Combined petrographic, minerochemical, fluid inclusion, and stable isotope studies have been carried out on phengite-kyanite-epidote (Phe-Ky-Ep) eclogites from Hushan and Qinglongshan (Donghai area, UHP Sulu orogen, China) to unravel their metamorphic evolution and fluid-rock interaction. A complex metamorphic evolution, from coesite-eclogite (P = 3.5-4.0 GPa and T = 840 +/- 50 degrees C) to greenschist facies conditions (P congruent to 0.2 GPa and T congruent to 350 degrees C), through quartz-eclogite and HT amphibolite-facies conditions, was recognized. The associated fluids are aqueous and show a progressive change in salinity and composition, reflecting different metamorphic stages. Stable isotope data confirm that, prior to subduction, the Sulu eclogite protolith experienced a meteoric-hydrothermal alteration, and indicate that during metamorphic evolution the rocks recrystallized without pervasive fluid infiltration
Ferrando, S., Frezzotti, M., Dallai, L., Compagnoni, R. (2005). Fluid-rock interaction in UHP phengite-kyanite-epidote eclogite from the Sulu orogen, eastern China. INTERNATIONAL GEOLOGY REVIEW, 47(7), 750-774 [10.2747/0020-6814.47.7.750].
Fluid-rock interaction in UHP phengite-kyanite-epidote eclogite from the Sulu orogen, eastern China
Frezzotti, M;
2005
Abstract
Combined petrographic, minerochemical, fluid inclusion, and stable isotope studies have been carried out on phengite-kyanite-epidote (Phe-Ky-Ep) eclogites from Hushan and Qinglongshan (Donghai area, UHP Sulu orogen, China) to unravel their metamorphic evolution and fluid-rock interaction. A complex metamorphic evolution, from coesite-eclogite (P = 3.5-4.0 GPa and T = 840 +/- 50 degrees C) to greenschist facies conditions (P congruent to 0.2 GPa and T congruent to 350 degrees C), through quartz-eclogite and HT amphibolite-facies conditions, was recognized. The associated fluids are aqueous and show a progressive change in salinity and composition, reflecting different metamorphic stages. Stable isotope data confirm that, prior to subduction, the Sulu eclogite protolith experienced a meteoric-hydrothermal alteration, and indicate that during metamorphic evolution the rocks recrystallized without pervasive fluid infiltrationFile | Dimensione | Formato | |
---|---|---|---|
Ferrando et al., 2005 IGR.pdf
Solo gestori archivio
Dimensione
510.58 kB
Formato
Adobe PDF
|
510.58 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.