Detailed morphology and structure of an active submarine arc caldera / R. W. Embley in Economic geology, Vol. 107 N° 8 (Décembre 2012)  

Public ISBD [article]  inEconomic geology > Vol. 107 N° 8 (Décembre 2012) . - pp. 1557-1570 Titre : Detailed morphology and structure of an active submarine arc caldera : Brothers volcano, Kermadec arc Type de document : texte imprimé Auteurs : R. W. Embley, Auteur ; Cornel E. J. de Ronde, Auteur ; S. G. Merle, Auteur Année de publication : 2013 Article en page(s) : pp. 1557-1570 Note générale : economic geology Langues : Anglais (eng) Mots-clés : Brothers caldera volcano  submarine frontal arc. morphology Résumé : A survey of the Brothers caldera volcano (Kermadec arc) with the autonomous underwater vehicle ABE has revealed new details of the morphology and structure of this submarine frontal arc caldera and the geologic setting of its hydrothermal activity. Brothers volcano has formed between major SW-NE–trending faults within the extensional field of the Havre Trough. Brothers may be unique among known submarine calderas in that it has four active hydrothermal systems, two high-temperature sulfide-depositing sites associated with faulting on the northwestern and western walls (i.e., the NW caldera and W caldera hydrothermal sites, respectively), and gas-rich sites on the summits of the constructional cones that fill most of the southern part of the caldera (i.e., the Upper and Lower cone sites). The 3.0- × 3.4-km caldera is well defined by a topographic rim encompassing ∼320° of its circumference and which lies between the bounds of two outer half-graben–shaped faults in the northwest and southeast sectors. There is not a morphologically well defined continuous ring fault (at the map resolution), although near-vertical scarps are present discontinuously at the base of sections of the wall. The width of the wall varies from DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/107/8/1557.short [article] Detailed morphology and structure of an active submarine arc caldera : Brothers volcano, Kermadec arc [texte imprimé] / R. W. Embley, Auteur ; Cornel E. J. de Ronde, Auteur ; S. G. Merle, Auteur . - 2013 . - pp. 1557-1570. economic geology Langues : Anglais (eng) in Economic geology > Vol. 107 N° 8 (Décembre 2012) . - pp. 1557-1570 Mots-clés : Brothers caldera volcano  submarine frontal arc. morphology Résumé : A survey of the Brothers caldera volcano (Kermadec arc) with the autonomous underwater vehicle ABE has revealed new details of the morphology and structure of this submarine frontal arc caldera and the geologic setting of its hydrothermal activity. Brothers volcano has formed between major SW-NE–trending faults within the extensional field of the Havre Trough. Brothers may be unique among known submarine calderas in that it has four active hydrothermal systems, two high-temperature sulfide-depositing sites associated with faulting on the northwestern and western walls (i.e., the NW caldera and W caldera hydrothermal sites, respectively), and gas-rich sites on the summits of the constructional cones that fill most of the southern part of the caldera (i.e., the Upper and Lower cone sites). The 3.0- × 3.4-km caldera is well defined by a topographic rim encompassing ∼320° of its circumference and which lies between the bounds of two outer half-graben–shaped faults in the northwest and southeast sectors. There is not a morphologically well defined continuous ring fault (at the map resolution), although near-vertical scarps are present discontinuously at the base of sections of the wall. The width of the wall varies from DEWEY : 553 ISSN : 0361-0128 En ligne : http://econgeol.geoscienceworld.org/content/107/8/1557.short

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