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Paper Information

Journal:   JOURNAL OF ECONOMIC GEOLOGY   2014 , Volume 6 , Number 1; Page(s) 49 To 70.
 
Paper: 

GEOCHEMISTRY OF PILLOW LAVAS AND THEIR CLINOPYROXENE: OPHIOLITIC MELANGES OF NAIN AND ASHIN, NORTHEASTERN ISFAHAN PROVINCE

 
 
Author(s):  SHIRDASHTZADEH NARGESS*, TORABI GHODRAT, SAMADI RAMIN
 
* DEPARTMENT OF GEOLOGY, FACULTY OF SCIENCE, UNIVERSITY OF ISFAHAN, IRAN
 
Abstract: 

The Nain and Ashin ophiolites are located in northeastern Isfahan province, in western Central-East Iranian Microplate. Pillow lavas are one of the most significant Cretaceous rock units. The lower partial melting degree in mantle peridotites of Ashin ophiolite, and the derived melt by melting their clinopyroxene caused a more basic (basalt) and enriched nature for the Ashin pillow lavas, whereas higher partial melting degree and consequently incongruent melting of orthopyroxene and increment of silica in the ascending melt, together with aqueous fluids led to formation of more acidic (andesite – basaltic andesite) and depleted melts (in trace elements) in Nain ophiolite. The REE content of Nain samples have IAT chemical affinity, but the samples from Ashin show MORB characteristics. Based on petrograhic observations, lower Eu/Eu* of clinopyroxene phenocrystals of Ashin, calculated Kd of clinopyroxene together with HREE enrichment in the melt in equilibrium with clinopyroxene (especially in Ashin when compared with Nain), the plagioclase crystallization was primer and higher in comparison with clinopyroxene, especially in Ashin compared with Nain. The melt in equilibrium with clinopyroxene in Ashin was similar to MORB composition, whereas it is similar to IAT in Nain. Thus, despite the proximity of these two ophiolitic series and some field and petrographic similarities, pillow lavas from them are different from each other in both primary melt composition and the processes of differentiation and the tectonic setting.

 
Keyword(s): GEOCHEMISTRY, CLINOPYROXENE, PILLOW LAVAS, NAIN OPHIOLITE, ASHIN OPHIOLITE
 
 
References: 
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+ Click to Cite.
APA: Copy

SHIRDASHTZADEH, N., & TORABI, G., & SAMADI, R. (2014). GEOCHEMISTRY OF PILLOW LAVAS AND THEIR CLINOPYROXENE: OPHIOLITIC MELANGES OF NAIN AND ASHIN, NORTHEASTERN ISFAHAN PROVINCE. JOURNAL OF ECONOMIC GEOLOGY, 6(1), 49-70. https://www.sid.ir/en/journal/ViewPaper.aspx?id=404944



Vancouver: Copy

SHIRDASHTZADEH NARGESS, TORABI GHODRAT, SAMADI RAMIN. GEOCHEMISTRY OF PILLOW LAVAS AND THEIR CLINOPYROXENE: OPHIOLITIC MELANGES OF NAIN AND ASHIN, NORTHEASTERN ISFAHAN PROVINCE. JOURNAL OF ECONOMIC GEOLOGY. 2014 [cited 2021May18];6(1):49-70. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=404944



IEEE: Copy

SHIRDASHTZADEH, N., TORABI, G., SAMADI, R., 2014. GEOCHEMISTRY OF PILLOW LAVAS AND THEIR CLINOPYROXENE: OPHIOLITIC MELANGES OF NAIN AND ASHIN, NORTHEASTERN ISFAHAN PROVINCE. JOURNAL OF ECONOMIC GEOLOGY, [online] 6(1), pp.49-70. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=404944.



 
 
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