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Morphology and topology of dolostone lithons in the regional Carboneras Fault Zone, Southern Spain

Lookup NU author(s): Dr Obinna AbahORCiD


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Dolostones in a Neogene strike-slip fault zone are described. Two main types of structural features are recognised: (i) Background deformation in the form of a network of bedding-perpendicular and hybrid conjugate fractures, barren fractures and bedding-parallel stylolites. (ii) Fault-related features include breccias and cataclasites. Orthorhombic rock lithons are generated from the intersection of fracture sets with bedding and/or joints. Lithon size and morphology change across the dolostone fault block gradually producing a tetragonal or isometric shape. The lithons are 1–2 cm in dimension (only ~ 20% outside this range) and have an average cross-sectional aspect ratio of 1.6, irrespective of size or structural position. Topology is analysed using nodes and branches, ranging from isolated (I- node and I-I branch) to connected (Y- and X-nodes, and I-C to C-C branches) respectively. The quantitative description of the geometrical and topological analysis of the dolostone lithons suggest that they become more connected and interact within the dolostone fault blocks. Assessing the change in topology and lithons connectivity have important implications for subsurface reservoirs and aquifers hosted in dolostone-fault zones.

Publication metadata

Author(s): Igbokwe OA, Mueller M, Bertotti G, Timothy JJ, Abah O, Immenhauser A

Publication type: Article

Publication status: Published

Journal: Journal of Structural Geology

Year: 2020

Volume: 137

Print publication date: 01/08/2020

Online publication date: 30/04/2020

Acceptance date: 21/04/2020

ISSN (print): 0191-8141

ISSN (electronic): 1873-1201

Publisher: Elsevier Ltd


DOI: 10.1016/j.jsg.2020.104073


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