Record details

    Fluid influence on mineral reactions in ultrahigh-pressure granulites: a case study in the Snieznik Mts. (West Sudetes, Poland)
Statement of responsibility
    Reiner Klemd, Michael Bröcker
    Bröcker, Michael
    Klemd, Reiner
Source title - serial
    Contributions to mineralogy and petrology
    Vol. 136, no. 4
    p. 358-373
    8 obr., 4 fot., 4 tab., 3 s.bibl.
    Zkr. název ser.: Contr. Mineral. Petrology
Subject group
    datování Sm/Nd
    datování U/Pb
    inkluze fluidní
    metamorfóza vysokotlaká
    orlicko-sněžnické krystalinikum
    podmínky P-T
Geographical name
    Česká republika
    Králický Sněžník (Hrubý Jeseník)
    Polsko - jihozápad
Abstract (in english)
   Small tectonic slices of underformed eclogites and ultrahigh-pressure granulites, occur in three tectonic units of the Snieznik Mts. (SW Poland). Ultrahigh-pressure granulite/eclogite transitions with peak metamorphic conditions between 21 and 28 kbar at 800 to 1000 °C occure only in the Zlote unit. Conventional U-Pb multigrain analyses of zircons from a mafic granulite provided 207Pb/206Pb ages between 360 to 369 Ma which are interpreted to approximate timing of original crystallisation from a melt. Diffusion kinetics and the restricted availability of a fluid phase mainly controlled the conversion from ganulite to eclogite, although some bulk-chemical differences were also recognised. The ultrahigh-pressure granulites from the Zlote unit exlusively contain H2O-rich inclusions with variable salinities which distinguished them from high-temperature (HT)-granulites world-wide.
   This is also in contrast to the fluid regime (H2O-N2-CO2) recognized in the lower-temperature eclogites (600-800 °C) from the closely associated Miedzygórze and Snieznik units. The variation in fluid composition between the lower-temperature eclogites and ultrahigh-pressure granulites on the one hand and ultrahigh-pressure granulites and HT-granulites on the other hand probably indicates contrasting P-T-t paths as result of different tecotnic environments
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    14. 2. 2008
Import date
    8. 8. 2012