Constraining the timing, kinematics and cyclicity of Mississippian-Early Pennsylvanian glaciations in the Paraná Basin, Brazil

التفاصيل البيبلوغرافية
العنوان: Constraining the timing, kinematics and cyclicity of Mississippian-Early Pennsylvanian glaciations in the Paraná Basin, Brazil
المؤلفون: Paulo Alves de Souza, Eduardo L.M. Rosa, Felipe Kipper, Nicholas D. Fedorchuk, Fernando Farias Vesely, John L. Isbell
المصدر: Sedimentary Geology. 384:29-49
بيانات النشر: Elsevier BV, 2019.
سنة النشر: 2019
مصطلحات موضوعية: 010506 paleontology, geography, geography.geographical_feature_category, Stratigraphy, Geology, Glacier, 15. Life on land, 010502 geochemistry & geophysics, 01 natural sciences, Devonian, Diamictite, Paleontology, Ice age, Deglaciation, Push moraine, Glacial period, Ice sheet, 0105 earth and related environmental sciences
الوصف: Ice-contact deposits emplaced by Late Paleozoic Ice Age (LPIA) glaciers are rarely exposed due to a low degree of preservation and their capping by thick glaciomarine deglaciation sequences. In this paper, we present new data on glacial cyclicity, relative age constraints and paleoice flow interpretations for an ice-contact succession of the lowermost Itarare Group in eastern Parana Basin (Brazil). The 80 m-thick ice-contact complex rests over the Itarare Group basal unconformity and comprises four stacked informal stratigraphic units regarded as the depositional/deformational record of three ice lobes advance/retreat cycles. Glacial cycle 1 comprises a sheet of massive diamictite resting on striated pavements carved on Devonian sandstones and topped by grooved/fluted surfaces, which indicate subglacial emplacement from a northward flowing ice lobe. The glacial cycle 2 succession was deposited in a proglacial to ice-marginal marine setting and subsequently deformed due to minor ice margin fluctuations of a westward/southwestward flowing grounded ice lobe. Glacial cycle 3 is interpreted as a thick overridden push moraine composed of grounding-line fan deposits capped by a subglacial diamictite emplaced by grounded ice advancing northwestward. A middle Visean-early Serpukhovian palynomorph assemblage was recorded in cycle two deposits, representing the oldest late Paleozoic glacial rocks in the Parana Basin. The ice-contact complex elucidates multiple waxing and waning phases of the Windhoek Ice Sheet onto the eastern margin of the Parana Basin during the Mississippian-Early Pennsylvanian, demonstrating that ice sheets of the early stages of the LPIA were also present in the Brazilian-African domain of southwestern Gondwana.
تدمد: 0037-0738
DOI: 10.1016/j.sedgeo.2019.03.001
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::d079e1d9847d54c62f42d75f628c60a6
https://doi.org/10.1016/j.sedgeo.2019.03.001
Rights: CLOSED
رقم الانضمام: edsair.doi...........d079e1d9847d54c62f42d75f628c60a6
قاعدة البيانات: OpenAIRE
الوصف
تدمد:00370738
DOI:10.1016/j.sedgeo.2019.03.001