Susceptibility of various tektite types to fluvial abrasion

Brachaniec, Tomasz

doi:10.7306/gq.1461

Artykuł - szczegóły

Tytuł artykułu

Susceptibility of various tektite types to fluvial abrasion

Autorzy

Brachaniec Tomasz

Wybrane pełne teksty z tego czasopisma

http://gq.pgi.gov.pl/gq

Identyfikatory

DOI

10.7306/gq.1461

Warianty tytułu

Języki publikacji

Abstrakty

Tektites are glass bodies, rich in silica, 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 maximum 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

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.

Twórcy

autor

Brachaniec Tomasz

tomasz.brachaniec@o2.pl

University of Silesia; Faculty of Earth Sciences, Department of Geochemisty, Mineralogy and Petrography, Będzińska 60, 41-200 Sosnowiec, Poland

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).

Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-f4b8f1ff-1571-441d-9bd1-784412c196b3