Biogenic silica in ODP Hole 105-647A, supplement to: Bohrmann, Gerhard; Stein, Ruediger (1989): Biogenic silica at ODP Site 647 in the southern Labrador Sea: occurrence, diagenesis, and paleoceanographic implications. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 155-170

Gerhard Bohrmann & Ruediger Stein
Eocene to Holocene sediments from Ocean Drilling Program (ODP) Site 647 (Leg 105) in the southern Labrador Sea, approximately 200 km south of the Gloria Drift deposits, were investigated for their biogenic silica composition. Three sections of different diagenetic alteration products of primary siliceous components could be distinguished: (1) opal-A was recorded in the Miocene and the early Oligocene time intervals with strongly corroded siliceous skeletons in the Miocene and mostly well preserved biogenic opal...
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