Geochemical evidence for the origin of moldavites

Bouška, Vladimír; Benada, J.; Řanda, Z.; Kuncíř, J.

doi:10.1016/0016-7037(73)90250-0

Cited by 30 publications

(29 citation statements)

References 14 publications

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“…earlier (e.g., Bouška and Konta 1986;Koeberl 1990;Trnka and Houzar 2002;Skála et al 2009), and variable trends for CaO vs. K 2 O, which was demonstrated to be unique for the moldavites from the Cheb Basin ). These diagrams also underscore the unusual composition of the high-Ca-Mg schlieren, which is scarce among the c. 5000 available EPMA analyses of moldavites; several comparable data occur only among South Bohemian moldavites.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Mai and Wähnert (2000) and Szynkiewicz (2011) dated this formation to the late Miocene (Pannonian to Pontian) although others (e.g., Piwocki and Ziembińska-Tworzydło, 1997;Kramarska et al 2015) did not exclude, at least partly, a Pliocene age. Bouška (1972Bouška ( , 1988, Bouška and Konta (1986), Bouška and Lange (1999) and Ševčík et al (2007) summarized the stratigraphy of moldavite occurrences in the South Bohemian sub-strewn field. They defined four groups: (1) The oldest sediments, so-called 'strewn field sediments', are called Vrábče Member and are assumed to represent a lateral equivalent of the basal part of the Domanín Fm.…”

Section: Stratigraphy and Paleogeography Of The Moldavite-bearing Locmentioning

confidence: 99%

“…These diagrams also underscore the unusual composition of the high-Ca-Mg schlieren, which is scarce among the c. 5000 available EPMA analyses of moldavites; several comparable data occur only among South Bohemian moldavites. No analysis of the sample NS-4, however, corresponds to the so-called HCa/Mg-types (CaO/MgO ~2.0) identified in the South Bohemian (Bouška and Konta 1986) or Cheb ) sub-strewn fields. A broad linear trend between Na 2 O and K 2 O observed for South Bohemian, Moravian and Lusatian moldavites is not so obvious for the NS-4 moldavite (Fig.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Numerous authors noted the brittle character of moldavite glass, which displays substantial strain due to its thermal history and, consequently, constrains the length of transport (e.g., Bouška and Konta 1986;Trnka and Houzar 2002). Finds of moldavites near Prague (Žebera 1972) and in Germany (Lange 1995(Lange , 1996 raised questions about the durability of these glasses during fluvial transport and a possibility of re-deposition over few tens or even hundreds km.…”

Section: Size Morphology and Chemical Compositionmentioning

confidence: 99%

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New constraints on the Polish moldavite finds: a separate sub-strewn field of the central European tektite field or re-deposited materials?

Skála¹,

Jonášová²,

Žák³

et al. 2016

J. Geosci.

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Rusko and Mielęcin represent the most remote localities from the Ries impact structure with the distance of about 475 km. The previously published data were limited to electron-microprobe analyses of four specimens. Here we provide additional compositional data for a single moldavite from the North Stanisław sandpit near Rusko. Combined data of electron microprobe (EPMA; major elements) and laser-ablation inductively-coupled--plasma mass spectrometry (LA-ICP-MS; minor and trace elements) provide new insights into chemical variability of CET. Electron-microprobe analyses supplemented with back-scattered electron images showed marked chemical heterogeneity of the Polish moldavite on the micrometre scale, confirmed also by LA-ICP-MS. The major-element composition of the volumetrically dominating glass of the specimen is indistinguishable from the majority of c. 5000 available EPMA analyses of moldavites from other regions and, consequently, it does not provide any unambiguous link to any of these sub-strewn fields. Rare schlieren in the sample with unique Ca-Mg-rich composition have counterparts among several South Bohemian moldavites. In general, Polish moldavites are small (less than 0.5 g) irregular fragments or splinters of angular shape with multistage sculpturing. Their morphological character and paleogeography of Central Europe in the last 15 Myr suggest that they were redeposited at time of the Gozdnica Fm. sedimentation from yet unknown sub--strewn field north of the Sudetic Mountains. : moldavites, tektites, Lower Silesia, Poland, Ries impact structure, geochemistry Received: 4 December, 2015; accepted: 3 May, 2016; handling editor: E. Jelínek The online version of this article (doi: 10.3190/jgeosci.214) contains supplementary electronic material. KeywordsCentral European tektites (CET) are called moldavites. They were formed from the uppermost sedimentary rocks layer during the Ries-Steinheim impact event in Miocene. The recent occurrences of CET in several small areas (sub-strewn fields) reflect the paleogeography at the time of impact as well as further geological history of the area.

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Section: Chemical Compositionmentioning

confidence: 99%

Section: Stratigraphy and Paleogeography Of The Moldavite-bearing Locmentioning

confidence: 99%

Section: Chemical Compositionmentioning

confidence: 99%

Section: Size Morphology and Chemical Compositionmentioning

confidence: 99%

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New constraints on the Polish moldavite finds: a separate sub-strewn field of the central European tektite field or re-deposited materials?

Skála¹,

Jonášová²,

Žák³

et al. 2016

J. Geosci.

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“…COHEN (1963), BousKA (1972), andBOUSKA et al (1973) compared the REE con tents of moldavites with those of rocks in the Ries area in Germany, TAYLOR (1968) and his coworkers compared the contents of australites with those of Henbury impact glass, and WINZER et al (1976) have studied REE in the shock melted rocks from the Wanapitei Lake in Cana da. HASKIN and GEHL (1963) and CHASE et al .…”

Section: Introductionmentioning

confidence: 99%

Major elements and REE in tektites and three probable shock-metamorphic rock series of the Baltic shield.

Koljonen¹,

Rosenberg²

1976

Geochem. J.

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REE contents of four tektites from separate strewn-fields have been determined and the REE and major elements in ten shock-metamorphic rocks from lakes Lappajarvi , Saaksjarvi (Finland), and Tinisjarvi (Soviet Karelia). Neither the impact of meteorite or comet nor secondary weathering seems to change the REE content or distribution pattern in rocks. Therefore, where the texture and major element compo sition in country rock has changed through impact and after it, REE can be used as indicators of the original rock or sediment type. The surfaces of the Moon and each planet, including the earth, probably have unique REE distribution patterns as a result of the prevailing endogenic and exogenic processes . The distribution patterns of REE in tektites, are quite similar to those found in sediments, sedimentary rocks and shock-melted rocks. Accordingly, the origin of tektites from silica-rich clayey sediments or silicic rocks through impact is strongly indicated.

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