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Book Chapter

Jurassic Silicic Volcanism and Associated Continental-arc Basin in Northwestern Colombia (Southern Boundary of the Caribbean Plate)

By
Carlos A. Zuluaga
Carlos A. Zuluaga
Geosciences Department, Carrera 30 No. 45-03, Edificio 224, Universidad Nacional de Colombia, Bogotá, Colombia (e-mails: cazuluagacas@unal.edu.co, alejop976@gmail.com)
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Alejandro Pinilla
Alejandro Pinilla
Geosciences Department, Carrera 30 No. 45-03, Edificio 224, Universidad Nacional de Colombia, Bogotá, Colombia (e-mails: cazuluagacas@unal.edu.co, alejop976@gmail.com)
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Paul Mann
Paul Mann
Dept of Earth and Atmospheric Sciences, 312 SR1 Bldg., Rm. 427, University of Houston, Houston, Texas 77204, U.S.A. (e-mail: pmann277@gmail.com)
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Published:
January 01, 2015

Abstract

New petrological observations from a volcanic unit at the base of the Jurassic sequence in the Alta Guajira region (Colombia) are consistent with the presence of a continental volcanic arc and the development of an intra-arc basin in the area. Fault-bounded Jurassic sedimentary basins in the Alta Guajira region were initiated during the early Jurassic (180 Ma) with silicic volcanism in the axis of a magmatic arc and later filled with a thick volcano-sedimentary sequence. The Jurassic silicic volcanic rocks at the base of the basin (Riodacita de Ipapure–Cerro La Teta) are observed as isolated remnants of andesite, dacite, and rhyolite. These lithologies are characterized geochemically by a calc-alkaline character, enrichment in light rare earth elements, Nb-Ta depletion, and Eu negative anomaly indicating a converging tectonic-setting origin, possibly in a continental volcanic arc related to early subduction. The unit marks the beginning of a continental-arc basin that was a sediment depocenter since the middle Jurassic in the area.

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Contents

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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