Geochemical investigations of volcanic ash layers from ODP Leg 119 ...

• Main Authors: Morche, Wolfgang, Hubberten, Hans-Wolfgang, Ehrmann, Werner, Keller, Jörg
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1991
• Subjects: Drilling/drill rig; Leg119; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctic; Kerguelen Islands
• Online Access: https://dx.doi.org/10.1594/pangaea.758165; https://doi.pangaea.de/10.1594/PANGAEA.758165

Geochemical investigations were carried out on 19 discrete ash layers and on 42 dispersed ash accumulations in Oligocene to Pleistocene sediments from Sites 736, 737, 745, and 746 of ODP Leg 119 (Kerguelen Plateau in the southern Indian Ocean). The chemical data obtained from more than 500 single-grain glass analyses allow the characterization of two dominant petrographic rock series. The first consists of transitional- to alkali-basalts, the second mainly of trachytes with subordinated alkali-rhyolites and rhyolites. Chemical correlation with possible source areas indicates that the tephra layers from the northern Kerguelen Plateau Sites 736 and 737 were probably erupted from the nearby Kerguelen Islands. The investigated ash layers clearly reflect the Oligocene to recent changes in the composition of the volcanic material recorded from the Kerguelen Islands. The dispersed ashes from Sites 745 and 746 in the Australian-Antarctic Basin display almost the same range in chemical compositions as those from the ... : Supplement to: Morche, Wolfgang; Hubberten, Hans-Wolfgang; Ehrmann, Werner; Keller, Jörg (1991): Geochemical investigations of volcanic ash layers from Leg 119, Kerguelen Plateau. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 323-344 ...