Publication: Los afloramientos triásicos de la zona
de confluencia de las Cordilleras
Ibérica y Bética. Aportes de la gravimetría
a su interpretación
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Publication Date
1995
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Universidad Complutense de Madrid. Departamento de Estratigrafía
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Abstract
El presente trabajo analiza el Mapa de Anomalías de Bouguer de la zona de confluencia de las Cordilleras Ibérica y Béticas, elaborado en base al procesamiento de 1.352 medidas de gravedad. Las observaciones han sido realizadas con un gravímetro astático Lacoste and Romberg. El sistema de referencia adoptado ha sido el Geodetie Reference System (GRS, 1967) para el cálculo de la gravedad teórica. Este mapa refleja una fuerte estructuración NE-SO de la zona, resaltando en ella la falla de Jumilla, accidente de posible importancia cortical que separa dos ámbitos gravimétricamente muy distintos. Algunas de las anomalías residuales calculadas por sustracción de una superficie de tercer grado pueden facilmente relacionarse con estructuras geológicas conocidas; este es el caso de mínimos gravimétricos que pueden explicarse por su relación con afloramientos diapíricos triásicos. La fracturación de la zona presenta una estrecha relación con los afloramientos de materiales triásicos y los cuerpos volcánicos existentes, lo que permite pensar en un proceso genético común a los tres elementos en nuestra opinión, este proceso puede estar relacionado con una reciente etapa de activación de la rama SO del punto triple de la Cuenca de Valencia.
The following research analyses the Bougers Anomaly Map of the joining area of the Iberian and Betie Chains made on the basis of trying 1350 gravity measurements. The gravity measurements have been carried out with astatic gravimeter Lacoste and Romberg. The computation of the gravity values has been done according to the recomendation of the Geodety Reference System (GRS, 1967). This map reveals a strong NE-SW structure of the area in which the Jumilla fault, accident of possible cortical importance separatíng two very different gravimetrie limits, stands out. Some of the residual anomalies calculated by subtracting a third degree surface can easily be related with known geologie features. Gravity lows can be explained by its relation to Triassic diapiric outcrops. The fracture of the area presents a narrow relationship to the Triassic material outcrops and the existing volcanie outcrops which allows us to suppose that a common genetic process to three elements exists. In our opinion, this process has to do witli a recent stage of activation of the SW branch from the triple point in the Valencia Basin.
The following research analyses the Bougers Anomaly Map of the joining area of the Iberian and Betie Chains made on the basis of trying 1350 gravity measurements. The gravity measurements have been carried out with astatic gravimeter Lacoste and Romberg. The computation of the gravity values has been done according to the recomendation of the Geodety Reference System (GRS, 1967). This map reveals a strong NE-SW structure of the area in which the Jumilla fault, accident of possible cortical importance separatíng two very different gravimetrie limits, stands out. Some of the residual anomalies calculated by subtracting a third degree surface can easily be related with known geologie features. Gravity lows can be explained by its relation to Triassic diapiric outcrops. The fracture of the area presents a narrow relationship to the Triassic material outcrops and the existing volcanie outcrops which allows us to suppose that a common genetic process to three elements exists. In our opinion, this process has to do witli a recent stage of activation of the SW branch from the triple point in the Valencia Basin.