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Titolo:
TECTONIC CONTROL OF THE SUBDUCTING JUAN-FERNANDEZ RIDGE ON THE ANDEANMARGIN NEAR VALPARAISO, CHILE
Autore:
VONHUENE R; CORVALAN J; FLUEH ER; HINZ K; KORSTGARD J; RANERO CR; WEINREBE W; KLAESCHEN D; NAVEAS JLD; HARMS G; SPIEGLER D; BIEBOW N; LOCKER S; KRUGER D; MORALES E; VERGARA H; YANEZ G; VALENZUELA E; WALL R; TRINHAMMER P; LAURSEN J; SCHOLL D; KAY S; DOMINGUEZ S; SEGL M; BEESE D; LAMY F; BIALAS J; BIEGLING A; GERDOM M; HOJKA AM; HOPPENWORTH R; HUSEM S; KRASTEL S; KULOWSKI N; MORAWE MP; MUNOZ AED; LEFMANN AK; VIDAL NM; ZELT C; HINZ K; BLOCK M; DAMM V; FRITSCH J; NEBEN S; REICHERT C; SCHRECKENBERGER B;
Indirizzi:
CHRISTIAN ALBRECHTS UNIV KIEL,GEOMAR RES CTR,FORSCHUNGSZENTRUM MARINEGEOWISSENSCH D-24148 KIEL GERMANY BUNDESANSTALT GEOWISSENSCH & ROHSTOFFE D-30655 HANNOVER GERMANY AARHUS UNIV,INST GEOL DK-8000 AARHUS N DENMARK SERV NACL GEOL & MINERIA SANTIAGO CHILE
Titolo Testata:
Tectonics
fascicolo: 3, volume: 16, anno: 1997,
pagine: 474 - 488
SICI:
0278-7407(1997)16:3<474:TCOTSJ>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
NAZCA PLATE; SOUTH-AMERICA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
R. Vonhuene et al., "TECTONIC CONTROL OF THE SUBDUCTING JUAN-FERNANDEZ RIDGE ON THE ANDEANMARGIN NEAR VALPARAISO, CHILE", Tectonics, 16(3), 1997, pp. 474-488

Abstract

Near the latitude of Valparaiso, Chile, a fundamental change in configuration of the Benioff Zone, volcanic are activity, and the structureof the continental margin occurs opposite the subducting Juan Fernandez Ridge, Upper plate tectonics related to subduction of the ridge were studied by an international group of geoscientists in the two-degreesegment offshore Valparaiso, extending from the shelf edge seaward across the eastern end of Juan Fernandez Ridge, Near the O'Higgins groupof seamounts, the Juan Fernandez Ridge strikes northeast rather than continuing its east-west trend across the Pacific Basin. The ridge uplifts the upper plate, and sediments of the Valparaiso Basin are deformed against its southern flank, This deformation is consistent with thesouthward migration required by an oblique trending ridge and the nearly trench-normal vector of plate convergence. In the trench axis, theridge forms a basement barrier behind which sediments 2.5 km deep have ponded. The lower slope over the ridge appears eroded, whereas the margin not yet affected by ridge subduction is fronted by an accretionary prism about 25 km wide. Nazca Plate relief clearly influences tectonism of the margin where it subducts beneath thin continental crust; its relation to deeper processes segmenting the Andean Orogen appears to involve prior tectonic events.

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Documento generato il 28/09/20 alle ore 17:17:12