Abstract

The major structural anomaly in the Zawar area is that, whereas the galena-sphalerite-pyrite ore deposits at Mochia Magra and Balaria follow an east-west trend, the regional structural trend is north-south. Structural elements present in the area are discussed. Contrast of folds to the north and south of the Tiri River-Harn Magra-Ruparia fault is notable. While the Zawar Mala-Shisha Magra areas are northerly plunging anticlines, the Mochia-Balaria areas lie on a westerly plunging fold. Isoclinal character of these folds are dominant. Major types of folding are (1) flexure-slip and (2) shear. The structural anomaly can be explained by assuming a cross-fold hypothesis. Probably the cross-folding took place during the Eparchaean interval, between 735 m.y. and 1500 m.y. ago, and this caused recrystallization and mobilization of the rock minerals as well as the sulfides.

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