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- W1976011657 abstract "In this study, we report results of petrophysical properties such as bulk (low field) magnetic susceptibility, remanent magnetization, Köenigsberger ratios, density, unblocking temperature spectra, isothermal remanent magnetization acquisition, and thermomagnetic analysis from surface and borehole samples of rock units and iron ore bodies in the iron mining district of El Encino, Jalisco, southwestern Mexico. Iron mineralization consists mainly of magnetite (from 65% to 90% volume) and hematite. It is associated with granodioritic intrusions and volcanic units in a mid-late Cretaceous volcano-sedimentary sequence. The magnetite in the iron ore has generally large grain size and a multidomain behavior. Stable remanent magnetization components associated with pseudo- or single domain behaviors are also observed. Iron ore bodies and associated intrusives show large dipolar magnetic anomalies. For the iron ore bodies examined, either the induced or the remanent component is responsible for the magnetic anomaly response. Data on bulk susceptibility, remanent intensity, and direction provide important constraints for modeling the magnetometric anomalies i.e., by quantifying the relative contributions of induced and remanent magnetization components; and thus permitting a better control of the geometry of source bodies. Reportamos resultados de propiedades petrofisicas tales como: susceptibilidad magnetica (de campo bajo), magnetization remanente, coeficiente Köenigsberger, densidad, espectro de temperature de desbloqueo, adquisicion de magnetismo remanente isotermal, y analisis termomagnetico de muestras de roca superficiales y de nucleos de barreno, asi como para cuerpos de mineral en el distrito de mineral de fierro El Encino, Jalisco, sureste de Mexico. La mineralization de fierro consiste principalmente de magnetita (de 65% a 90% en volumen) y hematita. Esta se asocia a intrusiones granodioriticas y unidades volcanicas de la secuencia volcano-sedimentaria del Cretacico medio-tardio. La magnetita en la mena de fierro es generalmente de tamaño grande y estado magnetico multi-dominio. Tambien se observaron componentes de magnetizacion remanente estable, las que se asocian con estados magneticos de dominio pseudo- o sencillo. Los cuerpos de mineral de fierro y los intrusivos asociados muestran grandes anomalias magneticas dipolares. Para los cuerpos de fierro examinados, tanto la componente inducida como la remanente fueron responsables para la anomalia magnetica observada. Los datos de susceptibilidad volumetrica y direccion e intensidad del remanente constituyeron importantes condiciones initiales para el modelado de las anomalias magnetometricas i.e. al cuantificar las contribuciones relativas de las componentes de magnetizacion inducida y remanente; permitiendo asi un mejor control de la geometria de los cuerpos fuente." @default.
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- W1976011657 date "1995-04-01" @default.
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- W1976011657 title "Rock magnetism and magnetic surveys in the iron ore deposit of El Encino, Mexico" @default.
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- W1976011657 doi "https://doi.org/10.1016/0895-9811(95)00007-3" @default.
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