Skip to Main Content
GEOREF RECORD

Ultra-high-pressure metamorphism in felsic rocks; the garnet-phengite gneisses and quartzites from Lanterman Range, Antarctica

Rosaria Palmeri, Barbara Ghiribelli and Carlo Alberto Ricci
Ultra-high-pressure metamorphism in felsic rocks; the garnet-phengite gneisses and quartzites from Lanterman Range, Antarctica
European Journal of Mineralogy (June 2003) 15 (3): 513-525

Abstract

Mesostructural and microstructural relations between eclogitic boudins and country gneisses in the Ross Orogen of the Lanterman Range (Northern Victoria Land, Antarctica) are in some areas characterized by interlayering with sharp contacts on a cm scale, which indicate that the two rock-types underwent a common metamorphic evolution. Contrary to many other UHP felsic rocks that only preserve a poor record of the HP stage, the studied rocks have recorded a metamorphic history ranging from initial prograde amphibolite facies through the eclogite facies to the retrogressive amphibolite facies. The prograde amphibolite stage is documented by garnet relics preserving prograde zoning and bearing biotite, plagioclase, muscovite, phengite and rutile inclusions. The eclogite stage is characterized by the coexistence of phengite with pyrope-grossularite rich garnet, the latter containing phengite and paragonite inclusions, and by radial fractures within garnet around quartz pseudomorphs after coesite. Symplectites have formed during the amphibolite-facies retrogression. They consist mainly of biotite + plagioclase around phengite and garnet; muscovite, biotite and plagioclase grew along the main foliation. The reconstructed metamorphic evolution, involves a steep prograde and retrograde PT path as well as a HP-T peak. Along with the geochronological evidence of fast exhumation, this supports a model of arc-continent collision, with the HP rocks belonging to the over-riding plate. Their exhumation is mainly controlled by extension related to renewed "rollback" of subduction in front of the orogenic zone.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 3
Title: Ultra-high-pressure metamorphism in felsic rocks; the garnet-phengite gneisses and quartzites from Lanterman Range, Antarctica
Affiliation: Museo Nazionale dell'Antartide, Sezione di Scienze della Terra, Siena, Italy
Pages: 513-525
Published: 200306
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 61
Accession Number: 2003-055036
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch map
S71°45'00" - S71°30'00", E163°00'00" - E163°30'00"
Secondary Affiliation: Universita di Siena, ITA, Italy
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200318
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal