Study of the effect of the nature of the rodingite forming ...ijcm.ir/article-1-594-fa.pdf · S....
Transcript of Study of the effect of the nature of the rodingite forming ...ijcm.ir/article-1-594-fa.pdf · S....
(Received: 8/4/2008, in revised form: 20/7/2008)
Study of the effect of the nature of the rodingite forming fluids in the minerals of the rodingite of Nain ophiolite
S. Falahaty, M. Saidi, M. Noghreyan, M. Khalili, Gh. Torabi, M. A. Machizadeh Department of Geology, Isfahan University
[email protected] Email:
Abstract: Two types of rodingitization (static and dynamic) are observed in the rodingites of the ophiolite north of Nain. Two stages have been occurred in the formation of static rodingites. At the initial stage, epidote, prehnite and hydrogrossular have crystallized respectively at the expense of plagioclase, with the increase of Calcium content rodingite forming fluid. In the advanced stage, xonotlite at the expense of plagioclase, and Mg – chlorite, tremolite and secondary diopside, at the expense of pyroxene, have formed simultaneously with an increase of Si content of rodingite forming fluid. The high content of vein xonotlite, in the dynamic rodingites, shows that the CaO/SiO2 ratio in the fluid is first close to one, but with time, it reduces to less than one and prehnite and pectolite have crystallized. In the dynamic rodingites, due to the low variations of rock – forming fluids, the mineralogy of dynamic rodingites do not vary much. In contrast, the mineralogy of static rodingites display variation, indicating the changing in composition of rock – forming fluids.
Keyword: Nain ophiolite, Rodingite, Static rodingites, Dynamic rodingites.
Vol. 17, No. 1, Spring 1388/2009
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H�"�� [1] Davoudzadeh, M., "Geology and petrology of the area North of Nain, Central Iran", Geological Survey of Iran, Report 14 (1972) 1 – 79. [2] Coleman, R. G., "Ophiolites, ancient oceanic lithosphere ?", Springer Verlag Berlin, (1977) 1 – 229.[3] Schandle, E. S., D. S., O hanley, and F. J., Wicks, "Rodingites in serpentinized ultramafic rocks of the Abitibi greenstone belt, Ontario", Canadian Mineralogist, (1989) 579 – 591. [4] Emami, M. H., M. M., Sadegi, Omrani, S. J., "Magmatic map Iran, Scale 1/1,000,000", Geological Survey of Iran, (1993). [5] Sabzehei, M., "Rodingitization of Iranian basic rocks, a new interpretation", Journal of Sciences, 13 (2002) 155 – 160. [6] Coleman, R. G., "Low – temperature reaction zones and alpine ultramafic rock of California, Oregon and Washington", U. S. Geology Survey Bulletin, 47 (1967) 1 – 1247.
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[8] Palandri, J. L., M. H., Reed, "Geochemic models of metasomatism in ultramafic systems: serpentinization, rodingitization, and sea floor
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� ��!"# $�%&�#� �:)�#)Tmo� (Th��.[13] Schandle, E. S., D. S., O hanley and F. J., Wicks, "Fluid inclusion in rodingite, a geothermometer serpentinization", Econemic Geology, 85 (1990) 1273 – 1276. [14] Wenner, D. B., "Hydrogen, oxygen and carbon isotopic evidence for the origin of rodingites in serpentinized ultramafic rocks" Geochemica et Cosmochimica Acta, 43 (1978) 603 – 614.
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