Investigation on geochemistry and genesis of Qahr-abad fluorite deposit, southeast of Saqqez, Kordestan province

زمین شناسی اقتصادی

Article 6, Volume 4, Issue 1 - Serial Number 6, June 2012, Pages 155-168   

Document Type: Research Article

DOI: 10.22067/econg.v4i1.13398

Authors

Babak Talaei^* ; Ali Abedini

Urmia

Abstract

Qahr-abad fluorite deposit is located 58 km southeast of Saqqez, in northwestern Kordestan province and in northern end of Sanandaj-Sirjan Zone. The factors such as change in physicochemical conditions of mineralization environment (pH and Eh), variation in pressure and temperature, alteration, metamorphism, oxidation of organic matters, adsorption, activity and solubility of associated anions, residual enrichment, and leaching of clay minerals have played important roles in distribution of major, trace and rare earth elements as well as development of the deposit. Further geochemical consideration using distribution of rare earth elements indicates that the bulk contents of REE in the samples are few and violet fluorites formed in early-stage mineralization along with enrichment of LREE (as a result of assimilation and replacement of wall rock) and blue and colorless fluorites in the late-stage mineralization along with enrichment of MREE and HREE (as a result of recrystallization and remobilization). The mineralization of violet fluorites in the deposit occurred in a relatively oxidizing-basic condition, while colorless to light yellow and blue to greenish blue fluorites occurred in a relatively reducing-acidic condition. Using Tb/Ca vs. Tb/La diagram, it can be deduced that fluorites are from hydrothermal types and the genetic model for the deposit is as replacement in carbonate rocks.

Keywords

Fluorite; Elemental geochemistry; distribution of elements; REE; Qahr-abad; Saqqez

References

[1] خلقی خسرقی م. ح.، "نقشه زمین شناسی چاپان (ایرانخواه) به مقیاس 1:100000"، انتشارات سازمان زمین شناسی و اکتشافات معدنی کشور، (1378).

[2] قربانی م .، "دیباچه ای بر زمین شناسی اقتصادی ایران"، انتشارات سازمان زمین شناسی و اکتشافات معدنی کشور، (1381) ٦٩٥ ص.

[3] زراسوندی ع. ر.، "اطلس دگرسانی"، انتشارات دانشگاه شهید چمران اهواز، (1386) 121ص.

[4] شیدا ب.، "گزارش طرح اکتشاف معدن فلوئوریت قهرآباد سقز"، سازمان صنایع و معادن استان کردستان، (1372) 58‌ ص.

[5] Rollinson H. R., "Using geochemical data: Evaluation, presentation, interpretation", Longman Scientific and Technical (1993) 352.

[6] Bellanca A., Di Salvo P., Möller P., Neri R., Schley F., "Rare earth and minor elements distribution and petrographic features of fluorites and associated Mesozoic limestones of northwestern Sicily", Chemical Geology 32 (1981) 255-269.

[7] Gültekin A. H., Örgün Y., Suner F., "Geology, mineralogy and fluid inclusion data of the Kizilcaören fluorite- barite-REE deposit, Eskişehir, Turkey", Journal of Asian Earth Sciences 21 (2003) 365-376.

[8] Schönenberger J., Köhler J., Markl G., "REE systematics of fluorides, calcite and siderite in peralkaline plutonic rocks from the Gardar province, south Greenland", Chemical Geology 247 (2008) 16-35.

[9] Sanchez V., Cardellach E., Corbella M., Vindel E., Martin-Crespo T., Boyce A. J., "Variability in fluid sources in the fluorite deposits from Asturias (north Spain): Further evidences from REE‌‌, radiogenic (Sr, Sm, Nd) and stable (S, C, O) isotope data", Ore Geology Reviews 37 (2010) 87-100.

[10] Bau M., Romer R. L., Lüders V., Dulski P., "Tracing element sources of hydrothermal mineral deposits: REE and Y distribution and S-Nd-Pb isotopes in fluorite from MVT deposits in the Pennine Orefield, England", Mineralium Deposita 38 (2003) 992-1008.

[11] Sizaret S., Marcoux E., Jebrak M., Touray J. C., "The Rosignol fluorite vein, Chaillac, France: Multiphase hydrothermal activity and intra-vein sedimentation", Economic Geology 99 (2004) 1107-1122.

[12] Souissi F., Souissi R., Dandurand J. L., "The Mississippi Valley-type (MVT) fluorite ore at Jebel Stah (Zaghouan District, north-eastern Tunisia): Contribution of REE and Sr isotope geochemistries to the genetic model", Ore Geology Reviews 37 (2010) 15-30.

[13] Yao H. J., Hong F. L., Shao Y. J., Wei Z. S., Hong H. F., Pei N., "Trace element and Sr-Nd isotope geochemistry of fluorite from the Xiangshan Uranium deposit, southeast China", Economic Geology 101 (2006) 1613-1622.

[14] Cherniak D. J., Zhang X. Y., Wayne N. K., Watson E. B., "Sr, Y and REE diffusion in fluorite", Chemical Geology 181 (2001) 99-111.

[15] Sallet R., Moritz R., Fontignie D., "The use of vein fluorite as probe for paleofluid REE and Sr-Nd isotope geochemistry: The Santa Catarina fluorite district, southern Brazil", Chemical Geology 223 (2005) 227-248.

[16] Schwinn G., Markl G., "REE systematic in hydrothermal fluorite", Chemical Geology 216 (2005)‌ 225-248.

[17] Sasmaz A., Yavuz F., "REE geochemistry and fluid-inclusion studies of fluorite deposits from the Yaylagözü area (Yıldızeli-Sivas) in central Turkey", Chemical Geology 183 (2007) 215-226.

[18] Taylor St. R., McLennan S. M., "The continental crust: Its composition and evolution", Blackwell Scientific Publications (1985).

[19] Möller P., Parekh P. P., Schneider H. J., "The application of Tb/Ca-Tb/La abundance ratios to problems of fluorspar genesis", Mineralium Deposita 11 (1977) 111-116.

[20] Ekambaram V., Brookins D. G., Rosenberg P. E., Emanuel K. M., "Rare earth element geochemistry of fluorite-carbonate deposits in western Montana, U.S.A", Chemical Geology 54 (1986) 319-331.

[21] Castorina F., Masi U., Padalino G., Palomba M., "Trace element and Sr-Nd isotopic evidence for the origin of the Sardinian fluorite mineralization (Italy)", Applied Geochemistry 23 (2008) 2906-2921.

[22] Bosze S., Rakovan J., "Surface structure controlled sectoral zoning of the rare earth elements in fluorite from Long Lake, New York, and Bingham, New Mexico, U.S.A", Geochimica et Cosmochimica Acta 66 (2002) 997-1009.