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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F12%3A10128654%21RIV13-GA0-11310___
rdf:type
skos:Concept n18:Vysledek
rdfs:seeAlso
http://dx.doi.org/10.1016/j.jvolgeores.2012.03.001
dcterms:description
The crestal portion of the upper-crustal Wallowa batholith, northeastern Oregon, provides an exceptional three-dimensional section through a flat batholith roof which rolls over into a steep wall at elevations of about 1600-2800 m. The roof-batholith margin is interpreted as representing the frozen-in' process zone of granodiorite magma which was arrested during its ascent, thus providing a direct view into processes that operate during construction of large, shallow-level Cordilleran-type batholiths. The batholith host rock records two principal and presumably coeval emplacement processes: ductile flow largely accommodated by rheologically weak and thus severely deformed marbles in the steep wall, and voluminous stoping of rheologically stronger, bedded siliciclastic rocks along the flat roof. Structures preserved along the roof suggest that the stoping was a multi-stage process involving emplacement of up to hundred meters long sills along bedding planes and formation of short connecting dikes cutting across bedding to produce sill-dike networks along the batholith-roof contact. Portions of the sill-dike networks and enclosed large rectangular roof blocks were then stoped into and continued to be mechanically disintegrated in the magma chamber. This inferred mechanism departs from the commonly assumed mode of stoped block formation solely by thermal shattering. In our view, host rocks in the process zone are fractured by dike propagation. It follows that such process of roof disruption and subsequent block stoping could be extremely rapid. In combination with other processes (e.g., roof uplift, ductile flow in weak lithologies), such rapid stoping could contribute to emplacement of voluminous and mostly non-sheeted Cordilleran-type batholiths at upper crustal levels. The crestal portion of the upper-crustal Wallowa batholith, northeastern Oregon, provides an exceptional three-dimensional section through a flat batholith roof which rolls over into a steep wall at elevations of about 1600-2800 m. The roof-batholith margin is interpreted as representing the frozen-in' process zone of granodiorite magma which was arrested during its ascent, thus providing a direct view into processes that operate during construction of large, shallow-level Cordilleran-type batholiths. The batholith host rock records two principal and presumably coeval emplacement processes: ductile flow largely accommodated by rheologically weak and thus severely deformed marbles in the steep wall, and voluminous stoping of rheologically stronger, bedded siliciclastic rocks along the flat roof. Structures preserved along the roof suggest that the stoping was a multi-stage process involving emplacement of up to hundred meters long sills along bedding planes and formation of short connecting dikes cutting across bedding to produce sill-dike networks along the batholith-roof contact. Portions of the sill-dike networks and enclosed large rectangular roof blocks were then stoped into and continued to be mechanically disintegrated in the magma chamber. This inferred mechanism departs from the commonly assumed mode of stoped block formation solely by thermal shattering. In our view, host rocks in the process zone are fractured by dike propagation. It follows that such process of roof disruption and subsequent block stoping could be extremely rapid. In combination with other processes (e.g., roof uplift, ductile flow in weak lithologies), such rapid stoping could contribute to emplacement of voluminous and mostly non-sheeted Cordilleran-type batholiths at upper crustal levels.
dcterms:title
Magma emplacement process zone preserved in the roof of a large Cordilleran batholith, Wallowa Mountains, northeastern Oregon Magma emplacement process zone preserved in the roof of a large Cordilleran batholith, Wallowa Mountains, northeastern Oregon
skos:prefLabel
Magma emplacement process zone preserved in the roof of a large Cordilleran batholith, Wallowa Mountains, northeastern Oregon Magma emplacement process zone preserved in the roof of a large Cordilleran batholith, Wallowa Mountains, northeastern Oregon
skos:notation
RIV/00216208:11310/12:10128654!RIV13-GA0-11310___
n18:predkladatel
n21:orjk%3A11310
n4:aktivita
n12:Z n12:I n12:P
n4:aktivity
I, P(GP205/07/P226), Z(MSM0021620855)
n4:cisloPeriodika
5
n4:dodaniDat
n6:2013
n4:domaciTvurceVysledku
n14:8387699 n14:2387689
n4:druhVysledku
n15:J
n4:duvernostUdaju
n10:S
n4:entitaPredkladatele
n20:predkladatel
n4:idSjednocenehoVysledku
147734
n4:idVysledku
RIV/00216208:11310/12:10128654
n4:jazykVysledku
n16:eng
n4:klicovaSlova
Wallowa batholith; Magmatic stoping; Process zone; Pluton roof; Granite; Emplacement
n4:klicoveSlovo
n5:Magmatic%20stoping n5:Pluton%20roof n5:Granite n5:Emplacement n5:Process%20zone n5:Wallowa%20batholith
n4:kodStatuVydavatele
NL - Nizozemsko
n4:kontrolniKodProRIV
[F08E0456E817]
n4:nazevZdroje
Journal of Volcanology and Geothermal Research
n4:obor
n22:DB
n4:pocetDomacichTvurcuVysledku
2
n4:pocetTvurcuVysledku
4
n4:projekt
n17:GP205%2F07%2FP226
n4:rokUplatneniVysledku
n6:2012
n4:svazekPeriodika
227
n4:tvurceVysledku
Johnson, Kenneth Verner, Kryštof Žák, Jiří Schwartz, Joshua J.
n4:wos
000305110800005
n4:zamer
n19:MSM0021620855
s:issn
0377-0273
s:numberOfPages
15
n8:doi
10.1016/j.jvolgeores.2012.03.001
n11:organizacniJednotka
11310