Skip to Main Content
GEOREF RECORD

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

T. Mark Harrison, Frank S. Spear and Matthew T. Heizler
Geochronologic studies in central New England; II, Post-Acadian hinged and differential uplift
Geology (Boulder) (February 1989) 17 (2): 185-189

Abstract

(super 40) Ar/ (super 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.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 17
Serial Issue: 2
Title: Geochronologic studies in central New England; II, Post-Acadian hinged and differential uplift
Affiliation: State Univ. N.Y., Dep. Geol. Sci., Albany, NY, United States
Pages: 185-189
Published: 198902
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 23
Accession Number: 1989-026871
Categories: GeochronologyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N42°30'00" - N44°00'00", W73°00'00" - W71°30'00"
Secondary Affiliation: Rensselaer Polytech. Inst., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1989
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal