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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10173784%21RIV14-MSM-11310___
rdf:type
skos:Concept n15:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1007/s00531-012-0811-2
dcterms:description
This paper describes late Cambrian dikes and Early Ordovician volcano-sedimentary successions of the Prague Basin, Bohemian Massif, to discuss the timing and kinematics of breakup of the northern margin of Gondwana. Andesitic dikes indicate minor E-W crustal extension in the late Cambrian, whereas the Tremadocian to Dapingian lithofacies distribution and linear array of depocenters suggest opening of this Rheic Ocean rift-related basin during NW-SE pure shear-dominated extension. This kinematic change was associated with the onset of basic submarine volcanism, presumably resulting from decompression mantle melting as the amount of extension increased. We conclude from these inferences and from a comparison with other Avalonian-Cadomian terranes that the rifting along the northern Gondwana margin was a two-stage process involving one major pulse of terrane detachment in the early Cambrian and one in the Early Ordovician. While the geodynamic cause for the former phase remains unclear, but still may include effects of Cadomian subduction (roll-back, slab break-off), isostatic rebound, or mantle plume, the incipient stage of the latter phase may have been triggered by the onset of subduction of the Iapetus Ocean at around 510 Ma, followed by advanced extension broadly coeval (Tremadocian to Darriwilian) in large portions of the Avalonian-Cadomian belt. Unequal amounts of extension resulted in the separation and drift of some terranes, while other portions of the belt remained adjacent to Gondwana. This paper describes late Cambrian dikes and Early Ordovician volcano-sedimentary successions of the Prague Basin, Bohemian Massif, to discuss the timing and kinematics of breakup of the northern margin of Gondwana. Andesitic dikes indicate minor E-W crustal extension in the late Cambrian, whereas the Tremadocian to Dapingian lithofacies distribution and linear array of depocenters suggest opening of this Rheic Ocean rift-related basin during NW-SE pure shear-dominated extension. This kinematic change was associated with the onset of basic submarine volcanism, presumably resulting from decompression mantle melting as the amount of extension increased. We conclude from these inferences and from a comparison with other Avalonian-Cadomian terranes that the rifting along the northern Gondwana margin was a two-stage process involving one major pulse of terrane detachment in the early Cambrian and one in the Early Ordovician. While the geodynamic cause for the former phase remains unclear, but still may include effects of Cadomian subduction (roll-back, slab break-off), isostatic rebound, or mantle plume, the incipient stage of the latter phase may have been triggered by the onset of subduction of the Iapetus Ocean at around 510 Ma, followed by advanced extension broadly coeval (Tremadocian to Darriwilian) in large portions of the Avalonian-Cadomian belt. Unequal amounts of extension resulted in the separation and drift of some terranes, while other portions of the belt remained adjacent to Gondwana.
dcterms:title
Timing, styles, and kinematics of Cambro-Ordovician extension in the Teplá-Barrandian Unit, Bohemian Massif, and its bearing on the opening of the Rheic Ocean Timing, styles, and kinematics of Cambro-Ordovician extension in the Teplá-Barrandian Unit, Bohemian Massif, and its bearing on the opening of the Rheic Ocean
skos:prefLabel
Timing, styles, and kinematics of Cambro-Ordovician extension in the Teplá-Barrandian Unit, Bohemian Massif, and its bearing on the opening of the Rheic Ocean Timing, styles, and kinematics of Cambro-Ordovician extension in the Teplá-Barrandian Unit, Bohemian Massif, and its bearing on the opening of the Rheic Ocean
skos:notation
RIV/00216208:11310/13:10173784!RIV14-MSM-11310___
n15:predkladatel
n16:orjk%3A11310
n3:aktivita
n4:I n4:Z n4:S
n3:aktivity
I, S, Z(MSM0021620855)
n3:cisloPeriodika
2
n3:dodaniDat
n14:2014
n3:domaciTvurceVysledku
n7:9687939 n7:4043790 n7:8387699
n3:druhVysledku
n6:J
n3:duvernostUdaju
n12:S
n3:entitaPredkladatele
n19:predkladatel
n3:idSjednocenehoVysledku
111132
n3:idVysledku
RIV/00216208:11310/13:10173784
n3:jazykVysledku
n20:eng
n3:klicovaSlova
Teplá-Barrandian Unit; rifting; Rheic Ocean; extension; Bohemian Massif; anisotropy of magnetic susceptibility (AMS)
n3:klicoveSlovo
n9:Bohemian%20Massif n9:rifting n9:extension n9:Tepl%C3%A1-Barrandian%20Unit n9:anisotropy%20of%20magnetic%20susceptibility%20%28AMS%29 n9:Rheic%20Ocean
n3:kodStatuVydavatele
DE - Spolková republika Německo
n3:kontrolniKodProRIV
[D5B4AACBD6F5]
n3:nazevZdroje
International Journal of Earth Sciences
n3:obor
n17:DB
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n14:2013
n3:svazekPeriodika
102
n3:tvurceVysledku
Žák, Jiří Hajná, Jaroslava Kraft, Petr
n3:wos
000314899300003
n3:zamer
n13:MSM0021620855
s:issn
1437-3254
s:numberOfPages
19
n18:doi
10.1007/s00531-012-0811-2
n11:organizacniJednotka
11310