Morphotectonic Study in a part of Indo-Burmese Ranges in Eastern Mizoram, India

Morphotectonic Study in a part of Indo-Burmese Ranges in Eastern Mizoram, India

ABSTRACT

Mizoram fold belt, situated in geologically complex Indo-Burmese Ranges, comprises of arcuate sedimentary belt. This NS trending mountain series is cut by a number of parallel to subparallel NNE-SSW, NE-SW, and NW-SE tectonic features like faults, deformed hill ranges etc. This research work was carried out in Champhai district of eastern Mizoram, near Indo-Myanmar border. In this study, a morphotectonic analysis has been performed to know the presence of active tectonics for the region. Morphotectonic parameters were calculated for 32 basins of 3rd, 4th, 5th and 6th order basins. Tuipui River had been originated near Champhai town which is supposed to be a paleo-lake. The two major rivers Tuipui and Tayo have similar entrench meander patterns which might have been controlled by some structural features. Most of the other drainage shows rectangular, trellis, oval and circular pattern along with the unique river meanders. The eastern basins of the Tuipui river mostly shows WNW highly asymmetrical (|AF|=IV) tilted basins whereas the western basins shows SE moderately asymmetrical (|AF|=III) tilted basins. The basins on the eastern part of the Tuipui water-divide shows moderate to high asymmetry and SSE tilting. Although the basins near to the origin of Tuipui River and some of the surrounding areas viz. near Champhai, Khuai Lui and five others show symmetrical to moderately symmetrical basins (range I-II). The results are also reflected by the T values. Elongated to moderately elongated basins shows many anomalous SL points which coincides with the lineaments and tectonic features in the area indicating activeness of the region. Macro and micro lineament plots indicate different trends in local stage although most of them follow the regional NW trends which are quite opposite to the NNE stress component. The results indicate that this part of IBA is associated with active tectonics as confirmed by the morphotectonic studies.

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