Bedrock geologic and joint trend map of the Pinardville quadrangle, Hillsborough County, New Hampshire
Open-File Report
2013-1027
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- More information: USGS Index Page
- Plate: Ofr2013 1027 (pdf)
- Companion File: Companion Files
- NGMDB Index Page: National Geologic Map Database Index Page
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Abstract
The bedrock geology of the Pinardville quadrangle includes the Massabesic Gneiss Complex, exposed in the core of a regional northeast-trending anticlinorium, and highly deformed metasedimentary rocks of the Rangeley Formation, exposed along the northwest limb of the anticlinorium. Both formations were subjected to high-grade metamorphism and partial melting: the Rangeley during the middle Paleozoic Acadian orogeny, and the Massabesic Gneiss Complex during both the Acadian and the late Paleozoic Alleghanian orogeny. Granitoids produced during these orogenies range in age from Devonian (Spaulding Tonalite) to Permian (granite at Damon Pond), each with associated pegmatite. In the latest Paleozoic the Massabesic Gneiss Complex was uplifted with respect to the Rangeley Formation along the ductile Powder Hill fault, which also had a left-lateral component. Uplift continued into the early Mesozoic, producing the 2-kilometer-wide Campbell Hill fault zone, which is marked by northwest-dipping normal faults and dilational map-scale quartz bodies. Rare, undeformed Jurassic diabase dikes cut all older lithologies and structures. A second map is a compilation of joint orientations measured at all outcrops in the quadrangle. There is a great diversity of strike trends, with northeast perhaps being the most predominant.
Suggested Citation
Burton, W.C., Armstrong, T.R., 2013, Bedrock geologic and joint trend map of the Pinardville quadrangle, Hillsborough County, New Hampshire: U.S. Geological Survey Open-File Report 2013-1027, 1 Plate: 47.19 × 34.28 inches; Downloads Directory, https://doi.org/10.3133/ofr20131027.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Bedrock geologic and joint trend map of the Pinardville quadrangle, Hillsborough County, New Hampshire |
| Series title | Open-File Report |
| Series number | 2013-1027 |
| DOI | 10.3133/ofr20131027 |
| Year Published | 2013 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Eastern Geology and Paleoclimate Science Center |
| Description | 1 Plate: 47.19 × 34.28 inches; Downloads Directory |
| Country | United States |
| State | New Hampshire |
| County | Hillsborough County |
| Other Geospatial | Pinardville quadrangle |
| Datum | 1983 North American Datum |
| Scale | 24000 |
| Online Only (Y/N) | Y |