The University of Southampton
University of Southampton Institutional Repository

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 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.

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 (4), 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 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.

Text
GSA_Manuscript - Accepted Manuscript
Download (6MB)
Text
GSA_DataRepository - Accepted Manuscript
Download (19MB)

More information

Accepted/In Press date: 19 December 2019
e-pub ahead of print date: 6 February 2020
Published date: 2020
Additional Information: 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. Publisher Copyright: © 2020 Geological Society of America.

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

Catalogue record

Date deposited: 05 Feb 2020 17:32
Last modified: 12 Aug 2022 04:01

Export record

Altmetrics

Contributors

Author: Vanessa Monteleone ORCID iD
Author: Hector Marín-Moreno

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×