The potential sources of Bauxite in PirMishi Tash, Semnan province, northern Iran

Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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JR_IJMGE-57-1_001

تاریخ نمایه سازی: 16 فروردین 1402

Abstract:

The Tash bauxite mine is located approximately ۶ km northeast of Tash village and ۴۰ km northwest of Shahroud city in Semnan Province with coordinates of ۳۶° ۳۲′ N to ۳۶° ۳۷′ N and ۵۴° ۴۱′ E to ۵۴° ۴۸′ E. The actions of the orogenic phase of the former Cimmerian as well as the chemical and physical factors have caused the erosion of the basalts in the Shemshak sedimentary basin, which has resulted in the simultaneous deposition of the Shemshak molasses and bauxite in the Tash area. According to some geological evidence and the location of Elias rule, bauxites in the vicinity of Shemshak Formation shales, it is concluded that the clay minerals have played an important role in forming the bauxite deposits in this area. The results showed that the basalts were formed from the alkaline magma and then altered to clay minerals. The remaining immobile elements such as aluminum and residual iron formed the Tash bauxite deposit. The investigation of thin sections designates that the studied ore contains ooidal, plitomorphic, allogeneic pizolite, coloform, and compressive dissolution texture, which indicates the autochthonous origin. Pyrite, chalcopyrite, goethite, and hematite were also recognized. The mineralogical study, performed by the X-Ray diffraction method, led to the identification of minerals of anatase, boehmite, diaspore, chamosite, kaolinite, quartz, and hematite. Analysis of ore samples by the X-Ray fluorescence method and calculation of aggregation coefficient of trace elements and geochemical indicators along with geological evidence revealed the source rock could be from the mafic type.

Authors

AliReza Ashofteh

Department of Geology, Faculty of Sciences, Urmia University, Urmia, Iran.

Dariush Esmaeily

School of Geology, College of Science, University of Tehran, Tehran, Iran.

Golnaz Jozanikohan

School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran

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