The Contact Aureole nn Tinos (Cyclades, Greece). 1. Field Relationships, Petrography and P-T Conditions

Brocker, M. and Franz, L.. (1994) The Contact Aureole nn Tinos (Cyclades, Greece). 1. Field Relationships, Petrography and P-T Conditions. Chemie der Erde-Geochemistry, 54 (4). pp. 262-280.

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On Tinos (Cyclades, Greece), the intrusion of Miocene granitoids caused a contact metamorphic overprint of blueschist- and greenschist-facies country rocks. The width of the contact aureole ranges from about 600-2200 m. In metabasic rocks an oligoclase-/andesine-in isograd was recognized which separates a regional metamorphic albite-actinolite zone from a contact metamorphic plagioclase-hornblende zone. In pelitic rocks, a contact metamorphic biotite zone was mapped. Application of conventional mineral geothermobarometry yielded in most cases unreasonable temperature and pressure estimates which either indicate incomplete re-equilibration at the thermal peak or which result from considerable resetting during retrograde cooling. Temperatures in the aureole are estimated at about 475-degrees-C in the peripheral zones to about 660-degrees-C close to the granite contact. Pressure during the thermal overprint is estimated at about 3 kbar.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Theoretische Petrologie (De Capitani)
UniBasel Contributors:Franz, Leander
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Urban & Fischer
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:12 Apr 2021 14:03
Deposited On:12 Apr 2021 14:03

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