Title
Spatial variability of initial 230Th/232Th in modern Porites from the inshore region of the Great Barrier Reef
Author(s)
Clark, T.R.;Zhaoa, J.;Feng, Y.;Done, T.J.;Jupiter, S.;Lough, J.;M. Pandolfi, J.M.
Published
2012
Publisher
Geochimica et Cosmochimica Acta
Abstract
± 1.4 × 10−6) that encompasses the full variation of the 39 230Th/232Th0 measurements is recommended as a more appropriate value for initial 230Th corrections for U-series dating of most Porites samples from inshore regions of the GBR. This will result in significant improvement in both the precision and accuracy of the corrected 230Th ages related to those based on the assumed bulk Earth 230Th/232Th0 value of 4.3 ± 4.3 × 10−6. However, several anomalously high 230Th/232Th0 values reaching up to 28.0 ± 1.6 × 10−6 occasionally found in some coral annual bands coinciding with El Niño years imply high 230Th/232Th0 sources and highlight the complexities of understanding 230Th/232Th0 variability. For U-series dating of young coral samples from such sites where anomalous 230Th/232Th0 values occur, we suggest replicate dating of multiple growth bands with known age difference to verify age accuracy.
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PUB13582