Mineralization and geochemical studies in the Kalchouyeh occurrence, southwest of Naein

زمین شناسی اقتصادی

Article 3, Volume 4, Issue 2 - Serial Number 7, December 2012, Pages 241-256   

Document Type: Research Article

DOI: 10.22067/econg.v4i2.16494

Authors

Hengameh Hosseini Dinani^* ; Hashem Bagheri; Reza Shamsipour Dehkordi

Isfahan

Abstract

Kalchouyeh area in southwest of Naein is located in the Urumieh-Dokhtar volcano-plutonic belt. Mineralization occurred mainly as disseminations and veinlets hosted by trachy-andesite and pyroxene andesites. For mineralogy, alteration, fluid inclusion and geochemical studies, the two major mineralized zones: A (larger vein) from the north-northwest and B (smaller vein) from the east-southeast of the area were sampled. Alteration studies revealed that the main alteration assemblages are silicification and propylitic. The ore minerals are chalcopyrite, galena, pyrite, bornite, chalcocite, covellite, goethite, malachite, azurite, cerussite and cuprite with quartz, calcite and barite as the main gangues. Fluid inclusion studies demonstrated that salinity and homogenization temperatures were 0.38-4.23 and 0.166-9.188 wt% NaCl and 175-252°C and 250-324°C at the A and B veins, respectively. Rare Earth Element (REE) plots show negative slopes that is one of the features for calc-alkaline magmas. La/Y is higher than 1 showing that mineralizing fluids were neutral to basic. According to the data, direction of ore-bearing fluids movement was determined to be from east-southeast toward north-northwest (from B to A veins(, approximate site of mineralization center is located adjacent to smaller vein and the mineralization is epithermal in type.

Keywords

Kalchouyeh; minerallography; fluid inclusions; Geochemistry; Epithermal

References

[1] مجله رشد زمین شناسی، "کانسارهای مس"، سازمان پژوهش و برنامه‌ریزی آموزشی (1389).

[2] وهابی‌مقدم ب.، "مطالعه پتروگرافی و پترولوژی سنگهای ماگمایی– دگرگونه جنوب نایین"، پایان‌نامه کارشناسی ارشد، دانشگاه تربیت معلم تهران (1372) 145 ص.

[3] امینی ب.، امینی چهرق م.، "نقشه زمین شناسی 100000/1 کجان"، سازمان زمین شناسی و اکتشافات معدنی کشور (1382) برگه شماره 6555.

[4] Cox K. G., Bell J. D., Pankhurst R. G., "The interpretation of Igneous rocks", London, Allen and Unwin (1979) 450 .

[5] Barnes H. L.,"Geochemistry of hydrothermal ore deposits", John Wiley and Sons Interscience, (1997) 972 .

[6] Craig J. R., Vaughan D. J., "Ore microscopy and ore petrography", Canada (1994) 434 pp.

[7] Alfons m., Ulrich F., "Fluid inclusion petrography", Jornal of Lithos 55 (2001) 27-47.

[8] Shepherd T., Rankin A. H., Alderton D. H. M., "A practical guide to fluid inclusion studies", Blackei, USA chapman and hall New York (1985) 345.

[9] حسنی پاک ع. ا.، "اکتشافات ذخایر طلا"، انتشارات دانشگاه تهران (1381) 742 ص.

[10] Pirajno F., "Hydrothermal processes and mineral systems", springer sicence, perth (2009) 203.

[11] Boyton W. V., "Geochemistry of the Rare Earth Elements: Meteorites studies". In Henderson, P., Rare Earth Element geochemistry, Elsevier (1984) 63-114.

[12] Sun S. S., McDonough W. F., "Chemical and isotopic systematic of oceanic basalts: Implications for mantle composition and processes", Geol. Soc. Lon., Spec. pub. 42 (1989) 313 – 345.

[13] Kesler S. E., "Metallogenic evolution of convergent margin: Selected ore deposite models", Ore Geol. 12 (1997) 153 -171.

[14] Wenlandt R. F., Harison W. G., "Rare Earth Partitioning between immiscible carbonate and Rare Earth enriched rocks", Corti 6, Mineral Petrology 69 (1979) 409 – 419.

[15] Puchlet H., Emmermann R., "Bearing of Rare Earth Patterns of appetites from Igneous and Metamorphic rocks", Earth Planet. Sci. Lett, 31 (1976) 279-286.

[16] Henderson P., "Rare Earth Element Geochemistry", Elsevier (1984) 510 .

[17] Robb L. J., "Introduction to ore-forming processes", Blackwell science, Victoria (2005) 373.

[18] Foster R. P., "Gold Metallogeny and Exploration", Department of Geology University of Southampton (1996) 432.

[19] شهاب پور ج.، "زمین شناسی اقتصادی"، انتشارات دانشگاه شهید باهنر کرمان (1386) 543 ص.

[20] Sillitoe R. H., "Epithermal models: Genetic types, geometrical control and shallow features", Geological Association of Canada Special paper 40 (1993) 403 – 417.

[21] Camprubi A., Albinson T., "Epithermal deposites in Mexico, Update of current knowledge and an empirical reclassification", The Geologcal Society of America (2007) 422, 14-39.

[22] مهوری ر.، "مطالعات پترولوژیکی و کانی‌شناسی دگرسانیهای گرمابی در گردنه ملااحمد"، پایان‌نامه کارشناسی ارشد، دانشگاه اصفهان (1388) 310 ص.