Geologic variability of conodont strontium isotopic composition quantified by laser ablation multiple collection inductively coupled plasma mass spectrometry

Griffin, Julie M.; Montañez, Isabel P.; Glessner, Justin J.G.; Chen, Jitao; Willmes, Malte

doi:10.1016/j.palaeo.2021.110308

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Geologic variability of conodont strontium isotopic composition quantified by laser ablation multiple collection inductively coupled plasma mass spectrometry

2021
By Griffin, Julie M. ; Montañez, Isabel P. ; Glessner, Justin J.G. ; ...
Source: Palaeogeography, Palaeoclimatology, Palaeoecology, 568, 110308

[PDF-2.95 MB]

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Journal Title:

Palaeogeography, Palaeoclimatology, Palaeoecology
Personal Author:

Griffin, Julie M. ; Montañez, Isabel P. ; Glessner, Justin J.G. ; Chen, Jitao ; Willmes, Malte

Griffin, Julie M. ; Montañez, Isabel P. ; Glessner, Justin J.G. ; Chen, Jitao ; Willmes, Malte Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SWFSC (Southwest Fisheries Science Center) Less -
Description:

Conodont microfossils record seawater strontium isotope values (87Sr/86Sr), permitting chemostratigraphic correlation for tectonic and climatic reconstructions of the Paleozoic and early Mesozoic (541–201 Ma). Laser ablation multiple collection inductively coupled plasma mass spectrometry (LA MC-ICP-MS) can provide rapid, high spatial resolution 87Sr/86Sr analysis of conodont bioapatite but has not been validated by comparison with solution analysis. Validation of LA MC-ICP-MS should be completed in order to use the conodont 87Sr/86Sr values for age-correlations and environmental interpretations. Here, for the first time, we compare solution and LA MC-ICP-MS 87Sr/86Sr analyses of Carboniferous-age conodonts. Furthermore, we use quadrupole LA ICP-MS to determine concentrations of trace elements potentially responsible for isobaric interferences. Using increased mass resolving power (m/∆m = ~7500) and analyzing conodont tissue with low 85Rb/88Sr (< 0.001), we find laser ablation copacetic with solution 87Sr/86Sr values. The two-standard-deviation of these LA 87Sr/86Sr ratios (average 2SD = 0.00105) are within the two-standard-error uncertainty of solution measurements (average 2SE = 0.00001) on conodonts from the same stratigraphic level. The LA measurements are at a higher spatial resolution and on average 0.00015 higher than solution measurements. Uncertainty of the mean calculations, made on duplicate LA MC-ICP-MS analyses of individual conodonts from the same stratigraphic level, exhibit 87Sr/86Sr variability beyond the precision of reference materials (2SE = 0.00001). This finding suggests that solution 87Sr/86Sr values determined by dissolving multiple conodonts are homogenizing the conodont 87Sr/86Sr signal. As such, the precision of these solution measurements does not capture the geologic variability of conodont 87Sr/86Sr within a stratigraphic level, which may originate from differential diagenetic alteration. Conodont 87Sr/86Sr measurements that do not account for this variability are at risk of false calibrations with the paleo-seawater 87Sr/86Sr curve, which has implications for the timing of geologic events and reconstructions of paleo-environmental changes.
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Earth-Surface Processes Ecology, Evolution, Behavior And Systematics Oceanography Paleontology
Source:

Palaeogeography, Palaeoclimatology, Palaeoecology, 568, 110308
DOI:

https://doi.org/10.1016/j.palaeo.2021.110308
ISSN:

0031-0182
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PDF
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Elsevier BV
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Journal Article
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https://creativecommons.org/licenses/by-nc-nd/4.0/
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CC BY-NC-ND
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urn:sha-512:188b209be7c4206af1e6db068b1bfa0decab65720dc6435565d416666c4c6da2c20bb6a6820b4c39a8a849e52e663a3a058a6e6eb09ff8be16fb5c18b7f94d7e
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Geologic variability of conodont strontium isotopic composition quantified by laser ablation multiple collection inductively coupled plasma mass spectrometry

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