Geochemistry of ODP Site 162-907, North Atlantic ...

• Main Authors: Hyun, Sangmin, Kim, Seong-Ryul
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2011
• Subjects: Composite Core; Leg162; Joides Resolution; Ocean Drilling Program ODP; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.759427; https://doi.pangaea.de/10.1594/PANGAEA.759427

A geochemical analysis is conducted on hemipelagic sediments at ODP Leg 162, Site 907, North Atlantic. On the basis of major and minor element concentrations, the sequence is divided into five units. Geochemical data reveal that the sediments originated from two specific source areas, i.e., continental icerafted debris (IRD) and Icelandic basalt. In the upper part (lithological units I and II, 0 to 63.1 meters below sea floor (mbsf)), sediments were derived from continental IRD, whereas in the lower part, sediments (lithological units III, IV, and V, below 63.1 mbsf) comprise mixture of continental IRD and minor supply from the Icelandic basalt. The ratio of TiO2/Al2O3 to SiO2 content and the Th to Ti/Al molar ratio clearly provide a key to discriminate provenances. The change in source area is most likely related to the oceanographic and climatic evolution in the North Atlantic since the middle Miocene.Biogenic fossil-barren intervals (Units II and V) are considered as a consequence of dissolution caused by ... : Supplement to: Hyun, Sangmin; Kim, Seong-Ryul (1999): Geochemical study for provenance and paleoceanography on ODP Site 907 sediments of the North Atlantic Ocean. Geosciences Journal, 3(2), 95-106 ...