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New Evidence for Putumayo Crust in the Basement of the Falcon Basin and Guajira Peninsula, Northwestern Venezuela

By
Marvin Baquero
Marvin Baquero
PDVSA, Department of Exploration, Puerto La Cruz 6063, Anzoategui, Venezuela (e-mail: mbaquero75@gmail.com).
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Sebastian Grande
Sebastian Grande
School of Geology, Mines and Geophysics, Central University of Venezuela, Caracas 1040, Venezuela (e-mail: sgrande52@gmail.com).
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Franco Urbani
Franco Urbani
School of Geology, Mines and Geophysics, Central University of Venezuela, Caracas 1040, Venezuela and Venezuelan Foundation for Seismological Research (FUNVISIS), El Llanito 1073, Miranda, Venezuela (e-mail: urbanifranco@gmail.com).
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Umberto Cordani
Umberto Cordani
Institute of Geosciences, Geochronology Research Center, University of Sao Paulo, Rua do Lago, 562, Sao Paulo, SP 05508-080, Brazil (e-mail: ucordani@usp.br).
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Chris Hall
Chris Hall
Argon Geochronology Laboratory, Earth and Environmetal Sciences, University of Michigan, 2534 C.C. Little Bldg., 1100 North University Ave., Ann Arbor, Michigan 48109, U.S.A. (e-mail: cmhall@umich.edu).
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Richard Armstrong
Richard Armstrong
Research School of Earth Sciences, The Australian National University, Canberra 0200, Australia (e-mail: richard.armstrong@anu.edu.au).
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Published:
January 01, 2015

Abstract

U/Pb zircon and 40Ar/39Ar hornblende ages of medium- to high-grade metamorphic basement rocks from La Vela Bay in the Falcon Basin and of granitic gneiss rocks from a basement inlier in the southeastern Guajira Peninsula, northwestern Venezuela, measured by laser ablation–inductively coupled plasma–mass spectrometry and sensitive high-resolution ion microprobe, document the presence of Meso- to Neoproterozoic crust related to the Putumayo orogen, which probably correlates with the Chibcha terrane, in Colombia. Metawackes, metapelites, and granitic gneisses from these localities showed a high-grade metamorphism peak between 1.0 Ga and 0.98 Ga. Ages of inherited zircon cores of 1212 ± 11 Ma, 1214 ± 10 Ma, 1227 ± 9 Ma, 1366 ± 38 Ma, 1519 ± 9 Ma, and 2707 ± 8 Ma, are interpreted as relicts of detrital igneous grains that were originally incorporated from the Amazon craton into the sedimentary protolith. In addition, 40Ar/39Ar ages of hornblende crystals in metapelites preserve younger events between 923 Ma and 916 Ma, which indicate cooling under 530°C after the granulite facies peak. Radiometric ages presented in this study support the idea that these basement rocks probably formed part of a single orogenic belt in western South America, that formed in an active margin located in the northwestern part of the Amazon craton, which gave rise to a continental collision with Baltica during the Neoproterozoic assemblage of Rodinia.

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AAPG Memoir

Petroleum Geology and Potential of the Colombian Caribbean Margin

Claudio Bartolini
Claudio Bartolini
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Paul Mann
Paul Mann
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American Association of Petroleum Geologists
Volume
108
ISBN electronic:
9781629812724
Publication date:
January 01, 2015

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