Published 2022-05-01
“…<span class="inline-formula">−9 ‰</span> VPDB<span class="note-anchor" id="fna_Ch1.Footn1"><a href="#fn_Ch1.Footn1"><sup>1</sup></a></span> and <span class="inline-formula">−2 ‰</span> VPDB), <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M19" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msub><mi mathvariant="normal">CO</mi><mn mathvariant="normal">2</mn></msub><msup><mo>/</mo><mn mathvariant="normal">3</mn></msup><mi mathvariant="normal">He</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="48pt" height="16pt" class="svg-formula" dspmath="mathimg" md5hash="f571d99770c11306333b27ed5ca30b11"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="hess-26-2637-2022-ie00009.svg" width="48pt" height="16pt" src="hess-26-2637-2022-ie00009.png"/></svg:svg></span></span> ratio (between <span class="inline-formula">1.9×10<sup>8</sup></span> and <span class="inline-formula">2.9×10<sup>9</sup></span>) and <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M22" display="inline" overflow="scroll" dspmath="mathml"><mrow class="chem"><msup><mi/><mn mathvariant="normal">3</mn></msup><mi mathvariant="normal">He</mi><msup><mo>/</mo><mn mathvariant="normal">4</mn></msup><mi mathvariant="normal">He</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="46pt" height="15pt" class="svg-formula" dspmath="mathimg" md5hash="5e8bb6b618862902b1a0e7bf75a65b08"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="hess-26-2637-2022-ie00010.svg" width="46pt" height="15pt" src="hess-26-2637-2022-ie00010.png"/></svg:svg></span></span> (between 0.92 and 2.
70 Ra) shows with a high level of confidence that the <span class="inline-formula">CO<sub>2</sub></span> in the carbogaseous groundwater of Spa and Bru has a mantle origin. …”
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