Ammonoosuc Volcanics: Difference between revisions
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| ⚫ | The '''Ammonoosuc Volcanics''' are a rock unit in parts of New Hampshire and Vermont, USA. This unit is named for the Ammonoosuc River that runs through the the portion of New Hampshire that houses the Ammonoosuc Volcanics.<ref name=":0">{{Cite journal|last=Valley|first=Peter M.|last2=Walsh|first2=Gregory J.|last3=Merschat|first3=Arthur J.|last4=McAleer|first4=Ryan J.|date=2019-12-11|title=Geochronology of the Oliverian Plutonic Suite and the Ammonoosuc Volcanics in the Bronson Hill arc: Western New Hampshire, USA|url=https://doi.org/10.1130/GES02170.1|journal=Geosphere|volume=16|issue=1|pages=229–257|doi=10.1130/GES02170.1|issn=1553-040X}}</ref> |
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= Ammonoosuc Volcanics for editing = |
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| ⚫ | The '''Ammonoosuc Volcanics''' are a rock unit in parts of New Hampshire and Vermont, USA. This unit is named for the Ammonoosuc River that runs through the the portion of New Hampshire that houses the Ammonoosuc Volcanics.<ref name=":0">{{Cite journal|last=Valley|first=Peter M.|last2=Walsh|first2=Gregory J.|last3=Merschat|first3=Arthur J.|last4=McAleer|first4=Ryan J.|date=2019-12-11|title=Geochronology of the Oliverian Plutonic Suite and the Ammonoosuc Volcanics in the Bronson Hill arc: Western New Hampshire, USA|url=https://doi.org/10.1130/GES02170.1|journal=Geosphere|volume=16|issue=1|pages=229–257|doi=10.1130/GES02170.1|issn=1553-040X}}</ref> |
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== Setting == |
== Setting == |
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Revision as of 17:12, 18 March 2021
The Ammonoosuc Volcanics are a rock unit in parts of New Hampshire and Vermont, USA. This unit is named for the Ammonoosuc River that runs through the the portion of New Hampshire that houses the Ammonoosuc Volcanics.[1]
Setting
The Ammonoosuc Volcanics are a component of the Bronson Hill arc, which is approximately 400 km long and reaches from the Quebec border down to southern Connecticut.[1] The Bronson Hill arc is made up of both volcanic and plutonic sequences of felsic and mafic rocks, all of which are Ordivician-aged.[1] The Bronson Hill arc is also sometimes referred to as the Bronson Hill anticlinorium.[2] The geographical setting of the Ammonoosuc Volcanics and the Bronson Hill arc is thought to be the location of the now closed Iapetus Ocean. [3]
Origin
The origin of the Ammonoosuc Volcanics can be traced back to the Taconic orogeny, an Ordivician mountain-building event in the New England area that occurred after the Bronson Hill arc accreted to the existing continent.[3] The Ammonoosuc volcanics formed on the opposite side of the Iapetus Ocean, but as it closed, they got closer until they were eventually accreted as part of the Bronson Hill arc.[2] IT is thought that the Ammonoosuc Volcanics were formed by partial-melting of basaltic materials during this time.[4][5]
Mineralogy
The Ammonoosuc Volcanics are an interlayered unit. The first layer is a mafic amphibolite primarily composed of hornblende and plagioclase and the second layer is metamorphosed felsic quartz tuff.[4] The unit is heavily intruded by many dikes, sills, and small sections of gneiss and schist.[4]
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References
- ^ a b c Valley, Peter M.; Walsh, Gregory J.; Merschat, Arthur J.; McAleer, Ryan J. (2019-12-11). "Geochronology of the Oliverian Plutonic Suite and the Ammonoosuc Volcanics in the Bronson Hill arc: Western New Hampshire, USA". Geosphere. 16 (1): 229–257. doi:10.1130/GES02170.1. ISSN 1553-040X.
- ^ a b Aleinikoff, John N. (1977-11-01). "Petrochemistry and tectonic origin of the Ammonoosuc Volcanics, New Hampshire–Vermont". GSA Bulletin. 88 (11): 1546–1552. doi:10.1130/0016-7606(1977)882.0.CO;2. ISSN 0016-7606.
- ^ a b J, DoraisMichael; AtkinsonMiles; KimJon; P, WestDavid; A, KirbyGregory (2011-07-20). "Where is the Iapetus suture in northern New England? A study of the Ammonoosuc Volcanics, Bronson Hill terrane, New Hampshire11This article is one of a series of papers published in this CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology". Canadian Journal of Earth Sciences. doi:10.1139/e10-108.
- ^ a b c Leo, Gerhard W. (1985-12-01). "Trondhjemite and metamorphosed quartz keratophyre tuff of the Ammonoosuc Volcanics (Ordovician), western New Hampshire and adjacent Vermont and Massachusetts". GSA Bulletin. 96 (12): 1493–1507. doi:10.1130/0016-7606(1985)962.0.CO;2. ISSN 0016-7606.
- ^ Moench, Robert H.; Aleinikoff, John N. (2002-01-01). "Stratigraphy, geochronology, and accretionary terrane settings of two Bronson Hill arc sequences, northern New England". Physics and Chemistry of the Earth, Parts A/B/C. TACONIC CONVERGENCE. 27 (1): 47–95. doi:10.1016/S1474-7065(01)00003-1. ISSN 1474-7065.