Late Devonian - earliest Mississippian glaciation in Gondwanaland and its biogeographic consequences

ISAACSON, P.E., E. DÍAZ-MARTÍNEZ, G.W. GRADER, J. KALVODA, O. BÁBEK and F.X. DEVUYST. Late Devonian - earliest Mississippian glaciation in Gondwanaland and its biogeographic consequences. Palaeogeography, Palaeoclimatology, Palaeoecology. 2008, vol. 268, 3-4, p. 126-142, 16 pp. ISSN 0031-0182.

Basic information

• Original name: Late Devonian - earliest Mississippian glaciation in Gondwanaland and its biogeographic consequences
• Name in Czech: Late Devonian - earliest Mississippian glaciation in Gondwanaland and its biogeographic consequences
• Authors: ISAACSON, P.E. (826 United Kingdom of Great Britain and Northern Ireland), E. DÍAZ-MARTÍNEZ (724 Spain), G.W. GRADER (826 United Kingdom of Great Britain and Northern Ireland), J. KALVODA (203 Czech Republic, guarantor), O. BÁBEK (203 Czech Republic) and F.X. DEVUYST (56 Belgium).
• Edition: Palaeogeography, Palaeoclimatology, Palaeoecology, 2008, 0031-0182.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10500 1.5. Earth and related environmental sciences
• Country of publisher: Poland
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 2.405
• RIV identification code: RIV/00216224:14310/08:00027937
• Organization unit: Faculty of Science
• UT WoS: 000260877100002
• Keywords (in Czech): Devonian; Carboniferous; Glaciation; Gondwana; Eustasy; Lacunae
• Keywords in English: Devonian; Carboniferous; Glaciation; Gondwana; Eustasy; Lacunae
• Tags: Carboniferous, Devonian, Eustasy, glaciation, Gondwana, Lacunae

Abstract

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.

Abstract (in Czech)

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.

Links

• MSM0021622412, plan (intention): Name: Interakce mezi chemickými látkami, prostředím a biologickými systémy a jejich důsledky na globální, regionální a lokální úrovni (INCHEMBIOL) (Acronym: INCHEMBIOL)

Investor: Ministry of Education, Youth and Sports of the CR, Interactions among the chemicals, environment and biological systems and their consequences on the global, regional and local scales (INCHEMBIOL)