Emsian synorogenic paleogeography of the Maine Applachians
Journal of Geology
By: D. Bradley and R. Tucker
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Abstract
The Acadian deformation front in the northern Appalachians of Maine and New Hampshire can now be closely located during the early Emsian (Early Devonian; 408-406 Ma). Tight correlations between paleontologically and isotopically dated rocks are possible only because of a new 408-Ma time scale tie point for the early Emsian. The deformation front lay between a belt of Lower Devonian flysch and molasse that were deposited in an Acadian foreland basin and had not yet been folded and a belt of early Emsian plutons that intruded folded Lower Devonian rocks. This plutonic belt includes the newly dated Ore Mountain gabbro (U/Pb; 406 Ma), which hosts magmatic-sulfide mineralization. Along the deformation front, a 407-Ma pluton that locally truncates Acadian folds (Katahdin) was the feeder to volcanic rocks (Traveler Rhyolite; 406-407 Ma) that are part of the foreland-basin succession involved in these same folds. The Emsian igneous rocks thus define a syncollisional magmatic province that straddled the deformation front. These findings bear on three alternative subduction geometries for the Acadian collision.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Emsian synorogenic paleogeography of the Maine Applachians |
| Series title | Journal of Geology |
| DOI | 10.1086/340634 |
| Volume | 110 |
| Issue | 4 |
| Year Published | 2002 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Geology |
| First page | 483 |
| Last page | 492 |
| Google Analytic Metrics | Metrics page |