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Relation of MAGSAT Anomalies to the Main Tectonic Provinces of South AmericaComparison of MAGSAT scalar magnetic anomaly data to the main tectonic provinces and boundaries of South America reveals a number of geologic correlations. South America is divisible into a broad platform of Precambrian shields and cratons separated by Phanerozoic basins, grabens and aulacogens to the east, the Phanerozoic Patagonian Platform to the south, and the Mesozoic to Cenozoic Andean Fold Belt and Caribbean Mountain System to the west and north. The continental shields are mainly more magnetic then continental basins and orogenic belts. Cratons, mainly covered by younger sedimentary rocks, are generally associated with magnetic gradients. Most of the anomalies associated with the Patagonian Platform are positive and have higher amplitudes eastward away from the Andean Fold Belt. The northern Andes are coincident with positive magnetic anomalies, whereas the central and southern Andes are associated mainly with negative anomalies.
Document ID
19840017069
Acquisition Source
Legacy CDMS
Document Type
Other - Other
Authors
Lidiak, E. G.
(Pittsburgh Univ. Pittsburgh, PA, United States)
Keller, G. R.
(Texas Univ. El Paso, United States)
Yuan, D. W.
(Pittsburgh Univ. Pittsburgh, PA, United States)
Longacre, M. B.
(Purdue Univ. Lafayette, Ind., United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Texas Univ. Appl. of MAGSAT to Lithospheric Modeling in South America, Part 2
Subject Category
Geophysics
Meeting Information
Meeting: Ann. Intern. Meeting and Exposition of the Soc. of Exploration Geophysicists
Location: Dallas, TX
Country: United States
Start Date: January 1, 1982
Accession Number
84N25137
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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