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Sources of Inaccuracy in Boron Isotope Measurement Using LA‐MC‐ICP‐MS (2023)

Fietzke, Jan ; Anagnostou, Eleni ; Fietzke, Jan; ; [weitere]

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Publikationsdatum: 2023-11-17

Beschreibung: 〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Laser ablation multi‐collector‐inductively coupled plasma‐mass spectrometry (LA‐MC‐ICP‐MS) has become a valuable tool for the 〈italic toggle="no"〉in situ〈/italic〉 measurement of the boron isotope composition of geological samples at high (tens to hundreds of μm) spatial resolution. That said, this application suffers from significant analytical challenges. We focus in this study on the underlying processes of two of the main causes for inaccuracies using this technique. We provide empirical evidence that not only Ca ions (Sadekov 〈italic〉et al〈/italic〉. 2019, Standish 〈italic〉et al〈/italic〉. 2019, Evans 〈italic〉et al〈/italic〉. 2021) but also Ar ions, that are reflected within the flight tube of the mass spectrometer, are the source for previously reported issues with spectral baselines. We also address the impact of plasma conditions on the instrumental mass fractionation as a source for matrix‐ and mass‐load‐related analytical biases. Comparing experimental data with the results of a dedicated release and diffusion model (RDM) we estimate that a close to complete (~ 97%) release of boron from the sample aerosol is needed to allow for consistently accurate LA boron isotope measurement results without the need for corrections.〈/p〉

Beschreibung: Key Points: 〈list list-type="bullet" id="ggr12500-list-0101"〉 〈list-item〉〈p〉Two separate main sources for inaccuracy of boron isotope measurements by laser ablation: B isotope fractionation in the ICP and the known scattered ion baseline problem.〈/p〉〈/list-item〉 〈list-item〉〈p〉Boron isotope fractionation in the ICP varies systematically with plasma condition (NAI).〈/p〉〈/list-item〉 〈list-item〉〈p〉Behaviour of B isotopes within the ICP simulated by a release and diffusion model (RDM).〈/p〉〈/list-item〉 〈/list〉 〈boxed-text position="anchor" content-type="graphic" id="ggr12511-blkfxd-0001" xml:lang="en"〉 〈graphic position="anchor" id="jats-graphic-1" xlink:href="urn:x-wiley:16394488:media:ggr12511:ggr12511-toc-0001"〉 〈/graphic〉 〈/boxed-text〉 〈/p〉

Schlagwort(e): ddc:550.78 ; boron isotopes ; laser ablation ; scattered ions ; mass fractionation ; plasma conditions

Sprache: Englisch

Materialart: doc-type:article

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Boron, oxygen and carbon isotopes, and trace element ratios in planktic foraminifera of different ODP Sites across the Middle Eocene Climatic Optimum (2019)

Henehan, Michael J ; Edgar, Kirsty M ; Foster, Gavin L ; [weitere]

PANGAEA

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Publikationsdatum: 2024-01-09

Beschreibung: This dataset contains measurements of δ11B, δ13C and δ18O, as well as the elemental ratios Magnesium/Calcium, Aluminium/Calcium, Strontium/Calcium from planktic foraminifera from six different ODP sites.

Schlagwort(e): 114-702B; 143-865B; 143-865C; 207-1260A; 207-1260B; 208-1263B; AGE; Al/Ca; Aluminium/Calcium ratio; boron isotopes; Calculated; Depth, description; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Foraminifera, planktic δ11B; Foraminifera, planktic δ13C; Foraminifera, planktic δ18O; Joides Resolution; Leg114; Leg143; Leg207; Leg208; Magnesium/Calcium ratio; MECO; Mg/Ca; North Pacific Ocean; Ocean Drilling Program; ODP; planktic foraminifera; Sample code/label; South Atlantic Ocean; Species; Sr/Ca; Strontium/Calcium ratio; Walvis Ridge, Southeast Atlantic Ocean; δ11B, standard deviation

Materialart: Dataset

Format: text/tab-separated-values, 433 data points

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Revisiting the Middle Eocene Climatic Optimum “Carbon Cycle Conundrum” With New Estimates of Atmospheric pCO2 From Boron Isotopes (2021)

Henehan, Michael J. ; Edgar, Kirsty M. ; Foster, Gavin L. ; [weitere]

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Publikationsdatum: 2021-10-15

Beschreibung: The Middle Eocene Climatic Optimum (MECO) was a gradual warming event and carbon cycle perturbation that occurred between 40.5 and 40.1 Ma. A number of characteristics, including greater-than-expected deep-sea carbonate dissolution, a lack of globally coherent negative δ13C excursion in marine carbonates, a duration longer than the characteristic timescale of carbon cycle recovery, and the absence of a clear trigger mechanism, challenge our current understanding of the Earth system and its regulatory feedbacks. This makes the MECO one of the most enigmatic events in the Cenozoic, dubbed a middle Eocene “carbon cycle conundrum.” Here we use boron isotopes in planktic foraminifera to better constrain pCO2 changes over the event. Over the MECO itself, we find that pCO2 rose by only 0.55–0.75 doublings, thus requiring a much more modest carbon injection than previously indicated by the alkenone δ13C-pCO2 proxy. In addition, this rise in pCO2 was focused around the peak of the 400 kyr warming trend. Before this, considerable global carbonate δ18O change was asynchronous with any coherent ocean pH (and hence pCO2) excursion. This finding suggests that middle Eocene climate (and perhaps a nascent cryosphere) was highly sensitive to small changes in radiative forcing.

Schlagwort(e): 551 ; boron isotopes ; pCO2 reconstruction ; Middle Eocene Climatic Optimum ; carbon cycle ; paleoclimate ; cryosphere

Sprache: Englisch

Materialart: map

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