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Geologic variability of conodont strontium isotopic composition quantified by laser ablation multiple collection inductively coupled plasma mass spectrometry
Griffin, Julie M.1,2; Montanez, Isabel P.2; Glessner, Justin J. G.3; Chen, Jitao(陈吉涛)2,4,5; Willmes, Malte6,7
2021-04-15
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume568Pages:11
Abstract

Conodont microfossils record seawater strontium isotope values (Sr-87/Sr-86), 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 Sr-87/Sr-86 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 Sr-87/Sr-86 values for age-correlations and environmental interpretations. Here, for the first time, we compare solution and LA MC-ICP-MS Sr-87/Sr-86 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/Delta m = similar to 7500) and analyzing conodont tissue with low Rb-85/Sr-88 (< 0.001), we find laser ablation copacetic with solution Sr-87/Sr-86 values. The two-standard-deviation of these LA Sr-87/Sr-86 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 Sr-87/Sr-86 variability beyond the precision of reference materials (2SE = 0.00001). This finding suggests that solution Sr-87/Sr-86 values determined by dissolving multiple conodonts are homogenizing the conodont Sr-87/Sr-86 signal. As such, the precision of these solution measurements does not capture the geologic variability of conodont Sr-87/Sr-86 within a stratigraphic level, which may originate from differential diagenetic alteration. Conodont Sr-87/Sr-86 measurements that do not account for this variability are at risk of false calibrations with the paleo-seawater Sr-87/Sr-86 curve, which has implications for the timing of geologic events and reconstructions of paleo-environmental changes.

KeywordBioapatite Spectral interference Chemostratigraphy Mass resolution Intra-stratigraphic variability
DOI10.1016/j.palaeo.2021.110308
Indexed BySCI
Language英语
Funding ProjectUCD Durrell Fund ; Geological Society of America ; Society for Sedimentary Geology ; Exxon Mobil ; American Association of Petroleum Geologists ; National Science Foundation[EAR-1024737] ; National Science Foundation[EAR-1338281] ; National Science Foundation[EAR-1554897]
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:000636766700006
Funding OrganizationUCD Durrell Fund ; Geological Society of America ; Society for Sedimentary Geology ; Exxon Mobil ; American Association of Petroleum Geologists ; National Science Foundation
PublisherELSEVIER
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/38010
Collection中国科学院南京地质古生物研究所
Corresponding AuthorGriffin, Julie M.
Affiliation1.Calif State Univ Sacramento, Dept Geol, 6000 J St, Sacramento, CA 95819 USA
2.Univ Calif Davis, Dept Earth & Planetary Sci, One Shields Ave, Davis, CA 95616 USA
3.Univ Calif Davis, Interdisciplinary Ctr Plasma Mass Spectrometry, One Shields Ave, Davis, CA 95616 USA
4.Chinese Acad Sci, State Key Lab Palaeobiol & Stratig, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
5.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Nanjing 210008, Peoples R China
6.Univ Calif Santa Cruz, Inst Marine Sci, 115 McAllister Way, Santa Cruz, CA 95064 USA
7.Southwest Fisheries Sci Ctr, Natl Marine Fisheries Serv, 110 McAllister Way, Santa Cruz, CA 95064 USA
Recommended Citation
GB/T 7714
Griffin, Julie M.,Montanez, Isabel P.,Glessner, Justin J. G.,et al. Geologic variability of conodont strontium isotopic composition quantified by laser ablation multiple collection inductively coupled plasma mass spectrometry[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2021,568:11.
APA Griffin, Julie M.,Montanez, Isabel P.,Glessner, Justin J. G.,Chen, Jitao,&Willmes, Malte.(2021).Geologic variability of conodont strontium isotopic composition quantified by laser ablation multiple collection inductively coupled plasma mass spectrometry.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,568,11.
MLA Griffin, Julie M.,et al."Geologic variability of conodont strontium isotopic composition quantified by laser ablation multiple collection inductively coupled plasma mass spectrometry".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 568(2021):11.
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