Integrated geophysical characterization of crustal domains in the eastern Black Sea
Integrated geophysical characterization of crustal domains in the eastern Black Sea
Rifting may lead ultimately to continental breakup, but the identification and characterization of the resulting crustal distribution remains challenging. Also, spatial and temporal changes in breakup magmatism may affect the geophysical character of the newly formed oceanic crust, resulting in contrasting interpretations of crustal composition and distribution. In the Eastern Black Sea Basin (EBSB), the evolution from rifting to breakup has been long debated, with several interpretations for the distribution of stretched continental and oceanic crust. We interpret basement morphological variations from long-offset seismic reflection profiles, highlighting a northwest-to-southeast transition from faulted and tilted continental blocks to a rough and then smoother basement. We model magnetic anomalies to further constrain the various basement domains, and infer the presence of a weakly magnetized, stretched continental crust in the northwest, and a 0.4-3.8 A/m layer coinciding with the smooth basement in the central and southeastern area. We conclude that the EBSB oceanic crust extends farther to the northwest than was suggested previously from an abrupt change in crustal thickness and lower-crustal velocity. The apparent discrepancy between these different types of geophysical evidence may result from changes in magma supply during breakup, affecting the thickness and velocity structure of the resulting oceanic crust.
Monteleone, Vanessa
8edcf456-5bfa-44cf-99b0-a504c1c2cc0d
Minshull, Tim A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Marin-Moreno, Hector
e466cafd-bd5c-47a1-8522-e6938e7086a4
Monteleone, Vanessa
8edcf456-5bfa-44cf-99b0-a504c1c2cc0d
Minshull, Tim A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Marin-Moreno, Hector
e466cafd-bd5c-47a1-8522-e6938e7086a4
Monteleone, Vanessa, Minshull, Tim A. and Marin-Moreno, Hector
(2020)
Integrated geophysical characterization of crustal domains in the eastern Black Sea.
Geology, 48 (4), [405-409].
(doi:10.1130/G47056.1).
Abstract
Rifting may lead ultimately to continental breakup, but the identification and characterization of the resulting crustal distribution remains challenging. Also, spatial and temporal changes in breakup magmatism may affect the geophysical character of the newly formed oceanic crust, resulting in contrasting interpretations of crustal composition and distribution. In the Eastern Black Sea Basin (EBSB), the evolution from rifting to breakup has been long debated, with several interpretations for the distribution of stretched continental and oceanic crust. We interpret basement morphological variations from long-offset seismic reflection profiles, highlighting a northwest-to-southeast transition from faulted and tilted continental blocks to a rough and then smoother basement. We model magnetic anomalies to further constrain the various basement domains, and infer the presence of a weakly magnetized, stretched continental crust in the northwest, and a 0.4-3.8 A/m layer coinciding with the smooth basement in the central and southeastern area. We conclude that the EBSB oceanic crust extends farther to the northwest than was suggested previously from an abrupt change in crustal thickness and lower-crustal velocity. The apparent discrepancy between these different types of geophysical evidence may result from changes in magma supply during breakup, affecting the thickness and velocity structure of the resulting oceanic crust.
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Accepted/In Press date: 19 December 2019
e-pub ahead of print date: 6 February 2020
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Funding Information: we thank Sasha Brune, Tiago Alves, and two anonymous reviewers for their constructive comments that improved the paper. We thank Geology Without Limits Group (GWL, Limassol, Cyprus) for making the seismic data set available to us. We are grateful to GWL for permission to show their confidential seismic sections. Parties interested in acquiring these data and corresponding data reports can contact GWL at their website at www.gwl-geo.com. We thank Schlumberger Limited for providing the Petrel software (https://www.software.slb.com/products/petrel) that was used for seismic display, interpretation, and depth conversion. Also, we thank Geosoft Incorporated for providing the Oasis montaj software (https://www.geosoft.com/products/oasis-montaj) used for the magnetic anomaly modeling. The Earth Magnetic Anomaly Grid EMAG2v3, from which we extracted the anomaly data for the Eastern Black Sea Basin region, is available at https://www.ngdc.noaa.gov/geomag/emag2.html or https://doi.org/10.7289/V5H70CVX. Monteleone was supported by the U.K. Natural Environment Research Council Centre for Doctoral Training in Oil and Gas. Minshull was supported by a Wolfson Research Merit Award.
Funding Information: we thank Sasha Brune, Tiago Alves, and two anonymous reviewers for their constructive comments that improved the paper. We thank Geology Without Limits Group (GWL, Limassol, Cyprus) for making the seismic data set available to us. We are grateful to GWL for permission to show their confidential seismic sections. Parties interested in acquiring these data and corresponding data reports can contact GWL at their website at www.gwl-geo.com. We thank Sch-lumberger Limited for providing the Petrel software (https://www.software.slb.com/products/petrel) that was used for seismic display, interpretation, and depth conversion. Also, we thank Geosoft Incorporated for providing the Oasis montaj software (https://www.geo-soft.com/products/oasis-montaj) used for the magnetic anomaly modeling. The Earth Magnetic Anomaly Grid EMAG2v3, from which we extracted the anomaly data for the Eastern Black Sea Basin region, is available at https://www.ngdc.noaa.gov/geomag/emag2.html or https://doi.org/10.7289/V5H70CVX. Monteleone was supported by the U.K. Natural Environment Research Council Centre for Doctoral Training in Oil and Gas. Minshull was supported by a Wolfson Research Merit Award.
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Local EPrints ID: 437558
URI: http://eprints.soton.ac.uk/id/eprint/437558
ISSN: 0091-7613
PURE UUID: ee1a1f8b-6e1f-4ac7-a4a6-93d48eba977a
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Date deposited: 05 Feb 2020 17:32
Last modified: 17 Mar 2024 05:11
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Author:
Vanessa Monteleone
Author:
Hector Marin-Moreno
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