Jagiellonian University Repository

Successive stages of calcitization and silicification of Cenomanian spicule-bearing turbidites based on microfacies analysis, Polish Outer Carpathians

pcg.skipToMenu

Successive stages of calcitization and silicification of Cenomanian spicule-bearing turbidites based on microfacies analysis, Polish Outer Carpathians

Show full item record

dc.contributor.author Bąk, Marta [SAP11015157] pl
dc.contributor.author Górny, Zbigniew [USOS118662] pl
dc.contributor.author Bąk, Krzysztof pl
dc.contributor.author Wolska, Anna [SAP11010835] pl
dc.contributor.author Stożek, Beata [SAP12018480] pl
dc.date.accessioned 2015-11-06T08:33:56Z
dc.date.available 2015-11-06T08:33:56Z
dc.date.issued 2015 pl
dc.identifier.issn 0208-9068 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/16548
dc.language eng pl
dc.rights Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa *
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/pl/legalcode *
dc.title Successive stages of calcitization and silicification of Cenomanian spicule-bearing turbidites based on microfacies analysis, Polish Outer Carpathians pl
dc.type JournalArticle pl
dc.description.physical 187-203 pl
dc.description.additional Bibliogr. s. 201-203; kolor. il. pl
dc.identifier.weblink http://www.asgp.pl/sites/default/files/volumes/85_1_187_203.pdf pl
dc.abstract.en Mid-Cretaceous turbidites with large proportions of sponge spicules are widely distributed in the Silesian Nappe of the Outer Carpathians, giving rise to diversified types of sediments, from spiculites to spicule-bearing siliciclastics and calcarenites. Part of this succession, Middle–Late Cenomanian in age, was transformed into cherts. A microfacies study showed that these turbidite sediments underwent several stages of calcitization and silicification, which took place during Mid-Cretaceous times in different sedimentary environments, i.e., on a northern shelf bordering the Silesian Basin and on a deep sea floor. The first diagenetic changes were related to changes to the biotic components of the turbidite layers, dominated by siliceous sponge spicules. This process, which took place in the spiculitic carbonate mud on the shelves, was related to the calcitization of sponge spicules. Calcareous clasts and calcified skeletal elements also were corroded by bacteria. After transportation down the slope, the biogenic and siliciclastic particles were deposited below the carbonate compensation depth. Taphonomic processes on the basin floor and alternating phases of carbonate and silica cementations, recrystallization and dissolution occurred in these sediments and were related to the diversification in composition of successive turbidite layers. Silicification was related to the formation of quartz precipitates as fibrous chalcedony or microcrystalline quartz, which were derived from the earlier dissolution of amorphous silica, originating mostly from siliceous sponge spicules and radiolarian skeletons. However, a source of silica from hydrothermal vents was also possible. The initial silica precipitation could have taken place in a slightly acidic environment, where calcite was simultaneously dissolved. A number of silicification stages, visible as different forms of silica precipitate inside moulds after bioclasts, occur in the particular turbidite layers. They were related to changes in various elements of the pore-water profile after descending turbidity-current flows. A very low sedimentation rate during the Middle–Late Cenomanian in the Silesian Basin may have favoured the sequence of initial calcitization and silicification stages of the turbidite sediments. pl
dc.subject.en calcitization pl
dc.subject.en silicification pl
dc.subject.en sponge spicules pl
dc.subject.en spicule-bearing turbidites pl
dc.subject.en cherts pl
dc.subject.en Cenomanian pl
dc.subject.en Outer Carpathians pl
dc.description.volume 85 pl
dc.description.number 1 pl
dc.identifier.doi 10.14241/asgp.2015.003 pl
dc.title.journal Annales Societatis Geologorum Poloniae pl
dc.language.container eng pl
dc.date.accession 2015-08-25 pl
dc.affiliation Wydział Biologii i Nauk o Ziemi : Instytut Nauk Geologicznych pl
dc.subtype Article pl
dc.rights.original OTHER; otwarte czasopismo; ostateczna wersja wydawcy; w momencie opublikowania; 0; pl
dc.identifier.project ROD UJ / P pl
.pointsMNiSW [2015 A]: 15


Files in this item

This item appears in the following Collection(s)

Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa Except where otherwise noted, this item's license is described as Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa