| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Journal of Petrology Volume 41 Number 6 Pages 809-844 2000
© Oxford University Press 2000
Petrogenesis of Mafic to Felsic Plutonic Rock Associations: the Calc-alkaline Quérigut Complex, French Pyrenees
1DEPARTMENT OF GEOLOGY, UNIVERSITY OF MANCHESTER, MANCHESTER M13 9PL, UK
2DÉPARTEMENT DE GÉOLOGIE, UMR 6425 CNRS, UNIVERSITÉ BLAISE PASCAL, 5 RUE KESSLER, 63038 CLERMONT-FERRAND, FRANCE
3SCHOOL OF GEOLOGICAL SCIENCES, KINGSTON UNIVERSITY, PENRHYN ROAD, KINGSTON-UPON-THAMES KT1 2EE, UK
The Quérigut mafic–felsic rock association comprises two main magma series. The first is felsic comprising a granodiorite–tonalite, a monzogranite and a biotite granite. The second is intermediate to ultramafic, forming small diorite and gabbro intrusions associated with hornblendites and olivine hornblendites. A U–Pb zircon age of 307 ± 2 Ma was obtained from the granodiorite–tonalites. Contact metamorphic minerals in the thermal aureole provide a maximum emplacement pressure of between 260 and 270 MPa. Petrographic characteristics of the mafic and ultramafic rocks suggest crystallization at <300 MPa, demonstrating that mantle-derived magmas ascended to shallow levels in the Pyrenean crust during Variscan times. The ultramafic rocks are the most isotopically primitive components, with textural and geochemical features of cumulates from hydrous basaltic magmas. None of the mafic to ultramafic rocks have depleted mantle isotope signatures, indicating crustal contamination or derivation from enriched mantle. Origins for the diorites include accumulation from granodiorite–tonalite magma, derivatives from mafic magmas, or hybrids. The granitic rocks were formed from broadly Proterozoic meta-igneous crustal protoliths. The isotopic signatures, mineralogy and geochemistry of the granodiorite–tonalites and monzogranites suggest crystallization from different magmas with similar time-integrated Rb/Sr and Sm/Nd isotope ratios, or that the granodiorite–tonalites are cumulates from a granodioritic to monzogranitic parent. The biotite granite differs from the other felsic rocks, representing a separate magma batch. Ages for Quérigut and other Pyrenean granitoids show that post-collisional wrenching in this part of the Variscides was under way by 310 Ma.
KEY WORDS: Variscan orogeny; Pyrenees; Quérigut complex; epizonal magmatism; post-thickening; mafic–felsic association
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  Y. Denele, P. Barbey, E. Deloule, E. Pelleter, P. Olivier, and G. Gleizes Middle Ordovician U-Pb age of the Aston and Hospitalet orthogneissic laccoliths: their role in the Variscan evolution of the Pyrenees Bulletin de la Societe Geologique de France, May 1, 2009; 180(3): 209 - 216. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. Pietranik and T. E. Waight Processes and Sources during Late Variscan Dioritic-Tonalitic Magmatism: Insights from Plagioclase Chemistry (Gesiniec Intrusion, NE Bohemian Massif, Poland) J. Petrology, September 1, 2008; 49(9): 1619 - 1645. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Pupier, P. Barbey, M. J. Toplis, and F. Bussy Igneous Layering, Fractional Crystallization and Growth of Granitic Plutons: the Dolbel Batholith in SW Niger J. Petrology, June 1, 2008; 49(6): 1043 - 1068. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 P. Olivier, G. Gleizes, J.-L. Paquette, and C. Munoz Saez Structure and U Pb dating of the Saint-Arnac pluton and the Ansignan charnockite (Agly Massif): a cross-section from the upper to the middle crust of the Variscan Eastern Pyrenees Journal of the Geological Society, January 1, 2008; 165(1): 141 - 152. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. DurandD, P. Boulvais, D. Marquer, and M. Rossy Stable isotope transfer in open and closed system across chemically contrasted boundaries: metacarbonate-granitoid contacts in the Querigut magmatic complex (Eastern Pyrenees, France) Journal of the Geological Society, September 1, 2006; 163(5): 827 - 836. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. ASRAT, P. BARBEY, J. N. LUDDEN, L. REISBERG, G. GLEIZES, and D. AYALEW Petrology and Isotope Geochemistry of the Pan-African Negash Pluton, Northern Ethiopia: Mafic-Felsic Magma Interactions During the Construction of Shallow-level Calc-alkaline Plutons J. Petrology, June 1, 2004; 45(6): 1147 - 1179. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. J. Timmerman Timing, geodynamic setting and character of Permo-Carboniferous magmatism in the foreland of the Variscan Orogen, NW Europe Geological Society, London, Special Publications, January 1, 2004; 223(1): 41 - 74. [Abstract] [PDF]
|
|
|
|
|
|
M. Lago, E. Arranz, A. Pocovi, C. Gale, and A. Gil-Imaz Permian magmatism and basin dynamics in the southern Pyrenees: a record of the transition from late Variscan transtension to early Alpine extension Geological Society, London, Special Publications, January 1, 2004; 223(1): 439 - 464. [Abstract] [PDF]
|
|
|
|
|
|
M. Lago, E. Arranz, A. Pocovi, C. Gale, and A. Gil-Imaz Lower Permian magmatism of the Iberian Chain, Central Spain, and its relationship to extensional tectonics Geological Society, London, Special Publications, January 1, 2004; 223(1): 465 - 490. [Abstract] [PDF]
|
|
|
|
 |
|
 M. W. Schmidt and S. Poli Magmatic Epidote Reviews in Mineralogy and Geochemistry, January 1, 2004; 56(1): 399 - 430. [Full Text] [PDF]
|
|
|
|
|
|
F. COSTA, M. A. DUNGAN, and B. S. SINGER Hornblende- and Phlogopite-Bearing Gabbroic Xenoliths from Volcan San Pedro (36{degrees}S), Chilean Andes: Evidence for Melt and Fluid Migration and Reactions in Subduction-Related Plutons J. Petrology, February 1, 2002; 43(2): 219 - 241. [Abstract] [Full Text] [PDF]
|
|