Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8908750 | Tectonophysics | 2018 | 19 Pages |
Abstract
The Kachchh Mainland Fault (KMF) is a major E-W trending fault in the Kachchh region of Gujarat extending >150â¯km from Lakhpat village in the west to the Bhachau town in the east. The Katrol Hill Fault (KHF) is an E-W trending intrabasinal fault located in the central region of Kachchh Basin and the south of KMF. The western parts of both of the faults are characterized, and the sediment thickness has been estimated in the region using a Magnetotelluric (MT) survey at 17 sites along a 55â¯km long north-south profile with a site spacing of 2-3â¯km. The analysis reveals that the maximum sediment thickness is 2.3â¯km (Quaternary, Tertiary, and Mesozoic) in the region, out of which, the Mesozoic sediments feature a maximum thickness of 2â¯km. The estimated sediment thickness is found consistent with the thickness suggested by a deep borehole (depth approx. 2.5â¯km) drilled by Oil and Natural Gas Corporation (ONGC) at Nirona (Northern part of the study area). From 2-D inversion of the MT data, three conductive zones are identified from north to south. The first conductive zone is dipping nearly vertical down to 7-8â¯km depth. It becomes north-dipping below 8â¯km depth and is inferred as KMF. The second conductive zone is found steeply dipping into the southern limbs near Manjal village (28â¯km south of Nirona), which is inferred as the KHF. A vertical-dipping (down to 20â¯km depth) conductive zone has also been observed near Ulat village, located 16â¯km north of Manjal village and 12â¯km south of Nirona village. This conductive zone becomes listric north-dipping beyond 20â¯km depth. It is reported first time by a Geophysical survey in the region.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
Kapil Mohan, Peush Chaudhary, Pruthul Patel, B.S. Chaudhary, Sumer Chopra,