Clast petrography and stratigraphy in Late Quaternary sediments in the southwestern Barents Sea
pp. 95-110

Twelve gravity cores have been Iithologically investigated. The sediments are of glacigenic and marine origin. Clasts from the glacigenic sediments are classified into 18 different crystalline and sedimentary groups. The study area can be divided into five petrographic provinces, the provenances of which are crystalline basement and sedimentary shelf rocks. The core sequences were divided into four regional (6, 3, 2 and l) and two local (5 and 4) Iithostratigraphic units. The oldest unit (6), a lill, is dominated by crystalline clasts in the western area and by sedimentary clasts in the central and northern areas; the eastern area is very mixed. The petrography of the till indicates the existence of a Late Weichselian Barents Sea lee Sheet in contact with the Fennoscandian lee Sheet. Unit 5, a debris flow, and unit 4, a glaciomarine sediment, were deposited in the early phase of the deglaciation. Unit 3, a larninated glaciomarine sediment, and unit 2, a homogeneous bioturbated glaciomarine sediment, were deposited from the time of deglaciation untill2 ka, and from 12 to lO ka, respectively. Close to the coast crystalline clasts dorninate, whereas the amount of sedimentary clasts increases offshore and stratigraphically upwards. Unit l was deposited in the Holocene and contains three different textural sediment types with relatively high carbonate content