The role of break-up localization in microcontinent separation along a strike-slip margin; the east India-Elan Bank case study

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doi: 10.1144/SP431.5
Author(s): Sinha, Sudipta Tapan; Nemcok, Michal; Choudhuri, Mainak; Sinha, Neeraj; Rao, D. Pundarika
Author Affiliation(s): Primary:
Reliance Industries, Navi Mumbai, India
Other:
University of Utah, United States
Volume Title: Transform margins; development, controls and petroleum systems
Volume Author(s): Nemcok, Michal, editor; Rybar, S.; Sinha, Sudipta Tapan; Hermeston, S. A.; Ledvenyiova, L.
Source: Transform margins; development, controls and petroleum systems, edited by Michal Nemcok, S. Rybar, Sudipta Tapan Sinha, S. A. Hermeston and L. Ledvenyiova. Special Publication - Geological Society of London, Vol.431, p.95-123. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719 CODEN: GSLSBW
Note: In English. 85 refs.; illus., incl. sects., 3 tables, sketch maps
Summary: The Elan Bank microcontinent was separated from East India during the Early Cretaceous break-up. The crustal architecture and rifting geometry of East India and the Elan Bank margins document that the early break-up between India and Antarctica was initiated in the eastern portions of the Cauvery and Krishna-Godavari rift zones, and in the southern portion of Elan Bank. However, the westwards break-up propagation along the Krishna-Godavari Rift Zone continued even after the break-up in the overstepping portion of the Cauvery Rift Zone. Eventually, the western propagating end of the Krishna-Godavari Rift Zone became hard-linked with the failed western portion of the Cauvery Rift Zone by the dextral Coromandel transfer fault zone. Consequently, the break-up location between India and Antarctica shifted from its initial to its final location along the northern portion of the Elan Bank formed by the western Krishna-Godavari Rift Zone. The competition between the two rift zones to capture continental break-up and asymmetric ridge propagation resulted in a ridge jump and the Elan Bank microcontinent release. SUPPLEMENTARY MATERIAL: Supplementary figures are available at http://www.geolsoc.org.uk/SUP18864
Year of Publication: 2016
Research Program: ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Antarctic Plate; Antarctica; Asia; Bouguer anomalies; Case studies; Cauvery Basin; Continental margin; Coromandel fault zone; Cretaceous; Crust; Data processing; Decoupling; Domains; Elan Bank; Fault zones; Faults; Geodynamics; Geometry; Geophysical methods; Geophysical profiles; Geophysical surveys; Gravity anomalies; India; Indian Ocean; Indian Peninsula; Kerguelen Plateau; Krishna-Godavari Basin; Leg 183; Lower Cretaceous; Mantle; Mantle plumes; Mesozoic; Microcontinents; Mid-ocean ridges; Models; ODP Site 1137; Ocean Drilling Program; Ocean basins; Ocean floors; Oceanic crust; Paleogeography; Plate boundaries; Plate tectonics; Reconstruction; Rift zones; Rifting; Segmentation; Seismic methods; Seismic profiles; Strike-slip faults; Surveys; Tectonic elements; Transfer faults
Coordinates: S565000 S565000 E0680536 E0680536
N100000 N150000 E0850000 E0800000
N150000 N200000 E0850000 E0800000
N150000 N200000 E0900000 E0850000
Record ID: 2017097886
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom