Physics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2513l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 12, pp.2513-2526
Physics
7
Scientific paper
U-Pb isotope analyses on major and accessory minerals from pelitic schists in of southwestern Connecticut are used to date metamorphism and deformation. Most of the major minerals have 206 Pb/ 204 Pb ratios less than 100. However, U-Pb mineral isochron and mineral-whole rock isochrons, constructed using aliquots of the same mineral, yield concordant ages with uncertainties as low as 5 Ma. Staurolite, kyanite, and garnet are older than metamorphic monazites and zircons. These data are summarized below: 5. Transposed pegmatitic intrusions in The Straits Schist yield monazites with U-Pb ages analytically indistinguishable from those of metamorphic monazites and zircons in the schists. Growth of monazite and zircon in the schists may be related to high- T fluid influx associated with pegmatite intrusion. Age discordance in the garnets from The Straits Schist is most consistent with continuous loss of intermediate daughter products of the 238 U decay chain from about 420 Ma to 380 Ma. Garnets from the adjacent Trap Falls Formation do not display this behavior.
Hanson Gilbert N.
Lanzirotti Antonio
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