Geochronologic studies in central New England II: Post-Acadian hinged and differential uplift

Journal Article · Wed Feb 01 04:00:00 EST 1989 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1989)017<0185:GSICNE>2.3.CO;2· OSTI ID:7254054

Harrison, T M; Heizler, M T ^[1]; Spear, F S ^[2]

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1. State Univ. of New York, Albany (USA)
2. Rensselaer Polytechnic Institute, Troy, NY (USA)

{sup 40}Ar/{sup 39}Ar analyses of muscovite, biotite, and K-feldspar from central New England reveal a remarkable pattern of mineral ages: the ages are progressively younger from central to western New Hampshire and rise sharply near the Vermont border to ages more typical of post-Acadian cooling. This distribution is attributed to differential uplift via isostatic rebound of an anomalously thickened crust at the Bronson Hill anticlinorium. This explanation requires that between 6 and 8 km of normal fault motion has occurred on structures in western New Hampshire, not previously recognized to have accommodated this kind or magnitude of displacement. This hinged, differential uplift occurred from {approximately} 360-170 Ma and is consistent with a time constant for rebound of {approximately} 80 m.y.

• OSTI ID: 7254054
• Journal Information: Geology; (USA), Journal Name: Geology; (USA) Vol. 17:2; ISSN GLGYB; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
AGE ESTIMATION
APPALACHIAN MOUNTAINS
ARGON 39
ARGON 40
ARGON ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOTITE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FEDERAL REGION I
FELDSPARS
GEOLOGIC DEPOSITS
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GROUND UPLIFT
ISOTOPE DATING
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
MASSACHUSETTS
METAMORPHISM
MICA
MINERALOGY
MINERALS
MOUNTAINS
MUSCOVITE
NEW HAMPSHIRE
NORTH AMERICA
NUCLEI
OROGENESIS
RADIOISOTOPES
SILICATE MINERALS
STABLE ISOTOPES
USA
VERMONT
YEARS LIVING RADIOISOTOPES