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Carboniferous U-Pb age of the Sebago batholith, southwestern Maine: metamorphic and tectonic implications.

Geological Society of America Bulletin

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Abstract

Two phases (pink and white granite) of the Sebago batholith have been dated by the U/Pb zircon method. The age of both phases is 325 m.y. Zircon in the pink phase has been reset in intrusion of the Pleasant Mountain stock approx 114 m.y. ago. Zircon in the white phase lost lead only recently. Metamorphic isograds in the vicinity of the batholith approximately parallel its shape, and may be at least partly Hercynian in age. Cooling and uplift of the Sebago batholith appear to have followed a complicated path involving little or no uplift in the Middle Carboniferous to Middle Permian, rapid cooling from 275 to 225 m.y. ago, and a slow cooling since Middle Triassic. Different rates of cooling may be related to changes in the tectonic regime.-L.C.H.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Carboniferous U-Pb age of the Sebago batholith, southwestern Maine: metamorphic and tectonic implications.
Series title:
Geological Society of America Bulletin
Volume
96
Issue:
8
Year Published:
1985
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
990
Last page:
996
Number of Pages:
7