Mantle helium in Southern Quebec groundwater: A possible fossil record of the New England hotspot

Pauline Méjean,Daniele L. Pinti,Takanori Kagoshima,Emilie Roulleau, Laura Demarets,André Poirier,Naoto Takahata,Yuji Sano,Marie Larocque

Earth and Planetary Science Letters（2020）

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摘要

•Modern groundwater from Southern Quebec contain up to 18% of mantle helium.•This helium could be a fossil record of the Cretaceous Monteregian Hills (MH).•Mantle helium is diluted with time by radiogenic 4He before released in water.•Monte Carlo simulations of a “magma aging” model was done to estimate initial 3He/4He.•Initial 3He/4He of 21–33 × the atmospheric ratio suggests that MH resulted from a hotspot source.

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关键词

noble gases,helium isotopes,groundwater,magma aging,Monteregian Hills,New England hotspot

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