Basement configuration in the Colombian Basin from potential field data

Abstract

This study sheds light on the tectonic and magmatic evolution of the basement of the Caribbean Plate in the Colombian Basin. It is widely accepted that the Caribbean Large Igneous Province (CLIP) was created during the Late Cretaceous (Superchron C34) in the Pacific and subsequently migrated northeastward to its present position. The new data support the development of the CLIP in the Colombian Basin as a multi-stage volcanic and magmatic eruption related to a mantle plume. The top of the basement within the study area deepens to the east due to the emplacement of the Magdalena fan, but there is little other tectonic/structural deformation. Basement topography, therefore, is interpreted as being primarily related to differences in crustal affinity. By integrating potential field data, seismic interpretation, and regional data, it is possible to define six different basement units based on density, magnetic susceptibility, seismic facies, geometry, and relative emplacement timing. Recognition and modelling of basement units, including different volcanic edifices and magmatic intrusions, provide insight into the development of the Colombian Plateau and the relationship of thickened CLIP crust with the proto-Caribbean Oceanic Crust. The development of the Caribbean basement has significant implications for crustal thickness, heat flow, and thickness and distribution of unproven source rock intervals.

AAPG Datapages/Search and Discovery Article #90330©2018 AAPG Hedberg: Geology of Middle America – the Gulf of Mexico, Yucatan, Caribbean, Grenada and Tobago Basins and Their Margins “Integration of the geology of the area from the southern onshore of North America to the northern onshore of South America”, Siguenza, Guadalajara, Spain, July 2-5, 2018