Nano‐Powdered Calcium Carbonate Reference Materials: Significant Progress for Microanalysis?

Jochum, Klaus Peter; Garbe‐Schönberg, Dieter; Veter, Marina; Stoll, Brigitte; Weis, Ulrike; Weber, Michael; Lugli, Federico; Jentzen, Anna; Schiebel, Ralf; Wassenburg, Jasper A.; Jacob, Dorrit E.; Haug, Gerald H.

doi:10.1111/ggr.12292

Cited by 59 publications

(80 citation statements)

References 35 publications

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“…Recent progress in the synthetic production of custom‐made materials and further processing of established RMs enables the geochemical community to design very specific materials of different compositions and by different techniques (Tabersky et al , Garbe‐Schönberg and Müller , Bao et al , Wu et al , Jochum et al ). One possibility is the flame spray technique, which allows production of materials with a nanoscale grain size and a customised composition and matrix for different applications.…”

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confidence: 99%

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

Weber

Lugli

Hattendorf

et al. 2019

Geostandard Geoanalytic Res

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The in situ measurement of Sr isotopes in carbonates by MC‐ICP‐MS is limited by the availability of suitable microanalytical reference materials (RMs), which match the samples of interest. Whereas several well‐characterised carbonate reference materials for Sr mass fractions > 1000 µg g−1 are available, there is a lack of well‐characterised carbonate microanalytical RMs with lower Sr mass fractions. Here, we present a new synthetic carbonate nanopowder RM with a Sr mass fraction of ca. 500 µg g−1 suitable for microanalytical Sr isotope research (‘NanoSr’). NanoSr was analysed by both solution‐based and in situ techniques. Element mass fractions were determined using EPMA (Ca mass fraction), as well as laser ablation and solution ICP‐MS in different laboratories. The 87Sr/86Sr ratio was determined by well‐established bulk methods for Sr isotope measurements and is 0.70756 ± 0.00003 (2s). The Sr isotope microhomogeneity of the material was determined by LA‐MC‐ICP‐MS, which resulted in 87Sr/86Sr ratios of 0.70753 ± 0.00007 (2s) and 0.70757 ± 0.00006 (2s), respectively, in agreement with the solution data within uncertainties. Thus, this new reference material is well suited to monitor and correct microanalytical Sr isotope measurements of low‐Sr, low‐REE carbonate samples. NanoSr is available from the corresponding author.

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confidence: 99%

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

Weber

Lugli

Hattendorf

et al. 2019

Geostandard Geoanalytic Res

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“…A homogenous carbonate standard was not available during this study. Therefore, we recommend that future work to validate this method, with respect to trace elements, should examine the stability of trace element ratios using one of the available homogenous carbonate standards (Weber et al 2018, Jochum et al 2019. The sensitivity of the Element2 sector field ICP-MS, and the low standard error of abundant trace elements for LASS runs across the majority of laser spot sizes, indicate that 87 Sr/ 86 Sr, not trace-elements, is the method most prone to error at small spot sizes within the LASS system.…”

Section: Discussionmentioning

confidence: 99%

Simultaneous determination of⁸⁷Sr/⁸⁶Sr and trace-element data in otoliths and other sclerochronological hard structures

Hegg

Fisher

Vervoort

2020

Preprint

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Chronological data from hard structures has been instrumental in reconstructing information about the past across numerous disciplines. Isotopic and trace elemental chronologies from the depositional layers of speleothems, corals, bivalve shells, fish otoliths and other structures are routinely used to reconstruct climate, growth, temperature, geological, archeological and migratory histories. Advances in instrumentation have revolutionized the use of these structures and publications detailing new chemical and isotopic methods in sclerochronology and speleothem chronology have steadily increased in number. This is particularly true of fish, in which detailed origin, life-history, and migration history can be reconstructed from their otoliths. Specifically, improvements in laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) have allowed increases temporal resolution, precision, and sample throughput. Many studies now combine multiple chemical and isotopic tracers, taking advantage of multivariate statistical methods and multiple tracep-element and isotope systems to glean further information from individual samples. This paper describes a novel laser ablation split-stream (LASS) method which allows simultaneous collection of 87 Sr/ 86 Sr and traceelemental data from chronological carbonate samples. The study tests the accuracy and precision of multiple laser spot sizes on a marine shell standard and fish otoliths using LASS and traditional single stream methods and compared to prior otolith data on the same samples. Our results indicate that LASS techniques can be used to provide accurate and precise data at useful laser spot sizes for otolith studies, while providing time and integration-matched data reduction using newly developed features for the Iolite data reduction platform.

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“…The fs‐LA‐ICP‐MS analyses were performed on 25‐μm‐diameter spots on each chamber with a pulse repetition rate of 15 Hz at low fluence (0.1–0.3 J/cm 2 ). Calibration was performed with the microanalytical synthetic reference material MACS‐3 for carbonate (Jochum et al, 2019) and NIST612 for silica (Jochum et al, 2011). Measurements with fs‐LA‐ICP‐MS yield reproducible results with a relative standard error ~3–4%.…”

Section: Methodsmentioning

confidence: 99%

“…Varying standard deviations comprise analytical uncertainties in the technique and environmental/biological factors such as preservation state of the shell and ontogenetic effect during calcification, respectively (Jochum et al, 2019, and references therein).…”

Section: 1029/2020pa004049mentioning

confidence: 99%

Deep Thermohaline Circulation Across the Closure of the Central American Seaway

Öğretmen

Schiebel

Jochum

et al. 2020

Paleoceanog and Paleoclimatol

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The closure of the Central American Seaway (CAS) resulted in changes of ocean‐climate dynamics since the late Miocene following the uplift of northern Andes. Reconstructing the bottom‐water temperatures (BWTs) of the Caribbean Sea illustrates feedbacks of the closure on the ocean‐climate system including deep‐water dynamics of the Caribbean Sea. Here, Mg/Ca‐derived BWTs of the Plio‐Pleistocene Caribbean Sea from the benthic foraminifer Cibicidoides wuellerstorfi are presented for the first time and interpreted along with Na/Ca and Sr/Ca as proxies of salinity and continental input, respectively. Our results highlight several warm (93, Gi15‐19, and N1) and cool (92, M2, Gi20, and CN4) marine isotope stages (MISs). Accordingly, changes in the circulation of deep‐water masses during the CAS closure developed in four main time intervals: (I) between 5.2 and 4.1 Ma (million years ago) BWT was ~1.1°C, (II) 4.1–3.2 Ma ~2.1°C, (III) 3.2–2.7 Ma ~2.7°C, and (IV) 2.7–2.2 Ma ~2.1°C. Relatively higher, gradually increased temperatures between 3.2 and 2.7 Ma correspond to late Pliocene warmth and restricted inflow of Pacific waters into the Caribbean due to shoaling of the CAS. In addition, Sr/Ca values reveal gradually escalating terrigenous input until 2.7 Ma most likely related to the increased river discharge in response to the Andean uplift. The gradual decrease of the BWTs from 2.7 Ma may have resulted from the onset of Northern Hemisphere Glaciation. Overall, BWTs match with previous sea surface temperatures from the planktic foraminifer Neogloboquadrina dutertrei. The BWTs presented here confirm intensified thermohaline circulation during the overall Pliocene warmth with increased bottom‐water Na/Ca values indicating enhanced salinity.

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Nano‐Powdered Calcium Carbonate Reference Materials: Significant Progress for Microanalysis?

Cited by 59 publications

References 35 publications

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

Simultaneous determination of⁸⁷Sr/⁸⁶Sr and trace-element data in otoliths and other sclerochronological hard structures

Deep Thermohaline Circulation Across the Closure of the Central American Seaway

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Nano‐Powdered Calcium Carbonate Reference Materials: Significant Progress for Microanalysis?

Cited by 59 publications

References 35 publications

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

NanoSr – A New Carbonate Microanalytical Reference Material for In Situ Strontium Isotope Analysis

Simultaneous determination of87Sr/86Sr and trace-element data in otoliths and other sclerochronological hard structures

Deep Thermohaline Circulation Across the Closure of the Central American Seaway

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Simultaneous determination of⁸⁷Sr/⁸⁶Sr and trace-element data in otoliths and other sclerochronological hard structures