Geological mapping of the Schuppen belt of north-east India using geospatial technology

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• 作者：Tanaya Ghosh ; Surajit Basu ; Sugata Hazra
• 关键词：NFTB ; Naga fold thrust belt ; TM ; Thematic Mapper ; ETM ; Enhanced Thematic Mapper ; PCA ; principal component analysis ; A.O.C. ; Assam Oil Company ; B.O.C. ; British Oil Company ; DEM ; Digital Elevation Model ; FTB ; Fold thrust belt ; OIL ; Oil India Limited ; O.N.G.C. ; Oil and Natural Gas Corporation
• 刊名：Journal of Asian Earth Sciences
• 出版年：5 January, 2014
• 年：2014
• 卷：79
• 期：part_PA
• 页码：97-111
• 全文大小：8586 K

文摘

A revised geologic map of the Schuppen belt of northeast India has been prepared based on interpretation of digitally enhanced satellite images. The satellite image interpretation is supported by limited field work and existing geologic maps. Available geological maps of this fold thrust belt are discontinuous and multi-scaled. The authors are of multiple opinions regarding the trajectory of formation boundaries and fault contacts. Digital image processing of satellite images and limited field surveys have been used to reinterpret and modify the existing geological maps of this fold thrust belt. Optical data of Landsat Thematic Mapper, Enhanced Thematic Mapper and elevation data of ASTER have been used to prepare this revised geological map. The study area extends from Hajadisa in south to Digboi oilfield in north, bounded by Naga thrust in the west and Disang thrust in the east. PCA, Image fusion, Linear Contrast stretch, Histogram Equalization and Painted relief algorithms have been used for the delineation of major geological lineaments like lithological boundary, thrust and strike slip faults. Digital elevation maps have enabled in the discrimination between thrust contacts and lithological boundaries, with the former being located mostly in the valleys. Textural enhancements of PCA, colour composites and Painted relief algorithm have been used to discriminate between different rock types. Few geological concepts about the terrain have been revisited and modified. It is assumed that this revised map should be of practical use as this terrain promises unexploited hydrocarbon reserves.