Chemical composition and bulk density of moldavites

Konta, J.; Mráz, L.

doi:10.1016/0016-7037(69)90066-0

Cited by 13 publications

(3 citation statements)

References 5 publications

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“…Philpotts and Pinson (1966) gave Fe 3+ /Fe tot values between 0.07 and 0.15. Konta and Mráz (1969) reported Fe 3+ /Fe tot values for 13 moldavites to be between 0.01 and 0.82. Fudali et al (1987) critically reviewed these data as well as those for other tektites and measured ferric-ferrous iron ratios from 5 randomly selected splashform Australasian tektites.…”

Section: Ferrous-to-ferric Iron Ratios and Iron Coordinationmentioning

confidence: 95%

Moldavites from the Cheb Basin, Czech Republic

Skála

Strnad

McCammon

et al. 2009

Geochimica et Cosmochimica Acta

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Section: Ferrous-to-ferric Iron Ratios and Iron Coordinationmentioning

confidence: 95%

Moldavites from the Cheb Basin, Czech Republic

Skála

Strnad

McCammon

et al. 2009

Geochimica et Cosmochimica Acta

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“…If selective volatilization is operative the trends should approximate those predicted by laboratory vapor fractionation experiments; while, if mixing is the primary cause of the variation there are no restrictions on the trends (other than those imposed by the "close-ended" nature of major element analyses). Vapor fractionation experiments of glasses of tektite composition, under oxidizing conditions, show that Si0 2 and K 20 are the most volatile species, Na 20 is somewhat less volatile, and the other major element oxides are relatively nonvolatile et al (1983) and Cuttitta et al (1967), and moldavite data from Konta and Mraz (1969). (Walter, 1967;Walter and Giutronich, 1967).…”

Section: Selective Volatilization Vs Mixingmentioning

confidence: 97%

Mechanism of Muong Nong‐type tektite formation and speculation on the source of Australasian tektites

Schnetzler

1992

Meteoritics

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The source crater of the youngest and largest of the tektite strewnfields, the Australasian strewnfield, has not been located. A number of lines of evidence indicate that the Muong Nong‐type tektites, primarily found in Indochina, are more primitive than the much more abundant and widespread splash‐form tektites, and are proximal to the source. In this study the spatial distribution of Muong Nong‐type tektite sites and chemical character have been used to indicate the approximate location of the source. The variation of Muong Nong‐type tektite chemical composition appears to be caused by mixing of two silicate rock end‐members and a small amount of limestone, and not by vapor fractionation. The variation in composition is not random, and does not support in‐situ melting or multiple impact theories. The distribution of both Muong Nong and splash‐form tektite sites suggest the source is in a limited area near the southern part of the Thailand‐Laos border.

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“…The number of bubbles is lower in tektites with high temperature of formation (Barnes 1964, 1969; Konta and Mráz 1969; Trnka and Houzar 2002). Bubbles in the tektite types with high temperature of formation are usually more spherical.…”

Section: A Review Of Available Data On Volatile Compound Content and mentioning

confidence: 99%

A review of volatile compounds in tektites, and carbon content and isotopic composition of moldavite glass

Žák

Skála

Řanda

et al. 2012

Meteorit & Planetary Scien

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Abstract-Tektites, natural silica-rich glasses produced during impact events, commonly contain bubbles. The paper reviews published data on pressure and composition of a gas phase contained in the tektite bubbles and data on other volatile compounds which can be released from tektites by either high-temperature melting or by crushing or milling under vacuum. Gas extraction from tektites using high-temperature melting generally produced higher gas yield and different gas composition than the low-temperature extraction using crushing or milling under vacuum. The high-temperature extraction obviously releases volatiles not only from the bubbles, but also volatile compounds contained directly in the glass. Moreover, the gas composition can be modified by reactions between the released gases and the glass melt. Published data indicate that besides CO 2 and ⁄ or CO in the bubbles, another carbon reservoir is present directly in the tektite glass. To clarify the problem of carbon content and carbon isotopic composition of the tektite glass, three samples from the Central European tektite strewn field-moldavites-were analyzed. The samples contained only 35-41 ppm C with d 13 C values in the range from )28.5 to )29.9& VPDB. This indicates that terrestrial organic matter was a dominant carbon source during moldavite formation.

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Chemical composition and bulk density of moldavites

Cited by 13 publications

References 5 publications

Moldavites from the Cheb Basin, Czech Republic

Moldavites from the Cheb Basin, Czech Republic

Mechanism of Muong Nong‐type tektite formation and speculation on the source of Australasian tektites

A review of volatile compounds in tektites, and carbon content and isotopic composition of moldavite glass

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