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TEX86Powerpoint - TEX86 A New Temperature Proxy TEX86 TEX86...

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TEX 86 A New Temperature Proxy
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TEX 86 • TEX 86 is actually an index of ratios of GDGT’s in membrane lipids of crenarchaeota So in order to talk about TEX 86 , must begin with crenarchaeota and GDGT’s
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Marine Crenarchaeota Single-celled microorganisms One of the 3 major groups of nonthermophilic archaea Widely distributed Adundant Ecologically diverse
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GDGT’s Membrane lipids of Archaea unique Consist of glycerol dialkyl glycerol tetraethers (GDGT s) Contain cyclopentane rings (up to 8) Number of rings dependent on temperature Temperature adaptation of membrane So lipid distribution reflects environmental temperatures
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TEX 86 Must compare different ratios of GDGT’s with local annual SST Best fit obtained by T etraE ther indeX of tetraethers consisting of 86 carbon atoms
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TEX 86 GDGT’s found in sedimentary rocks up to 112 Myr old Will help to reconstruct oceanic sea water temperatures up to the middle Cretaceous
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Analysis
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