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RADIOCARBON DATING OF DEEP-SEA CORALS

RADIOCARBON DATING OF DEEP-SEA CORALS,Jess F Adkins,Shelia Griffin,Michaele Kashgarian,Hai Cheng,E R M Druffel,E A Boyle,R Lawrence Edwards,Chuan-Chou

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RADIOCARBON DATING OF DEEP-SEA CORALS   (Citations: 16)
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Deep-sea corals are a promising new archive of paleoclimate. Coupled radiocarbon and U-series dates allow 14C to be used as a tracer of ocean circulation rate in the same manner as it is used in the modern ocean. Diagenetic alteration of coral skeletons on the seafloor requires a thorough cleaning of contaminating phases of carbon. In addition, 10% of the coral must be chemically leached prior to dissolution to remove adsorbed modern CO 2. A survey of modern samples from the full 14C gradient in the deep ocean demonstrates that the coralline CaCO 3 records the radiocarbon value of the dissolved inorganic carbon.
Published in 2002.
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    • ...Previous work has shown that carbonate-secreting organisms secrete their skeletons mainly from dissolved carbonate rather than metabolically or nutritionally derived carbonate ions (Adkins et al., 2002, 2003; Grottoli, 2002), but although there is no evidence to the contrary for sclerosponges, knowledge of carbonate ion pathways lends little information about thorium pathways into the skeleton...

    Brad E. Rosenheim, et al. Constraining initial 230Th activity in incrementally deposited, biogen...

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