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Crustal structure of the Mid Black Sea High from wide-angle seismic data

Crustal structure of the Mid Black Sea High from wide-angle seismic data
Crustal structure of the Mid Black Sea High from wide-angle seismic data
The Mid Black Sea High comprises two en echelon basement ridges, the Archangelsky and Andrusov ridges, that separate the western and eastern Black Sea basins. The sediment cover above these ridges has been characterized by extensive seismic reflection data, but the crustal structure beneath is poorly known. We present results from a densely sampled wide-angle seismic profile, coincident with a pre-existing seismic reflection profile, which elucidates the crustal structure. We show that the basement ridges are covered by approximately 1–2 km of pre-rift sedimentary rocks. The Archangelsky Ridge has higher pre-rift sedimentary velocities and higher velocities at the top of basement (c. 6 km s−1). The Andrusov Ridge has lower pre-rift sedimentary velocities and velocities less than 5 km s−1 at the top of the basement. Both ridges are underlain by approximately 20-km-thick crust with velocities reaching around 7.2 km s−1 at their base, interpreted as thinned continental crust. These high velocities are consistent with the geology of the Pontides, which is formed of accreted island arcs, oceanic plateaux and accretionary complexes. The crustal thickness implies crustal thinning factors of approximately 1.5–2. The differences between the ridges reflect different sedimentary and tectonic histories.
0305-8719
SP464.6
Shillington, D. J.
2f126bf1-76b6-4a51-aefd-81a680c4476b
Minshull, T. A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Edwards, R. A.
e733909a-1bd5-4302-ad8d-61e811b9d8fe
White, N.
97ffe311-b3d0-4156-bc9a-2ec4293bdc6e
Shillington, D. J.
2f126bf1-76b6-4a51-aefd-81a680c4476b
Minshull, T. A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Edwards, R. A.
e733909a-1bd5-4302-ad8d-61e811b9d8fe
White, N.
97ffe311-b3d0-4156-bc9a-2ec4293bdc6e

Shillington, D. J., Minshull, T. A., Edwards, R. A. and White, N. (2017) Crustal structure of the Mid Black Sea High from wide-angle seismic data. Geological Society London Special Publications, 464, SP464.6. (doi:10.1144/SP464.6).

Record type: Article

Abstract

The Mid Black Sea High comprises two en echelon basement ridges, the Archangelsky and Andrusov ridges, that separate the western and eastern Black Sea basins. The sediment cover above these ridges has been characterized by extensive seismic reflection data, but the crustal structure beneath is poorly known. We present results from a densely sampled wide-angle seismic profile, coincident with a pre-existing seismic reflection profile, which elucidates the crustal structure. We show that the basement ridges are covered by approximately 1–2 km of pre-rift sedimentary rocks. The Archangelsky Ridge has higher pre-rift sedimentary velocities and higher velocities at the top of basement (c. 6 km s−1). The Andrusov Ridge has lower pre-rift sedimentary velocities and velocities less than 5 km s−1 at the top of the basement. Both ridges are underlain by approximately 20-km-thick crust with velocities reaching around 7.2 km s−1 at their base, interpreted as thinned continental crust. These high velocities are consistent with the geology of the Pontides, which is formed of accreted island arcs, oceanic plateaux and accretionary complexes. The crustal thickness implies crustal thinning factors of approximately 1.5–2. The differences between the ridges reflect different sedimentary and tectonic histories.

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shillington_et_al_gsl_2018 - Accepted Manuscript
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e-pub ahead of print date: 4 October 2017

Identifiers

Local EPrints ID: 420944
URI: http://eprints.soton.ac.uk/id/eprint/420944
ISSN: 0305-8719
PURE UUID: 0eed702b-c9b1-49d6-bb46-a9fde4f49c5e
ORCID for T. A. Minshull: ORCID iD orcid.org/0000-0002-8202-1379

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Date deposited: 18 May 2018 16:30
Last modified: 17 Dec 2019 05:26

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