12_cz_cooling - Cenozoic Cooling Generally cooling Cooling...

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Cenozoic Cooling Generally cooling Cooling Steps Eocene/Oligocene mid Miocene Pliocene Zachos et al., 2007 Oi1 Mi1
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Cenozoic Cooling Cause(s)? Polar position Hypothesis (paleogeo) Spreading Rate Hypothesis (CO 2 ) Uplift Weathering Hypothesis (CO 2 ) Ocean Heat Transport Hypothesis (gateways) Zachos et al., 2007 Oi1 Mi1
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Cenozoic Cooling Polar position? Marginal pole during mid Cretaceous
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Cenozoic Cooling Polar position? Fully polar in Eocene
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Cenozoic Cooling • CO 2 ? Cause of CO 2 decrease? Change in sources? Spreading Rate Hypothesis Berner curve Pagani et al., 2005 Boron- Pearson and Palmer, 2000 Alkenone- Pagani et al., 1999
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Cenozoic Cooling and CO 2 Zachos et al., 2007 Comparison of CO 2 and climate records
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Cenozoic Cooling Kominz, 1984 Spreading Rate Hypothesis - Generally decrease, but start to increase ~10 Ma Ruddiman Fig. 6-12
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Cenozoic Cooling Pattern of cooling is not consistent with changes in CO 2 driven by sources Seafloor spreading rates Non-MOR volcanism Sinks?
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Cenozoic Cooling CO 2 sinks Uplift Hypothesis Cooling starts ~50Ma Himalayan Plateau subaqueous until ~52 Ma (Himalayas vs. Andes) Zachos et al., 2007 Oi1 Mi1
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Cenozoic Cooling Scotese Uplift of Himalayas starts ~40Ma
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12_cz_cooling - Cenozoic Cooling Generally cooling Cooling...

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