“Cryptic” diagenesis and its implications for speleothem geochronologies
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- 作者：Petra Bajoa ; pbajo@student.unimelb.edu.au" class="auth_mail" title="E-mail the corresponding author ; John Hellstromb ; Silvia Frisiaa ; c ; Russell Drysdalea ; Jay Blackb ; Jon Woodheadb ; Andrea Borsatoc ; Giovanni Zanchettad ; Malcolm W. Wallaceb ; Eleonora Regattierie ; Ralf Haeseb
- 关键词：Speleothems ; U-Th dating ; Outliers ; U-loss ; Micro-CT ; Petrography
- 刊名：Quaternary Science Reviews
- 出版年：2016
- 出版时间：15 September 2016
- 年：2016
- 卷：148
- 期：Complete
- 页码：17-28
- 全文大小：2680 K
文摘
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Isolated domains in apparently pristine speleothems can show open system behavior.
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“Cryptic” diagenesis with very localized U-loss is observed in a Holocene speleothem.
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Misinterpretation of U-Th age estimates in such samples can only be eliminated based on multi-aliquot age determinations.
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Micro-CT scans recorded a limited number of voids in otherwise dense speleothem.