Moldavites from the Cheb Basin, Czech Republic

Skála, Roman; Strnad, Ladislav; McCammon, Catherine; Čada, Miroslav

doi:10.1016/j.gca.2008.11.003

Cited by 29 publications

(42 citation statements)

References 71 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: 88%

“…4c) resulting in large chemical variability; relative standard deviations of averaged data exceed 10 % for Ca, Mg, Na, Fe, and Ti (Mn is not considered due to low overall content). The compositional variability is illustrated in Figs 6-9 where the new data are compared to the published ones (Koeberl et al 1988;Lange 1995;Skála et al 2009) as well as authors' unpublished EPMA analyses for moldavites from other sub-strewn fields.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Figure 8 shows strong positive correlations between MgO and CaO, which have been reported Brachaniec et al (2014Brachaniec et al ( , 2015, Lusatian moldavites by Lange (1995), and Austrian moldavites by Koeberl et al (1988). Data for South Bohemian, Moravian, Cheb and partly Lusatian moldavites either come from Skála et al (2009) and Di Vincenzo and Skála (2009) or they represent unpublished authors' analyses. Also note that analyses of Polish moldavites from Gozdnica (purple triangle) and North Stanisław (green diamond) sandpits from Brachaniec et al (2015) display low analytical totals indicating some analytical artefacts.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…10] were traditionally used to distinguish moldavites found in different substrewn fields (e.g., Delano and Lindsley 1982). However, it was later demonstrated (e.g., Koeberl et al 1988;Skála et al 2009) that the utility of these diagrams is rather limited. Indeed, the high-Si low-Ca-Mg glass of the sample NS-4 mimics CET from the Moravian sub-strewn field whereas low-Si high-Ca-Mg glass of schlieren plots in the region characteristic mostly of moldavites from the Cheb Basin and partly also from the South Bohemian sub-strewn field.…”

Section: Chemical Compositionmentioning

confidence: 99%

“…Source materials of CET were identified as mineralogically and chemically variable sediments of the Upper Freshwater Molasse (Obere Süßwasser Molasse) (von Engelhardt et al 1987(von Engelhardt et al , 2005Skála et al 2009 and references therein). Recently, a possible role of organic matter has been discussed by Řanda et al (2008) and Žák et al (2012).…”

Section: Introductionmentioning

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: 88%

Section: Chemical Compositionmentioning

confidence: 99%