Počet záznamů: 1

Garnet exsolution in pyroxene from clinopyroxenites in the Moldanubian zone: constraining the early pre-convergence history of ultramafic rocks in the Variscan orogen

  1. 1.
    0330543 - GFU-E 2010 RIV GB eng J - Článek v odborném periodiku
    Faryad, S. W. - Dolejš, D. - Machek, Matěj
    Garnet exsolution in pyroxene from clinopyroxenites in the Moldanubian zone: constraining the early pre-convergence history of ultramafic rocks in the Variscan orogen.
    Journal of Metamorphic Geology. Roč. 27, č. 9 (2009), s. 655-671 ISSN 0263-4929
    Grant ostatní: GA ČR(CZ) GA205/06/0688; GA ČR(CZ) GP205/09/P135
    Výzkumný záměr: CEZ:AV0Z30120515
    Klíčová slova: Bohemian Massif * clinopyroxenite * decompression * garnet lamellae
    Kód oboru RIV: DB - Geologie a mineralogie
    Impakt faktor: 4.157, rok: 2009

    Exsolution lamellae of garnet in clinopyroxene and orthopyroxene porphyroclasts from garnet pyroxenites in the Moldanubian zone were studied to elucidate the pressure-temperature conditions of the exsolution process and to reconstruct the burial and exhumation path of ultramafic rocks in the Variscan orogen. The porphyroclasts occur in a fine-grained matrix with metamorphic fabrics, which consists of clinopyroxene and small amounts of garnet, orthopyroxene and amphibole. The clinopyroxene porphyroclasts contain garnet + orthopyroxene lamellae as well as ilmenite rods that have orientation parallel to planes of the porphyroclasts. Orthopyroxene porphyroclasts host garnet and clinopyroxene lamellae, which show the same lattice preferred orientation. In both cases, lamellar orthopyroxene, clinopyroxene and garnet were partially replaced by secondary amphibole.
    Trvalý link: http://hdl.handle.net/11104/0176312