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Published byLandon Langner Modified over 9 years ago
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Earth’s climate history
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Cenozoic cooling
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CaCO 3 is taken up by marine organisms Coccolithophorid Foraminifer
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... as is SiO 2 Diatom (SiO 2 ) (50microns) Radiolarian (SiO 2 ) (50 microns)
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Carbon reservoirs today Destination of atmospheric CO 2
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Inorganic carbon cycle Carbon ends up here
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Volcanic eruptions main source of CO 2
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BLAG model – spreading rates sometimes fast, sometimes slow
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Pre-Quaternary atmospheric CO 2 levels cannot yet be directly determined. Can be modeled from the carbon isotope record? BLAG (Berner, Lasaga, Garrels) Model Steady-State Flux Balance Equation F wc +F mc + F wg = F bc + F bg w: weathering m: metamorphism b: burial c: carbonate g: organic
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Climate through Earth history
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Cenozoic cooling
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Spreading rates have decreased over last 65 million years
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Silicate rock weathering
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Weathering rates increase over Cenozoic Does the amount of high elevation terrain result in unusual physical weathering? Most likely given 10 fold increase of sediment to the Indian Ocean – Steep terrain along southern Himalayan margin – Presence of powerful South Asian monsoon
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Tibetan plateau
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Changes in amount of uplift of continental rock could regulate amount of weathering “Uplift weathering hypothesis” Uplift mainly when continents collide
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Climate through Earth history
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