IFIR 05409
INSTITUTO DE FISICA DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
Study of Claromecó basin from gravity, magnetic and geoid undulation charts
Autor/es:
RUIZ, FRANCISCO; INTROCASO, ANTONIO
Revista:
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2009
ISSN:
0895-9811
Resumen:
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In this work we analyze crustal characteristics of Claromecó intermontane basin using gravity and magnetic anomalies, and local geoid undulations. They are:
i) isostatic compensation (based on Airy hypothesis), related to stretching;
ii) old sediments filling the basin, covering more than 12 km, with a density contrast value of -100 kg m-3, resulting to be well balanced by an antiroot filled with upper mantle materials.
A crustal model is proposed justifying both observed Bouguer anomalies and local geoid undulations.
A chart of isobath contours is builded using a quadratic equation involving sediments thickness and local geoid undulation.
Magnetic basement depth ZT and Curie point depth ZB are obtained using spectral analysis on a total field magnetic anomaly chart. Results show that ZT reaches a maximum value of 12 km, whereas ZB attains a minimun value below the Claromecó basin. The basin puts aside two different depth domains of the Curie isothermal surface: at the southwestern zone of the Ventania ranges ZB is about 25 km, while northeast of these mountains ZB is about 30 km.
