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Quartzites beneath pyroclastic flows – mineralogical aspects
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SYSNO ASEP 0029254 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title Quartzites beneath pyroclastic flows – mineralogical aspects Title Kvarcity v podloží pyroklastických proudů - mineralogické aspekty Author(s) Malý, Karel (GLU-S) SAI
Cajz, Vladimír (GLU-S) RID, SAI, ORCIDSource Title Mineralia Slovaca - ISSN 0369-2086
Roč. 37, č. 3 (2005), s. 370-371Number of pages 2 s. Language eng - English Country SK - Slovakia Keywords quartzite ; ignimbrite ; mineralogy Subject RIV DB - Geology ; Mineralogy R&D Projects IAA3013302 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30130516 - GLU-S (2005-2011) Annotation Quartzites of the Skalice/Žitenice type near Litoměřice, Ohře Rift graben, were produced by quartz cementation of Paleogene sands derived from the Upper Cretaceous Merboltice Formation sandstones. Their mineralogical and geochemical studies were motivated by the find of their spatial relationship to a flow of basic ignimbrite. Two types of quartz cementation were documented implying different silicification settings: 1. the zone of permanent groundwater saturation, and 2. the overlying unsaturated zone exposed to higher temperatures, with crystallographically confined quartz overgrowths. Results of microprobe studies of the latter type of cement and the overlying ignimbrite revealed parallels (elevated Al2O3 contents) confirming their genetic relationship. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Tel.: 226 800 273 Year of Publishing 2006
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