A study of primary sedimentary structures in banded iron formations (Bifs) of nagavi area, gadag schist belt, Karnataka, India

摘要

? 2021, Books and Journals Private Ltd.. All rights reserved.Primary sedimentary structures play a vital role in mineralisation. The banded iron formations (BIF’s) are unique rock formations in geological history. The banded iron formations of Gadag schist belt, Karnataka, India, exhibit primary sedimentary structures like meso and micro folds, ripple marks, cross lamination, parting lineation and graded bedding. BIF of Nagavi area is one of the most typical Precambrian formations of the Gadag schist belt (GSB). BIF’s outcrops were delineated during field visit. Most of the outcrops were located on top of the hill and Meta-basalts on either side of the hill and trending NW-SE direction. The BIFs of Nagavi study area exhibit prominent primary sedimentary structures and a few preconsolidation deformation structural features, like folds, faults and brecciation between bands were also observed. The sedimentary structures along with petrographic observations it indicates that the BIFs associated with quartz vein in the form of silica iron oxide.