Natural black glass resembling australite fragments

Baker, G.

doi:10.24199/j.mmv.1956.20.03

Cited by 2 publications

(1 citation statement)

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“…This study raises a number of perspectives. As tektites and volcanic glasses can be easily confused, care must be taken not only for new possible tektite occurrences outside known strewn fields but also for the collection of volcanic pseudotektites within recognized tektite strewn fields (e.g., Baker, 1956). Visual examination may not be sufficient to detect these pseudotektites, as exemplified by specimen 2191 whose aspects are perfectly tektite-like.…”

Section: Discussionmentioning

confidence: 99%

Obsidian and mafic volcanic glasses from the Philippines and Vietnam found in the Paris Museum Australasian tektite collection

Rochette

Bezaeva

Beck

et al. 2022

Meteorit & Planetary Scien

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During the systematic magnetic susceptibility survey of the Paris Museum Australasian tektite collection, we identified three previously overlooked occurrences of volcanic glass that resembles tektites, based on anomalous magnetic properties, high water content, the presence of microcrystals, and anomalous chemical composition. These occurrences are from the Phu Yen province in south‐central Vietnam (two rhyolitic glass fragments) and from the Philippines: one from northern Luzon Island (a basaltic rounded etched glass), one from Santa Mesa near Manilla (a dozen small rounded rhyolitic gravels). The two occurrences in the Philippines are quite similar to previously described volcanic glasses from the nearby Pagudpod and Nagcarlan localities, respectively. The rhyolitic glass specimens from the Phu Yen province are the first documentation of a geological occurrence of obsidian in Vietnam. This work is a warning note that glass samples with anomalous properties found among tektite collections may correspond to volcanic pseudotektites instead of real tektites with anomalous composition. The basaltic glass sample from the Philippines locally shows microcrystalline quench textures previously unknown in natural samples. These findings may also be of interest for archeologists involved in glass artifacts sourcing.

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Section: Discussionmentioning

confidence: 99%

Obsidian and mafic volcanic glasses from the Philippines and Vietnam found in the Paris Museum Australasian tektite collection

Rochette

Bezaeva

Beck

et al. 2022

Meteorit & Planetary Scien

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Micro-forms of hay-silica glass and of volcanic glass

Baker

1968

Mineral. mag. j. Mineral. Soc.

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SummaryIn view of recently reported microtektites in deep-sea sediments north-west, south-west, and south of Australia, attention is drawn to the occurrence of minute forms of hay-silica glass among the products of incineration of opal-bearing vegetation in haystacks, and to the minute forms of volcanic glass ejected in lava fountains. These terrestrial micro-forms of glass have properties within the range of those for the fossil glassy bodies named ‘microtektites’. It is possible that the fusion of opal contained in silica-accumulator plants during fierce, prehistoric forest, bush, and grass fires in Australia generated micro-forms of glass that became readily airborne and drifted away in up-currents. Carried by the south-east Trades, they would ultimately descend over the Wharton Basin in the Indian Ocean. Strong to violent northerlies and north-easterlies (Brickfielder Winds) would carry them over the ocean south and south-west of Australia. Thus they could contribute to the deposits of bodies of glass regarded as microtektites in deep-sea sediments. Many microbodies of glass in the Wharton Basin could have had their origin in the Javanese volcanic eruptions.

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Natural black glass resembling australite fragments

Cited by 2 publications

References 1 publication

Obsidian and mafic volcanic glasses from the Philippines and Vietnam found in the Paris Museum Australasian tektite collection

Obsidian and mafic volcanic glasses from the Philippines and Vietnam found in the Paris Museum Australasian tektite collection

Micro-forms of hay-silica glass and of volcanic glass

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