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Acadian metamorphism associated with the Lexington batholith, Bingham, Maine

American Journal of Science

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Abstract

The Lexington batholith in western Maine intruded upper crustal rocks in three pulses, now exposed as the north, central, and south lobes. A study of the metamorphosed pelitic rocks surrounding the batholith has shown that this terrane was subjected to three metamorphic subevents of the major event, M2 over a short time interval at about 400 Ma. Following M1, a low-grade event, cordierite, andalusite, and sillimanite + K-feldspar were produced by the contact metamorphic subevent (M2n) associated with the north lobe. Then a metamorphic subevent of more regional extent (M2) produced garnet, staurolite, and andalusite in the southern half of the study area. Isograd patterns suggest that this subevent was largely concentric with, and broadly related to, the central and south lobes of the batholith. Staurolite, andalusite, and sillimanite were produced by slightly later contact metamorphic subevent (M2s) produced by the central and south lobes. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Acadian metamorphism associated with the Lexington batholith, Bingham, Maine
Series title:
American Journal of Science
Volume
289
Issue:
8
Year Published:
1989
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
American Journal of Science
First page:
945
Last page:
974
Number of Pages:
30