BLAG model – spreading rates sometimes fast, sometimes slow
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
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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