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Integrated geophysical characterization of crustal domains in the Eastern Black Sea

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 NW-SE transition from faulted and tilted continental blocks, to a rough and then smoother basement. We model magnetic anomalies to constrain further the various basement domains, and infer the presence of a weakly-magnetized, stretched continental crust in the NW, and a 0.4-3.8 A/m layer coinciding with the smooth basement in the central and SE area. We conclude that the EBSB oceanic crust extends further to the NW 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 thickness and velocity structure of the resulting oceanic crust.
0091-7613
405-409
Monteleone, Vanessa
8edcf456-5bfa-44cf-99b0-a504c1c2cc0d
Minshull, Timothy A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Marín-Moreno, Hector
e3eb9576-bca1-4d35-9512-e1bb88b0e4a6
Monteleone, Vanessa
8edcf456-5bfa-44cf-99b0-a504c1c2cc0d
Minshull, Timothy A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Marín-Moreno, Hector
e3eb9576-bca1-4d35-9512-e1bb88b0e4a6

Monteleone, Vanessa, Minshull, Timothy A. and Marín-Moreno, Hector (2020) Integrated geophysical characterization of crustal domains in the Eastern Black Sea. Geology, 48, 405-409. (doi:10.1130/G47056.1).

Record type: Article

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 NW-SE transition from faulted and tilted continental blocks, to a rough and then smoother basement. We model magnetic anomalies to constrain further the various basement domains, and infer the presence of a weakly-magnetized, stretched continental crust in the NW, and a 0.4-3.8 A/m layer coinciding with the smooth basement in the central and SE area. We conclude that the EBSB oceanic crust extends further to the NW 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 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

Identifiers

Local EPrints ID: 437558
URI: http://eprints.soton.ac.uk/id/eprint/437558
ISSN: 0091-7613
PURE UUID: ee1a1f8b-6e1f-4ac7-a4a6-93d48eba977a
ORCID for Vanessa Monteleone: ORCID iD orcid.org/0000-0002-5188-5879
ORCID for Timothy A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

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Date deposited: 05 Feb 2020 17:32
Last modified: 05 Feb 2021 05:01

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