About This Item

Share This Item

The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 52 (1968)

Issue: 11. (November)

First Page: 2197

Last Page: 2207

Title: Diapiric Intrusions in Foreset Slope Sediments Off Magdalena Delta, Colombia

Author(s): Francis P. Shepard (2), Robert F. Dill (3), Bruce C. Heezen (4)


The Magdalena River of Colombia is prograding its delta rapidly onto the slope that leads north into Colombian basin of the Caribbean. Results of this encroachment are intermittent slope failures that break the jetties at the river mouth and sever the cables on the sea floor outside. Another possible result of the delta encroachment was indicated from the work of a Scripps Institution expedition which led to the discovery of steep-sided domes rising as much as 200 m above the sea floor in water depths of 900-1,200 m. Subbottom profiling showed that these domes, about 1 km wide, have intrusive relations to the foreset beds and can be traced down to at least 700 m below the bottom. The profiles indicate that the domes generally are flanked with ring depressions, which are u derlain by downbent strata, in contrast to the usual upbending of strata flanking salt domes. One explanation for these diapirs is that they are giant mudlumps somewhat akin to those off the passes of the Mississippi. Alternatively, they may be mud volcanoes such as are found on the adjacent lands.

Pay-Per-View Purchase Options

The article is available through a document delivery service. Explain these Purchase Options.

Protected Document: $10
Internal PDF Document: $14
Open PDF Document: $24

AAPG Member?

Please login with your Member username and password.

Members of AAPG receive access to the full AAPG Bulletin Archives as part of their membership. For more information, contact the AAPG Membership Department at [email protected].