Geochemistry of hydrothermal alterations associated with epithermal gold mineralization in Masjeddaghi area, east of Jolfa, NW Iran

زمین شناسی اقتصادی

Article 3, Volume 2, Issue 2 - Serial Number 3, January 2011, Pages 199-215   

Document Type: Research Article

DOI: 10.22067/econg.v2i2.7851

Authors

Ali Imamalipour^{* 1}; Hossein Abdeli Eslamlo²; Behzad Haj Alilou²

¹Urmia

²Payame Noor

Abstract

Two types of mineralization including porphyry copper and epithermal gold mineralization have occurred in relation with an intermediate volcano-plutonic complex in Masjeddaghi area. Different alterations including silica, advanced argillic, intermediate argillic and propylitic have been distinguished in relation with epithermal mineralization, which have a zonal pattern. Elemental mass gains and losses during alterations were calculated using Zr as an immobile monitor. Silica zone has enriched in SiO2 and relatively in Al2O3 and K2O, and has depleted in Na2O, MgO and CaO. Ba, Sr, Pb, Rb and Cu elements have also enriched. The advanced argillic zone shows enrichment in SO3, Al2O3, SiO2, K2O, MgO and L.O.I; and depletion in Fe2O3, CaO, Na2O, MnO and MgO. Barium, Cu, Sr and Zn have depleted in this zone. Propylitic zone has enriched in MgO, CaO, L.O.I and SiO2, and has depleted in Na2O and K2O. Geochemical and mineralogical evidences indicate that the hydrothermal leaching of mafic minerals in parent rocks and formation of quartz, kaolinite, sericite and alunite assemblage in advanced argillic zone; and chlorite, epidote and calcite assemblage in propylitic zone is responsible for the above mentioned chemical variations. It is likely that the gains and losses of elements have been controlled by agents such as water/rock ratios, temperature changes and chemistry of hydrothermal solutions. The CIA and MIA indicators in the altered rocks indicate the intensity of alteration in silica and advanced argillic zones in comparison with propylitic zone.

Keywords

Geochemistry; Alteration; Epithermal; Mass changes; Masjeddaghi; Jolfa

References

[1] نبوی، م. ح.،" دیباچه ای بر زمین شناسی ایران"، انتشارات سازمان زمین شناسی کشور، 1355.

[2] آقانباتی، سید علی، "زمین شناسی ایران"، انتشارات سازمان زمین شناسی و اکتشافات معدنی کشور، 1383.

[3] قربانی، م.،" زمین شناسی اقتصادی ذخایر معدنی و طبیعی"، موسسه پژوهشی آرین زمین،1386.

[4] فرد، م.، علی اکبری، ح.، محمدی، ب. و سمایی، س.، "گزارش نقشه زمین شناسی 1000/1 و حفاریهای انجام گرفته در منطقه مسجدداغی (سیه رود جلفا")، پروژه اکتشاف مس و طلا در زون ارسباران ، سازمان زمین شناسی و اکتشافات معدنی کشور، 1384.

[5] عبدلی اسلاملو، ح.،"بررسی ژئوشیمی، دگرسانی و منشأ کانی سازی طلا در منطقه سیه رود استان آذربایجان شرقی"، پایان نامه کارشناسی ارشد، دانشگاه پیام نور، مرکز تبریز،1388 .

[6] امامعلی پور، ع.، عبدلی اسلاملو، ح.، و عابدینی، ع.، "تغییرات جرمی عناصر طی دگرسانیهای گرمابی مرتبط با کانی سازی اپی ترمالی طلا در ناحیه مسجدداغی (شرق جلفا)"، دوازدهمین همایش انجمن زمین شناسی ایران، 30 بهمن 1387، اهواز.

[7] Rollinson, H., “Using geochemical data: evaluation, Presentation”, interpretation, Longman Scientific and Technical, 1993, 352pp,.

[8] Reyes, A.G.,”Petrology of Philippine geothermal systems and The application of alteration mineralogy to their assessment”. Journal of Volcanology and Geothermal Research, Vol.43, 1990, pp. 279-309.

[9] Brown, P.R.L., “Hydrothermal alteration in active geothermal field Review”, Earth planet Science 6, 1978.

[10] Hedenquist, J.W., Arribas , A.Jr. , & Gonzalez-Urien , E., “Exploration for epithermal gold deposits” : Reviews in Economic Geology, Vol. 13, 2000, pp. 245-277.

[11] MacLean, W.H., “Mass change calculations in altered rock series”, Mineralium Deposita Vol. 25, 1990, pp. 44-49.

[12] Aiuppa, A., Allard, P., D., Alessandro, W., Michel, A., Parello, F., Treuil, M., valeza, M., “Mobility and fluxes of major elements, minor and trace metals during basalt weathering and groundwater transport at Mt. Enta volcano (sicily”, Geochimica et Cosmochimica Acta Vol. 64(11), 2000, pp. 1827-1841

[13] Terakado, Y., Fujitani, T., “Behaviour of the rare earth elements and other trace elements during interactions between acidic hydrothermal solutions and silicic volcanic rocks”, southweastern Japan, Geochimica et Cosmochimica Acta, Vol. 62(11), 1998, pp. 1903-1917.

[14] Gresens, R.L., “Composition- volume relationships of metasomatism”, Chemical Geology, Vol. 2, 1967, pp.47-55.

[15] Grant, J.A., “The isocon diagram- a simple solution to Gresens equation for metasomatic”, Economic Geology Vol. 81, 1986, pp.1976-1982.

[16] MacLean, W.H., Kranidiotis, P., “Immobile elements as monitors of mass transfer in hydrothermal alteration: Phelps Dodge massive sulfide deposit, Matagami, Quebec”, Economic Geology Vol. 82, 1987,pp. 951-962.

[17] Nesbitt, H.W., Markovics, G., “Weathering of granodioritic crust, long- term storage of elements in weathering profiles and petrogenesis of siliciclastic sediments”, Geochimica et Cosmochimica Acta, Vol. 61, 1997, pp. 1653-1670.

[18] Fulignati, P., Gioncad, A., Sbrana, A., “Rare earth element (REE) behaviour in the alteration facies of the active magmatic- hydrothermal system of volcano (Aeolian Islands, Italy)”, Journal of Volcanology and Geothermal Research, Vol. 88, 1999, pp. 325-342.

[19] Kirschbaum, A., Martinez, E., Pettinari, G., Herrero, S., “Weathering profiles in granites, Sierra Norte (Cordoba, Argentina)”, Journal of south American Earth Sciences, Vol. 19, 2005, pp. 479-493.

[20] Bache, W., Peucker-Ehrenbrink, B., Hart, S.R., Blusztajn, J.S.,. “Geochemistry of hydrothermally altered oceanic crust: DSDP/ODP Hole 504B- Implications for seawater-crust exchange budgets and Sr- and Pb isotopic evolution of the mantle”, Geochem. Geophys. Geosys., Vol. 4(3), 2003. 8904. doi: 10.1029/2002GC000419.

[21] Nesbitt, H.W., Young, G.M., “Early proterozoic climates and plate motions inferred from major element chemistry of lutites, Nature”, Vol. 279, 1982, pp. 715-717.

[22] Fedo, C.M., Nesbitt., H.W., Young, G.M.,. “Unraveling the effects of potassium metasomatism in sedimentary rocks and paleosols, With implications for paleoweathering conditions and provenance”, Geology 23, 1995, 921-924.

[23] Voicu, G., Bardoux, M., Jebrak, M., “Normative Mineralogical calculations for tropical weathwring profiles”, Winnipeg 96, Ann. Meet., Geol. Asso. Can. Mineral. Assoc. Can. Prog., Vol. 21, 1996, A-69.

[24] Barnes, H.L., “Geochemistry of hydrothermal ore deposits”, John Wiley-Interscience publication, 3nd edition, 1997, 963p.