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Rus detachment in Dammam Dome, Eastern Saudi Arabia: a new soft-sediment structure as a ‘sensitive stress sensor’ for the Zagros collision

Published online by Cambridge University Press:  03 December 2021

Markos D. Tranos Open the ORCID record for Markos D. Tranos [Opens in a new window]  and
Mutasim S. Osman
Markos D. Tranos*
Affiliation:
Geosciences Department, King Fahd University of Petroleum and Minerals, PO Box 5070, Dhahran 31261, Kingdom Saudi Arabia
Mutasim S. Osman
Affiliation:
Geosciences Department, King Fahd University of Petroleum and Minerals, PO Box 5070, Dhahran 31261, Kingdom Saudi Arabia
*
Author for correspondence: Markos Tranos, Email: [email protected]
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Abstract

This paper describes in detail hydroplastic structures, which are ‘odd’ kinematic indicators in the basal part of the Eocene Middle Rus Formation. Such structures were previously ignored or falsely interpreted. These hydroplastic structures are found in the massive limestone exposures on the King Fahd University of Petroleum and Minerals (KFUPM) campus. They occur in relation to a principal displacement zone along the boundary/interface between the Lower/Middle Rus, which is referred to as the Rus soft-sediment detachment. The structures are fist-sized vugs associated with carrot- or comet-trail imprints (VCT structures) which were previously translated calcite geodes that have been weathered out. VCT structures show transport/slip towards the NNW (345°) and are found on flat to low-dipping surfaces classified as Y, R and P shears with respect to the orientation of the Rus detachment. Palaeostress analysis indicates an Andersonian transtension stress regime, though it does not facilitate the activation of the Rus soft-sediment detachment. Detachment activity occurred due to the negative effective principal stress σ 3′ and the abnormally low frictional coefficient caused by fluid pressure. The soft-sediment Rus detachment can be considered a ‘sensitive stress sensor’ for the Zagros collision since it indicates the Arabian platform’s instability in the wider area of the Dammam Dome during the Late Eocene. This instability is attributed to the inception of the Zagros collision, which was previously considered to occur during the Oligocene based on the well-established pre-Neogene unconformity.

Keywords

hydroplastic structuresoft-sediment deformationdiagenesisfluid pressurepalaeostress analysisintraplate stressArabian platform
Type
FAULTS, FRACTURES AND STRESS
Information
Geological Magazine , Volume 159 , Issue 11-12: THEMATIC ISSUE: Faults and fractures in rocks: mechanics, occurrence, dating, stress history and fluid flow , November 2022 , pp. 2293 - 2305
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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Footnotes

†

present address: Department of Structural, Historical & Applied Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

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