Missing link between ultra-high pressure (UHP) and ultra-high temperature metamorphism (UHT); A case study in the Bohemian Massif

0054346 - GLÚ 2007 JP eng A - Abstract
Hirajima, T. - Nakamura, D. - Naemura, K. - Sai, H. - Svojtka, Martin
Missing link between ultra-high pressure (UHP) and ultra-high temperature metamorphism (UHT); A case study in the Bohemian Massif.
[Chybějící vazba mezi ultra-vysoce tlakovým (UHP) a ultra-vysoce teplotní metamorfózou (UHT):na příkladu Českého masivu.]
19th General Meeting of the International Mineralogical Association. Expansion to Nano, Bio, and Planetary Worlds. Kobe: International Mineralogical Association, 2006.
[General Meeting of the International Mineralogical Association. Expansion to Nano, Bio, and Planetary Worlds /19./. 23.07.2006-28.07.2006, Kobe]
R&D Projects: GA MŠMT ME 679
Institutional research plan: CEZ:AV0Z30130516
Keywords : UHP/UHT * granulite * Moldanubian Zone
Subject RIV: DB - Geology ; Mineralogy

Ultra-high pressure (UHP) and ultra-high temperature (UHT) metamorphic rocks represent the extreme metamorphism which attracts many attentions during these decades. The formation of UHP rock can be explained by the subduction of crustal materials at least to upper mantle depths and the subsequent exhumation to the surface escaping from the pervasive re-crystallization in the crust. The formation of UHT rocks needs local/regional heating up to 900-1100oC under almost H2O free conditions. Newly found Grt-peridotite lens hosted by granulite at Plešovice in the Blanský les massif recorded peak P-T conditions of 900-950oC and 30-33kbar. The peak temperature is almost identical among the granulite and the peridotite, but there is a significant pressure gap at peak conditions.
Permanent Link: http://hdl.handle.net/11104/0142465