Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean
Goldschmidt 2017 Conference, 13-18 August 2017, Paris
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2017-08-17
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dig-icm-es-10261-1798452019-04-10T12:16:41Z Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean Sherrell, Robert M. Ko, Stanley Kozdon, Reinhard Pelejero, Carles Adkins, Jess Goldschmidt 2017 Conference, 13-18 August 2017, Paris With life-spans of decades to more than 1000 years and skeletons suitable for precise U-Th dating, cold-water corals have the potential to provide climate and environmental information with an unprecedented temporal resolution. We have embarked on long-term culturing experiments using Desmophyllum dianthus (solitary; lifespan ~100 yrs) to calibrate geochemical proxies for dissolved nutrients (P/Ca, Ba/Ca), the carbonate system (U/Ca), and calcification temperature (Li/Mg) by controlling seawater composition, temperature, and pH in flow-through aquariums. In order to assess skeletal extension rates and to identify lab-grown aragonite for analysis, dyes and Pb-isotopes were used as visual and chemical markers. While the culturing experiments are ongoing for future calibration, we improved protocols to analyze D. dianthus for P/Ca, Ba/Ca, U/Ca and Li/Mg (and U-Th `speed-dating´) by LA-ICPMS, and compared the results with data acquired by micromilling and solution ICPMS. This analytical development was performed on fossil D. dianthus (U-Th ages 13-27 ka) collected from seamounts south of Tasmania. Initial results of Li/Mg thermometry are promising, yielding intermediate water temperatures of 4.0 -5.5°C for Glacial age corals. Similarly, early results of U-Th `speed-dating´ by LA-ICPMS are very encouraging; derived ages are less precise but match, within error, conventionally measured U-Th ages. Preliminary proxy data from the Tasmanian corals indicate that they may contain a record of changes in nutrients in Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) during the Last Glacial-Holocene period. This record will be expanded in a future study by analyzing a large collection of live-collected modern samples as well as an unexploited archive of ~400 fossil corals from waters around New Zealand Peer Reviewed 2019-04-10T12:13:07Z 2019-04-10T12:13:07Z 2017-08-17 2019-04-10T12:13:07Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 Goldschmidt 2017 Conference (2017) http://hdl.handle.net/10261/179845 https://goldschmidtabstracts.info/abstracts/abstractView?id=2017002762 Sí none |
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| description |
Goldschmidt 2017 Conference, 13-18 August 2017, Paris |
| format |
comunicación de congreso |
| author |
Sherrell, Robert M. Ko, Stanley Kozdon, Reinhard Pelejero, Carles Adkins, Jess |
| spellingShingle |
Sherrell, Robert M. Ko, Stanley Kozdon, Reinhard Pelejero, Carles Adkins, Jess Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean |
| author_facet |
Sherrell, Robert M. Ko, Stanley Kozdon, Reinhard Pelejero, Carles Adkins, Jess |
| author_sort |
Sherrell, Robert M. |
| title |
Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean |
| title_short |
Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean |
| title_full |
Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean |
| title_fullStr |
Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean |
| title_full_unstemmed |
Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean |
| title_sort |
proxy calibration of cultured cold water corals and application to fossil corals from the southern ocean |
| publishDate |
2017-08-17 |
| url |
http://hdl.handle.net/10261/179845 |
| work_keys_str_mv |
AT sherrellrobertm proxycalibrationofculturedcoldwatercoralsandapplicationtofossilcoralsfromthesouthernocean AT kostanley proxycalibrationofculturedcoldwatercoralsandapplicationtofossilcoralsfromthesouthernocean AT kozdonreinhard proxycalibrationofculturedcoldwatercoralsandapplicationtofossilcoralsfromthesouthernocean AT pelejerocarles proxycalibrationofculturedcoldwatercoralsandapplicationtofossilcoralsfromthesouthernocean AT adkinsjess proxycalibrationofculturedcoldwatercoralsandapplicationtofossilcoralsfromthesouthernocean |
| _version_ |
1777666902173155328 |