Mineralogy and genesis of the Mishdovan refractory ore bodies Bafgh, Central Iran

Abstract

Bafgh Mishdovan ore body is located in the Central Iranian zone and is recognized as potential of the sillimanite group minerals. In this region, the outcrops of the different formations can be observed which mainly consist of the Precambrian metamorphic rocks. Silimanite group minerals are existed in the schistic rocks. The area is located in a tectonized zone and subjected to regional metamorphism then intruded by igneous plutonic rocks. The study area has 95 km2 coverage and according to quality and grade of sillimanite group minerals can be divided to four different mineral zones. Primary exploration activities have been carried out by digging of the trenches and test pits. Samples were taken systematically from outcrops, trenches and test pits. In order to recognize of the ore body (via mineralogy studies), some samples were sent to the laboratory for thin section studies and also XRD and XRF analysis. Based on these investigations, it is verified that the refractory minerals are consisted of sillimanite and kyanite and rarely andalusite. Based on the hosted rocks type and their metamorphic stages, thin section studies and XRD analysis, the phase transition of the primary andalusite into sillimanite and kyanite due to the high temperature-contact metamorphism can be justified. Also regarding the XRD analysis, only one sample contains some kyanites, so it seems that ore bodies is low grade and beneficiation of this industrial  minerals face many difficulties or may not be feasible.  

Keywords


[1] Bates R.L., Jackson J. A., "Glossary of geology", American Geological Institute, (1980).

‌[2] Ghassemi Kakroudi M., Huger M., Gault C., Chotard T., "Anisotropic behaviour of andalusite particles used as aggregates on refractory castables", Journal of the European Ceramic Society 29 (2009) 571–579.

‌[3] Schneider H., Schreuer J., Hildmann B., "Structure and properties of mullite- A review", Journal of the European Ceramic Society 28 (2008) 329–344.

‌[4] Mazel F., Gonon M., Fantozzi G., "Manufacture of mullite substrates from andalusite for the development of thin film solar cells", Journal of the European Ceramic Society 22 (2002) 453–461.

‌[5] Kulkarni T., Wang H.Z., Basu S.N., Sarin V.K., "Phase transformations in mullite-based nanocomposites", Int. Journal of Refractory Metals & Hard Materials 27 (2009) 465–471.

[6] شرکت تهیه و تولید مواد اولیه فولاد ایران، "اکتشاف مقدماتی ذخایر آندالوزیت میشدوان بافق"، 1377.

[7] مهندسان مشاور معدنکاو، "گزارش نهایی اکتشاف نیمه تفصیلی آندالوزیت میشدوان بافق"، سازمان صنایع و معادن استان یزد، (1379).

‌[8] Ildefonse J. P., "Mullitizatin of andalusite in refractory bricks, Key engineering materials", Vols. B2-136, pp. 1798-1801, (1997).

[9] کوهساری ا. ح.، دهقانی م.، "مطالعات زمین‌شناسی و کانی‌شناسی و پتانسیل یابی ذخایر دیرگداز شمال بافق"، طرح پژوهشی، دانشگاه یزد، (1387).

‌[10] سازمان زمین شناسی کشور، "نقشه زمین شناسی 250000 : 1 چهارگوش یزد"، (1354) .

[11] نمیرانیان ا.، مجتهدزاده س. ح.، کلانتر م.، دهقانی ع.، "شناسایی کانی‌های مختلف کانسار آندالوزیت میشدوان بافق با روش مطالعه مقاطع نازک، XRD و XRF"، مجموعه مقالات پانزدهمین همایش انجمن بلورشناسی و کانی‌شناسی ایران، (1386).

‌[12] کریم پور م. ح.، "کانی‌ها و سنگ‌های صنعتی"، انتشارات جاوید مشهد، (1384).

[13] کریم پور م. ح.، "زمین‌شناسی اقتصادی کاربردی"، انتشارات جاوید مشهد، (1385).