STRUCTURAL CONTROL ON DRAINAGE PATTERN OF UPPER-MIDDLE PAHUJ RIVER BASIN AND IMPLICATION OF REMOTE SENSING IN WATERSHED MANAGEMENT, BUNDELKHAND CRATON, CENTRAL INDIA.
In the present paper a detail analysis of drainage pattern and Lineaments of upper-middle Pahuj River basin (Bundelkhamd craton) in central India has been attempted and the relationship between drainage patterns and major structures is established. Individual watershed is a constituent of Pahuj river system and is characterised by dendritic to subdendritic pattern. I to V order drainage patterns are identified in each minor river basin. The I order streams invariably trend in NW-SE to E-W directions. The NE- SW trends are displayed by II order streams. The III and IV order streams are variably trend in NE-SW to N-S and NNW- SSE directions respectively. The major and minor lineaments have been recognised by interpreting tone-texture of LISS- III satellite imageries. The NE-SW, NNE-SSW, NNW-SSE and NW-SE major ineament patterns are recognised in the study area. It shows that the main orientation (NE-SW) of Pahuj River is controlled by major bedrock structures of Archean to Precambrian time.
Geologically three major groups of rocks are exposed in the study area. The TTG gneisses (3.3 Ga), gneisses (3.2 Ga) with inclusions of amphibolites, migmatites and mylonitised gneisses constitute gneissic complex. The Iron Formation and volcanic units (2.56 Ga) belong to Metasedimentary and Metavolcanic complex. The porphyritic hornblende and grey granite (2.5 Ga), pink and mylonitised granite, alongwith NE-SW quartz reefs and NW-SE mafic dykes formed the granitic complex. This gneissic- granitic (Archean to Palaeoproterozoic) terrain is transected by subvertical E-W Dinara-Garhmau crustal (brittle ductile) shear zone. The major part of watershed in this region is occupied by
hard rock granitic terrain. The older metamorphic terrain and granitoids are also structurally controlled by major E-W and NE- SW structural features. This analysis infers that the high and low order streams, drainage pattern, and watershed are controlled by lithology and bed rock structures.
Upper-Middle Pahuj River basin, Drainage Pattern, Watershed, Lineaments, structural control.