Articles | Volume 12, issue 5
https://doi.org/10.5194/se-12-1125-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-12-1125-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
19 May 2021
Research article |
| 19 May 2021
| 19 May 2021
Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, Italy
Department of Earth and Environmental Sciences, Lehigh University,
Bethlehem, PA 18015, USA
Frank J. Pazzaglia
Department of Earth and Environmental Sciences, Lehigh University,
Bethlehem, PA 18015, USA
Josep M. Parés
Geochronology, Centro Nacional de Investigación de la
Evolución Humana (CENIEH) Burgos, Burgos, 09002, Spain
Kenneth P. Kodama
Department of Earth and Environmental Sciences, Lehigh University,
Bethlehem, PA 18015, USA
Claudio Berti
Idaho Geological Survey, Moscow, ID 83844, USA
James A. Fisher
Department of Earth and Environmental Sciences, Lehigh University,
Bethlehem, PA 18015, USA
Alessandro Montanari
Osservatorio Geologico di Coldigioco, Apiro, Macerata, 62021, Italy
Lorraine K. Carnes
Geological Sciences, Arizona State University, Tempe, AZ 85281, USA
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At the St. Johns Dome, Arizona, CO2 naturally occurs in the subsurface, but there are travertine rocks on the surface which are an expression of CO2 leakage to the surface. These travertine deposits occur along faults, zones where the rock layers are fractured and displaced. In our research, we use geomechanical analysis to show that the CO2 leakage occurs at points where the faults are likely to be permeable due to the orientation of the geological stress field in the subsurface.
Irène Aubert, Philippe Léonide, Juliette Lamarche, and Roland Salardon
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In carbonate rocks, fault zones influence the fluid flows and lead to important diagenetic processes modifying reservoir properties. The aim of this study is to identify the impact of two polyphase fault zones on fluid flows and reservoir properties during basin history. We determined petro-physic and diagenetic properties on 92 samples. This study highlights that fault zones acted as drains at their onset and induced fault zone cementation, which has strongly altered local reservoir properties.
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When carbon dioxide is introduced into the subsurface it will migrate upwards and can encounter faults, which, depending on their hydrogeological properties and composition, can form barriers or pathways for the migrating fluid. We analyse uncertainties associated with these properties in order to better understand the implications for the retention of CO2 in the subsurface. We show that faults that form seals for other fluids may not be seals for CO2, which has implications for storage sites.
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Physical properties of layered sedimentary rocks affect nucleation and propagation of discontinuities therein. Fractures developing through sedimentary sequences characterized by the alternation of strong and weak layers are strongly deviated along their track at layers’ boundaries, and depending on the layer they cross-cut, they show very thick (strong layers) or very thin (weak layers) infills of precipitated minerals, potentially representing pathways for ore deposits and oil/water resources.
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Short summary
The anisotropy of magnetic susceptibility (AMS) technique provides an effective way to interpret deforming mountain belts. In both the Betics, Spain, and Apennines, Italy, weak but well-organized AMS fabrics were recovered from young unconsolidated and unburied rocks that could not be analyzed with more traditional methods. Collectively, these studies demonstrate the novel ways that AMS can be combined with other data to resolve earthquake hazards in space and time.
The anisotropy of magnetic susceptibility (AMS) technique provides an effective way to interpret...
