IFIR   05409
INSTITUTO DE FISICA DE ROSARIO
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Análisis Espectral De Anomalias Magneticas Para El Cálculo De La Isoterma De Curie: Una Metodología Para Estimar El Flujo Térmico Cortical En Las Provincias De San Juan Y La Rioja, Argentina.
Autor/es:
RUIZ, FRANCISCO; GIMENEZ, MARIO E; INTROCASO, A; MARTINEZ, M. PATRICIA; ULIARTE, E.
Lugar:
Mar del Plata
Reunión:
Congreso; VII Congreso de Exploración y Desarrollo de Hidrocarburos "...Imaginando un Nuevo Siglo...".; 2008
Institución organizadora:
ASOCIACIÓN ARGENTINA DE GEOLOGOS Y GEOFÍSICOS PETROLEROS
Resumen:
ABSTRACT - Spectral analysis of magnetic anomalies to calculate Curie-temperature
isotherm: a methodology to estimate crustal heat-flow for San Juan and La Rioja provinces, Argentina
A
method to estimate the depth extent of magnetic sources was applied to the
magnetic anomalies from our terrestrial magnetic data base. The analysed region
involving the Precordillera Cuyana
and the Sierras Pampeanas of San Juan and La Rioja, including the Famatina System.
The
top (Zt) and bottom (Zb)
boundaries of the magnetized crust were calculated from power-density spectra of the total-field anomalies on
2-D ninety windows with 1.5°x1.5° size. The depths obtained
for the bottom of magnetized crust are assumed to correspond to Curie point
depths. The values thus obtained for the Precordillera range between 29 and 40
km, whereas for the Sierras Pampeanas, in the Sierra de Pie de Palo, and other
mountain chains along the Bermejo-Desaguadero lineament, such depth ranges
between 20 and 35 km.
From Curie point depths we have proposed a map
of heat flow in the studied region. The patterns of heat flow are distinct on
the Precordillera and on the Pampean region. The
Precordillera geologic province is characterized by low heat flow and deep
Curie depths, whereas the Sierras Pampeanas geologic province is characterized
by high heat flow and shallow Curie depths.
A
significant heat flow extending in Northeast-Southwest direction seems to be
directly related to Juan Fernández Ridge trace.