Yamamoto, Masanobu et al. (2000): Late Quaternary records of organic carbon, calcium carbonate, and biomarkers from Site 1016 off Point Conception, California margin

ODP 167
ODP 167 1016


Yamamoto, Masanobu
Geological Survey of Japan, Mineral and Fuel Resources, Ibaraki, Japan

Yamamuro, Masumi
Hokkaido University, Japan

Tada, Ryuji
Ocean Drilling Program, United States

Late Quaternary records of organic carbon, calcium carbonate, and biomarkers from Site 1016 off Point Conception, California margin
In: Lyle, Mitchell, Koizumi, Itaru, Richter, Carl, Behl, Richard J., Boden, Per, Caulet, Jean-Pierre, Delaney, Margaret L., deMenocal, Peter, Desmet, Marc, Fornaciari, Eliana, Hayashida, Akira, Heider, Franz, Hood, Julie A., Hovan, Steven A., Janecek, Thomas R., Janik, Aleksandra G., Kennett, James P., Lund, David, Machain Castillo, Maria L., Maruyama, Toshiaki, Merrill, Russell B., Mossman, David J., Pike, Jennifer, Ravelo, A. Christina, Rozo Vera, Gloria A., Stax, Rainer, Tada, Ryuji, Thurow, Juergen W., Yamamoto, Masanobu, Nessler, Susan (editor), Miller, Christine M. (editor), Peters, Lorri L. (editor), Proceedings of the Ocean Drilling Program, scientific results, California margin; covering Leg 167 of the cruises of the drilling vessel JOIDES Resolution, Acapulco, Mexico, to San Francisco, California, sites 1010-1022, 20 April-16 June 1996
Texas A & M University, Ocean Drilling Program, College Station, TX, United States
Total organic carbon (TOC) and calcium carbonate (CaCO (sub 3) ) concentrations were determined for 304 samples, and biomarkers were analyzed for 101 samples from Core 167-1016C-1H. TOC varies between 1% and 2%, and CaCO (sub 3) is typically 1%-4%, with peaks reaching 14%. Paleotemperature estimated from U (super k') (sub 37) varies from 8.5 degrees to 17.5 degrees C. The U (super k') (sub 37) variation implies that Core 167-1016C-1H covers oxygen isotope Stages 1-6. Peaks of diatom-derived C (sub 25:1) HBI alkene concentrations occur during warming intervals, suggesting intensified upwelling during deglaciation. The concentrations of haptophyte-derived alkenones and diatom-derived C (sub 25:1) HBI alkene vary out of phase, which presumably resulted from the changes in the mode of nutrient supply to surface mixed layer. Maximal CaCO (sub 3) contents (>10%) were observed in both warming and cooling intervals. The peak in cooling interval relates to an alkenone maximum, whereas the peaks in warming intervals do not. This implies that carbonate production is not the only factor controlling carbonate compensation depth at this site, and it suggests considering the changes in North Pacific deep-water chemistry. Petroleum-type compounds are present in Site 1016 sediments. Their concentrations are maximized in the warming intervals that correspond to the timing of destruction of a huge tar mound off Point Conception. The tarry material was presumably transported by the Arguello Fan system to Site 1016.
Coverage:Geographic coordinates:
West:-122.1635East: -122.1635

Quaternary geology; Geochemistry of rocks, soils, and sediments; algae; alkenones; biomarkers; biostratigraphy; calcium carbonate; California; carbon; Cenozoic; climate change; concentration; continental margin; diatoms; East Pacific; geochemistry; ketones; Leg 167; microfossils; North Pacific; Northeast Pacific; nutrients; Ocean Drilling Program; ODP Site 1016; organic carbon; organic compounds; Pacific Ocean; paleoclimatology; Plantae; Point Conception; Quaternary; Santa Barbara County California; temperature; total organic carbon; United States; upper Quaternary;