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Characterization and distribution of fibrous tremolite and chrysotile minerals in the Eskisehir region of western Turkey

S. Kadir and H. Erkoyun
Characterization and distribution of fibrous tremolite and chrysotile minerals in the Eskisehir region of western Turkey
Clay Minerals (February 2016) 50 (4): 441-458

Abstract

Because of widespread tremolite and chrysotile minerals in Palaeozoic-Mesozoic metamorphic and Triassic ophiolitic units, respectively, in the Eskisehir region, Turkey, there is significant potential for development of cases of mesothelioma. Such occurrences in the Eskisehir region show a positive correlation with the concentration and dimension of tremolite crystals compared with those of chrysotile crystals. A detailed assessment of the mineralogy, geochemistry and genesis of these materials has not been carried out to date; the present study was undertaken to fill that gap. The sharp diagnostic basal reflections at 8.14 Aa, 3.09 Aa and at 7.30 Aa, 3.63 Aa, well defined fibrous crystallinity, and ideal differential thermal analysis-thermal gravimetric and Raman curves suggest the development of well crystallized fibrous/acicular tremolite and chrysotile with the average structural formulae of: (Na (sub 0.07) K (sub 0.03) )(Ca (sub 1.68) Mg (sub 0.18) Mn (sub 0.01) )(Fe (sub 0.42) Mg (sub 4.55) Ti (sub 0.01) )(Si (sub 7.60) Al (sub 0.24) Fe (sub 0.16) )O (sub 22) (OH) (sub 2) , and (Mg (sub 5.55) Fe (sub 0.41) Mn (sub 0.006) )(Si (sub 3.79) Al (sub 0.13) )O (sub 10) (OH) (sub 8) , respectively. Enrichment of light rare earth elements relative to medium rare earth elements and heavy rare earth elements in tremolite compared to that of chrysotile which exhibits no anomaly and negative anomalies for Ba, Sr, Ce, Nb, Y and Zr in the tremolite samples and chrysotile, are responses to the fractionation of feldspar, glaucophane, pyroxene and olivine under the high temperatures of hydrothermal-alteration processes during serpentinization and the high-pressure conditions of metamorphism. Based on H and O isotope data, the tremolite and chrysotile are thought to have developed from tectonically controlled magmatic and meteoric hydrothermal systems and the formation temperatures of the tremolite are higher than those of chrysotile.


ISSN: 0009-8558
EISSN: 1471-8030
Coden: CLMIAF
Serial Title: Clay Minerals
Serial Volume: 50
Serial Issue: 4
Title: Characterization and distribution of fibrous tremolite and chrysotile minerals in the Eskisehir region of western Turkey
Affiliation: Eskisehir Osmangazi University, Department of Geological Engineering, Eskisehir, Turkey
Pages: 441-458
Published: 201602
Other Date: 201509
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 76
Accession Number: 2016-025706
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrologyEnvironmental geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N39°40'00" - N39°40'00", E31°10'00" - E31°10'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201613
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