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Swanzey Gneiss

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Journal Article

Age and setting of the Bronson Hill magmatic arc: A re-evaluation based on U-Pb zircon ages in southern New England Available to Purchase

R. D. TUCKER, PETER ROBINSON
Journal: GSA Bulletin
Published: 01 October 1990
GSA Bulletin (1990) 102 (10): 1404–1419.
DOI: https://doi.org/10.1130/0016-7606(1990)102<1404:AASOTB>2.3.CO;2
..., yielding an age of 613 ± 3 Ma. Another sample shows strong evidence of zircon inheritance with a minimum mean age of 1402 Ma. Plagioclase-rich gneisses with associated amphibolites (Swanzey, Pauchaug, Monson, and Fourmile gneisses), now believed to represent metamorphosed intrusive igneous rocks, yield...
View PDF for article title, Age and setting of the Bronson Hill magmatic arc: A re-evaluation based on U-Pb zircon ages in southern New England
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Journal Article

GEOLOGY OF THE MONADNOCK REGION OF NEW HAMPSHIRE Available to Purchase

KATHARINE FOWLER-BILLINGS
Journal: GSA Bulletin
Published: 01 August 1949
GSA Bulletin (1949) 60 (8): 1249–1280.
DOI: https://doi.org/10.1130/0016-7606(1949)60[1249:GOTMRO]2.0.CO;2
... in age from Ordovician (?) to late Devonian (?). The metamorphic rocks of the area belong to four formations. The Ordovician (?) Ammonoosuc volcanics, consisting of light-colored, fine-grained biotite gneiss and dark amphibolite, attain a maximum thickness of 600 feet in this region. The Ordovician...
View PDF for article title, GEOLOGY OF THE MONADNOCK REGION OF NEW HAMPSHIRE
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Journal Article

Early Cretaceous Normal Faulting in Southern New England: Evidence from Apatite and Zircon Fission-Track Ages Available to Purchase

Mary K. Roden-Tice, Robert P. Wintsch
Published: 01 March 2002
The Journal of Geology (2002) 110 (2): 159–178.
DOI: https://doi.org/10.1086/338281
... 37.1 348.7 14.1 ± .1 1.2 69 Monson Gneiss Monson Gneiss 32. BH, NH 42.83°/72.36° 144.2 c +32.6/−26.7 9 22.0 ND Swanzey Gneiss Note. Apatite (AFT) and zircon (ZFT) fission-tracking ages given as central ages (Galbraith and Laslett 1993 ). HB = Hartford Basin; WCT...
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View PDF for article title, Early Cretaceous Normal Faulting in Southern New England: Evidence from Apatite and Zircon Fission-Track Ages
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