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Colour origin of Tortonian red mudstones within the Mersin area, southern Turkey

Erena, Muhsin and Kadir, Selahattin and Kapur, Selim and Huggett, Jennifer and Zucca, Claudio (2015) Colour origin of Tortonian red mudstones within the Mersin area, southern Turkey. Sedimentary Geology, Vol. 318 , p. 10-19. ISSN 0037-0738. eISSN 1879-0968. Article.

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DOI: 10.1016/j.sedgeo.2014.12.003

Abstract

Fluvial red mudstones of Tortonian age (overbank deposits) are widespread in the Mersin area in southern Turkey. The XRD analysis reveals that the mudstones consist predominantly of smectite, containing 3.0 to 6.6 wt.% Fe2O3, of which ≤ 1% is present as hematite. However this is evidently sufficient hematite to yield a red colour to the whole rock. SEM images show that very fine hematite crystals are disseminated in the mudstones as pore-filling cement between smectite flakes. After reddening, some of the clay and hematite were most likely leached and accumulated with smectite in the shrink–swell fractures as infill. Reddening in the mudstone took place in a terrestrial environment and the hematite pigment formed from intrastratal water by inorganic precipitation at the initial stage of diagenesis. The free Fe2+ was most likely released from the Fe-bearing minerals in an aqueous reducing environment, with hematite being precipitated as cement during the dry periods.

Item Type:Article
ID Code:10593
Status:Published
Refereed:Yes
Uncontrolled Keywords:Computer-assisted orthognathic surgery, facial asymmetry, oOthognathic planning
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Elsevier
ISSN:0037-0738
eISSN:1879-0968
Copyright Holders:Computer-assisted orthognathic surgery; Facial asymmetry; Orthognathic planning
Deposited On:12 Jan 2015 16:08

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