Diatom biostratigraphy, Argon ages and chronology of ODP Hole 183-1138A ...

• Main Authors: Bohaty, Steven M, Wise, Sherwood W, Duncan, Robert A, Moore, Leah, Wallace, Paul J
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2003
• Subjects: Drilling/drill rig; Leg183; Joides Resolution; Ocean Drilling Program ODP; Heard Island; Southern Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.785348; https://doi.pangaea.de/10.1594/PANGAEA.785348

A thick Neogene section was recovered in the upper ~300 m of Ocean Drilling Program Hole 1138A, drilled on the Central Kerguelen Plateau in the Indian sector of the Southern Ocean. Sediment lithologies consist primarily of mixed carbonate and biosiliceous clays and oozes, with several thin (1-3 cm) tephra horizons. The tephras are glass rich, well sorted, and dominantly trachytic to rhyolitic in composition. Volcaniclastic material in these horizons is interpreted to have originated from Heard Island, 180 km northwest of Site 1138, and was likely emplaced through both primary ash fall and turbiditic, submarine flows.A Neogene age-depth model for Hole 1138A is constructed primarily from 36 diatom biostratigraphic datums. Nannofossil and planktonic foraminifer biostratigraphy provides supporting age information. Additionally, four high-precision 40Ar-39Ar ages are derived from ash and tephra horizons, and these radiometric ages are in close agreement with the biostratigraphic ages. The integrated age-depth ... : Supplement to: Bohaty, Steven M; Wise, Sherwood W; Duncan, Robert A; Moore, Leah; Wallace, Paul J (2003): Neogene diatom biostratigraphy, tephra stratigraphy, and chronology of ODP Hole 1138A, Kerguelen Plateau. In: Frey, FA; Coffin, MF; Wallace, PJ; Quilty, PG (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 183, 1-53 ...