6533b829fe1ef96bd128a1b0
RESEARCH PRODUCT
�ber den ?Hygrophyllit? im Rotliegenden des Saar-Nahe-Gebietes, ein Beitrag zur Diagenese pyroklastischer Gesteine
Dieter Heimsubject
GeophysicsDevitrificationPermianGeochemistry and PetrologyPumiceRhyoliteGeochemistryPyroclastic rockMineralogyKaoliniteMineral resource classificationGeologyDiagenesisdescription
In certain areas rhyolitic tuffs of the Upper Rotliegend include a greenish, talc-like substance, called “Hygrophyllit”. It has been found too at the base of the Rotliegend in the Saarland. It is shown, that Hygrophyllit corresponds to decomposed pumice, related to the acid permian volcanism. X-ray, DTA and chemical investigations yielded, that Hygrophyllit consists essentially of a mixed layer mica-Ca-montmorillonite with random interstratification and previously about 33 % expandable layers. In consequence there are in the Rotliegend of the Saar-Nahe-Basin three different diagenetic developments of acid pyroclastic rocks: The formation of Kaolinite in the Lower Rotliegend, of devitrification products in the Upper Rotliegend and of an interstratified mica-montmorillouite concerning pumice. The reason for this different diagenesis is discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1971-01-01 | Contributions to Mineralogy and Petrology |