Publication: Criterios del sentido de la inyección en diques
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1987
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Seminario de Estudos Galegos. Area de Xeoloxía e Minería ; Instituto Universitario de Xeoloxía "Isidro Parga Pondal"
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Abstract
En este trabajo se establecen una serie de criterios que permite deducir el sentido de la inyección en los diques. Estos criterios son de dos tipos: A) Criterios basados
en indicadores cinemáticos de la deformación, que se observan a meso y microescala en los contactos dique-roca de caja, y B) Criterios basados en la observación cartográfica de ciertas variaciones geométricas, texturales, composicionales y de la deformación a lo largo de la dirección de flujo dentro del dique.
A su vez, los primeros se subdividen en:
1) Estructuras de flujo magmático.
2) Estructuras miloníticas dúctiles a dúctiles-frágiles.
3) Estructuras frágiles.
La deducci6n del sentido de la intrusión en los diques tiene gran importancia, tanto para los esquemas tectónicos regionales, como para el estudio de los flujos
magmáticos
In this paper we study sorne criteria that are useful as indicators of the sense of intrusion in dikes. There are two types of criteria: A) Criteria based on kinematic indicators, which are observable on the meso and microscale, on the dike/host-rock interfaces; B) Criteria based on the cartographical observation of certain geometrical, textural, compositional, and deformational variations along the direction of intrusion of the dikes. The meso and microscale indicators might be subdivided into three main types of structures: 1) Structures of magmatic flow; 2) Ductile to ductile-brittle mylonitic structures); 3) Brittle structures. The deduction of the sense of intrusion in dikes is vety important, both for the establishment of regional tectonic schemes, and for the study of magmatic flow patterns
In this paper we study sorne criteria that are useful as indicators of the sense of intrusion in dikes. There are two types of criteria: A) Criteria based on kinematic indicators, which are observable on the meso and microscale, on the dike/host-rock interfaces; B) Criteria based on the cartographical observation of certain geometrical, textural, compositional, and deformational variations along the direction of intrusion of the dikes. The meso and microscale indicators might be subdivided into three main types of structures: 1) Structures of magmatic flow; 2) Ductile to ductile-brittle mylonitic structures); 3) Brittle structures. The deduction of the sense of intrusion in dikes is vety important, both for the establishment of regional tectonic schemes, and for the study of magmatic flow patterns