Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot
The Monteregian Hills are an alignment of magmatic intrusions of Cretaceous age located in the St. Lawrence Lowlands, Quebec, Canada. Their origin is controversial and numerous studies have failed to decipher between a hotspot trail or sub-continental magmatism related to the opening of the North At...
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ftunivquebec:oai:archipel.uqam.ca:13504 2023-07-16T03:59:54+02:00 Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot Méjean, Pauline Pinti, Daniele L. Kagoshima, Takanori Roulleau, Emilie Demarets, Laura Poirier, André Takahata, Naoto Sano, Yuji Larocque, Marie 2020-09 application/pdf http://archipel.uqam.ca/13504/1/M%C3%A9jean_et_al_EPSL_2020-545-116352.pdf en eng http://archipel.uqam.ca/13504/ http://dx.doi.org/10.1016/j.epsl.2020.116352 doi:10.1016/j.epsl.2020.116352 http://archipel.uqam.ca/13504/1/M%C3%A9jean_et_al_EPSL_2020-545-116352.pdf Méjean, Pauline; Pinti, Daniele L.; Kagoshima, Takanori; Roulleau, Emilie; Demarets, Laura; Poirier, André; Takahata, Naoto; Sano, Yuji et Larocque, Marie (2020). « Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot ». Earth and Planetary Science Letters, 545, p. 116352. Gaz rares hélium eau souterraine Montérégiennes New England hotspot Article de revue scientifique PeerReviewed 2020 ftunivquebec https://doi.org/10.1016/j.epsl.2020.116352 2023-06-24T23:22:54Z The Monteregian Hills are an alignment of magmatic intrusions of Cretaceous age located in the St. Lawrence Lowlands, Quebec, Canada. Their origin is controversial and numerous studies have failed to decipher between a hotspot trail or sub-continental magmatism related to the opening of the North Atlantic Ocean. Here, we show that % of the helium of the modern to Holocene-aged groundwater from the regional aquifer is of mantle origin, with a 3He/4He (R) of up to 1.42 times the atmospheric ratio (Ra). It suggests that a fossil Monteregian Hills magmatic signal, diluted by local radiogenic helium and preserved in the Monteregian Hills intrusions, is leached locally by flowing modern or sub-modern groundwater. Helium isotopic measurements by pyrolysis in Monteregian Hills bulk rocks and clinopyroxene separates show R/Ra values of up to 4.96, suggesting that fossil mantle helium has been partially preserved in these rocks and their mineral phases. Monte Carlo simulations of a magma aging model shows that the initial 3He/4He ratio in these Cretaceous intrusions could have been between Ra and Ra (2σ), favoring the hypothesis that the Monteregian Hills are the product of the passage of the North American plate over the New England hotspot. This study raises the prospect of using modern groundwater as an archive of mantle He over a hundreds of millions of years timescale. Text North Atlantic UQAM - Université du Québec à Montréal: archipel Canada Earth and Planetary Science Letters 545 116352 |
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UQAM - Université du Québec à Montréal: archipel |
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ftunivquebec |
language |
English |
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Gaz rares hélium eau souterraine Montérégiennes New England hotspot |
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Gaz rares hélium eau souterraine Montérégiennes New England hotspot Méjean, Pauline Pinti, Daniele L. Kagoshima, Takanori Roulleau, Emilie Demarets, Laura Poirier, André Takahata, Naoto Sano, Yuji Larocque, Marie Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot |
topic_facet |
Gaz rares hélium eau souterraine Montérégiennes New England hotspot |
description |
The Monteregian Hills are an alignment of magmatic intrusions of Cretaceous age located in the St. Lawrence Lowlands, Quebec, Canada. Their origin is controversial and numerous studies have failed to decipher between a hotspot trail or sub-continental magmatism related to the opening of the North Atlantic Ocean. Here, we show that % of the helium of the modern to Holocene-aged groundwater from the regional aquifer is of mantle origin, with a 3He/4He (R) of up to 1.42 times the atmospheric ratio (Ra). It suggests that a fossil Monteregian Hills magmatic signal, diluted by local radiogenic helium and preserved in the Monteregian Hills intrusions, is leached locally by flowing modern or sub-modern groundwater. Helium isotopic measurements by pyrolysis in Monteregian Hills bulk rocks and clinopyroxene separates show R/Ra values of up to 4.96, suggesting that fossil mantle helium has been partially preserved in these rocks and their mineral phases. Monte Carlo simulations of a magma aging model shows that the initial 3He/4He ratio in these Cretaceous intrusions could have been between Ra and Ra (2σ), favoring the hypothesis that the Monteregian Hills are the product of the passage of the North American plate over the New England hotspot. This study raises the prospect of using modern groundwater as an archive of mantle He over a hundreds of millions of years timescale. |
format |
Text |
author |
Méjean, Pauline Pinti, Daniele L. Kagoshima, Takanori Roulleau, Emilie Demarets, Laura Poirier, André Takahata, Naoto Sano, Yuji Larocque, Marie |
author_facet |
Méjean, Pauline Pinti, Daniele L. Kagoshima, Takanori Roulleau, Emilie Demarets, Laura Poirier, André Takahata, Naoto Sano, Yuji Larocque, Marie |
author_sort |
Méjean, Pauline |
title |
Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot |
title_short |
Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot |
title_full |
Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot |
title_fullStr |
Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot |
title_full_unstemmed |
Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot |
title_sort |
mantle helium in southern quebec groundwater: a possible fossil record of the new england hotspot |
publishDate |
2020 |
url |
http://archipel.uqam.ca/13504/1/M%C3%A9jean_et_al_EPSL_2020-545-116352.pdf |
geographic |
Canada |
geographic_facet |
Canada |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://archipel.uqam.ca/13504/ http://dx.doi.org/10.1016/j.epsl.2020.116352 doi:10.1016/j.epsl.2020.116352 http://archipel.uqam.ca/13504/1/M%C3%A9jean_et_al_EPSL_2020-545-116352.pdf Méjean, Pauline; Pinti, Daniele L.; Kagoshima, Takanori; Roulleau, Emilie; Demarets, Laura; Poirier, André; Takahata, Naoto; Sano, Yuji et Larocque, Marie (2020). « Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot ». Earth and Planetary Science Letters, 545, p. 116352. |
op_doi |
https://doi.org/10.1016/j.epsl.2020.116352 |
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Earth and Planetary Science Letters |
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545 |
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116352 |
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1771548264119664640 |