HR: 1340h
AN: V33C-1480    [Abstracts]
TI: The use of Remote Sensing for the Study of the Relationships Between Tectonics and Volcanism
AU: Chorowicz, J
EM: jean.chorowicz@univ-pau.fr
AF: Paris 6 University, CNRS-UMR 7072: Laboratoire de Tectonique, case 129, 4 place Jussieu, Paris cedex, 75252 France
AU: * Dhont, D
EM: damien.dhont@univ-pau.fr
AF: Universite de Pau et des Pays de l'Adour, CNRS- FRE 2639: Laboratoire d'Imagerie Geophysique, CURS-IPRA, Pau, 64000 France
AU: Yanev, Y
EM: yotzo@router.geology.bas.bg
AF: Bulgarian Academy of Sciences, Geological Institute, Laboratory of Petrology and Metasomatism , Acad. G. Bonchev Str. bl. 24, Sofia, 1113 Bulgaria
AU: Bardintzeff, J
EM: bardizef@geol.u-psud.fr
AF: Universite Paris-Sud, Laboratoire de Petrographie-Volcanologie, CNRS-FRE 2566, Bat. 504, Orsay, 91405 France
AB: Observations of geometric relationships between tectonics and volcanism is a fruitful approach in geology. On the one hand analysis of the distribution and types of volcanic vents provides information on the geodynamics. On the other hand tectonic analysis explains the location of volcanics vents. Volcanic edifices often result from regional scale deformation, forming open structures constituting preferred pathways for the rise of magmas. Analysis of the shape and the distribution of vents can consequently provide data on the regional deformation. Remote sensing imagery gives synoptic views of the earth surface allowing the analysis of landforms of still active tectonic and volcanic features. Shape and distribution of volcanic vents, together with recent tectonic patterns are best observed by satellite data and Digital Elevation Models than in the field. The use of radar scenes for the study of the structural relationships between tectonic and volcanic features is particularly efficient because these data express sensitive changes in the morphology. In various selected areas, we show that volcanic edifices are located on tension fractures responsible for fissure eruptions, volcanic linear clusters and elongate volcanoes. Different types of volcanic emplacements can be also distinguished such as tail-crack or horse-tail features, and releasing bend basins along strike-slip faults. Caldera complexes seem to be associated to horse-tail type fault terminations. At a regional scale, the distribution of volcanic vents and their relationships with the faults is able to explain the occurrence of volcanism in collisional areas.
DE: 8499 General or miscellaneous
DE: 8010 Fractures and faults
DE: 8035 Pluton emplacement
DE: 8040 Remote sensing
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2004 AGU Fall Meeting