Noble Gas Isotopes and Nitrogen Isotopologues Reveal Deep Sources and Subsurface Fractionation in Yellowstone Gases

ACS Earth and Space Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

Nitrogen plays a critical role in maintaining Earth's hospitable surface environment over geological time. Despite our atmosphere being dominated by nitrogen, understanding of how nitrogen was delivered to Earth and subsequent planetary processes modified budget through time is currently lacking. Here, we report measurements isotopologues N2 (Δ30), along with ultrahigh precision Ar, Kr, Xe isotopes, hydrothermal gas samples from Yellowstone National Park. We show that δ15N variations are correlated nonradiogenic isotope ratios, indicating groundwater-derived noble gases fractionated the same process as they diffuse rising column magmatic CO2. Notably, similar correlation exists regardless degree atmospheric contamination, suggesting mantle source (i.e., ∼0‰). Two component mixing models between Δ30 demonstrate N2/36Ar (5.3 ± 0.7 × 105) 36Ar/130Xe (1611 212) lower greater than MORB source, respectively, contrary previous findings, plume has not been more efficiently overprinted addition N2- Xe-rich recycled material. Conversely, suggest similarity chondritic meteorites indicates deep reflect composition material initially formed Earth.

Language: Английский

Volcano-tectonic controls on magma residence time in arc crusts: Insights from noble gas geochemistry in the Andean Southern Volcanic Zone.

Earth and Planetary Science Letters, Journal Year: 2025, Volume and Issue: 661, P. 119352 - 119352

Published: April 23, 2025

Language: Английский