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Clay Minerals; June 2003; v. 38; no. 2; p. 187-199; DOI: 10.1180/0009855033820088
© 2003 Mineralogical Society of Great Britain and Ireland
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Palygorskite genesis through silicate transformation in Tunisian continental Eocene deposits

F. JAMOUSSI1, A. BEN ABOUD2 and A. LÓPEZ-GALINDO2,*

1 Laboratoire ‘Géoressources’, INRST BP 95, 2050 Hamam-Lif, Tunisia, and 2 Instituto Andaluz de Ciencias de la Tierra, CSIC-Universidad de Granada, Facultad de Ciencias, Fuentenueva s/n, 18002 Granada, Spain

* E-mail: alberto{at}ugr.es

(Received 30 April 2002; revised 21 October 2002)

The mineralogical and geochemical characteristics of Eocene continental sediments in south central Tunisia (Chebket Bouloufa and Jebel Hamri) and in north central Tunisia (Jebel Lessouda and Jebel Rhéouis), which contain considerable amounts of palygorskite, were studied. The clay fraction of the sediments also comprises illite, kaolinite, Mg smectite and Al smectite, together with carbonates (calcite and/or dolomite), quartz, gypsum and feldspars, all of which are present in extremely variable proportions.

The textural characteristics of the samples containing most palygorskite, as well as the chemical composition of the fibres and the contents of certain trace and rare earth elements suggest that the genesis of this fibrous clay is intimately linked to the diagenetic transformation of illite, mixed-layered minerals and/or Al smectite, as has also been observed in contemporaneous deposits in Morocco.

KEYWORDS: palygorskite, illite, Tunisia, Eocene




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H. L. HONG, N. YU, P. XIAO, Y. H. ZHU, K. X. ZHANG, and S. Y. XIANG
Authigenic palygorskite in Miocene sediments in Linxia basin, Gansu, northwestern China
Clay Minerals, March 1, 2007; 42(1): 45 - 58.
[Abstract] [Full Text] [PDF]




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