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https://hdl.handle.net/2440/76634
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Type: | Journal article |
Title: | Evidence for non-Andersonian faulting above evaporites in the Nile Delta |
Author: | Tingay, M. Bentham, P. De Feyter, A. Kellner, A. |
Citation: | Geological Society Special Publication, 2012; 367(1):155-170 |
Publisher: | Geological Society Publishing House |
Issue Date: | 2012 |
ISSN: | 0305-8719 2041-4927 |
Statement of Responsibility: | Mark Tingay, Peter Bentham, Arnoud De Feyter and Axel Kellner |
Abstract: | <jats:title>Abstract</jats:title> <jats:p> This study examines present-day stress orientations from borehole breakout and drilling-induced fractures in 57 boreholes in the Nile Delta. A total of 588 breakouts and 68 drilling-induced fractures from 50 wells reveal sharply contrasting present-day maximum horizontal stress ( <jats:italic>S</jats:italic> <jats:sub>Hmax</jats:sub> ) orientations across the Nile Delta. A typical deltaic margin-parallel <jats:italic>S</jats:italic> <jats:sub>Hmax</jats:sub> exists in parts of the Nile Delta that are below or absent from evaporites (NNE–SSW in the west, east–west in the central Nile, ESE–WNW in the east). However, a largely margin-normal (NNE–SSW) <jats:italic>S</jats:italic> <jats:sub>Hmax</jats:sub> is observed in sequences underlain by evaporites in the eastern Nile Delta. The margin-normal supra-salt <jats:italic>S</jats:italic> <jats:sub>Hmax</jats:sub> orientations are often subperpendicular to the strike of nearby active extensional faults, rather than being parallel to the faults as predicted by Andersonian criteria. The high angle between <jats:italic>S</jats:italic> <jats:sub>Hmax</jats:sub> and strike of these extensional faults represents a new type of non-Andersonian faulting that is even less-suitably oriented for shear failure than previously described anomalous faulting such as low-angle normal faults and highly oblique strike-slip faults (e.g. San Andreas). While the mechanics of these non-Andersonian faults remains uncertain, it is suggested that the margin-normal supra-salt orientation generated by basal forces imparted upon rafted blocks sliding down seawards-dipping evaporites. </jats:p> |
Rights: | © The Geological Society of London 2012 |
DOI: | 10.1144/SP367.11 |
Published version: | http://dx.doi.org/10.1144/sp367.11 |
Appears in Collections: | Aurora harvest 4 Australian School of Petroleum publications |
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