Morphometric Analysis of Subbasins Along The Basalt-Granite Contact in The South East Deccan Volcanic Province, India
Year: 2026
Type: article
Abstract: Morphometric analysis of drainage basins using remote sensing (RS) and GIS is an effective way to assess the influence of lithology and tectonics. In this paper, the authors evaluated lithostructural controls on the sub-basins along the contact between basalt and granite in the South East Deccan Volcanic Province (SEDVP) and the Eastern Dharwar Craton (EDC) margin. Thirty-six drainage sub-basins (mini- to micro-watersheds) located in basalt, granite, and along the basalt-granite contact were selected to assess the influence of lithology and structures (lineament, faults, etc.) on drainage morphology. Geological fieldwork was carried out along the basalt-granite contact within the 62 km stretch from Adampur, Biloli (MH), to Bhainsa (TS). Eleven profiles of basalt-granite contacts were reported, which are further referred to classify the sub-basins based on lithology, namely, Category I: sub-basins that are located in basalt, Category II: sub-basins partially located in basalt (Deccan traps) and granite (basement), and Category III: sub-basins that are located in granite. In morphometric analysis, we have calculated drainage density (Dd), stream frequency (Fs), elongation ratio (Re), and asymmetry factors (Af). The assessment of morphometric analysis and reported structures suggests that the (1) category I sub-basins are tectonically inactive, whereas category II and III sub-basins are tectonically moderately active. (2) Reported evidence of sub-surface tectonic activity expressed as ‘minor faults’ within the basement granite underlying the thin capping of basalt/basaltic soil is profoundly manifested in the sub-basins, which are corroborated by morphotectonic evidence.
DOI: 10.14419/hm2j5z48
Language: English
Subfield: Environmental Engineering
Field: Environmental Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W7125596709