d18O (Ocean2kHR_126): interpretation4_scope: '' has been replaced by 'isotope'
Sr/Ca (Ocean2kHR_127): interpretation3_scope: '' has been replaced by 'isotope'
Sr/Ca (Ocean2kHR_127): interpretation4_scope: '' has been replaced by 'isotope'
d18O (Ocean2kHR_128): interpretation4_scope: '' has been replaced by 'isotope'
Sr/Ca (Ocean2kHR_129): interpretation3_scope: '' has been replaced by 'isotope'
Sr/Ca (Ocean2kHR_129): interpretation4_scope: '' has been replaced by 'isotope'

Haase-Schramm, Alexandra , Bohm, Florian , Eisenhauer, Anton , Dullo, Wolf-Christian , Joachimski, Michael M. , Hansen, Bent , Reitner, Joachim

Haase-Schramm, A., Boehm, F., Eisenhauer, A., Dullo, W.-C., Joachimski, M. M., Hansen, B. and Reitner, J.: Sr/Ca ratios and oxygen isotopes from sclerosponges: Temperature history of the Caribbean mixed layer and thermocline during the Little Ice Age, Paleoceanography, 18(3), n/a–n/a, doi:10.1029/2002pa000830, 2003.

Sr/Ca ratios and oxygen isotopes from sclerosponges: Temperature history of the Caribbean mixed layer and thermocline during the Little Ice Age

sclerosponges were dated using U/Th radiometric techniques and then analyzed using high resolution micromilling for oxygen isotope analysis via isotope ratio mass spectrometry and laser ablation sampling for Sr/Ca analysis via ICP-MS. Constant-growth age models constructed from U/Th dating indicate growth rates of 145 mmy1 for the Exuma sclerosponge and 172 mmy1 for the TOTO sclerosponge (auxiliary material1). The radiometric age model of the TOTO sclerosponge was tuned to annual Sr/ Ca variations after Swart et al. [2002], however because tuned age models and constant growth models are within 5% [Swart et al., 2002], the U/Th constant growth model was used for the Exuma sclerosponge.

U/Th dating and Sr/Ca for annual cycles to define chronology

mode of skeleton formation of Ceratoporella nicholsoni suggest that these sponges precipitate aragonite close to isotopic equilibrium (bohm, 2000).

Kiel III automated carbonate device attached to a Delta Plus isotope ratio mass spectrometer (IRMS)