Proxy calibration of cultured cold water corals and application to fossil corals from the Southern Ocean
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 o...
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ftcsic:oai:digital.csic.es:10261/179845 2024-02-11T09:58:50+01:00 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 2017-08-17 http://hdl.handle.net/10261/179845 unknown https://goldschmidtabstracts.info/abstracts/abstractView?id=2017002762 Sí Goldschmidt 2017 Conference (2017) http://hdl.handle.net/10261/179845 none comunicación de congreso http://purl.org/coar/resource_type/c_5794 2017 ftcsic 2024-01-16T10:38:12Z 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 Conference Object Antarc* Antarctic Southern Ocean Digital.CSIC (Spanish National Research Council) Antarctic New Zealand Southern Ocean |
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collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
description |
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 |
format |
Conference Object |
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 |
url |
http://hdl.handle.net/10261/179845 |
geographic |
Antarctic New Zealand Southern Ocean |
geographic_facet |
Antarctic New Zealand Southern Ocean |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://goldschmidtabstracts.info/abstracts/abstractView?id=2017002762 Sí Goldschmidt 2017 Conference (2017) http://hdl.handle.net/10261/179845 |
op_rights |
none |
_version_ |
1790594622703009792 |