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The AAPG/Datapages Combined Publications Database
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Abstract
Chapter from:
Chapter 12
Cretaceous Syn- to Postrift Sedimentation on the Southern Continental Margin of the Western Black Sea Basin
Naci Gorur
Istanbul Technical University (I.T.U.)
Ayazaga, Istanbul, Turkey
ABSTRACT
The synrift sediments commence locally with Aptian lagoonal black shales, rich in organic matter. They pass laterally and upward into an Albian unit, comprising marginal marine glauconitic sandstones succeeded by siliciclastic turbidites, marls, sandy limestones, and blue to black shales with abundant glauconite. This unit includes several levels of mass-flow deposits, comprising mostly conglomerates and olistoliths of various sizes, ranging from a few centimeters to hundreds of meters in diameter. The synrift sediments end with a Cenomanian succession of blue to black shales and clayey limestones, in part with exotic blocks derived from the underlying rocks.
The postrift sediments at the base of upper Cenomanian to Campanian consist of pelagic red micrites and marls followed by mainly volcanogenic (both andesitic and basaltic) terrigeneous and carbonate turbidites and deep-water sediments, ranging from Turonian to lower Eocene. The basal pelagic carbonates rest with a slightly angular unconformity on the synrift deposits and represent the breakup facies.
Facies analyses of the rift succession indicate that the Western Black Sea Basin was isolated during its synrift stage from free interchange with the
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Intra-Pontide Ocean to the south, and therefore was euxinic. During the rift-drift transition in the late Cenomanian, the euxinic conditions largely disappeared, and the water column above the arc margin of this basin became well mixed. The volcanic activity in the arc also increased in intensity soon after this transition, and largely controlled the postrift sedimentation.
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