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Millennial–scale CaCO₃ and C[subscript ORG] events along the northern and central California margins : stratigraphy and origins

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  • Sediments from five Leg 167 drill sites and three piston cores were analyzed for C[subscript ORG] and CaCO₃. Oxygen isotope stratigraphy on benthic foraminifers was used to assign age models to these sedimentary records. We find that the northern and central California margin is characterized by k.y.-scale events that can be found in both the CaCO₃ and C[subscript ORG] time series. We show that the CaCO₃ events are caused by changes in CaCO₃ production by plankton, not by dissolution. We also show that these CaCO₃ events occur in marine isotope Stages (MIS) 2, 3, and 4 during Dansgaard/Oeschger interstadials. They occur most strongly, however, on the MIS 5/4 glaciation and MIS 2/1 deglaciation. We believe that the link between the northeastern Pacific Ocean and North Atlantic is primarily transmitted by the atmosphere, not the ocean. Highest CaCO₃ production and burial occurs when the surface ocean is somewhat cooler than the modern ocean, and the surface mixed layer is somewhat more stable.
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  • Lyle, M., A.Mix, C. Ravelo, D. Andreasen, H. Heusser, A. Olivarez (2000) Millennial scale CaCO3 and Corg events along the northern and central California Margin: Stratigraphy and origins. <http://www.coas.oregonstate.edu/facultypages/mix/Lyle_etal_2000_ODP167B_Cal if.pdf> In: Lyle, M., Koizumi, I., Richter, C. and Moore, T.C. (eds.) /Scientific Results,/ 167, College Station, TX (Ocean Drilling Program), 163-182.
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  • 167
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