Exploration of tektite formation processes through water and metal content measurements

Watt, N.; Bouchet, Romain A.; Lee, Cin-Ty A.

doi:10.1111/j.1945-5100.2011.01207.x

Cited by 5 publications

(4 citation statements)

References 30 publications

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“…In fact, tektites belong to the most volatile-depleted natural materials on Earth, often with < 100 p.p.m. H 2 O 8 – 10 and low contents of other volatiles (<30–40 p.p.m. C) 11 .…”

Section: Introductionmentioning

confidence: 99%

Zhamanshin astrobleme provides evidence for carbonaceous chondrite and post-impact exchange between ejecta and Earth’s atmosphere

Magna

Žák

Pack³

et al. 2017

Nat Commun

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Chemical fingerprints of impacts are usually compromised by extreme conditions in the impact plume, and the contribution of projectile matter to impactites does not often exceed a fraction of per cent. Here we use chromium and oxygen isotopes to identify the impactor and impact-plume processes for Zhamanshin astrobleme, Kazakhstan. ε54Cr values up to 1.54 in irghizites, part of the fallback ejecta, represent the 54Cr-rich extremity of the Solar System range and suggest a CI-like chondrite impactor. Δ17O values as low as −0.22‰ in irghizites, however, are incompatible with a CI-like impactor. We suggest that the observed 17O depletion in irghizites relative to the terrestrial range is caused by partial isotope exchange with atmospheric oxygen (Δ17O = −0.47‰) following material ejection. In contrast, combined Δ17O–ε54Cr data for central European tektites (distal ejecta) fall into the terrestrial range and neither impactor fingerprint nor oxygen isotope exchange with the atmosphere are indicated.

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“…In fact, tektites belong to the most volatile-depleted natural materials on Earth, often with < 100 p.p.m. H 2 O 8 – 10 and low contents of other volatiles (<30–40 p.p.m. C) 11 .…”

Section: Introductionmentioning

confidence: 99%

Zhamanshin astrobleme provides evidence for carbonaceous chondrite and post-impact exchange between ejecta and Earth’s atmosphere

Magna

Žák

Pack³

et al. 2017

Nat Commun

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“…A number of studies determined the tektite water content by Fourier transformed infrared spectroscopy (FTIR). The determined water content in tektites from the four best known strewn fields and the newly discovered Belize tektites range from 20 ppm to about 500 ppm (Gilchrist et al 1969;Koeberl and Beran 1988;Beran and Koeberl 1997;Watt et al 2011;Giuli et al 2013). These data led to the general agreement that the high temperatures to which melt droplets were subjected during impact melting were responsible for the very low water content of tektites compared to water content of terrestrial target rocks.…”

Section: Water Content Of Tektites and Microtektitesmentioning

confidence: 97%

Tektites and microtektites iron oxidation state and water content

Giuli

2017

Rend. Fis. Acc. Lincei

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“…12 Instituto di Geologia y Geofisica CIGEO, Universidad Nacional Autónoma de Nicaragua, Managua, Nicaragua. * email: matteo.masotta@ unipi.it higher water content (up to 300 ppm) as compared to splashform tektites (up to 209 ppm) 13,14 and microtektites collected in Antarctica (< 20-206 ppm) 15 and a lower concentration of 10 Be as compared to ablated tektites from Australia 16 and microtektites from Antarctica 17 . These geochemical and isotopic data indicate a deeper origin in the target rock of MN tektites and a consequently lower ejection velocity, which suggests that they are closer to the source crater than tektites from the rest of the strewn field outside of Indochina 18 .…”

Section: Openmentioning

confidence: 99%

3D X-ray tomographic analysis reveals how coesite is preserved in Muong Nong-type tektites

Masotta

Peres

Folco

et al. 2020

Sci Rep

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Muong Nong-type (MN) tektites are a layered type of tektite associated to the Australasian strewn field, the youngest (790 kyr) and largest on Earth. In some MN tektites, coesite is observed in association with relict quartz and silica glass within inclusions surrounded by a froth layer. The formation of coesite-bearing frothy inclusions is here investigated through a 3D textural multiscale analysis of the vesicles contained in a MN tektite sample, combined with compositional and spectroscopic data. The vesicle size distribution testifies to a post-shock decompression that induced melting and extensive vesiculation in the tektite melt. Compared to free vesicles, nucleated homogeneously in the tektite melt, froth vesicles nucleated heterogeneously on relict quartz surfaces at the margins of coesite-bearing inclusions. The rapid detachment of the froth vesicles and prompt reactivation of the nucleation site favoured the packing of vesicles and the formation of the froth structure. Vesicle relaxation time scales suggest that the vesiculation process lasted few seconds. The formation of the froth layer was instrumental for the preservation of coesite, promoting quenching of the inclusion core through the subtraction of heat during froth expansion, thereby physically insulating the inclusion until the final quench of the tektite melt.

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Exploration of tektite formation processes through water and metal content measurements

Cited by 5 publications

References 30 publications

Zhamanshin astrobleme provides evidence for carbonaceous chondrite and post-impact exchange between ejecta and Earth’s atmosphere

Zhamanshin astrobleme provides evidence for carbonaceous chondrite and post-impact exchange between ejecta and Earth’s atmosphere

Tektites and microtektites iron oxidation state and water content

3D X-ray tomographic analysis reveals how coesite is preserved in Muong Nong-type tektites

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