HR: 0800h
AN: PP21B-1386    [Abstracts]
TI: Fluvial fingerprints in northeast Pacific sediments: Unravelling terrestrial-ocean climate linkages
AU: * VanLaningham, S J
EM: svanlani@coas.oregonstate.edu
AF: Oregon State University, College of Oceanic and Atmospheric Sciences 104 Ocean Admin Bldg, Corvallis, OR 97331 United States
AU: Duncan, R
EM: rduncan@coas.oregonstate.edu
AF: Oregon State University, College of Oceanic and Atmospheric Sciences 104 Ocean Admin Bldg, Corvallis, OR 97331 United States
AU: Pisias, N
EM: pisias@coas.oregonstate.edu
AF: Oregon State University, College of Oceanic and Atmospheric Sciences 104 Ocean Admin Bldg, Corvallis, OR 97331 United States
AB: As the earth's climate history becomes better understood, it becomes clear that the terrestrial and oceanic systems interact in complex ways. This is seen in core sites offshore the Pacific Northwest (PNW) of North America. A correlation can be seen in oceanic biostratigraphic assemblages and down-core changes in terrestrial pollen types. However, it is difficult to determine whether this relationship is the result of a coupled migration of terrestrial vegetation and oceanic fauna on millennial timescales or the result of changes in ocean circulation patterns that create more complex pollen pathways to the core sites. This research begins to unravel the answers to this problem by examining down-core changes in sediment provenance on millennial timescales. Preliminary data characterize sediment of 24 rivers from ten geologic provinces between latitudes 36ø N - 47ø N. Through clay mineralogy, major and trace element geochemistry and Ar-Ar "province" ages, ten of the 24 rivers can be uniquely identified, while six of the ten geologic provinces can be uniquely constrained geochemically. With further Nd, Sr and Pb isotopic analyses, we hope to constrain the non-unique sediment sources. We will also be presenting initial down-core geochemical results from cores EW 9504-17PC and EW9504-13PC, offshore southern Oregon and central California, respectively.
DE: 4267 Paleoceanography
DE: 1815 Erosion and sedimentation
DE: 1065 Trace elements (3670)
DE: 1625 Geomorphology and weathering (1824, 1886)
SC: Paleoceanography and Paleoclimatology [PP]
MN: 2004 AGU Fall Meeting