Geochemical studies of the Cretaceous-Tertiary boundary in ODP Holes 113-689B and 113-690C

• Main Authors: Michel, Helen V, Asaro, Frank, Alvarez, Walter, Alvarez, Luis W
• Format: Other/Unknown Material
• Language: English
• Published: PANGAEA 1990
• Subjects: 113-689B; 113-690C; DRILL; Drilling/drill rig; Joides Resolution; Leg113; Ocean Drilling Program; ODP; South Atlantic Ocean
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.754257; https://doi.org/10.1594/PANGAEA.754257

In a study of ODP Hole 689B no iridium (Ir) anomaly was found in Sections 1 through 6 of Core 25X or in Core 26X from the top down to section 2, 3-12 cm. The background Ir abundance averaged 11 parts per trillion (ppt) and a clay-enriched region had nearly the same average, 26 ± 12 ppt. If the Creta...