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Título

Maar-diatreme infill features recorded in borehole imaging

Autor Bolós, Xavier ; Jurado, Maria José ; Oms, O.; Martí Molist, Joan ; Crespo, José ; Campeny, Gerard; Gómez de Soler, Bruno; Agustí, Jordi
Palabras clave Imágenes orientadas de sondeo
Testificación geofísica
Perforación wireline
Borehole imaging
Freatomagmatismo
Maar-diatreme
Geophysical logging measurements
Maar-diatrema
Wireline coring
Phreatomagmatism
Fecha de publicación 12-sep-2016
EditorSociedad Geológica de España
Citación Geotemas 16: 571-573 (2016)
ResumenOriented borehole images recorded with an ultrasonic acoustic televiewer and continuous coring recovery has allowed the characterization of different facies and volcanic processes involved in the infill of a maar-diatreme volcano type. Maar-diatremes are associated with strong explosions throughout most of their development, focused along feeder dikes and generally attributed to magma-water interaction. In the case study of Camp dels Ninots maar-diatreme (Girona, Spain) we have recognized four facies types located in the center of the maar-diatreme: volcanic ash, phreatomagmatic breccia with lithics and juveniles, vesicular pyroclasts (scoria), massive basalt or welded pyroclastic fragments. Ultrasonic televiewer images allow to characterize the different volcanic facies, since they display a different degree of reflectivity and textures. Other features such as fracturing and grain size can be directly measured on the images.
URI http://hdl.handle.net/10261/147668
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