Integrated Ocean Drilling Program, Expedition 302 scientific prospectus; ACEX Arctic Coring Expediton; paleoceanographic and tectonic evolution of the central Arctic Ocean

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doi: 10.2204/iodp.sp.302.2004
Author(s): Backman, Jan; Moran, Kathryn; Evans, Dan
Author Affiliation(s): Primary:
Stockholm University, Department of Geology and Geochemistry, Stockholm, Sweden
Other:
University of Rhode Island, United States
British Geological Survey, United Kingdom
Source: Scientific Prospectus (Integrated Ocean Drilling Program), Vol.302, 58p. Publisher: IODP Management International, College Station, TX, United States. ISSN: 1932-9415
Note: In English. 44 refs.
Summary: Five drill sites are proposed on the ridge crest of the Lomonosov Ridge in the central Arctic Ocean. The sites are distributed between 88°N and 81°N in water depths ranging between 800 and 1415 m, and are all located in international waters. The ridge was rifted from the Kara/Barents Sea shelves during early Paleogene time and subsequently subsided to its present water depth. Since that time, sediments of biogenic, aeolian and ice-rafted origin have accumulated on the ridge crest. In our primary target area between 87°N and 88°N these sediments are about 450 m thick, indicating an average rate of sedimentation of ∼10 m/my throughout the course of the Cenozoic. Sampling of these sediments would provide an unprecedented and unique opportunity to acquire a first-order knowledge about the paleoceanographic history of the central Arctic Ocean. Sampling of the underlying bedrock provides a similarly unique opportunity to decipher the tectonic history of the Lomonosov Ridge and the formation of the Eurasian Basin. The proposed program epitomizes both the spirit and the science of the new Integrated Ocean Drilling Program, calling upon the creative use of mission specific platforms and directly addressing a number of the key scientific questions raised in the IODP Initial Science Plan. Amongst scientific issues relating to "Environmental Change, Processes and Effects" are: - The long-term (50 Ma) climate history of the central Arctic Ocean, and its role in Earth's transition from one extreme (Paleogene greenhouse) to another (Neogene icehouse). - The shorter-term (Neogene) climate history, connecting the Neogene history of the Arctic Ocean to that of the North Atlantic Ocean at sub-millennial scale resolution. Scientific issues relating to "Solid Earth Cycles and Geodynamics" are: the composition and origin of the pre-Cenozoic bedrock underlying the sediment drape; and the rifting and subsidence history of the Lomonosov Ridge. Five sites distributed over six degrees of latitude are proposed, partly with overlapping goals, which will make the drilling expedition less vulnerable to severe local ice conditions. The major goals of this proposal can be achieved by completing one site to 450 mbsf. Should ice conditions at this site be prohibited, a suite of sites from other areas along the ridge can be drilled to achieve the proposed science
Year of Publication: 2004
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; 20 Geophysics, Applied; Arctic Coring EXpedition; Arctic Ocean; Basement; Boreholes; Cenozoic; Climate change; Cores; Data acquisition; Data processing; Drilling; Expedition 302; Expeditions; Geophysical methods; Geophysical profiles; Geophysical surveys; Glaciation; Ice rafting; Integrated Ocean Drilling Program; Lomonosov Ridge; Marine drilling; Marine methods; Marine sediments; Ocean basins; Paleo-oceanography; Paleoclimatology; Paleogeography; Planning; Plate tectonics; Sampling; Sediments; Seismic methods; Seismic profiles; Seismic stratigraphy; Surveys; Well-logging
Coordinates: N875100 N875600 E1393300 E1361000
Record ID: 2007088830
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