Geologia
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ISSN 0138-0974
e-ISSN: 2353-0782
Issue Date
2009
Volume
T. 35
Number
Nr 3/1
Description
Journal Volume
Geologia
T. 35 (2009)
Projects
Pages
Articles
Mysterious high-pyrope detritic garnets in the Middle Jurassic clastics of the Cracow region
(Wydawnictwa AGH, 2009) Aubrecht, Roman; Méres, Štefan; Gradziński, Michał; Sýkora, Milan
W celu rozpoznania składu minerałów ciężkich środkowojurajskich piasków i piaskowców, analizie poddano utwory tego wieku z kilku odsłonięć okolic Krakowa (Dębnik, Dębnik-Czatkowice, Racławice, Paczółtowice). Wykazano w ich obrębie wysoki udział minerałów z grupy granatu, wskazując na duże podobieństwo do minerałów tego typu znanych z zewnętrznych Karpat Zachodnich. Tym niemniej bezpośrednie wskazanie obszaru źródłowego tych minerałów nie jest możliwe, a stwierdzić można jedynie, że ten enigmatyczny region obfitował w granulity, eklogity i perydotyty.
Wstępne wyniki badań paleobotanicznych wiercenia Studzianna (trias-jura) z północnego obrzeżenia Gór Świętokrzyskich
(Wydawnictwa AGH, 2009) Barbacka, Maria; Feldman-Olszewska, Anna; Jarzynka, Agata; Krupnik, Joanna; Ociepa, Anna Maria; Wcisło-Luraniec, Elżbieta; Ziaja, Jadwiga
Studzianna well core (Triassic-Jurassic) from the Holy Cross Mts region were investigated. Fossil plants from the genus <i>Neocalamites</i> (Equisetales) were found mainly in the Triassic sediments. Fragments of Ginkgoales and Czekanowskiales and Coniferales were determined mainly from the Lower Jurassic. The Lower Jurassic microflora consists of sporomorphs from Bryophyta, Equisetales, Lycopodiales, Filicales from the family Cyatheaceae or Dicsoniaceae, Pteridospermophyta from Caytoniales, Ginkgoales or Cycadales or Bennettitales, Coniferales from the families Taxodiaceae, Pinaceae and Cheirolepidiaceae. Palynofacies have mainly terrestrial character and confirms earlier opinion (Karaszewski 1962, Pieńkowski 2004) of the prevailed terrestrial origin of the Lower Jurassic (Hettangian-Sinemurian) sediments from the Holy Cross Mts region.
Epizody intensywnego wietrzenia chemicznego zapisane w profilach hetangu z obrzeżenia Gór Świętokrzyskich (wyniki nowych badań)
(Wydawnictwa AGH, 2009) Brański, Paweł
Results of new mineralogical and geochemical research on clay deposits of the Rhaetian-Hettangian successions from the Holy Cross Mts. margin (south-eastern part of the epicontinental Polish basin) are presented. The clay mineral assemblages were mostly controlled by climatic conditions and weathering regime. Reworking of ancient sediments and the early diagenesis could modify the clay mineral composition. Some levels of the high kaolinite content at the Triassic-Jurassic boundary suggest intense continental weathering in the humid-subtropical to tropical climate related to the global warming episodes that were recorded on isotope curves from a number of sections in the world.
Palaeogeografia Arktyki w jurze
(Wydawnictwa AGH, 2009) Golonka, Jan
Four maps illustrate geodynamic evolution and development palaeoenvironment and palaeolithofacies of the circum-Arctic region during Jurassic times. Plate tectonic process involved break-up of the supercontinent Pangea, rifting and spreading, closure on Mongol-Okhock and Anui oceans, collision of terranes with North America. Clastic sedimentation prevailed during Jurassic in the region. Important source rocks were deposited during Late Jurassic-Early Cretaceous times.
Potencjał węglowodorowy środkowojurajskich czarnych łupków sferosyderytowych (formacja łupków ze Skrzypnego) pienińskiego pasa skałkowego w Polsce
(Wydawnictwa AGH, 2009) Golonka, Jan; Matyasik, Irena; Krobicki, Michał
The organic-rich sediments were deposited during the marly stage of the proto-Pieniny basin evolution (Early Jurassic-beginning of Middle Jurassic) when this basin was relatively narrow, before the origin of Czorsztyn Ridge. After the ridge uplift sedimentation changed from anoxic to oxic, calcareous. The Rock-Eval pyrolytical analysis revealed that the Aalenian-Early Bajocian black spherosyderitic shales of the Skrzypny Shale Formation are enriched in the organic matter, but the character of kerogen and TOC content indicate the lack of good source rocks within the Middle Jurassic of the Pieniny Klippen Belt.