Mineralogy of Holocene Sediments from the Southwestern Black Sea Shelf (Turkey) in Relation to Provenance, Sea-level and
Grain size and mineral composition of core sediments were used to investigate influences of various terrestrial and marine conditions,which have prevailed on the southwestern Black Sea shelf during the Holocene.Siliciclastic mud with small amounts of sand and gravel from nearby coastal hinterland is the principal sediment type,whereas sediments deposited near the shelf edge and the (I)stanbul Strait and off the Duru Lake (a paleo-river mouth)constitued large quantities of sand and gravel of both biogenic and terrigenic origin.Variable amounts of aragonite,1 nm-micas,quartz,feldspars,calcite and dolomite constitute the dominant non-clay minerals in bulk sediments.The clay mineral assemblage in the ＜ 2 μm fraction is made up of smectite,illite,kaolinite and chlorite.Aragonite and calcite are mainly derived from benthic accumulations,whereas feldspars (mainly plagioclase) and smectite reflect magmaticvolcanic provenance and the distribution of 1 nm-micas and chlorite correlate with nearby metamorphic sources onland.Nevertheless,grain size and mineral distribution generally indicate a combination of effects of wind and wave climate,longshore and offshore cyclonic currents,changing sea-level stands and nearby source rock and morphological conditions.It is also suggested that at least part of clay minerals could be derived from the northwesterly Danube River input.
作 者： Emel BAYHAN Mustafa ERG(I)N Abidin TEMEL Seref KESK(I)N 作者单位： Emel BAYHAN,Abidin TEMEL(Faculty of Engineering,Department of Geological Engineering,Hacettepe University,Beytepe,Ankara,Turkey)Mustafa ERG(I)N(Ankara University,Geological Research Center for Fluvial,Lacustrine and Marine Environments (AGDEJAM) and Faculty of Engineering,Department of Geological Engineering,Tandogan,06100 Ankara,Turkey)
Seref KESK(I)N(Faculty of Engineering,Department of Geological Engineering,Nigde University,51100 Nigde,Turkey)
刊 名： 地质学报（英文版） SCI 英文刊名： ACTA GEOLOGICA SINICA 年，卷(期)： 2005 79(4) 分类号： P5 关键词： Black Sea shelf Holocene sediment bulk minerals clay minerals source currents transportation