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(Received: 20/11/2008, in revised form: 5/5/2009)

Mineralogy, geochemistry and genesis of carbonate – silica serpentines (listwaenite) in north of Nain ophiolite

(west of central Iran)

M. Saidi1*, S. Falahati1, M. Noghreyan1, M. Khalili 1, M. Ghahraipour2

1- Department of Geology, University of Isfahan 2- Geological Survey of Iran

Abstract: The mantle sequence serpentinized peridotites of north of Nain have been converted to carbonate- silica assemblage known as listwaenite at various temperature and pH in response to CO2 and SiO2 bearing fluids. On the basis of carbonate and silica minerals content, three types of listwaenite have been recognized: carbonate, carbonate- silica and silica listwaenites. Generaly carbonate minerals are magnesite, dolomite, ferrite-dolomite and ankerite. Calcite and other carbonate minerals are rare. Silica minerals (including quartz, chalcedony and chert) accompanied by accessory Cr-spinel, chlorite, sulfide minerals also occur in listwaenites. Silica matrix in silica listwaenite containing high amounts of Hg, Ag and As elements and shows that these elements have transported by SiO2 bearing hydrothermal fluids as arsenide complexes.

KeyWords: peridotites, Listwaenite, Nain ophiolite, mercury

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Vol. 17, No. 3, Fall 1388/2009

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[4��� [1] Rose G., ”Mineralogisch – geognostische Reise nach dem Ural, dem Altai und dem kaspischen Meere". Volume 2: "Reise nach dem sudlichen Urals und dem kaspischen Meere, Uebersicht der Mineralien und Gebirgsarten des Ural. Berlin, G. E. Reimer (Verlag der sanderschen Buchhandlung)", XV plus 606p and paltes I-V. (1873).

Cr Ni Mg

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[2] Buisson G., M. Leblanc, "Gold in carbonatized ultramafic rocks from ophiolite complexes",Economic Geology, 80, (1983) 2026-2029.[3] Henderson F. B., “Hydrothermal alteration and ore deposition in serpentinite- type mercury deposites”, Economic Geology, 64(1969) 489-499. [4] Davoudzadeh M., “Geology and Petrography of the area north of Nain Central Iran”,Geological Survey of Iran, Report No.14. (1972) 89p.

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���� ! "�#$�!� ��$=.a9 i/R ����9 {�!@0�)����(��

�E� .[15] Emami M. H., Sadegi M. M., Omrani S. J., “Magmatic Map of Iran", Scale 1.1,000,000, Geological Survey of Iran. (1993).

]��[�b(<��B��� L.<-!�& �%.�"$��:+,�- �1�23�:��������+,"+,�- ���-�1 �7��$8_! . �1�23��)6�-

�&$_)����([17] Aydal s., “Gold – bearing listwaenites in the Arac Massif, Kastamonu, Turkey, Terra Nova”,vol. 2 No. 1. 1990, Pp. 43-51. [18] Turekian K. K., Wedepohl K. W., "Distribution of the elements in some major units of the earths crust", Geological Society of America Bulletin, 72, (1961) 175 192. [19] Kretz R, "Symbols for rock-forming minerals", American Mineralogists, v. 68, (1983) p. 277-279. [20] Nasir S., Al Sayigh A.R., Al Harthy A., Al- Khirbash S., Al- Jaaid O., Musllam A. A., Al Mishwat A., Saidi S., Al- Bu, "Mineralogical and Geological characterization of listwaenite from the Semail ophiolite", Oman, Chemie der Erde-Geochemistry, Article in press.

]��[}&5 +�- %.i.� �2,�! �.N �B�8C �.5 ��&9 S/ %.i.�"���5-+,�- ��1�23�d!�! . ���?8A�1 �,6g&� ��?,3 <!/B �*,8�[ >)� <

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[23] Taylor S. R., Mc Lennan S. M., "The

continental crust: its composition and evolution",Blackwell, Oxford (1985). [24] Taylor S. R., Mc Lennan S. M., "The

composition and evolutions of the continental crust: rare earth element evidence from sedimentary rocks", Phil. Trans. R. Soc., (1981) A 301381 – 399.

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