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Geochronology of Proterozoic basement inliers in the Colombian Andes: tectonic history of remnants of a fragmented Grenville belt

By
U. G. Cordani
U. G. Cordani
1
Institute of Geoscience, USP, Rua do Lago 562, Cidade Universitária, 05508-080 Säo Paulo, Brazil (e-mail: ucordani@usp.br)
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A. Cardona
A. Cardona
1
Institute of Geoscience, USP, Rua do Lago 562, Cidade Universitária, 05508-080 Säo Paulo, Brazil (e-mail: ucordani@usp.br)
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D. M. Jimenez
D. M. Jimenez
1
Institute of Geoscience, USP, Rua do Lago 562, Cidade Universitária, 05508-080 Säo Paulo, Brazil (e-mail: ucordani@usp.br)
2
INGEOMINAS, Diagonal 53, No. 3453, Bogota, Colombia
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D. Liu
D. Liu
3
Chinese Academy of Geological Sciences, Beijing, China
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A. P. Nutman
A. P. Nutman
4
Australian National University, Canberra, ACT 0200, Australia
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Published:
January 01, 2005

Abstract

Basement inliers of high-grade metamorphic rocks within the eastern Colombian Andes record a Grenvillian history. Among them, the Garzón Complex and the Dibulla, Bucaramanga and Jojoncito gneisses were studied using different geochronological methods to produce better correlations in the context of the reconstruction of the Grenville belt and of the supercontinent of Rodinia. The dynamic evolution of all of these units includes a final collisional event with exhumation of high-grade rocks. Such a tectonic history bears strong similarities with the Grenville Province in Canada and seems to confirm that these domains took part in the aggregation of Rodinia. Mesoproterozoic U–Pb zircon ages indicate heritage from magmatic protoliths, and the Sm-Nd model ages, as well as the εNd values, suggest derivation from an evolved continental domain, such as the Amazonian craton, with some mixing with juvenile Neoproterozoic material. When these continental fragments are correlated with similar terrains in Mexico and the Central Andes, a large crustal fragment is implied; very probably it made up the southern portion of the Grenville belt within Rodinia, which was disrupted when Laurentia separated from Gondwana forming the Iapetus Ocean, leaving behind cratonic fragments that were later accreted to the South American Platform.

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Contents

Geological Society, London, Special Publications

Terrane Processes at the Margins of Gondwana

A. P. M. Vaughan
A. P. M. Vaughan
British Antarctic Survey, UK
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P. T. Leat
P. T. Leat
British Antarctic Survey, UK
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R. J. Pankhurst
R. J. Pankhurst
British Geological Survey, UK
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Geological Society of London
Volume
246
ISBN electronic:
9781862394940
Publication date:
January 01, 2005

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