Nitrogen contents and isotopic ratios of clasts from the enstatite chondrite Abee |
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| Authors: | Mark H Thiemens Robert N Clayton |
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| Institution: | Enrico Fermi Institute, University of Chicago, Chicago, IL 60637U.S.A. |
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| Abstract: | Nitrogen contents and isotopic ratios have been determined for three clasts from the enstatite chondrite Abee by stepwise heating. The clasts possess a wide range in nitrogen content, ranging from 254 to 850 ppm, whereas the nitrogen isotopic ratios are nearly identical atδ15N= ?29.2±0.6‰. A refractory inorganic nitrogen-bearing phase contains about 90% of the nitrogen which is released at temperatures of 1000°C and above. The stepwise heating experiments suggest the possible existence of two other distinct nitrogen components, released at low (770°C) and high (1500°C) temperatures. |
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