بررسی کانه‌زایی و ژئوشیمی کانسار آهن ده‌زمان، (جنوب غرب بردسکن) و مقایسه‌ی آن با کانسارهای آهن نواری

Dehzaman iron deposit is located in southwest of Bardaskan, Khorasan Razavi Province. The area is situated in northeastern Posteh-Badam block based on structural map of Iran. In the deposit, hematite band with 1.5 km long, 6 meters thickness­ and east-west trending is located within Pre-Cambrian metamorphozed sedimentary rocks as conform. Field evidences such as consolidated hematite, present of hematite thin bands alternative with metamorphosed sedimentary units, lack­ of­ alteration, association­ of hematite with muscovite crystals, and present of exotic rocks and fragments show that this deposit is formed by percipitation of iron supergene in sea environment under sedimentary processes. In addition, geochemical  studies by elecrton micr. probe method on the hematite ore deposit and comparison of Ca, Al, Mn, Ti and V  elements, and major oxides between Dehzaman iron deposit and banded iron formation indicate that they are similar. Depletion of Si in Dehzaman iron samples, which is consistent with the field observations of the rare chert layers, can be related to iron percipitation within shore environment and away from source.