peloidal packstone comprising material derived from the destruction of the buildup occurs in the highest part of the outcrop, overlying the buildup. The sediments of the buildup were subject to rapid lithification, evidence by borings and neptunian microdykes filled with internal sediments, as well as by fracturedTubiphytes. Numerous petrographic features indicate probable episodic emergence of the buildup during its growth; these include asymmetric dissolution textures, asymmetric cements, vadose crystal silt and calcite pseudomorphs after gypsum. Upper Oxfordian carbonate buildups in the Cracow area display various stages of evolution. The carbonate buildup in Mydlniki most closely resembles classical Upper Jurassic reefs. Institut für Paläontologie, Universität Erlangen, 1992 Microfacies nationallicence Carbonate buildup nationallicence Tubiphytes reef nationallicence Diagenesis nationallicence Southern Poland nationallicence Upper Jurassic nationallicence Matyszkiewicz Jacek Institute of Metallurgy, Al. Mickiewicza 30, Pl-30-059, Cracow, Poland aut Felisiak Ireneusz Institute of Metallurgy, Al. Mickiewicza 30, Pl-30-059, Cracow, Poland aut Facies Springer-Verlag 27/1(1992-12-01), 179-189 0172-9179 27:1<179 1992 27 10347 https://doi.org/10.1007/BF02536811 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02536811 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Matyszkiewicz Jacek Institute of Metallurgy, Al. Mickiewicza 30, Pl-30-059, Cracow, Poland aut NATIONALLICENCE 700 1- Felisiak Ireneusz Institute of Metallurgy, Al. Mickiewicza 30, Pl-30-059, Cracow, Poland aut NATIONALLICENCE 773 0- Facies Springer-Verlag 27/1(1992-12-01), 179-189 0172-9179 27:1<179 1992 27 10347 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer