Abstract
Abstract The paper, describes the structure and tectonic environments of the tungsten mineralization at Chhendapathar, India's largest tungsten mining district. The main structural configuration of the district developed as a result of early, cross and later fold movements during the Singhbhum Orogeny (2000-850 m.y.). The early folding generated axial plane schistosity, whereas cross fold movements produced asymmetrical folds, and the later folding gave rise to a broad zone of culmination, that was the site of an intrusion-the source of tungsten-bearing solutions, responsible for the ore deposits. Ore controlling structures like shear-slips, shear-fractures and fault-fractures were primarily formed during the period of cross folding. On mineralization, they developed into vein patterns trending: (i) N70°E, (ii) N50°w, (iii) N70°w, (iv) N50°E, and (v) N10°E. Post-ore faults have dislocated the veins, sometimes rotating their strike by about 25°.
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