The Sondalo gabbro contact aureole (Campo unit, Eastern Alps): implications for mid-crustal mafic magma emplacement
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F16%3A00000196" target="_blank" >RIV/00025798:_____/16:00000196 - isvavai.cz</a>
Výsledek na webu
<a href="http://link.springer.com/article/10.1007/s00410-016-1263-7" target="_blank" >http://link.springer.com/article/10.1007/s00410-016-1263-7</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00410-016-1263-7" target="_blank" >10.1007/s00410-016-1263-7</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
The Sondalo gabbro contact aureole (Campo unit, Eastern Alps): implications for mid-crustal mafic magma emplacement
Popis výsledku v původním jazyce
Contact aureoles rimming plutonic rocks are the locus of metamorphism and deformations witnessing magma emplacement mechanisms in the crust. In this study, structural and petrological observations are combined to mineral equilibria modelling to unravel the polyphaser tectono-metamorphic history of the Permian Sondalo gabbro and its host rock, the Campo unit (Eastern Alps). The Campo unit consists of Grt–St–Ms–Bt–Pl–Qtz±Sil±And±Crd mica schists attesting of a Carboniferous prograde P–T path, reaching 6 kbar/600 °C and subsequently 5.6 kbar/650 °C. This metamorphism is coeval with the formation of a sub-vertical NE–SW trending foliation and its overprint by a sub-vertical NW–SE trending foliation. The heat brought by the Permian intrusives subsequently caused heating of the Campo unit at around 4 kbar/540°C reflected by regional static crystallization of cordierite and andalusite porphyroblasts. During the intrusion of the Sondalo gabbro, thermal peak conditions are recorded by Grt–Sil–Spl–Crd–Ilm granulitic xenoliths at 5.5 kbar/930 °C, subsequently exhumed at 4 kbar during the development of a new foliation (S3). This foliation is localized around the pluton and moderately dips away from the centre of the pluton. In the migmatitic contact aureole, Grt–Sil–Bt–Pl–Qtz–Ilm and Grt–Sil–Crd–Spl–Bt–Kfs–Ilm residual rocks bear the new foliation and document a decompression from 6 kbar/750°C to 5 kbar/725°C and from 5.2 kbar/800 °C to reach 4.8 kbar/770°C, respectively. The P–T–d paths recorded by the host rock and the xenoliths point to a two-step magma emplacement. First the Sondalo gabbro intruded the Campo unit causing heating of the host rock without deformation at 3–4 kbar. Second, the ductile flow along the pluton margins developed a new foliation during exhumation of the pluton and its immediate contact aureole from 6 to 4 kbar. Altogether, it indicates a progressive increase in mechanical coupling between the pluton and the host rock during magma emplacement.
Název v anglickém jazyce
The Sondalo gabbro contact aureole (Campo unit, Eastern Alps): implications for mid-crustal mafic magma emplacement
Popis výsledku anglicky
Contact aureoles rimming plutonic rocks are the locus of metamorphism and deformations witnessing magma emplacement mechanisms in the crust. In this study, structural and petrological observations are combined to mineral equilibria modelling to unravel the polyphaser tectono-metamorphic history of the Permian Sondalo gabbro and its host rock, the Campo unit (Eastern Alps). The Campo unit consists of Grt–St–Ms–Bt–Pl–Qtz±Sil±And±Crd mica schists attesting of a Carboniferous prograde P–T path, reaching 6 kbar/600 °C and subsequently 5.6 kbar/650 °C. This metamorphism is coeval with the formation of a sub-vertical NE–SW trending foliation and its overprint by a sub-vertical NW–SE trending foliation. The heat brought by the Permian intrusives subsequently caused heating of the Campo unit at around 4 kbar/540°C reflected by regional static crystallization of cordierite and andalusite porphyroblasts. During the intrusion of the Sondalo gabbro, thermal peak conditions are recorded by Grt–Sil–Spl–Crd–Ilm granulitic xenoliths at 5.5 kbar/930 °C, subsequently exhumed at 4 kbar during the development of a new foliation (S3). This foliation is localized around the pluton and moderately dips away from the centre of the pluton. In the migmatitic contact aureole, Grt–Sil–Bt–Pl–Qtz–Ilm and Grt–Sil–Crd–Spl–Bt–Kfs–Ilm residual rocks bear the new foliation and document a decompression from 6 kbar/750°C to 5 kbar/725°C and from 5.2 kbar/800 °C to reach 4.8 kbar/770°C, respectively. The P–T–d paths recorded by the host rock and the xenoliths point to a two-step magma emplacement. First the Sondalo gabbro intruded the Campo unit causing heating of the host rock without deformation at 3–4 kbar. Second, the ductile flow along the pluton margins developed a new foliation during exhumation of the pluton and its immediate contact aureole from 6 to 4 kbar. Altogether, it indicates a progressive increase in mechanical coupling between the pluton and the host rock during magma emplacement.
Klasifikace
Druh
J<sub>x</sub> - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
CEP obor
DB - Geologie a mineralogie
OECD FORD obor
—
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2016
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Contributions to Mineralogy and Petrology
ISSN
0010-7999
e-ISSN
—
Svazek periodika
171
Číslo periodika v rámci svazku
5
Stát vydavatele periodika
DE - Spolková republika Německo
Počet stran výsledku
21
Strana od-do
Article n. 52
Kód UT WoS článku
000377047900015
EID výsledku v databázi Scopus
—