The lateral strike-slip domain in gravitational detachment delta s

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• journal_title：AAPG Bulletin
• Contributor：Amélie M. Leduc ; Richard J. Davies ; Alexander L. Densmore ; Jonathan Imber
• Publisher：American Association of Petroleum Geologists (AAPG)
• Date：2012-
• Format：text/html
• Language：en
• Identifier：10.1306/09141111035
• journal_abbrev：AAPG Bulletin
• issn：0149-1423
• volume：96
• issue：4
• firstpage：709
• section：Articles

摘要

<p id="p-1">We use two- and three-dimensional seismic data to describe the structural geology of the lateral margin of a deep-water delta lobe within the Niger Delta that has undergone basinward, gravitationally driven translation. We term this region the “lateral strike-slip domain.” Deformation is characterized by a strike-slip fault system that can be followed for a distance of approximately 75 km (∼47 mi) from the shelf to the slope and toe of slope. On the northwestern side of the fault system, a fold and thrust belt that propagated north to northwest has developed within a large-scale restraining area of 460 kmp>2p> (180 mip>2p>). On the southeastern side of the strike-slip fault system, widespread extension has occurred, characterized by several graben and kilometer-scale rollover structures. Lateral margins of gravitational collapses give key information on how they deformed. We estimate a minimum horizontal displacement on the main strike-slip fault of approximately 7 km (∼4 mi). Structural and kinematic evidence, such as present-day propagating strike-slip faults, for possible future lateral expansions of the lateral strike-slip domain, is described. We expect to observe similar sets of deformation styles at the margins of other preserved gravitational collapse sliding over a detachment whose efficiency in causing downdip slip may vary laterally. p>