An occurrence of polymorphic halloysite in granite saprolite of the Bayerischer Wald, Germany

Autor:	E. Murad, B. M. Wilke, U. Schwertmann
Rok vydání:	1978
Předmět:	Geochemistry Mineralogy 020101 civil engineering 02 engineering and technology engineering.material Saprolite 010502 geochemistry & geophysics 01 natural sciences Halloysite 0201 civil engineering Geochemistry and Petrology engineering Geology 0105 earth and related environmental sciences
Zdroj:	Clay Minerals. 13:67-77
ISSN:	1471-8030 0009-8558
Popis:	XRD, DTA and IR patterns showed clay veins filling fissures in a granite of the Bayerischer Wald (eastern Bavaria) to consist mainly of hydrated halloysite of low crystallinity with traces of gibbsite, 2:1 (mixed layer) clay minerals and iron oxides. The halloysite forms thin plates which exhibit varying degrees and types of enrolment, resulting in platy, tubular and spheroidal crystals within the same sample. Concentrations of the trace elements Rb, Sr, Ba, Zr, Y, Ce, Pb, Zn and Cu indicate halloysite formation to have taken place via an aqueous phase under the influence of vadose waters circulating in fissures.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::8d924812702354efd6f1c524fa6f862a https://doi.org/10.1180/claymin.1978.013.1.06 Zobrazit plný text záznamu