Publications

Peer-reviewed published articles

Ahm, A-S. C., Bjerrum, C.J., Hoffman, P.F., Macdonald, F.A., Maloof, A.C., Rose, C.V., Strauss, J.V., Higgins, J.A. The Ca and Mg isotope record of the Cryogenian Trezona carbon isotope excursion. Earth and Planetary Science Letters V568, 117002, 2021. https://doi.org/10.1016/j.epsl.2021.117002 (download pdf)

Nelson, L. L., Ahm, A-S. C., Macdonald, F. A., Higgins, J. A., Smith, E. F., Fingerprinting local controls on the Neoproterozoic carbon cycle with the isotopic record of Cryogenian carbonates in the Panamint Range, California. Earth and Planetary Science Letters, 566, 116956, 2021. doi.org/10.1016/j.epsl.2021.116956 (download pdf)

Crockford, P.W, Kunzmann, M., Blättler, C.B., Boriana K-A., Murphy, J.G., Ahm, A-S. C., Sharoni, S., Halverson, G.P., Planavsky, N.J., Halvey, I., Higgins, J.A. Reconstricting Neoproterozoic seawater chemistry from early diagenetic dolomite. Geology, v. 49, 2020, doi.org/10.1130/G48213.1 (download pdf)

Bold, U., Ahm, A-S. C., Schrag, D. P., Higgins, J. A., Jamsran, E., Macdonald, F. A., Effect of dolomitization on isotopic records in Neoproterozoic carbonates of southwestern Mongolia. Precambrian Geology, 350, 2020, doi.org/10.1016/j.precamres.2020.105902 (download pdf)

Gussone, N., Ahm, A-S. C., Lau, K. V., Bradbury, H. J., Calcium isotopes in deep time: Potential and limitations, Chemical Geology, 544, 2020, doi.org/10.1016/j.chemgeo.2020.119601 (download pdf)

Jones, D. S., Brothers, W. R., Ahm, A-S. C., Slater, N., Higgins, J. A., Fike, D. A., Sea level, carbonate mineralogy, and early diagenesis controlled δ¹³C records in Upper Ordovician carbonates, Geology, 48, 194-199, 2020, doi.org/10.1130/G46861.1 (download pdf)

Crockford, P. W., Wing, B. A., Paytan, A., Hayles, J. A., Middleton, J., Torres, M., Ahm, A-S. C., Caxito, F., Uhlein, G., Halverson, G. P., Horner, T. J., Barium-isotopic constraints on the origin of post-Marinoan barites, Earth and Planetary Science Letters, 519, 234-244, 2019, doi.org/10.1016/j.epsl.2019.05.018 (download pdf)

Ahm, A-S. C., Maloof, A. C., Macdonald, F. A., Hoffman, P. F., Bjerrum C. J., Bold, U., Rose, C. V., Strauss, J. V., Higgins, J. A., An early diagenetic deglacial origin for basal Ediacaran cap dolostones, Earth and Planetary Science Letters, 506C, 292-307, 2019, doi.org/10.1016/j.epsl.2018.10.046 (download pdf)

Ahm, A-S. C., Bjerrum, C. J., Blättler, C. L., Swart, P. K., Higgins, J. A., Quantifying early marine diagenesis in shallow water carbonate sediments, Geochimica et Cosmochimica Acta, 236, 140-159, 2018, doi.org/10.1016/j.gca.2018.02.042 (download pdf)

Higgins, J. A., Blättler, C. L., Lundstrom, E. A., Santiago-Ramos, D. P., Akhtar, A. A., Ahm, A-S. C., Bialik, O., Holmden, C., Bradbury, H., Murray, S. T., Swart, P. K., Mineralogy, early marine diagenesis, and the chemistry of shallow-water carbonate sediments, Geochimica et Cosmochimica Acta, 220, 512-534, 2018, doi.org/10.1016/j.gca.2017.09.046 (download pdf)

Ahm, A-S. C., Bjerrum C. J., Hammarlund, E. U., Disentangling the record of diagenesis, local redox conditions, and global seawater chemistry during the latest Ordovician glaciation, Earth and Planetary Science Letters, 459, 145-156, 2017, doi.org/10.1016/j.epsl.2016.09.049 (download pdf)

Manuscripts in review/pre-prints

Ahm, A-S. C., Husson, J.M., Local and global controls on carbon isotope chemostratigraphy. Submitted to Cambridge Elements. Preprint available on www.eartharxiv.org doi.org/10.31223/X5V607 (download preprint)

Farrell, U.C., ... Ahm, A-S. C., ...Sperling, E.A., The Sedimentary Geochemistry and Paleoenvironments Project. Submitted to Geobiology.

Akhtar, A. A., Ahm, A-S. C., Higgins, J. A., Mixed marine and meteoric early diagenetic alteration of shallow water carbonate sediments: insights from paired δ^44/40Ca and δ²⁶Mg values. Manuscript in preparation.

Busch, J.F., Hodgin, E.B., Ahm, A-S. C., Husson, J.M., Macdonald, F.A., Bergmann, K.D., Higgins, J.A., Strauss, J.V. Ediacaran Shuram carbon isotope excursion as a global oceanographic event. Manuscript in preparation.