Počet záznamů: 1
Precise position of the Basal Choteč event and evolution of sedimentary environments near the Lower–Middle Devonian boundary: The magnetic susceptibility, gamma-ray spectrometric, lithological, and geochemical record of the Prague Synform (Czech Republic)
- 1.
SYSNO ASEP 0359029 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Precise position of the Basal Choteč event and evolution of sedimentary environments near the Lower–Middle Devonian boundary: The magnetic susceptibility, gamma-ray spectrometric, lithological, and geochemical record of the Prague Synform (Czech Republic) Tvůrce(i) Koptíková, Leona (GLU-S) RID, SAI Zdroj.dok. Palaeogeography, Palaeoclimatology, Palaeoecology. - : Elsevier - ISSN 0031-0182
Roč. 304, 1/2 (2011), s. 96-112Poč.str. 17 s. Forma vydání WWW - WWW Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova magnetic susceptibility ; Gamma-ray spectrometry ; Prague Synform ; Lower–Middle Devonian Vědní obor RIV DB - Geologie a mineralogie CEP KJB307020602 GA AV ČR - Akademie věd IAAX00130702 GA AV ČR - Akademie věd CEZ AV0Z30130516 - GLU-S (2005-2011) UT WOS 000290821100007 EID SCOPUS 79954950177 DOI 10.1016/j.palaeo.2010.10.011 Anotace Basal Choteč Event (close the Lower–Middle Devonian boundary, Prague Synform) has distinct correlatable magnetic susceptibility (MS), gamma spectrometric (GRS), and geochemical patterns. The MS record produces a smooth curve below the first event-related beds and a rapid increase in MS values with oscillations above. The GRS record shows a reversal in the Th to U ratio at the event base from values above 1 to below 1. REE distributions show very uniform patterns indicative of their aeolian origin. A similar trend is displayed both in the deeper- and shallow-water environments. Light and heavy mineral assemblages are dominated by dia-, paramagnetic (kaolinite, chlorite, pyroxene/amphiboles, apatite, barite, feldspars, muscovite) and ferromagnetic minerals(Fe oxides-oxyhydroxides). The MS and GRS data, together with the lithology(calcisiltic hemipelagic material below the event base and recycled skeletal detritus from turbidite currents above),suggest the sea-level rise at event interval. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2012
Počet záznamů: 1