气候变化领域集成服务门户(CCPortal): Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot

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DOI	10.1016/j.epsl.2020.116352
	Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot
	Méjean P.; Pinti D.L.; Kagoshima T.; Roulleau E.; Demarets L.; Poirier A.; Takahata N.; Sano Y.; Larocque M.
发表日期	2020
ISSN	0012821X
卷号	545
英文摘要	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 17.7±9.6% 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 21±10Ra and 33±28Ra (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. © 2020 Elsevier B.V.
关键词	groundwater helium isotopes magma aging Monteregian Hills New England hotspot noble gases
英文关键词	Aquifers; Groundwater resources; Helium; Intelligent systems; Minerals; Monte Carlo methods; Isotopic measurement; Magmatic intrusions; Monteregian Hills; North american plates; North Atlantic Ocean; Quebec , Canada; Regional aquifers; St. lawrence lowlands; Biological materials preservation; aquifer; clinopyroxene; fossil record; groundwater; helium isotope; hot spot; igneous intrusion; Canada; New England; Quebec [Canada]; Saint Lawrence Lowlands; United States
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202779
作者单位	Laboratoire des Geosciences Environnement Toulouse (GET), Observatoire Midi-Pyrénnées (OMP), 14 avenue Edouard Belin, Toulouse, 31400, France; GEOTOP, Département des sciences de la Terre et de l'atmosphère, Université du Québec à Montréal, CP888, Succ. Centre-Ville, Montréal, QC H3C 3P8, Canada; Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba 277-8564, Japan; STRATAGEM974, 62 boulevard du Chaudron, Ste Clotilde, La Réunion, 97490, France; Centre Universitaire de Formation en Environnement et développement durable (CUFE), Université de Sherbrooke, Longueuil, QC J4K 0A8, Canada
推荐引用方式 GB/T 7714	Méjean P.,Pinti D.L.,Kagoshima T.,et al. Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot[J],2020,545.
APA	Méjean P..,Pinti D.L..,Kagoshima T..,Roulleau E..,Demarets L..,...&Larocque M..(2020).Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot.Earth and Planetary Science Letters,545.
MLA	Méjean P.,et al."Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot".Earth and Planetary Science Letters 545(2020).