Abstract
Los clastos carbonatados de la Formación del Monte Wegener proporcionan evidencias sedimentológicas, diagenéticas y paleontológicas de la destrucción y resedimentación de un registro carbonatadoo cámbrico oculto/no conocido en aguas someras de la región de Coats Land en la Antártida. Este mosaico incompleto podría jugar un papel clave en las comparaciones y correlaciones bioestratigráficas entre el registro cámbrico de las Montañas Transantárticas, el bloque Ellsworth-Whitmore y la Península Antártica del continente antártico. Además, representa un registro clave en las futuras reconstrucciones paleobiogeográficas de Gondwana meridional basadas en asociaciones de arqueociatos.
Highlights
Introduction and geological settingThe Bruce’s Scottish NationalAntarctic Expedition 1902-1904 sampled the deep sea sediments of the Weddell Sea, Antarctica
The carbonate clasts from the Mount Wegener Formation provide sedimentological, diagenetic and palaeontological evidences of the destruction and resedimentation of a hidden/unknown Cambrian carbonate shallow-water record at the Coats Land region of Antarctica. This incomplete mosaic could play a key role in comparisons and biostratigraphic correlations between the Cambrian record of the Transantarctic Mountains, Ellsworth-Whitmore block and Antarctic Peninsula at the Antarctica continent
It represents a key record in future palaeobiogeographic reconstructions of South Gondwana based on archaeocyathan assemblages
Summary
The Bruce’s Scottish NationalAntarctic Expedition 1902-1904 sampled the deep sea sediments of the Weddell Sea, Antarctica. The studies of the autochthonous archaeocyathan assemblages from the lower Cambrian Shackleton Limestone (Transantarctic Mountains, Hill, 1964a; Debrenne & Kruse, 1986, 1989), Miaolingian Nelson Limestone (Pensacola Mountains, Debrenne & Kruse, 1989; Wood et al, 1992) and Furongian Minaret Formation (Ellsworth Mountains, Debrenne et al, 1984) have been essential to infer the likely sources of the abundant and dispersed record of allochthonous archaeocyathan assemblages within Palaeozoic conglomerates as the Whiteout Conglomerates (Ellsworth Mountains, Debrenne, 1992) to Cenozoic deposits as the Polonez Cave and Cape Melville Formations (King George Island, Morycowa et al, 1982; Wrona & Zhuravlev, 1996), deep sea gravels (Weddell Sea, Gordon, 1920), and glacial tills and moraines from the Whichaway Nunataks (Hill 1965; Debrenne & Kruse, 1989), Shackleton Range (Stephenson Bastion and Du Toit Nunataks, Höfle & Buggisch, 1995) and the Transantarctic Mountains (Hill, 1964b). The Cambrian Mount Wegener Formation is forming part of the Mount Wegener Nappe (Fig. 2C), whose transport to the south and the low-grade metamorphic overprint were around 490 Ma as a result of Ross Orogeny (Buggisch et al, 1994b)
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