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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10173867%21RIV14-MSM-11310___
rdf:type
n11:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1016/j.precamres.2012.11.007
dcterms:description
Mélanges have been reported from a variety of modern tectonic settings and are a hallmark of the Franciscan-type subduction-accretion complexes. In the Precambrian, however, well documented examples of melanges become extremely scarce. This paper describes in detail Neoproterozoic to early Cambrian melanges recently recognized in the Cadomian basement of the Teplá-Barrandian unit, Bohemian Massif. The melanges are of sedimentary and tectonic origin and include voluminous successions of graywackes interpreted to represent mass-transport deposits presumably along the upper slope of an accretionary wedge. The clast compositions indicate multiple episodes of mixing of terrigenous arc-derived and deep-water (?pelagic) material. Moreover, abundant bodies of (meta-)basalts, interpreted as dismembered seamounts or pillow volcanoes, were emplaced tectonically into various structural levels of this sedimentary melange by two different mechanisms. At an upper level, the irregular to elongated bodies of basalts were offscraped, only weakly strained, and incorporated in the sedimentary matrix that exhibits steep cleavage indicating horizontal pure shear shortening and oblate strain. In contrast, at a lower level, disc-shaped and closely spaced basalt bodies are ductilely sheared and reworked into a flat-lying prolate to plane-strain fabric suggesting horizontal ductile flow, presumably along the base of the accretionary wedge during flat-slab oceanic subduction. Our new U-Pb ages also reveal that the melange formation continued until the early Cambrian (<527 Ma). We conclude that these sedimentary-tectonic melanges and the inferred melange-forming processes are identical to those that operate along modern active plate margins and, in general, reveal their potential as excellent markers for establishing modern-style subduction in Precambrian settings. Mélanges have been reported from a variety of modern tectonic settings and are a hallmark of the Franciscan-type subduction-accretion complexes. In the Precambrian, however, well documented examples of melanges become extremely scarce. This paper describes in detail Neoproterozoic to early Cambrian melanges recently recognized in the Cadomian basement of the Teplá-Barrandian unit, Bohemian Massif. The melanges are of sedimentary and tectonic origin and include voluminous successions of graywackes interpreted to represent mass-transport deposits presumably along the upper slope of an accretionary wedge. The clast compositions indicate multiple episodes of mixing of terrigenous arc-derived and deep-water (?pelagic) material. Moreover, abundant bodies of (meta-)basalts, interpreted as dismembered seamounts or pillow volcanoes, were emplaced tectonically into various structural levels of this sedimentary melange by two different mechanisms. At an upper level, the irregular to elongated bodies of basalts were offscraped, only weakly strained, and incorporated in the sedimentary matrix that exhibits steep cleavage indicating horizontal pure shear shortening and oblate strain. In contrast, at a lower level, disc-shaped and closely spaced basalt bodies are ductilely sheared and reworked into a flat-lying prolate to plane-strain fabric suggesting horizontal ductile flow, presumably along the base of the accretionary wedge during flat-slab oceanic subduction. Our new U-Pb ages also reveal that the melange formation continued until the early Cambrian (<527 Ma). We conclude that these sedimentary-tectonic melanges and the inferred melange-forming processes are identical to those that operate along modern active plate margins and, in general, reveal their potential as excellent markers for establishing modern-style subduction in Precambrian settings.
dcterms:title
Neoproterozoic to early Cambrian Franciscan-type mélanges in the Teplá-Barrandian unit, Bohemian Massif: Evidence of modern-style accretionary processes along the Cadomian active margin of Gondwana? Neoproterozoic to early Cambrian Franciscan-type mélanges in the Teplá-Barrandian unit, Bohemian Massif: Evidence of modern-style accretionary processes along the Cadomian active margin of Gondwana?
skos:prefLabel
Neoproterozoic to early Cambrian Franciscan-type mélanges in the Teplá-Barrandian unit, Bohemian Massif: Evidence of modern-style accretionary processes along the Cadomian active margin of Gondwana? Neoproterozoic to early Cambrian Franciscan-type mélanges in the Teplá-Barrandian unit, Bohemian Massif: Evidence of modern-style accretionary processes along the Cadomian active margin of Gondwana?
skos:notation
RIV/00216208:11310/13:10173867!RIV14-MSM-11310___
n11:predkladatel
n19:orjk%3A11310
n3:aktivita
n7:Z n7:S n7:I
n3:aktivity
I, S, Z(MSM0021620855)
n3:cisloPeriodika
leden
n3:dodaniDat
n17:2014
n3:domaciTvurceVysledku
n4:8387699 n4:7631219 n4:4043790
n3:druhVysledku
n10:J
n3:duvernostUdaju
n8:S
n3:entitaPredkladatele
n20:predkladatel
n3:idSjednocenehoVysledku
91348
n3:idVysledku
RIV/00216208:11310/13:10173867
n3:jazykVysledku
n16:eng
n3:klicovaSlova
Teplá-Barrandian unit; ophiolite; mélange; Bohemian Massif; Cadomian orogeny; accretionary wedge
n3:klicoveSlovo
n12:Cadomian%20orogeny n12:Bohemian%20Massif n12:accretionary%20wedge n12:m%C3%A9lange n12:ophiolite n12:Tepl%C3%A1-Barrandian%20unit
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[9523E5B35BC2]
n3:nazevZdroje
Precambrian Research
n3:obor
n14:DB
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:rokUplatneniVysledku
n17:2013
n3:svazekPeriodika
224
n3:tvurceVysledku
Hajná, Jaroslava Gerdes, Axel Kachlík, Václav Žák, Jiří Dörr, Wolfgang
n3:wos
000313765800037
n3:zamer
n5:MSM0021620855
s:issn
0301-9268
s:numberOfPages
18
n21:doi
10.1016/j.precamres.2012.11.007
n18:organizacniJednotka
11310