Quantifying Earth's radiogenic heat budget

Sammon, Laura; McDonough, William F.

doi:10.1002/essoar.10510480.1

Cited by 2 publications

(2 citation statements)

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“…The present‐day radiogenic heating rate of Earth's mantle (excluding the continental crust) Q m , rad remains somewhat uncertain, with most estimates in the 10–20 TW range (Gando et al., 2011; Sammon & McDonough, 2022). Previous thermal evolution studies have demonstrated that large values of Q m , rad ≃ 20 TW can resolve the thermal catastrophe of the mantle (Christensen, 1985; Davies, 2009; Driscoll & Bercovici, 2014), but geochemical evidence implies lower values of Q m , rad ≃ 13 TW (Arevalo et al., 2009; Boyet & Carlson, 2006; Jaupart et al., 2015).…”

Section: Resultsmentioning

confidence: 99%

The “New Core Paradox”: Challenges and Potential Solutions

Driscoll

Davies

2022

JGR Solid Earth

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The "new core paradox" (Olson, 2013) suggests that the persistence of the geomagnetic field over nearly all of Earth history (Bono et al., 2022;Fu et al., 2021;Tarduno et al., 2020) is in conflict with the core being highly thermally conductive (Pozzo et al., 2022;Williams, 2018), which makes convection and dynamo action in the core much harder prior to the nucleation of the inner core. Older theoretical estimates of the thermal conductivity of high pressure iron around 30-50

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Section: Resultsmentioning

confidence: 99%

The “New Core Paradox”: Challenges and Potential Solutions

Driscoll

Davies

2022

JGR Solid Earth

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“…A recent study reported that a stochastic modeling method of 3‐D compositional distribution in the crust was developed and applied to the Japan arc for a better understanding of the local crustal contribution (Takeuchi et al., 2019). Insights from geological perspectives provide the alternative descriptions of the near field lithospheres surrounding the detector, which is providing more accurate models for interpreting the geoneutrino flux measurement (Sammon & McDonough, 2022).…”

Section: Radiogenic Heat Estimation and Discussion Of The Earth Compo...mentioning

confidence: 99%

Abundances of Uranium and Thorium Elements in Earth Estimated by Geoneutrino Spectroscopy

Abe

Asami

Eizuka

et al. 2022

Geophysical Research Letters

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The decay of the primordial isotopes 238U, 235U, 232Th, and 40K has contributed to the terrestrial heat budget throughout the Earth's history. Hence, the individual abundance of those isotopes are key parameters in reconstructing contemporary Earth models. The geoneutrinos produced by the radioactive decays of uranium and thorium have been observed with the Kamioka Liquid‐Scintillator Antineutrino Detector (KamLAND). Those measurements have been improved with more than 18‐year observation time, and improvement in detector background levels mainly with an 8‐year nearly reactor‐free period, which now permit spectroscopy with geoneutrinos. Our results yield the first constraint on both uranium and thorium heat contributions. The KamLAND result is consistent with geochemical estimations based on elemental abundances of chondritic meteorites and mantle peridotites. The High‐Q model is disfavored at 99.76% C.L. and a fully radiogenic model is excluded at 5.2σ assuming a homogeneous heat producing element distribution in the mantle.

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Quantifying Earth's radiogenic heat budget

Cited by 2 publications

References 23 publications

The “New Core Paradox”: Challenges and Potential Solutions

The “New Core Paradox”: Challenges and Potential Solutions

Abundances of Uranium and Thorium Elements in Earth Estimated by Geoneutrino Spectroscopy

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