Bedrock geology of the Brattleboro quadrangle, Vermont-New Hampshire
The Brattleboro quadrangle of southeastern Vermont and southwestern New Hampshire is underlain principally by metamorphosed Lower to Middle Paleozoic sedimentary and volcanic rocks. The area sits astride portions of three regional tectonic zones, from west to east: the Green Mountain anticlinorium, the Connecticut River-Gaspe synclinorium and the Bronson Hill anticlinorium. The first two of these zones are discussed as the Western Sequence and include strata ranging in age from Precambrian through Silurian. The geology of the Bronson Hill anticlinorium is discussed as the Eastern Sequence covering strata ranging in age from Ordovician to Lower Devonian. Granitic intrusive rocks in the area belong to the Ordovician-aged Oliverian Plutonic Series and the Devonian-aged New Hampshire Plutonic Series. The structural deformation in the area is divided into two major folding stages: an earlier one during which large recumbent folds or nappes developed; and a later one in which the nappes were arched upward by rising domes. At least five stages of minor folding occurred prior to, during and after the major deformational events. Regional metamorphism of the area ranges from the lower greenschist facies to the upper amphibolite facies in a Barrovian-type metamorphic sequence. The principal post-Precambrian metamorphism and structural deformation took place during the Acadian orogeny. 53 figs., 11 tabs.
- Research Organization:
- Vermont Agency of Environmental Conservation, Montpelier (USA)
- DOE Contract Number:
- FG02-81WM46642
- OSTI ID:
- 5705116
- Report Number(s):
- DOE/WM/46642-T1; ON: DE85011027
- Resource Relation:
- Other Information: Bulletin No. 32
- Country of Publication:
- United States
- Language:
- English
Similar Records
Tectono-metamorphic history of southern New Hampshire and southeastern Vermont
Geochronologic studies in central New England I: Evidence for pre-Acadian metamorphism in eastern Vermont