TY - JOUR
T1 - Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb carbonate geochronology
T2 - Strategies, progress, and limitations
AU - Roberts, Nick M.W.
AU - Drost, Kerstin
AU - Horstwood, Matthew S.A.
AU - Condon, Daniel J.
AU - Chew, David
AU - Drake, Henrik
AU - Milodowski, Antoni E.
AU - McLean, Noah M.
AU - Smye, Andrew J.
AU - Walker, Richard J.
AU - Haslam, Richard
AU - Hodson, Keith
AU - Imber, Jonathan
AU - Beaudoin, Nicolas
AU - Lee, Jack K.
N1 - Publisher Copyright:
© Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
PY - 2020/1/24
Y1 - 2020/1/24
N2 - Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb geochronology of carbonate minerals, calcite in particular, is rapidly gaining popularity as an absolute dating method. The high spatial resolution of LA-ICP-MS U-Pb carbonate geochronology has benefits over traditional isotope dilution methods, particularly for diagenetic and hydrothermal calcite, because uranium and lead are heterogeneously distributed on the sub-millimetre scale. At the same time, this can provide limitations to the method, as locating zones of radiogenic lead can be time-consuming and "hit or miss". Here, we present strategies for dating carbonates with in situ techniques, through imaging and petrographic techniques to data interpretation; our examples are drawn from the dating of fracture-filling calcite, but our discussion is relevant to all carbonate applications. We review several limitations to the method, including open-system behaviour, variable initial-lead compositions, and U-daughter disequilibrium. We also discuss two approaches to data collection: traditional spot analyses guided by petrographic and elemental imaging and image-based dating that utilises LA-ICP-MS elemental and isotopic map data.
AB - Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) U-Pb geochronology of carbonate minerals, calcite in particular, is rapidly gaining popularity as an absolute dating method. The high spatial resolution of LA-ICP-MS U-Pb carbonate geochronology has benefits over traditional isotope dilution methods, particularly for diagenetic and hydrothermal calcite, because uranium and lead are heterogeneously distributed on the sub-millimetre scale. At the same time, this can provide limitations to the method, as locating zones of radiogenic lead can be time-consuming and "hit or miss". Here, we present strategies for dating carbonates with in situ techniques, through imaging and petrographic techniques to data interpretation; our examples are drawn from the dating of fracture-filling calcite, but our discussion is relevant to all carbonate applications. We review several limitations to the method, including open-system behaviour, variable initial-lead compositions, and U-daughter disequilibrium. We also discuss two approaches to data collection: traditional spot analyses guided by petrographic and elemental imaging and image-based dating that utilises LA-ICP-MS elemental and isotopic map data.
UR - https://www.scopus.com/pages/publications/85123288701
UR - https://www.scopus.com/pages/publications/85123288701#tab=citedBy
U2 - 10.5194/gchron-2-33-2020
DO - 10.5194/gchron-2-33-2020
M3 - Article
AN - SCOPUS:85123288701
SN - 2628-3697
VL - 2
SP - 33
EP - 61
JO - Geochronology
JF - Geochronology
IS - 1
ER -