Please use this identifier to cite or link to this item:
Item metadata
Title: 230Th/U-dating of a late Holocene low uranium speleothem from Cuba
Authors: Fensterer, Claudia ‎
Scholz, Denis
Hoffmann, Dirk
Mangini, Augusto
Pajón, Jesús María
Issue Date: 2010
Publisher: IOP Publishing
Citation: IOP Conference Series: Earth and Environmental Science, 2010, 9, 012015
Abstract: We present 22 U-series ages for a stalagmite from north-western Cuba based on multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) and thermal ionisation mass spectrometry (TIMS). Our results reveal that the stalagmite continuously grew within the last ~1400a. Low uranium content of the sample and thus, extremely low 230Th concentrations limit the precision and accuracy of 230Th/U-dating by TIMS. Samples measured by MC-ICPMS show a high variability of 232Th content along the growth axis with some sections significantly affected by initial 230Th from a detrital phase. An a-priori bulk earth ratio for (238U/232Th) cannot be used to accurately account for this initial 230Th. Using an age model based on the 230Th/U ages determined on samples with low or negligible 232Th concentration, we find that the (238U/232Th) activity ratio of the detrital phase is an order of magnitude larger than the bulk earth value, indicating the importance of an accurately determined correction factor.
ISSN: 1755-1307
DOI: 10.1088/1755-1315/9/1/012015
Type: Article
Appears in Collections:Geocronología y Geología

Files in This Item:
File Description SizeFormat 
230ThU-dating of a late Holocene low uranium speleothem from Cuba_Fensterer_et_al_2010.pdf733,98 kBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons