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U-Pb Garnet, Sphene, Monazite, and Rutile Ages: Implications for the Duration of High-Grade Metamorphism and Cooling Histories, Adirondack Mts., New York

Mezger, K., Rawnsley, C. M., Bohlen, S. R., Hanson, G. N.·1991·The Journal of Geology
DOI 10.1086/629503
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Abstract

U-Pb ages were determined on metamorphic garnets, monazites, sphenes, and rutiles in metapelites and marbles from the Adirondacks to determine the duration of metamorphism, the timing of mineral growth, and the cooling history. Garnet ages for the Lowlands range from 1168-1127 Ma, those from the central and southern Highlands from 1154-1013 Ma. The ages indicate that metamorphism may have begun synchronously throughout the Adirondacks, but high-grade conditions existed over a period of about 150 Ma in the Highlands and only about 40 Ma in the Lowlands. Metamorphism in the Highlands may not have occurred as a single event but rather in several discrete thermal pulses. An age of $$1153 \pm 3 Ma$$ was determined for garnets in the syn-regional metamorphic contact aureole of the Diana syenite, consistent with that of the syenite intrusion, $$1155 \pm 4 Ma$$ (U-Pb zircon, Grant et al. 1986). Garnets just outside the contact aureole give an age of $$1168 \pm 6 Ma$$. In the Lowlands, monazite yielded an age of $$1161 \pm 1 Ma$$, rutiles yielded ages of $$1005 \pm 2 Ma$$ and $$953 \pm 4 Ma$$, and sphene ages range from 1156 to 1103 Ma. In the Highlands, monazite yielded an age of $$1033 \pm 1 Ma$$, rutiles yielded ages of $$911 \pm 2 Ma$$ and $$885 \pm 2$$ and sphenes from 1033 Ma to 991 Ma. The rutile and monazite ages indicate that both terranes cooled at time-integrated rates of ca. 1.5°C/Ma for at least 150 Ma following the last phase of high-grade metamorphism. The Lowlands cool…

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  • More recent studies point towards a much higher closure temperature in sphene.

    “However, more recent studies point towards a much higher Tc in sphene (Heaman and Parrish 1991;Mezger et al. 1991a).”

    From U-Pb geochronology of the Grenville Orogen of Ontario and New York: constraints on ancient crustal tectonics (1993) · cites this paper as Mezger et al. 1991a

  • The closure temperature for sphene is about 550 to 650 °C depending on the grain size.

    “A comparison of sphene ages with ages of other minerals in the Adirondacks and reevaluation of sphene data from the contact aureole of the Duluth Gabbro (Hanson et al. 1971) led to the suggestion that the closure temperature for sphene is about 550 to 650 ~ depending on the grain size (Mezger et al. 1991a).”

    From U-Pb geochronology of the Grenville Orogen of Ontario and New York: constraints on ancient crustal tectonics (1993) · cites this paper as Mezger et al. 1991a

  • The closure temperature for monazite is about 725 °C.

    “The closure temperature for monazite is taken to be about 725 ~ (Copeland et al. 1988;Mezger et al. 1991a;Parrish 1991).”

    From U-Pb geochronology of the Grenville Orogen of Ontario and New York: constraints on ancient crustal tectonics (1993) · cites this paper as Mezger et al. 1991a

  • The 1153 Ma age from the Sharbot Lake domain is similar to ages from the Frontenac domain and Adirondack Lowlands and supports a close affinity of the Sharbot Lake and Frontenac domains in terms of their thermal histories.

    “This age is similar to those obtained from the Frontenac domain and Adirondack Lowlands (Mezger et al. 1991a) and supports a close affinity of the Sharbot Lake and Frontenac domains in terms of their thermal histories.”

    From U-Pb geochronology of the Grenville Orogen of Ontario and New York: constraints on ancient crustal tectonics (1993) · cites this paper as Mezger et al. 1991a

  • Similar time-integrated denudation rates and cooling rates have been reported from the Adirondacks, Archean Pikwitonei granulite domain, Lewisian granulites and from model calculations.

    “Similar time-integrated denudation rates and cooling rates have been reported from the Adirondacks (Mezger et al. 1991a), Archean Pikwitonei granulite domain (Mezger et al. 1990), Lewisian granulites (Humphries and Cliff 1982) and from model calculations (Pitman and Golovchencko 1991).”

    From U-Pb geochronology of the Grenville Orogen of Ontario and New York: constraints on ancient crustal tectonics (1993) · cites this paper as Mezger et al. 1991a

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Metadata

Authors
Mezger, K., Rawnsley, C. M., Bohlen, S. R., & Hanson, G. N.
Venue
The Journal of Geology
Publisher
University of Chicago Press
Published
1991-05
Volume
99
Issue
3
Pages
415-428
ISSN
  • 0022-1376
  • 1537-5269
DOI
10.1086/629503
Cited by
288
References
1
Language
en

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