Triple oxygen isotope composition of Australasian tektites

Karel ZAK1, Roman SKALA1, Andreas PACK2, Lukas ACKERMAN1, and Sarka KRIZOVA1,3
Meteoritics & Planetary Science (in Press) Link to Article []
1Institute of Geology of the Czech Academy of Sciences, Rozvojova 269, CZ-165 00 Praha 6, Czech Republic
2Geowissenschaftliches Zentrum, Abteilung Isotopengeologie, Universität Göttingen,Goldschmidtstraße 1, D-37077 Göttingen, Germany
3Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science,Charles University, Albertov 6, CZ-128 43 Praha 2, Czech Republic
Published by arrangement with John Wiley & Sons

Major and trace element analyses and triple oxygen isotope measurements were performed on 11 individual specimens of Australasian tektites (AAT) with exactly known field positions from Laos. The sample set was dominated by Muong Nong‐type tektites (MNAAT), including separated layers of glass of different appearance and chemistry from four samples. This first larger set of oxygen isotope data of MNAAT revealed the δ18O range 8.7 ≤ δ18O ≤ 11.6‰ on VSMOW2 scale (12 analyses), only slightly wider than the previously reported range for splash‐form AAT. The Δ’17O values of MNAAT (−0.098 ≤ Δ’17O ≤ −0.069‰; 12 analyses) and splash‐form AAT (−0.080 ≤ Δ’17O ≤ −0.068‰; three analyses) are all in the range of data typical for terrestrial crustal rocks, with no mass‐independent oxygen isotope fractionation (from impactor or from exchange with atmospheric O2) being observed.


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