| 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 |
| Genre: | Article |
| ProdID: | 70015337 |
| Citation Author: | Dickerson, R. P.; Holdaway, M. J. |
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| Citation End Page: | 974 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | American Journal of Science |
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| Citation Number Of Pages: | 30 |
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| Citation Search Results Text: | Acadian metamorphism associated with the Lexington batholith, Bingham, Maine; 1989; Article; Journal; American Journal of Science; Dickerson, R. P.; Holdaway, M. J. |
| Citation Start Page: | 945 |
| Citation Volume: | 289 |
| Citation Year: | 1989 |
| Type: | citation/reference |
| Text: | Acadian metamorphism associated with the Lexington batholith, Bingham, Maine; 1989; Article; Journal; American Journal of Science; Dickerson, R. P.; Holdaway, M. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1989 00:00 -0600 |
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