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The Kali Gandaki Supergroup in the southern part of the inner belt of the Lesser Himalayas, western Central Nepal, is structurally characterized by overturned folds and longitudinal normal faults. The... folds show a S-shaped pattern, when viewed from east, or a south-side-down pattern in shear sense, being opposite to the Z-shaped one in the inverted limb of the Angha Khola Recumbent-Fold in the outer belt. The supergroup exposed in the inner belt represents a normal limb of one and the same large-scale recumbent fold continued from the Angha Khola Fold Belt. The folded rocks in the inner belt are segmented by longitudinal faults into several, parallel to subparallel lengthwise blocks. The faults are nearly vertical or dip north steeply. The Bari Gad Fault bounding the inner and outer belts is the largest of them and its dip-slip separation is estimated more than 1400 m. Thereby the northern Himalayan side has been lowered down relative to the southern Mahabharat Range. The Pindi Khola Fault Zone typi6ed along the Pindi Khola, situated at 8 km north of the Bari Gad Fault, constitutes another major fault, into which the Tansen Group of late Paleozoic to probable early Miocene rocks has been introduced narrowly to discontinuously. It extends more than 20 km with a maximum width attaining 1.5 km within the surveyed area. The dip-slip separations of the boundary faults on both sides are estimated more than 500 m. Some other longitudinal faults run in parallel to subparallel with the faults cited above. This faulting and associated tectonic insetting of the younger Tansen Group along the fault have occurred after the folding of the Kali Gandaki Supergroup. The block-faulting in the inner belt is inferred to have been generated by release of strain on the rear side of the southerly driven Angha Khola Recumbent-Fold accompanying the Main Boundary Thrust. The regional lowering of the Midland and the development of topographic depression zones in the frontal part of the Midland are largely due to the downthrow of the faulted blocks and significant effect of erosion of sheared rocks resulted from subsequent strike-slip movements along the faults.続きを見る
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Mendeley出力
26_01_p081