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Rift–drift transition in a magma-rich system: the Gop Rift–Laxmi Basin case study, West India

By
M. Nemčok
M. Nemčok
EGI at University of Utah, 423 Wakara Way, Suite 300, Salt Lake City, UT 84108, USAEGI Laboratory at SAV, Dúbravská cesta 9, 840 05 Bratislava, Slovakia
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S. Rybár
S. Rybár
EGI Laboratory at SAV, Dúbravská cesta 9, 840 05 Bratislava, SlovakiaDepartment of Geology and Palaeontology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
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Published:
January 01, 2017

Abstract

This paper studies the magma-rich Gop Rift–Laxmi Basin, West India, which underwent the mantle first–crust second break-up mode. It draws from reflection seismic and gravity data from this abandoned system. Seismic images document that the crustal necking was associated with the development of seawards-dipping reflector wedges deformed by landwards-dipping detachment faults. A wide crustal necking zone indicates that the ductile lower crust was still present during necking. Observed uneven detachment fault spacing indicates the effect of upper-crustal anisotropy. Comparison of the seismic images through progressively more mature stages of the rift–drift transition documents that the final stages of thinning represented the time period when the upper-crustal wide and symmetrical rift architecture changed to the asymmetrical one, and the decoupled system to the coupled one. It further indicates that the last crustal layer was broken with a convex-up fault that was associated with an excess magmatic event. The fault propagation represented the first spontaneous deformation unaffected by the pre-existing anisotropy. Subsequent drift of the two plates was associated with melt-assisted spreading and spontaneous faulting. The faulting geometry and sequence controlled which of the conjugate margins ended up with a volcanic outer high, representing the record of the break-up-locating excess magmatism.

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Contents

Geological Society, London, Special Publications

Tectonics of the Deccan Large Igneous Province

S. Mukherjee
S. Mukherjee
Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, Maharashtra, India
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A. A. Misra
A. A. Misra
Exploration, Reliance Industries Ltd, Mumbai 400 701, Maharashtra, India
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G. Calvès
G. Calvès
Université Toulouse 3, Paul Sabatier, Géosciences Environnement Toulouse, 14 avenue Edouard Belin, 31400, Toulouse, France
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M. Nemčok
M. Nemčok
EGI at University of Utah, 423 Wakara Way, Suite 300, Salt Lake City, UT 84108, USAEGI Laboratory at SAV, Dúbravskácesta 9, 840 05 Bratislava, Slovakia
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Geological Society of London
Volume
445
ISBN electronic:
9781786203281
Publication date:
January 01, 2017

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