Evidence for isovolumetric replacement in some terra rossa profiles of Northern Jordan

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Bäumler R, Lucke B, Kemnitz H
Zeitschrift: Boletín de la Sociedad Geológica Mexicana
Verlag: Sociedad Geológica Mexicana
Jahr der Veröffentlichung: 2012
Band: 64
Heftnummer: 1
Seitenbereich: 21-35
ISSN: 1405-3322


Abstract


We investigated the rock-soil transition zones of three different Terra Rossa profiles near the ancient site of Abila, in northern Jordan, in order to demonstrate the possibility of a metasomatic origin for these soils using a scanning electron microscope (SEM) equipped with an energy-dispersive system (EDS). The field interpretation suggested that the first Terra Rossa might partially have formed by isovolumetric replacement, the second appeared to represent mainly the residue of the underlying limestone, and the third seemed to be derived from colluvial material. However, all investigated rock-soil transition zones showed microfossils that had partially been replaced by clay, which could be geochemically confirmed using EDS. The replacement matrix was free of detrital clay and revealed a jelly-like, amorphous structure. Large phyllosilicates, some rare feldspars, and heavy minerals that occurred throughout the investigated rock-soil transition zones are probably remains of sandy interlayers in the weathered limestone. We conclude that isovolumetric replacement contributes to Terra Rossa formation in northern Jordan although it is not yet possible to quantify the extent of its contribution or the sources that supply the elements triggering the pressure-driven growth of clay minerals.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Bäumler, Rupert Prof. Dr.
Professur für Geographie
Lucke, Bernhard PD Dr.
Institut für Geographie


Zitierweisen

APA:
Bäumler, R., Lucke, B., & Kemnitz, H. (2012). Evidence for isovolumetric replacement in some terra rossa profiles of Northern Jordan. Boletín de la Sociedad Geológica Mexicana, 64(1), 21-35.

MLA:
Bäumler, Rupert, Bernhard Lucke, and Helga Kemnitz. "Evidence for isovolumetric replacement in some terra rossa profiles of Northern Jordan." Boletín de la Sociedad Geológica Mexicana 64.1 (2012): 21-35.

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Zuletzt aktualisiert 2018-10-08 um 05:39