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Geological Quarterly

Tytuł artykułu

Susceptibility of various tektite types to fluvial abrasion

Autorzy Brachaniec, Tomasz 
Treść / Zawartość
Warianty tytułu
Języki publikacji EN
EN Tektites are glass bodies, rich in sill ca, resulting from the impact of a large bolide into ground rocks. Similar to other impactites they are prone to erosive processes, including fluvial abrasion. This study reports the results of an experimental tumbling that aimed at estimating the potential distance that tektites from different strewn fields (moldavites, bediasites and indochinites) and Libyan Desert Glass (LDG) can withstand depending on the experimental conditions. The present study consisted of 15 cycles, in which the type of sample deposits (i.e. sand/gravel ratio) and computed transport velocity were changed, the latter being estimated at 2.5-6.5 km/h. The results clearly confirm the susceptibility of tektites to abrasion during tumbling. None of the tektites withstood the estimated distance of 12 km during the experiment, but this may have been the result of the relatively small initial size of the glasses (~1.5 g). These experiments document that LDG, despite its even smaller initial size in the experiments, can resist abrasion and fragmentation better than the tektites, thus, could probably be transported farther in a stream environment. This is most likely caused by a much higher silica content in relation to the tektites from other groups. The estimated max I mum transport distances, over which moldavites, bediasites and indochinites survived in the experiments, are all very similar. The greatest weight loss for all the specimens was found after the first estimated 2 km of tumbling. This is undoubtedly caused by the irregular initial shape of the tektites and LDG. Subsequent observations recorded minor weight losses, in association with more and more rounded glass shapes. The results of the study should be treated only as a general scheme for the fluvial abrasion of tektites, due to the inability to accurately reproduce the natural fluvial environment.
Słowa kluczowe
EN tektites   reworking   abrasion   redeposition   river   gravel  
Wydawca Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
Czasopismo Geological Quarterly
Rocznik 2019
Tom Vol. 63, No. 1
Strony 150--161
Opis fizyczny Bibliogr. 55 poz., rys., tab., wykr.
autor Brachaniec, Tomasz
  • University of Silesia; Faculty of Earth Sciences, Department of Geochemisty, Mineralogy and Petrography, Będzińska 60, 41-200 Sosnowiec, Poland,
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Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).
Kolekcja BazTech
Identyfikator YADDA bwmeta1.element.baztech-f4b8f1ff-1571-441d-9bd1-784412c196b3
DOI 10.7306/gq.1461