1. Nitrogen Concentrations and Isotopic Compositions of Seafloor-Altered Terrestrial Basaltic Glass: Implications for Astrobiology
- Author
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Katsura Kobayashi, L. A. Ranieri, Gray E. Bebout, Neil R. Banerjee, Matthew R.M. Izawa, Kristin Elizabeth Lazzeri, and Eizo Nakamura
- Subjects
010504 meteorology & atmospheric sciences ,Earth, Planet ,Nitrogen ,Oceans and Seas ,Geochemistry ,Volcanic Eruptions ,010502 geochemistry & geophysics ,Ophiolite ,01 natural sciences ,Hydrothermal circulation ,Imaging, Three-Dimensional ,Exobiology ,Research Articles ,0105 earth and related environmental sciences ,Basalt ,geography ,geography.geographical_feature_category ,Bacteria ,Nitrogen Isotopes ,Silicates ,Palagonite ,Agricultural and Biological Sciences (miscellaneous) ,Seafloor spreading ,Volcanic glass ,Volcanic rock ,Volcano ,13. Climate action ,Space and Planetary Science ,Glass ,Geology - Abstract
Observed enrichments of N (and the δ15N of this N) in volcanic glasses altered on Earth's modern and ancient seafloor are relevant in considerations of modern global N subduction fluxes and ancient life on Earth, and similarly altered glasses on Mars and other extraterrestrial bodies could serve as valuable tracers of biogeochemical processes. Palagonitized glasses and whole-rock samples of volcanic rocks on the modern seafloor (ODP Site 1256D) contain 3–18 ppm N with δ15Nair values of up to +4.5‰. Variably altered glasses from Mesozoic ophiolites (Troodos, Cyprus; Stonyford volcanics, USA) contain 2–53 ppm N with δ15N of −6.3 to +7‰. All of the more altered glasses have N concentrations higher than those of fresh volcanic glass (for MORB
- Published
- 2018
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