NDLI: Alunite characterization in the upper Eocene clay deposits of Central Tunisia: an implication to its genesis

Content Provider	Springer Nature Link
Author	Gaied, Mohamed Essghaier Chaabani, Fredj Gallala, Wissem
Copyright Year	2015
Abstract	Alunite mineral was recently identified at the upper Eocene clay deposits associated with laminated primary gypsum and iron oxide in Central Tunisia, particularly at El Gnater site. The alunite characterization has been performed by several analytical techniques [atomic absorption spectroscopy (AAS), X- ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA) and differential thermal analysis (DTA)]. The mean features of their chemical composition are its deficiency of Al, water excess content, small replacement of K by Na and absence of impurities such as Fe. The X-ray diffraction pattern reveals the purity of the alunite samples. The SEM micromorphological study shows a compact facies which is made up by homogeneous pseudocubic microcrystals having approximately the same diameters of 1 μm. Thermal behaviour of El Gnater alunite closely matches published literature which shows two major endothermic peaks at 528 and 744 °C with total weight loss 17.27 and 29.09 %, respectively. The former corresponds to the dehydroxylation processes and the latter corresponds to sulphate decomposition reaction. The association of studied alunite with laminated primary gypsum, hematite and clay minerals implies its late diagenetic origin in reduced conditions and in evaporitic environment. However, jarosite was produced by oxidation of pyrite which was very abundant in the claystone host.
Starting Page	347
Ending Page	356
Page Count	10
File Format	PDF
ISSN	08912556
Journal	Carbonates and Evaporites
Volume Number	30
Issue Number	3
e-ISSN	18785212
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-03-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Alunite Late diagenesis Upper Eocene Clay Gypsum Jarosite Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Diagenesis of the Middle Eocene Upper Dammam Subformation, Qatar: Petrographic and isotopic evidence

Phosphorite-hosted zinc and lead mineralization in the Sekarna deposit (Central Tunisia)

Pressure-oxidation autoclave as an analogue for acid–sulphate alteration in epithermal systems

Properties of Mestaoua evaporites (southern Tunisia) for plaster industry

Characterization of lacustrine carbonate reservoirs in the Eocene Sikou Sag, Bohai Bay Basin, East China

Upper Cretaceous facies development and depositional environments, Gebel Somar area, north central Sinai, Egypt

Geology, mineralogy, and genesis of palygorskite clay from Borshchevka deposit in the Kaluga Region and outlook for its technological use

Stratigraphy, sedimentology, and structural geology of gypsum caves in east central New Mexico

Petrography, diagenesis and depositional model for potash deposits of north central Iran, and use of Bromine geochemistry as a prospecting tool

Alunite characterization in the upper Eocene clay deposits of Central Tunisia: an implication to its genesis

Similar Documents

Diagenesis of the Middle Eocene Upper Dammam Subformation, Qatar: Petrographic and isotopic evidence

Phosphorite-hosted zinc and lead mineralization in the Sekarna deposit (Central Tunisia)

Pressure-oxidation autoclave as an analogue for acid–sulphate alteration in epithermal systems

Properties of Mestaoua evaporites (southern Tunisia) for plaster industry

Characterization of lacustrine carbonate reservoirs in the Eocene Sikou Sag, Bohai Bay Basin, East China

Upper Cretaceous facies development and depositional environments, Gebel Somar area, north central Sinai, Egypt

Geology, mineralogy, and genesis of palygorskite clay from Borshchevka deposit in the Kaluga Region and outlook for its technological use

Stratigraphy, sedimentology, and structural geology of gypsum caves in east central New Mexico

Petrography, diagenesis and depositional model for potash deposits of north central Iran, and use of Bromine geochemistry as a prospecting tool

Alunite characterization in the upper Eocene clay deposits of Central Tunisia: an implication to its genesis