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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.

Study Area

Additional publication details

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: 47.20 x 34.29 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

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