(Table T1) Lithology, structure and significant components of sediments from ODP Holes 173-1068A and 173-1069A

• Main Author: Wallrabe-Adams, Hans-Joachim
• Format: Dataset
• Language: English
• Published: PANGAEA 2001
• Subjects: 173-1068A; 173-1069A; DEPTH; sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Elevation of event; Epoch; Event label; Glauconite; Joides Resolution; Latitude of event; Leg173; Lithology/composition/facies; Longitude of event; Minerals; North Atlantic Ocean; Ocean Drilling Program; ODP; Sample code/label; Sample comment; Structure; North Atlantic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.787794; https://doi.org/10.1594/PANGAEA.787794

Thin sections of samples were studied from (syn-?) postrift sediments of the Iberia Abyssal Plain (Ocean Drilling Program Leg 173, Sites 1068 and 1069). They show that, at these sites, Lower Cretaceous calcareous chalks and calcareous mass-flow deposits are overlain by sub-calcite compensation depth pelagic claystones of Late Cretaceous to early Tertiary age. At both sites, turbidites and current-controlled sequences are intercalated with pelagic claystones and show similar variations: (1) the proportion of turbidites to pelagic clay varies systematically and (2) turbidite composition changes from relatively coarse-grained and calcareous to predominantly fine-grained siliciclastic. This facies transition occurs around the Paleocene/Eocene boundary. In addition, turbidites at the Cretaceous/Tertiary and the Paleocene/Eocene boundaries contain resedimented glauconite, and, occasionally, some pyrite.