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STUDY OF THE ARGILLIZED (BENTONITIZED) DEPOSITS IN GURASADA AREA - SOUTHER APUSENI MOUNTAINS, ROMANIA

Ciprian Constantina, Delia-Georgeta Dumitraş, Alexandru Laslo-Faur, Nicolae Călin, Iuliana Pasuk

First published: 2020-09-20https://doi.org/10.5593/sgem2020/1.1/s01.040View metrics

Abstract

This paper proves news about the argillized (bentonitized) deposits that are part of a complex distribution of volcanic rock types occurring in the Gurasada region. These are the oldest deposits of volcanic origin crops out in the Gurasada open pit. Above these are volcanic deposits of andesitic composition represented by pyroclastic breccias, rare tuff levels and lava flows. The site observations, petrographic, XRD, RAMAN spectroscopy and chemical analyses indicated the formation of the bentonite deposit by weathering of a vitroclastic tuff, probably of dacitic composition, belonging to a first (more felsic) eruptive stage consisting of Plinian-type explosive volcanism. Given that the cover deposits were Radiometric dating (K/Ar method) within a period of 69 to 80 million years ago, it is confirmed that these volcanoes belong to the laramic cycle (Senonian). Bentonite from Gurasada is of lower quality being exploited especially for the preparation of drilling fluids.

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Title
STUDY OF THE ARGILLIZED (BENTONITIZED) DEPOSITS IN GURASADA AREA - SOUTHER APUSENI MOUNTAINS, ROMANIA
Authors
Ciprian Constantina, Delia-Georgeta Dumitraş, Alexandru Laslo-Faur, Nicolae Călin, Iuliana Pasuk
Proceedings
SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 20th SGEM International Multidisciplinary Scientific GeoConference Proceedings 2020, Science and Technologies in Geology, Exploration And Mining
Publisher
STEF92 Technology
Year
2020
Pages
317-324
SWS Citekey
Ciprian20201317324
ISSN
1314-2704
ISBN
978-619-7603-04-0
Language
en
Publication type
Conference Paper
Keywords
GurasadaApuseni Mountainsbentonitemontmorillonitevolcanic
References3

  1. Karnland, O, Olsson, S., Nilsson, U., Mineralogy and sealing properties of various bentonites and smectite-rich clay materials, Technical Report - TR-06-30, Svensk K?rnbr?nslehantering AB, ISSN 1404-0344 CM Digitaltryck AB, Bromma, 2007, 112 p.

  2. Compton, J.S., Conrad, M.E., Venneman, T.W., Stable isotope evolution of volcanic ash layers during diagenesis of Miocene Monterey Formation, California. Clays Clay Miner. 47, 1999, p. 84-95.

  3. Meunier, A. Clays. Ed. Springer-Verlag Berlin Heidelberg, 2005, 472 p

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