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Titolo:
EARLY DEFORMATION OF ULTRAHELVETIC MELANGES IN THE HELVETIC NAPPES (WESTERN SWISS ALPS)
Autore:
JEANBOURQUIN P;
Indirizzi:
UNIV CALIF SANTA CRUZ,EARTH SCI BOARD SANTA CRUZ CA 95064
Titolo Testata:
Journal of structural geology
fascicolo: 10, volume: 16, anno: 1994,
pagine: 1367 - 1383
SICI:
0191-8141(1994)16:10<1367:EDOUMI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
BARBADOS ACCRETIONARY PRISM; KODIAK-ISLANDS; SHIMANTO BELT; SW JAPAN; EVOLUTION; SWITZERLAND; SEDIMENTS; VALAIS; SLOPE; MECHANISMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
79
Recensione:
Indirizzi per estratti:
Citazione:
P. Jeanbourquin, "EARLY DEFORMATION OF ULTRAHELVETIC MELANGES IN THE HELVETIC NAPPES (WESTERN SWISS ALPS)", Journal of structural geology, 16(10), 1994, pp. 1367-1383

Abstract

The Ultrahelvetic melanges represent an important clue for understanding the Tertiary Alpine orogeny, particularly in the external Alps of western Switzerland. The remarkable architecture of the Upper and Lower Ultrahelvetic units is classically explained by an important phase of gravity sliding and orogenic sliding accompanied by the formation ofchaotic complexes and olistostromes (wildflysch), a phenomenon called'diverticulation'. A structural analysis reveals evidence for early phases of deformation, despite strong overprinting by late Alpine deformation. These early fabrics are observed in foliated pebbly-mudstone (a tectonic breccia, part of the melange matrix), in disrupted flysch sequences and in dark shales. They attest to brecciation related to a complex pattern of veining, with several generations of calcite cement and several stages of failure during lithification, and they show the important role of fluids during the deformation. They present numerousanalogies with the fabrics described in association with thrusts in accretionary prisms. Considering the tectonic fabrics and the relationsamong the infra-Prealpine melanges, a tectonic model to explain the emplacement of the Ultrahelvetic units is proposed in which the decollements developed in three weak levels. The early fabrics evolved withina basal thrust formed in a final stage of the Valaisan subduction.

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Documento generato il 29/09/20 alle ore 03:30:15