Structural Implications and Mineralization of Iron Ore around Pur-Banera, District Bhilwara, Rajasthan (India)
|International Journal of Geoinformatics and Geological Science|
|© 2020 by SSRG - IJGGS Journal|
|Volume 7 Issue 3|
|Year of Publication : 2020|
|Authors : Pooja Sharma, Arun Kumar Shandilya, Neeraj Srivastave|
How to Cite?
Pooja Sharma, Arun Kumar Shandilya, Neeraj Srivastave, "Structural Implications and Mineralization of Iron Ore around Pur-Banera, District Bhilwara, Rajasthan (India)," SSRG International Journal of Geoinformatics and Geological Science, vol. 7, no. 3, pp. 1-12, 2020. Crossref, https://doi.org/10.14445/23939206/IJGGS-V7I3P101
The Pur-Banera Belt, located in the Bhilwara District (Rajasthan), is one of the most prominent iron ore deposits that form a part of the Bhilwara Supergroup. The Belt is trending in NE-SW direction. The major litho-units of the area are Conglomerate, Garnetiferous Mica-schist, Calc-schist, Amphibolite, Calc-gneiss, Calc-silicate marble, Banded Iron Formation [includes Banded Hematite Quartzite (BHQ), Banded Magnetite Quartzite (BMQ)], and Carbonate Rocks with associated sulfide mineralization.
The structural relationships of the Pur-Banera supracrustal rocks, (i.e quartzo-feldspathic gneisses, banded iron formation, carbonates, amphibolite,
garnetiferous mica schist,) are associated with rare mafic and granitic intrusions, but with several generations of granite pegmatites. Strike of the rocks varies from N250E-S250W to N550E-S550W and dip varies from 650 to 800 towards the SE. The bedding plane (S0), is prominent in the iron formation and calc gneiss therefore it is defined by compositional banding. Foliation plane (S1) is prominent in garnetiferous micaschist and calc-schist within the study area.
Asymmetrical S, M and Z type of drag folding, which is present in outcrops of Bedded Iron Formation (BIF), forming a Syncline Structure, especially in Tiranga Formation where the average thickness of the hematite and magnetite quartzite zone has been observed to be between 3 m to 10 m, but apparent thickness of the zone goes up to 60 m at the three peaks, due to repeated drag folding of the individual hematite & magnetite quartzite band at the synclinal closure. However, they are highly jointed and fractured also. Moreover in other blocks, thickness of the ore zone varies from 10m to 40m.
The Pur-Banera Belt is mostly composed of meta-sedimentary, metamorphosed dolomite, and small number of igneous rocks. However, iron ore deposit was originally a sedimentary exhalative deposit before experiencing a metamorphic event. On the basis of geology, structures, mineralization textures, and field assignments author shows that, the banded iron ore occurs with quartzite and other meta-sedimentary sequences that indicate metamorphism took place after the completion of sedimentary rock.
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