9_cretaceous - Mesozoic Paleoclimate Icehouse Greenhouse...

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Mesozoic Paleoclimate Frakes, 1979 Icehouse Icehouse Icehouse Greenhouse Greenhouse Greenhouse Ruddiman Fig. 5-1
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Triassic Climate Pangea starting to break up, still a large continental landmass High seasonality Arid (evaporites) Plot of evaporites Through time (Ruddiman)
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Mid Jurassic/ Early Cretaceous Cooling Break up of Pangea (burial of organic matter a la snowball Earth?) IRD at high latitudes (seasonal ice) Early Cretaceous IRD Frakes and Francis, 1988
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Mid Cretaceous Ruddiman, 6-1
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Mid Cretaceous Warmth Evidence of warmth Cret = chalk Poleward displacement of floral and faunal boundaries (~10-15 degrees) champosaurous (crocodile-like)in the Arctic circle Corals to 40 degrees Broad leaf evergreens in northern high latitudes δ 18 O = warmer deep waters, warmer poles and tropics No evidence of IRD- ice debate Common sediments – coals, laterites, bauxites
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Mid Cretaceous Warmth Cause of warmth Berner - 6x CO 2 Sources of CO 2 Seafloor spreading rates Large Igneous Provinces (LIPS)
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Seafloor Spreading Rates Kominz, 1984
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Mid Cretaceous Warmth Outgassing (CO 2 ) High sea level LIPs - Large igneous provinces (LIPs) are voluminous emplacements of predominantly mafic extrusive and intrusive rock whose origins lie in processes other than 'normal' seafloor spreading. LIPs include continental flood basalts and associated intrusive rocks,
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9_cretaceous - Mesozoic Paleoclimate Icehouse Greenhouse...

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