Abstract
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 MuongNong-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 O-18 range 8.7(18)O11.6 parts per thousand on VSMOW2 scale (12 analyses), only slightly wider than the previously reported range for splash-form AAT. The 'O-17 values of MNAAT (-0.098'O-17-0.069 parts per thousand; 12 analyses) and splash-form AAT (-0.080'O-17-0.068 parts per thousand; 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 O-2) being observed.