Complex rift geometries resulting from inheritance of pre-existing structures: Insights and regional implications from the Barmer Basin rift |
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| Institution: | 1. Basin Dynamics Research Group, Keele University, Keele, Staffordshire, ST5 5BG, England, UK;2. Cairn India Limited, 3rd Floor, Vipul Plaza, SunCity, Sector 54, Gurgaon, 122 002, India;3. Murphy Oil Corporation Limited, Level 29, Petronas Twin Towers, KLCC, 50088, Kuala Lumpur, Malaysia;1. Department of Earth & Environmental Sciences, KULeuven, Celestijnenlaan 200E, B-3001 Heverlee, Belgium;2. Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA;3. FROGTECH Ltd., 2 King Street, 2600 Deakin West, ACT, Australia;1. State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;3. Zijin Mining Group Company Limited, Xiamen 361006, China;1. Faculty of Science, Department of Earth Sciences, Kasetsart University, Bangkok, Thailand;2. Faculty of Science, Department of Geological Sciences, Chiang Mai University, Chiang Mai, Thailand;1. Department of Earth Science, University of Bergen, Allégaten 41, 5007 Bergen, Norway;2. School of Earth Atmosphere and Environmental Science, University of Manchester, Oxford Road, Manchester M13 9PL, UK;3. Museum of Natural History, University of Bergen, Allégaten 41, 5007 Bergen, Norway |
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| Abstract: | Structural studies of the Barmer Basin in Rajasthan, northwest India, demonstrate the important effect that pre-existing faults can have on the geometries of evolving fault systems at both the outcrop and basin-scale. Outcrop exposures on opposing rift margins reveal two distinct, non-coaxial extensional events. On the eastern rift margin northwest–southeast extension was accommodated on southwest- and west-striking faults that form a complex, zig-zag fault network. On the western rift margin northeast–southwest extension was accommodated on northwest-striking faults that form classical extensional geometries.Combining these outcrop studies with subsurface interpretations demonstrates that northwest–southeast extension preceded northeast–southwest extension. Structures active during the early, previously unrecognised extensional event were variably incorporated into the evolving fault systems during the second. In the study area, an inherited rift-oblique fault transferred extension from the rift margin to a mid-rift fault, rather than linking rift margin fault systems directly. The resultant rift margin accommodation structure has important implications for early sediment routing and depocentre evolution, as well as wider reaching implications for the evolution of the rift basin and West Indian Rift System. The discovery of early rifting in the Barmer Basin supports that extension along the West Indian Rift System was long-lived, multi-event, and likely resulted from far-field plate reorganisations. |
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| Keywords: | Barmer Basin Structural inheritance Non-coaxial extension West Indian Rift System |
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