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U-Th-total Pb dating of monazite from orthogneisses and their ultra-high temperature metapelitic enclaves; implications for the multistage tectonic evolution of the Madurai Block, southern India

Ingo Braun and Peter Appel
U-Th-total Pb dating of monazite from orthogneisses and their ultra-high temperature metapelitic enclaves; implications for the multistage tectonic evolution of the Madurai Block, southern India
European Journal of Mineralogy (August 2006) 18 (4): 415-427

Abstract

EPMA dating of monazite in enclaves of sapphirine-bearing granulites and their host granites from the SE part of the Madurai Block is reported. The granulites are strongly migmatitic and comprise quartzofeldspathic leucosome veins and restitic domains of sapphirine, garnet, orthopyroxene, sillimanite and cordierite. Inclusions of sapphirine-quartz intergrowths in garnet testify to an UHT stage of metamorphism; this was followed by decompression during which garnet was replaced by coronitic intergrowths of orthopyroxene and sillimanite. Monazite inclusions in garnet, orthopyroxene and quartz give a bimodal age distribution of mid- to early Neoproterozoic (1500-850 Ma) ages in the cores which are rimmed by late Neoproterozoic age domains (630-580 Ma). Monazites in the granite and the charnockite exclusively yield Pan-African values.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 18
Serial Issue: 4
Title: U-Th-total Pb dating of monazite from orthogneisses and their ultra-high temperature metapelitic enclaves; implications for the multistage tectonic evolution of the Madurai Block, southern India
Affiliation: Universitaet Bonn, Mineralogisch-Petrologisches Institut, Bonn, Federal Republic of Germany
Pages: 415-427
Published: 200608
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 33
Accession Number: 2006-069699
Categories: GeochronologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, anals., geol. sketch map
N09°25'00" - N09°25'00", E77°34'60" - E77°34'60"
Secondary Affiliation: Universitaet Kiel, DEU, Federal Republic of Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 200640
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