The Vichada Impact Crater in Northwestern South America and its Potential for Economic Deposits

Details The Vichada Impact Crater in Northwestern South America and its Potential for Economic Deposits The Vichada Impact Crater in Northwestern South America and its Potential for Economic Deposits

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusm.p41a..03h&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #P41A-03

Mathematics

Logic

0920 Gravity Methods (1219), 0925 Magnetic And Electrical Methods (5109), 1219 Gravity Anomalies And Earth Structure (0920, 7205, 7240)

Scientific paper

A prominent positive free-air gravity anomaly mapped over a roughly 50-km diameter basin is consistent with a mascon centered on (4o30`N, -69o15`W) in the Vichada Department, Colombia, South America. The inferred large impact crater is nearly one third the size of the Chicxulub crater. It must have formed recently, in the last 30 m.a. because it controls the partially eroded and jungle-covered path of the Vichada River. No antipodal relationship has been detected. Thick sedimentary cover, erosional processes and dense vegetation greatly limit direct geological testing of the inferred impact basin. However, EGM-96 gravity data together with ground gravity and magnetic profiles support the interpretation of the impact crater structure. The impact extensively thinned and disrupted the Precambrian cratonic crust and may be associated with mineral and hydrocarbon deposits. A combined EM and magnetic airborne program is being developed to resolve additional crustal properties of the inferred Vichada impact basin Keywords: Impact crater, economic deposits, free-air gravity anomalies

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