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Abstract:

The Maurice Ewing Bank is located east of the Falkland/Malvinas Islands and is one of the most intriguing regions of southern Gondwana. The interaction of several microplates with major cratonic areas resulted in complex displacements between Paleozoic and Cretaceous times. Here, we present combined U-Pb and Lu-Hf zircon isotopic analyses of the Maurice Ewing Bank basement to constrain the age and tectonic setting to aid in paleogeographic reconstruction. The high-grade paragneisses in the bank present dominant Late Mesoproterozoic detrital zircon age distributions with populations at 1032 ± 12 Ma, 1068 ± 16 Ma and 1233 ± 8 Ma and juvenile signature (positive εHf[t] values). The gneisses are cutting by anatectic pink granite crystallized at 1006 ± 13 Ma which formed after syn-collisional high-grade metamorphism and shows juvenile and some crustal component (εHf[t] = +1.6 to −3). The Maurice Ewing Bank basement rocks have same Stenian age and dominant juvenile signature as the arc-related basement rocks from the Falkland/Malvinas Islands and are probably part of the same continental plateau of the South America continent. This new finding enables future reconstructions in paleogeographic models where the basement of the Falkland/Malvinas Islands and the Maurice Ewing Bank formed a single block during the Mesoproterozoic and were partly separated by crustal stretching during the opening of the Atlantic Ocean in the Late Jurassic-Cretaceous. The block played a major role in the deformation of the Cape Fold Belt from the Late Paleozoic through the Mesozoic. © 2018 Elsevier B.V.

Registro:

Documento: Artículo
Título:Age of basement rocks from the Maurice Ewing Bank and the Falkland/Malvinas Plateau
Autor:Chemale, F., Jr.; Ramos, V.A.; Naipauer, M.; Girelli, T.J.; Vargas, M.
Filiación:Programa de Pós-Graduação em Geologia, Universidade do Vale do Rio dos Sinos, São Leopoldo, RS 93.022-000, Brazil
Instituto de Estudios Andinos Don Pablo Groeber (IDEAN), CONICET, Universidad de Buenos Aires, Buenos Aires, 1428, Argentina
Palabras clave:Falkland-Malvinas Islands; Maurice Ewing Bank; Mesoproterozoic; Mesozoic; Paleogeographic reconstruction; basement rock; deformation; detrital deposit; hafnium; isotopic analysis; lutetium; Mesozoic; paleogeography; Proterozoic; tectonic reconstruction; uranium-lead dating; zircon; Atlantic Ocean; Falkland Islands (Malvinas); Stenia
Año:2018
Volumen:314
Página de inicio:28
Página de fin:40
DOI: http://dx.doi.org/10.1016/j.precamres.2018.05.026
Título revista:Precambrian Research
Título revista abreviado:Precambrian Res.
ISSN:03019268
CODEN:PCBRB
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03019268_v314_n_p28_Chemale

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Citas:

---------- APA ----------
Chemale, F., Jr., Ramos, V.A., Naipauer, M., Girelli, T.J. & Vargas, M. (2018) . Age of basement rocks from the Maurice Ewing Bank and the Falkland/Malvinas Plateau. Precambrian Research, 314, 28-40.
http://dx.doi.org/10.1016/j.precamres.2018.05.026
---------- CHICAGO ----------
Chemale, F., Jr., Ramos, V.A., Naipauer, M., Girelli, T.J., Vargas, M. "Age of basement rocks from the Maurice Ewing Bank and the Falkland/Malvinas Plateau" . Precambrian Research 314 (2018) : 28-40.
http://dx.doi.org/10.1016/j.precamres.2018.05.026
---------- MLA ----------
Chemale, F., Jr., Ramos, V.A., Naipauer, M., Girelli, T.J., Vargas, M. "Age of basement rocks from the Maurice Ewing Bank and the Falkland/Malvinas Plateau" . Precambrian Research, vol. 314, 2018, pp. 28-40.
http://dx.doi.org/10.1016/j.precamres.2018.05.026
---------- VANCOUVER ----------
Chemale, F., Jr., Ramos, V.A., Naipauer, M., Girelli, T.J., Vargas, M. Age of basement rocks from the Maurice Ewing Bank and the Falkland/Malvinas Plateau. Precambrian Res. 2018;314:28-40.
http://dx.doi.org/10.1016/j.precamres.2018.05.026