2008
Late Devonian - earliest Mississippian glaciation in Gondwanaland and its biogeographic consequences
ISAACSON, P.E., E. DÍAZ-MARTÍNEZ, G.W. GRADER, J. KALVODA, O. BÁBEK et. al.Základní údaje
Originální název
Late Devonian - earliest Mississippian glaciation in Gondwanaland and its biogeographic consequences
Název česky
Late Devonian - earliest Mississippian glaciation in Gondwanaland and its biogeographic consequences
Autoři
ISAACSON, P.E. (826 Velká Británie a Severní Irsko), E. DÍAZ-MARTÍNEZ (724 Španělsko), G.W. GRADER (826 Velká Británie a Severní Irsko), J. KALVODA (203 Česká republika, garant), O. BÁBEK (203 Česká republika) a F.X. DEVUYST (56 Belgie)
Vydání
Palaeogeography, Palaeoclimatology, Palaeoecology, 2008, 0031-0182
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10500 1.5. Earth and related environmental sciences
Stát vydavatele
Polsko
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 2.405
Kód RIV
RIV/00216224:14310/08:00027937
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000260877100002
Klíčová slova česky
Devonian; Carboniferous; Glaciation; Gondwana; Eustasy; Lacunae
Klíčová slova anglicky
Devonian; Carboniferous; Glaciation; Gondwana; Eustasy; Lacunae
Štítky
Změněno: 29. 6. 2009 09:10, prof. RNDr. Jiří Kalvoda, CSc.
V originále
Late Devonian glaciation is well-documented in three Brazilian basins, and newer work has shown a wider extent for this event, reaching Bolivia, Peru, Central African Republic, Niger, and the USA. Physical evidence for this event includes glacial pavements and polymict striated, and faceted clasts as dropstones and within marine resedimented deposits. Late Devonian (Frasnian? and Famennian) onset of Gondwanaland's glaciations resulted in fundamental changes in coeval and later (Mississippian) depositional systems worldwide. Palynomorphs date the more widespread event within the Retispora lepidophyta (miospore) palynozone, which often occurs with the marine acritarch Umbellasphaeridium saharicum. This initial glaciation continued into earliest Carboniferous (Tournaisian) time. There were several consequences from the short-term glacioeustasy. In North America, central Europe and southern China there is a coeval sea-level fall that exhumed and eroded carbonate platforms, deposited siliciclastics, and generated lacunae in the Famennian record. The lowstand resulted in extensive carbonate breccias, shallow-water deposits and evaporites in western U.S.A. Lowstand clastic wedges were deposited in a regression (eastern U.S.A.) with widespread black shales. In Moravia, Famennian siliciclastic influx increased as a result of subaerial weathering in newly-emergent highs that resulted from sea-level drop. Partial sea-level drops were also manifested by ferruginous oolites, which developed in nearshore environments and were subsequently dispersed down adjacent slopes by storm resedimentation. In southern China, aggradation, siliciclastic influx, reflux-dolomitization from evaporation, and shallow-water carbonate resulted from Famennian sea-level fall. The coupling of glacial and lowstand events explains the sudden appearance of shallow-marine, as well as subaerially-affected features after the Frasnian transgression that breached the North American craton.
Česky
Late Devonian glaciation is well-documented in three Brazilian basins, and newer work has shown a wider extent for this event, reaching Bolivia, Peru, Central African Republic, Niger, and the USA. Physical evidence for this event includes glacial pavements and polymict striated, and faceted clasts as dropstones and within marine resedimented deposits. Late Devonian (Frasnian? and Famennian) onset of Gondwanaland's glaciations resulted in fundamental changes in coeval and later (Mississippian) depositional systems worldwide. Palynomorphs date the more widespread event within the Retispora lepidophyta (miospore) palynozone, which often occurs with the marine acritarch Umbellasphaeridium saharicum. This initial glaciation continued into earliest Carboniferous (Tournaisian) time. There were several consequences from the short-term glacioeustasy. In North America, central Europe and southern China there is a coeval sea-level fall that exhumed and eroded carbonate platforms, deposited siliciclastics, and generated lacunae in the Famennian record. The lowstand resulted in extensive carbonate breccias, shallow-water deposits and evaporites in western U.S.A. Lowstand clastic wedges were deposited in a regression (eastern U.S.A.) with widespread black shales. In Moravia, Famennian siliciclastic influx increased as a result of subaerial weathering in newly-emergent highs that resulted from sea-level drop. Partial sea-level drops were also manifested by ferruginous oolites, which developed in nearshore environments and were subsequently dispersed down adjacent slopes by storm resedimentation. In southern China, aggradation, siliciclastic influx, reflux-dolomitization from evaporation, and shallow-water carbonate resulted from Famennian sea-level fall. The coupling of glacial and lowstand events explains the sudden appearance of shallow-marine, as well as subaerially-affected features after the Frasnian transgression that breached the North American craton.
Návaznosti
| MSM0021622412, záměr |
|