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Volume 33 Issue 1
Feb 2022
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Jin Li, Xiangkun Zhu, Suohan Tang. Assessment of Different Digestion Procedures for Mo Isotope Measurements of Black and Grey Shales Using the Double Spike Technique. Journal of Earth Science, 2022, 33(1): 76-81. doi: 10.1007/s12583-021-1520-1
Citation: Jin Li, Xiangkun Zhu, Suohan Tang. Assessment of Different Digestion Procedures for Mo Isotope Measurements of Black and Grey Shales Using the Double Spike Technique. Journal of Earth Science, 2022, 33(1): 76-81. doi: 10.1007/s12583-021-1520-1

Assessment of Different Digestion Procedures for Mo Isotope Measurements of Black and Grey Shales Using the Double Spike Technique

doi: 10.1007/s12583-021-1520-1
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  • Corresponding author: Xiangkun Zhu, xiangkun@cags.ac.cn
  • Received Date: 02 Feb 2021
  • Accepted Date: 26 Jul 2021
  • Publish Date: 28 Feb 2022
  • This study investigates the behavior of Mo and Mo isotopes (δ98Mo) in shales following leaching with HCl and HNO3 with the aim of simplifying the shale dissolution procedure. Up to 6% of the Mo was lost and the Mo isotopes were unaffected when shales were leached using 9 M HCl after ashing. Bulk sample digestion or leaching by 4 M or more concentrated HCl after ashing were all found to be acceptable and reliable approaches to the analysis of Mo isotopes in shales. After black shale (CAGS-BS) was leached with 2 M HCl, 1 M HCl, and 9 M HNO3, the Mo concentration ([Mo]) in the leachate was lower and δ98Mo was heavier than that obtained from bulk digestion. A Mo isotope mass-balance model showed that the δ98Mo in the residues was lighter than the δ98Mo from the bulk digestion of CAGS-BS and of crustal igneous rocks. No more Mo was lost, nor did Mo isotope fractionation, if the double spike was added before rather than after ashing and followed by bulk digestion or leaching with 9 M HCl. For efficiency, leaching using 4 M or more concentrated HCl after ashing is preferred for Mo isotope measurements.

     

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  • Algeo, T. J., Maynard, J. B., 2004. Trace-Element Behavior and Redox Facies in Core Shales of Upper Pennsylvanian Kansas-Type Cyclothems. Chemical Geology, 206(3/4): 289-318. https://doi.org/10.1016/j.chemgeo.2003.12.009
    Barling, J., Arnold, G. L., Anbar, A. D., 2001. Natural Mass-Dependent Variations in the Isotopic Composition of Molybdenum. Earth and Planetary Science Letters, 193(3/4): 447-457. https://doi.org/10.1016/S0012-821x(01)00514-3
    Dahl, T. W., Ruhl, M., Hammarlund, E. U., et al., 2013. Tracing Euxinia by Molybdenum Concentrations in Sediments Using Handheld X-Ray Fluorescence Spectroscopy (HHXRF). Chemical Geology, 360/361: 241-251. https://doi.org/10.1016/j.chemgeo.2013.10.022
    Dahl, T. W., Wirth, S. B., 2017. Molybdenum Isotope Fractionation and Speciation in a Euxinic Lake—Testing Ways to Discern Isotope Fractionation Processes in a Sulfidic Setting. Chemical Geology, 460: 84-92. https://doi.org/10.1016/j.chemgeo.2017.04.018
    Dickson, A. J., Idiz, E., Porcelli, D., et al., 2020. The Influence of Thermal Maturity on the Stable Isotope Compositions and Concentrations of Molybdenum, Zinc and Cadmium in Organic-Rich Marine Mudrocks. Geochimica et Cosmochimica Acta, 287: 205-220. https://doi.org/10.1016/j.gca.2019.11.001
    Gaspers, N., Magna, T., Ackerman, L., 2020. Molybdenum Mass Fractions and Stable Isotope Compositions of Sedimentary Carbonate and Silicate Reference Materials. Geostandards and Geoanalytical Research, 44(2): 363-374. https://doi.org/10.1111/ggr.12314
    Goldberg, T., Archer, C., Vance, D., et al., 2009. Mo Isotope Fractionation during Adsorption to Fe(Oxyhydr) Oxides. Geochimica et Cosmochimica Acta, 73(21): 6502-6516. https://doi.org/10.1016/j.gca.2009.08.004
    Goldberg, T., Gordon, G., Izon, G., et al., 2013. Resolution of Inter-Laboratory Discrepancies in Mo Isotope Data: An Intercalibration. Journal of Analytical Atomic Spectrometry, 28(5): 724-735. https://doi.org/10.1039/c3ja30375f
    Gordon, G. W., Lyons, T. W., Arnold, G. L., et al., 2009. When do Black Shales Tell Molybdenum Isotope Tales?. Geology, 37(6): 535-538. https://doi.org/10.1130/g25186a.1
    Helz, G. R., Miller, C. V., Charnock, J. M., et al., 1996. Mechanism of Molybdenum Removal from the Sea and Its Concentration in Black Shales: EXAFS Evidence. Geochimica et Cosmochimica Acta, 60(19): 3631-3642. https://doi.org/10.1016/0016-7037(96)00195-0
    Herrmann, A. D., Kendall, B., Algeo, T. J., et al., 2012. Anomalous Molybdenum Isotope Trends in Upper Pennsylvanian Euxinic Facies: Significance for Use of δ98Mo as a Global Marine Redox Proxy. Chemical Geology, 324/325: 87-98. https://doi.org/10.1016/j.chemgeo.2012.05.013
    Kendall, B., Creaser, R. A., Gordon, G. W., et al., 2009. Re-Os and Mo Isotope Systematics of Black Shales from the Middle Proterozoic Velkerri and Wollogorang Formations, McArthur Basin, Northern Australia. Geochimica et Cosmochimica Acta, 73(9): 2534-2558. https://doi.org/10.1016/j.gca.2009.02.013
    Kurzweil, F., Wille, M., Schoenberg, R., et al., 2015. Continuously Increasing δ98Mo Values in Neoarchean Black Shales and Iron Formations from the Hamersley Basin. Geochimica et Cosmochimica Acta, 164: 523-542. https://doi.org/10.1016/j.gca.2015.05.009
    Li, J., Zhu, X. K., Tang, S. H., et al., 2016. High-Precision Measurement of Molybdenum Isotopic Compositions of Selected Geochemical Reference Materials. Geostandards and Geoanalytical Research, 40(3): 405-415. https://doi.org/10.1111/j.1751-908x.2015.00369.x
    Liermann, L. J., Mathur, R., Wasylenki, L. E., et al., 2011. Extent and Isotopic Composition of Fe and Mo Release from Two Pennsylvania Shales in the Presence of Organic Ligands and Bacteria. Chemical Geology, 281(3/4): 167-180. https://doi.org/10.1016/j.chemgeo. 2010.12.005 doi: 10.1016/j.chemgeo.2010.12.005
    Malinovsky, D., Rodushkin, I., Baxter, D. C., et al., 2005. Molybdenum Isotope Ratio Measurements on Geological Samples by MC-ICPMS. International Journal of Mass Spectrometry, 245(1/2/3): 94-107. https://doi.org/10.1016/j.ijms.2005.07.007
    McLennan, S. M., 2001. Relationships between the Trace Element Composition of Sedimentary Rocks and Upper Continental Crust. Geochemistry, Geophysics, Geosystems, 2(4): e2000gc000109. https://doi.org/10.1029/2000gc000109
    Nägler, T. F., Anbar, A. D., Archer, C., et al., 2014. Proposal for an International Molybdenum Isotope Measurement Standard and Data Representation. Geostandards and Geoanalytical Research, 38(2): 149-151. https://doi.org/10.1111/j.1751-908x.2013.00275.x
    Nägler, T. F., Neubert, N., Böttcher, M. E., et al., 2011. Molybdenum Isotope Fractionation in Pelagic Euxinia: Evidence from the Modern Black and Baltic Seas. Chemical Geology, 289(1/2): 1-11. https://doi.org/10.1016/j.chemgeo.2011.07.001
    Nägler, T. F., Siebert, C., Lüschen, H., et al., 2005. Sedimentary Mo Isotope Record across the Holocene Fresh-Brackish Water Transition of the Black Sea. Chemical Geology, 219(1/2/3/4): 283-295. https://doi.org/10.1016/j.chemgeo.2005.03.006
    Neubert, N., Nägler, T. F., Böttcher, M. E., 2008. Sulfidity Controls Molybdenum Isotope Fractionation into Euxinic Sediments: Evidence from the Modern Black Sea. Geology, 36(10): 775-778. https://doi.org/10.1130/g24959a.1
    Ostrander, C. M., Sahoo, S. K., Kendall, B., et al., 2019. Multiple Negative Molybdenum Isotope Excursions in the Doushantuo Formation (South China) Fingerprint Complex Redox-Related Processes in the Ediacaran Nanhua Basin. Geochimica et Cosmochimica Acta, 261: 191-209. https://doi.org/10.1016/j.gca.2019.07.016
    Pearce, C. R., Cohen, A. S., Parkinson, I. J., 2009. Quantitative Separation of Molybdenum and Rhenium from Geological Materials for Isotopic Determination by MC-ICP-MS. Geostandards and Geoanalytical Research, 33(2): 219-229. https://doi.org/10.1111/j.1751-908x.2009.00012.x
    Rudge, J. F., Reynolds, B. C., Bourdon, B., 2009. The Double Spike Toolbox. Chemical Geology, 265(3/4): 420-431. https://doi.org/10.1016/j.chemgeo.2009.05.010
    Scott, C., Lyons, T. W., 2012. Contrasting Molybdenum Cycling and Isotopic Properties in Euxinic versus Non-Euxinic Sediments and Sedimentary Rocks: Refining the Paleoproxies. Chemical Geology, 324/325: 19-27. https://doi.org/10.1016/j.chemgeo.2012.05.012
    Scott, C., Lyons, T. W., Bekker, A., et al., 2008. Tracing the Stepwise Oxygenation of the Proterozoic Ocean. Nature, 452(7186): 456-459. https://doi.org/10.1038/nature06811
    Siebert, C., Nägler, T. F., von Blanckenburg, F., et al., 2003. Molybdenum Isotope Records as a Potential New Proxy for Paleoceanography. Earth and Planetary Science Letters, 211(1/2): 159-171. https://doi.org/10.1016/s0012-821x(03)00189-4
    Voegelin, A. R., Nägler, T. F., Pettke, T., et al., 2012. The Impact of Igneous Bedrock Weathering on the Mo Isotopic Composition of Stream Waters: Natural Samples and Laboratory Experiments. Geochimica et Cosmochimica Acta, 86: 150-165. https://doi.org/10.1016/j.gca.2012.02.029
    Wang, Z. C., Becker, H., Wombacher, F., 2015. Mass Fractions of S, Cu, Se, Mo, Ag, Cd, In, Te, Ba, Sm, W, Tl and Bi in Geological Reference Materials and Selected Carbonaceous Chondrites Determined by Isotope Dilution ICP-MS. Geostandards and Geoanalytical Research, 39(2): 185-208. https://doi.org/10.1111/j.1751-908x.2014.00312.x
    Zhao, P. P., Li, J., Zhang, L., et al., 2016. Molybdenum Mass Fractions and Isotopic Compositions of International Geological Reference Materials. Geostandards and Geoanalytical Research, 40(2): 217-226. https://doi.org/10.1111/j.1751-908x.2015.00373.x
    Zhou, L., Zhou, H. -B., Li M., et al., 2007. Molybdenum Isotope Signatures from Yangtze Craton Continental Margin and Its Indication to Organic Burial Rate. Earth Science, 16(6): 759-766 (in Chinese with English Abstract) http://d.wanfangdata.com.cn/Periodical_zggdxxxswz-dqkx200704005.aspx
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