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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F14%3A10283108%21RIV15-MSM-11310___
rdf:type
n5:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1007/s00445-014-0873-z
dcterms:description
The Miocene Štiavnica volcano-plutonic complex, Western Carpathians, exposes two nearly coeval intra-caldera plutons, their roof (basement of a stratovolcano), and associated volcanic rocks. The complex thus provides insights into mechanisms of magma chamber growth beneath large volcanoes. As inferred from the anisotropy of magnetic susceptibility (AMS), these plutons were emplaced through significantly different processes: the diorite as a discordant stock with steep fabric and the granodiorite as a tabular, bell-jar pluton. In detail, we interpret that the latter was assembled in two stages. First, an upper %22layer%22 intruded as a thin sill along a major subhorizontal basement/cover detachment. The subhorizontal magnetic fabric and strongly oblate AMS ellipsoid in this layer record intrusive strain where the magma flow paths were subparallel to the pluton roof. Second, in the lower %22layer%22 of the pluton, magnetic foliations dip moderately to the similar to NW and similar to WNW to vertical and are associated with down-dip to subhorizontal lineations and prolate to weakly oblate shapes of the AMS ellipsoids. Such a fabric pattern is compatible with piecemeal floor subsidence, where magma flowed along multiple subsiding fault-bounded blocks. Based on this case example, we develop a conceptual model for magma flow paths and strain patterns for four main modes of floor subsidence: (1) piston (cauldron) subsidence is characterized by convergent flow and radial principal stretching above the magma chamber floor; (2) the piecemeal floor subsidence leads to steep to inclined magma flow paths in conduits along fault-bounded blocks; (3) asymmetric (trapdoor) subsidence produces first divergent flow paths near the conduit sides, changing into convergent paths in the narrower space near the kinematic hinge; and (4) symmetric cantilever (funnel) subsidencewill lead to divergent flow from a central feeder and thus circumferential principal stretching of the magma. The Miocene Štiavnica volcano-plutonic complex, Western Carpathians, exposes two nearly coeval intra-caldera plutons, their roof (basement of a stratovolcano), and associated volcanic rocks. The complex thus provides insights into mechanisms of magma chamber growth beneath large volcanoes. As inferred from the anisotropy of magnetic susceptibility (AMS), these plutons were emplaced through significantly different processes: the diorite as a discordant stock with steep fabric and the granodiorite as a tabular, bell-jar pluton. In detail, we interpret that the latter was assembled in two stages. First, an upper %22layer%22 intruded as a thin sill along a major subhorizontal basement/cover detachment. The subhorizontal magnetic fabric and strongly oblate AMS ellipsoid in this layer record intrusive strain where the magma flow paths were subparallel to the pluton roof. Second, in the lower %22layer%22 of the pluton, magnetic foliations dip moderately to the similar to NW and similar to WNW to vertical and are associated with down-dip to subhorizontal lineations and prolate to weakly oblate shapes of the AMS ellipsoids. Such a fabric pattern is compatible with piecemeal floor subsidence, where magma flowed along multiple subsiding fault-bounded blocks. Based on this case example, we develop a conceptual model for magma flow paths and strain patterns for four main modes of floor subsidence: (1) piston (cauldron) subsidence is characterized by convergent flow and radial principal stretching above the magma chamber floor; (2) the piecemeal floor subsidence leads to steep to inclined magma flow paths in conduits along fault-bounded blocks; (3) asymmetric (trapdoor) subsidence produces first divergent flow paths near the conduit sides, changing into convergent paths in the narrower space near the kinematic hinge; and (4) symmetric cantilever (funnel) subsidencewill lead to divergent flow from a central feeder and thus circumferential principal stretching of the magma.
dcterms:title
Magma flow paths and strain patterns in magma chambers growing by floor subsidence: a model based on magnetic fabric study of shallow-level plutons in the Štiavnica volcano-plutonic complex, Western Carpathians Magma flow paths and strain patterns in magma chambers growing by floor subsidence: a model based on magnetic fabric study of shallow-level plutons in the Štiavnica volcano-plutonic complex, Western Carpathians
skos:prefLabel
Magma flow paths and strain patterns in magma chambers growing by floor subsidence: a model based on magnetic fabric study of shallow-level plutons in the Štiavnica volcano-plutonic complex, Western Carpathians Magma flow paths and strain patterns in magma chambers growing by floor subsidence: a model based on magnetic fabric study of shallow-level plutons in the Štiavnica volcano-plutonic complex, Western Carpathians
skos:notation
RIV/00216208:11310/14:10283108!RIV15-MSM-11310___
n6:aktivita
n15:S n15:P n15:I
n6:aktivity
I, P(GAP210/12/1385), S
n6:cisloPeriodika
11
n6:dodaniDat
n16:2015
n6:domaciTvurceVysledku
n13:8387699 n13:7408285
n6:druhVysledku
n10:J
n6:duvernostUdaju
n18:S
n6:entitaPredkladatele
n8:predkladatel
n6:idSjednocenehoVysledku
26864
n6:idVysledku
RIV/00216208:11310/14:10283108
n6:jazykVysledku
n11:eng
n6:klicovaSlova
stratovolcano; pluton floor subsidence; magma emplacement; intrusive strain; aaldera; anisotropy of magnetic susceptibility (AMS)
n6:klicoveSlovo
n7:aaldera n7:intrusive%20strain n7:magma%20emplacement n7:pluton%20floor%20subsidence n7:stratovolcano n7:anisotropy%20of%20magnetic%20susceptibility%20%28AMS%29
n6:kodStatuVydavatele
US - Spojené státy americké
n6:kontrolniKodProRIV
[E71A47D8AE14]
n6:nazevZdroje
Bulletin of Volcanology
n6:obor
n17:DB
n6:pocetDomacichTvurcuVysledku
2
n6:pocetTvurcuVysledku
3
n6:projekt
n9:GAP210%2F12%2F1385
n6:rokUplatneniVysledku
n16:2014
n6:svazekPeriodika
76
n6:tvurceVysledku
Chadima, Martin Žák, Jiří Tomek, Filip
n6:wos
000343088400004
s:issn
0258-8900
s:numberOfPages
14
n20:doi
10.1007/s00445-014-0873-z
n19:organizacniJednotka
11310