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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F13%3A10173866%21RIV14-GA0-11310___
rdf:type
n14:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1002/tect.20088
dcterms:description
Field relationships combined with new U-Pb zircon geochronology suggest that the shallow-level Krkonoše-Jizera plutonic complex, northern Bohemian Massif, was assembled successively from bottom to top, starting with emplacement of the separately evolved S-type Tanvald granite (317.32.1 Ma), followed by at least two voluminous batches of the I-type porphyritic Liberec (319.52.3 Ma) and Jizera (320.13.0 Ma and 319.33.7 Ma) granites. The intrusive sequence was completed by uppermost, minor intrusions of the equigranular Harrachov (315.0 +/- 2.7 Ma) and Krkonoše granites. The I-type granites exhibit an unusually complex pattern of superposed feldspar phenocryst and magnetic fabrics as revealed from the anisotropy of magnetic susceptibility (AMS). The outer Liberec granite preserves margin-parallel foliations and lineations, interpreted to record emplacement-related strain captured by cooling from the pluton floor and walls. In contrast, the inner Jizera, Harrachov, and Krkonoše granites were overprinted by synmagmatic strain resulting from dextral movements along regional strike-slip faults cutting the opposite ends of the plutonic complex. Late-stage felsic dikes in the Liberec and Jizera granites reorient from horizontal to vertical (lineation-perpendicular) attitude in response to changing the least principal stress direction, whereas mafic schlieren do not do so, representing only randomly oriented small-scale thermal-mechanical instabilities in the phenocryst framework. In general, this case example challenges the common approach of inferring pluton-wide magma flow from interpolated foliation, lineation, and schlieren patterns. More likely, magmatic fabrics in large plutons record complex temporal succession of superposed strains resulting from diverse processes at multiple scales. Field relationships combined with new U-Pb zircon geochronology suggest that the shallow-level Krkonoše-Jizera plutonic complex, northern Bohemian Massif, was assembled successively from bottom to top, starting with emplacement of the separately evolved S-type Tanvald granite (317.32.1 Ma), followed by at least two voluminous batches of the I-type porphyritic Liberec (319.52.3 Ma) and Jizera (320.13.0 Ma and 319.33.7 Ma) granites. The intrusive sequence was completed by uppermost, minor intrusions of the equigranular Harrachov (315.0 +/- 2.7 Ma) and Krkonoše granites. The I-type granites exhibit an unusually complex pattern of superposed feldspar phenocryst and magnetic fabrics as revealed from the anisotropy of magnetic susceptibility (AMS). The outer Liberec granite preserves margin-parallel foliations and lineations, interpreted to record emplacement-related strain captured by cooling from the pluton floor and walls. In contrast, the inner Jizera, Harrachov, and Krkonoše granites were overprinted by synmagmatic strain resulting from dextral movements along regional strike-slip faults cutting the opposite ends of the plutonic complex. Late-stage felsic dikes in the Liberec and Jizera granites reorient from horizontal to vertical (lineation-perpendicular) attitude in response to changing the least principal stress direction, whereas mafic schlieren do not do so, representing only randomly oriented small-scale thermal-mechanical instabilities in the phenocryst framework. In general, this case example challenges the common approach of inferring pluton-wide magma flow from interpolated foliation, lineation, and schlieren patterns. More likely, magmatic fabrics in large plutons record complex temporal succession of superposed strains resulting from diverse processes at multiple scales.
dcterms:title
Multistage magma emplacement and progressive strain accumulation in the shallow-level Krkonoše-Jizera plutonic complex, Bohemian Massif Multistage magma emplacement and progressive strain accumulation in the shallow-level Krkonoše-Jizera plutonic complex, Bohemian Massif
skos:prefLabel
Multistage magma emplacement and progressive strain accumulation in the shallow-level Krkonoše-Jizera plutonic complex, Bohemian Massif Multistage magma emplacement and progressive strain accumulation in the shallow-level Krkonoše-Jizera plutonic complex, Bohemian Massif
skos:notation
RIV/00216208:11310/13:10173866!RIV14-GA0-11310___
n14:predkladatel
n20:orjk%3A11310
n3:aktivita
n6:Z n6:I n6:P
n3:aktivity
I, P(GA205/07/0783), P(GAP210/11/1168), Z(MSM0021620855)
n3:cisloPeriodika
5
n3:dodaniDat
n19:2014
n3:domaciTvurceVysledku
n7:8387699 n7:7631219 n7:2387689
n3:druhVysledku
n16:J
n3:duvernostUdaju
n10:S
n3:entitaPredkladatele
n5:predkladatel
n3:idSjednocenehoVysledku
90187
n3:idVysledku
RIV/00216208:11310/13:10173866
n3:jazykVysledku
n18:eng
n3:klicovaSlova
pluton; magmatic strain; laser ablation ICP-MS; granite; emplacement; anisotropy of magnetic susceptibility (AMS)
n3:klicoveSlovo
n15:emplacement n15:anisotropy%20of%20magnetic%20susceptibility%20%28AMS%29 n15:magmatic%20strain n15:laser%20ablation%20ICP-MS n15:pluton n15:granite
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[FC016D91ABFF]
n3:nazevZdroje
Tectonics
n3:obor
n17:DB
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
5
n3:projekt
n4:GA205%2F07%2F0783 n4:GAP210%2F11%2F1168
n3:rokUplatneniVysledku
n19:2013
n3:svazekPeriodika
32
n3:tvurceVysledku
Sláma, Jiří Kachlík, Václav Chlupáčová, Marta Žák, Jiří Verner, Kryštof
n3:wos
000327305800025
n3:zamer
n9:MSM0021620855
s:issn
0278-7407
s:numberOfPages
20
n11:doi
10.1002/tect.20088
n22:organizacniJednotka
11310