Rb-Sr age of the New Hampshire Plutonic Series

Lyons, John B.; Livingston, Donald E.

doi:10.1130/0016-7606(1977)88<1808:raotnh>2.0.co;2

Cited by 52 publications

(28 citation statements)

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“…The Wildcat Granite is very similar to some exposures of the Blackwater Pluton of the Spaulding Group of the New Hampshire Plutonic Series (Lyons, 1988;Duke, 1978). The Spaulding Group is considered to be late-tectonic, and has been dated at 392 ± 5 Ma (Lyons & Livingston, 1977). Beyond the explanation given above, it is interesting to speculate why Billings & Fowler-Billings (1975) might not have shown the Wildcat Granite on their map-granitization and the origin of granites were "hot topics" at the time they were doing this mapping (1950's).…”

Section: Igneous Rocksmentioning

confidence: 99%

“…Petrologic and geochemical studies suggest that they are anatectic crustal melts (Duke, 1978;Clark & Lyons, 1986;Lathrop, et al, 1994). The oldest of three generations (400 to 390 Ma; Lyons & Livingston, 1977;Barreiro & Aleinikoff, 1985) are the synmetamorphic and syntectonic Kinsman, Bethlehem, and Spaulding groups. These are large, shallow sheet-like bodies that are intimately involved with Acadian nappe structures (Nielson et al, 1976;Thompson et al, 1968), and have isograds mapped across them (Chamberlain & Lyons, 1983).…”

Section: Regional Geologic Settingmentioning

confidence: 99%

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A6: Stratigraphic and Structural Traverse of Mount Moriah and the Wild River Wilderness Area

Allen¹

2017

New England Intercollegiate Geological Conference 2017

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Section: Igneous Rocksmentioning

confidence: 99%

Section: Regional Geologic Settingmentioning

confidence: 99%

A6: Stratigraphic and Structural Traverse of Mount Moriah and the Wild River Wilderness Area

Allen¹

2017

New England Intercollegiate Geological Conference 2017

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“…Recent studies by a number of investigators in the northem Appalachians are defining a minimum time of peak Acadian metamorphism at 385-400 Ma (Dallmeyer 1979;Gaudette et al 1975, manuscript in preparation;Pajari et al 1974;Cormier and Smith 1973;Naylor 1971;Lyons and Livingston 1977;Spooner and Fairbairn 1970). These data and the age of the Union complex of this report strongly suggest that the Acadian event, from final closure of Iapetus and collision of the Avalonian microcontinent through the peak of Acadian deformation, occurred in a period of less than 20 Ma in this part of the northem Appalachian system.…”

Section: Discussionmentioning

confidence: 99%

Zircon isotopic age from the Union ultramafic complex, Maine

Gaudette¹

1981

Can. J. Earth Sci.

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Ultramafic and mafic rocks of the Union complex, Maine, U.S.A. are interpreted as rernnants of Iapetus oceanic crust based upon geological, geochemical, and structural considerations. These rocks were emplaced along a cryptic Acadian suture dunng North Amencan-Avalonian collision. U-Pb analyses of zircons from the quartz diorite portion of the Middle Road unit yield a primary (crystallization) age of 410 + 7 Ma marking a maximum age for collision and disappearance of Iapetus ocean floor.Other studies have shown a minimum time of peak Acadian deformation at 3 8 5 4 Ma, strongly suggesting that the Acadian event occurred in a period of less than 20 Ma in this portion of the northem Appalachians.On interprète les roches ultramaîïques et maîïques du complexe d'Union, dans le Maine, aux Etats-Unis, comme des vestiges de la croûte de l'océan Iapetus en se basant sur des considérations géologiques, géochimiques et structurales. Ces roches ont été mises en place le long d'une suture acadienne occulte durant la collision nord-américaine-avalonienne. Les analyses U-Pb des zircons provenant de la portion de diorite quartzifère de l'unité de Middle Road donne un âge primaire (de cristallisation) de 410 I 7 Ma, ce qui donne un âge maximum pour la collision et la disparition du fond de l'océan Iapetus. D'autres études ont montré une durée minimum pour la déformation acadienne culminante il y a 385-400 Ma, ce qui suggère fortement que l'épisode acadien s'est produit durant une période de moins de 20 Ma dans cette portion des Appalaches du nord.

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“…The Wildcat Granite is very similar to some exposures of the Blackwater Pluton of the Spaulding Group of the New Hampshire Plutonic Series (Lyons, 1988;Duke, 1978). The Spaulding Group is considered to be late-tectonic, and has been dated at 392 ± 5 Ma (Lyons & Livingston, 1977). Beyond the explanation given above, it is interesting to speculate why might not have shown the Wildcat Granite on their map-granitization and the origin of granites were "hot topics" at the time they were doing this mapping (1950's).…”

Section: A6-6mentioning

confidence: 99%

“…Petrologic and geochemical studies suggest that they are anatectic crustal melts (Duke, 1978;Clark & Lyons, 1986;Lathrop, et al, 1994). The oldest of three generations (400 to 390 Lyons & Livingston, 1977;Barreiro & Aleinikoff, 1985) are the synmetamorphic and syntectonic Kinsman, Bethlehem, and Spaulding groups. These are large, shallow sheet-like bodies that are intimately involved with Acadian nappe structures (Nielson et al, 1976;Thompson et al, 1968), and have isograds mapped across them .…”

Section: Regional Geologic Settingmentioning

confidence: 99%