Cordierite andalusite-bearing micaschist from the Garabonc-1 borehole (central Transdanubia, W. Hungary): geothermo-barometry and fluid inclusion study

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Abstract

Polymetamorphic cordierite andalusite-bearing micaschist from the Garabonc-1 borehole has been affected by three metamorphic episodes. Medium-pressure (800-900 MPa), medium-grade (500-550°C) Barrovian-type metamorphism occurred first, and was probably related to the Caledonian or Early Hercynian orogenies. The second metamorphic episode was low-pressure/medium-grade in character (200-300 MPa and 560 to 580°C). Finally, contact metamorphism (100-150 MPa and 600-640°C) was caused by an intruding granitoid body during the Carboniferous. The most dense CO2 ± CH4 ± N2 inclusions formed well after the peak P-T conditions. This inclusion type was sealed during all the three stages of metamorphism. There is no significant change in the fluid composition during the second phase. In addition to the pre-existing CO2 ± CH4 ± N2 fluid hypersaline brine was trapped in connection with the third stage. The cooling and uplift of the terrain is recorded by low- to intermediate-salinity aqueous and gaseous CH4 ± CO2 inclusions. -from Author

Original languageEnglish
Pages (from-to)1125-1136
Number of pages12
JournalEuropean Journal of Mineralogy
Volume4
Issue number5
Publication statusPublished - 1992

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Bearings (structural)
barometry
andalusite
cordierite
Boreholes
fluid inclusion
metamorphism
borehole
contact metamorphism
Fluids
fluid composition
P-T conditions
Caledonian orogeny
granitoid
brine
low pressure
uplift
cooling
salinity
fluid

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

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title = "Cordierite andalusite-bearing micaschist from the Garabonc-1 borehole (central Transdanubia, W. Hungary): geothermo-barometry and fluid inclusion study",
abstract = "Polymetamorphic cordierite andalusite-bearing micaschist from the Garabonc-1 borehole has been affected by three metamorphic episodes. Medium-pressure (800-900 MPa), medium-grade (500-550°C) Barrovian-type metamorphism occurred first, and was probably related to the Caledonian or Early Hercynian orogenies. The second metamorphic episode was low-pressure/medium-grade in character (200-300 MPa and 560 to 580°C). Finally, contact metamorphism (100-150 MPa and 600-640°C) was caused by an intruding granitoid body during the Carboniferous. The most dense CO2 ± CH4 ± N2 inclusions formed well after the peak P-T conditions. This inclusion type was sealed during all the three stages of metamorphism. There is no significant change in the fluid composition during the second phase. In addition to the pre-existing CO2 ± CH4 ± N2 fluid hypersaline brine was trapped in connection with the third stage. The cooling and uplift of the terrain is recorded by low- to intermediate-salinity aqueous and gaseous CH4 ± CO2 inclusions. -from Author",
author = "K. T{\"o}r{\"o}k",
year = "1992",
language = "English",
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N2 - Polymetamorphic cordierite andalusite-bearing micaschist from the Garabonc-1 borehole has been affected by three metamorphic episodes. Medium-pressure (800-900 MPa), medium-grade (500-550°C) Barrovian-type metamorphism occurred first, and was probably related to the Caledonian or Early Hercynian orogenies. The second metamorphic episode was low-pressure/medium-grade in character (200-300 MPa and 560 to 580°C). Finally, contact metamorphism (100-150 MPa and 600-640°C) was caused by an intruding granitoid body during the Carboniferous. The most dense CO2 ± CH4 ± N2 inclusions formed well after the peak P-T conditions. This inclusion type was sealed during all the three stages of metamorphism. There is no significant change in the fluid composition during the second phase. In addition to the pre-existing CO2 ± CH4 ± N2 fluid hypersaline brine was trapped in connection with the third stage. The cooling and uplift of the terrain is recorded by low- to intermediate-salinity aqueous and gaseous CH4 ± CO2 inclusions. -from Author

AB - Polymetamorphic cordierite andalusite-bearing micaschist from the Garabonc-1 borehole has been affected by three metamorphic episodes. Medium-pressure (800-900 MPa), medium-grade (500-550°C) Barrovian-type metamorphism occurred first, and was probably related to the Caledonian or Early Hercynian orogenies. The second metamorphic episode was low-pressure/medium-grade in character (200-300 MPa and 560 to 580°C). Finally, contact metamorphism (100-150 MPa and 600-640°C) was caused by an intruding granitoid body during the Carboniferous. The most dense CO2 ± CH4 ± N2 inclusions formed well after the peak P-T conditions. This inclusion type was sealed during all the three stages of metamorphism. There is no significant change in the fluid composition during the second phase. In addition to the pre-existing CO2 ± CH4 ± N2 fluid hypersaline brine was trapped in connection with the third stage. The cooling and uplift of the terrain is recorded by low- to intermediate-salinity aqueous and gaseous CH4 ± CO2 inclusions. -from Author

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