603-pp15 - Requirements for ocean formation Sea Water...

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1 Sea Water Evolution Lauren Toth Photo by: Phil MacDonald Requirements for ocean formation • Lots of liquid • Large amounts of ocean elements- H, O, C, N • Liquid must occur at STP- why we have oceans of water not methane or ammonia • Basin- tectonics • Sufficient gravity From Degens 1989 Early Ocean History • Released from crust and upper mantle during the early Archean • Alternate theory: Icicles from space • Recycling of oceans • Na and Cl were the major ions – Also K, Mg, Ca From Degens 1989 Soda Ocean Concept • Henderson-Sellers and Cogley •L ow pCO 2 in atmosphere • High (>9) pH • Precipitation of sodium carbonate Na 2 CO 3 From Degens 1989 Transition to Halite Ocean • Removal of carbonates over time – Movement into sediment pore water – Incorporation into crust – Subduction – Biological use and burial • Leaching on Cl from crust and weathering • Acids like HCl From Degens 1989
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This note was uploaded on 02/10/2012 for the course MAS 603 taught by Professor Haywick during the Fall '11 term at S. Alabama.

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603-pp15 - Requirements for ocean formation Sea Water...

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