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Andrew Jacobson

Professor, Director of Graduate Studies, and Faculty Affiliate, Trienens Institute for Sustainability and Energy

Ph.D. Geological Sciences, University of Michigan, Ann Arbor
M.S. Earth Sciences, Dartmouth College
B.A. Earth Sciences and Chemistry, University of California, Santa Cruz

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Research

Andrew D. Jacobson research comprises radiogenic isotope geochemistry, low-temperature aqueous geochemistry, calcium isotopes, strontium isotopes, carbonate geochemistry, Earth surface processes, chemical weathering, long-term carbon cycle, paleoceanography, paleoclimatology, and decarbonization.

His laboratory specializes in the high-precision analysis of stable calcium and strontium isotope abundance variations (δ44/40Ca and δ88/86Sr) by thermal ionization mass spectrometry (TIMS). Group members apply these measurements to diverse problems ranging from paleoclimate reconstructions to basalt weathering. Many projects have implications for emerging decarbonization technologies designed to mitigate the anthropogenic climate crisis, including ocean alkalinity enhancement, enhanced rock weathering, and carbon mineralization at elevated temperatures.

Teaching

EARTH 201: Earth Systems Revealed (Introductory Geology)
EARTH 310: Aqueous Geochemistry 
EARTH 313: Radiogenic Isotope Geochemistry 
EARTH 344: The Scientific Foundations of Decarbonization

Selected Publications

 

Wang J., Jacobson A. D., Sageman B. B., and Hurtgen M. T. (2023) Application of the δ44/40Ca-δ88/86Sr multi-proxy to Namibian Marinoan cap carbonates. Geochimica et Cosmochimica Acta 353, 13-27.

Wang J., Tarhan L. G., Jacobson A. D., Oehlert A. M., and Planavsky N. J. (2023) The evolution of the marine carbonate factory. Nature 615, 265–269.

Jones M. M., Sageman B. B., Selby D., Jacobson A. D., Batenburg S. J., Riquier L., MacLeod K. G., Huber B. T., Bogus K. A., Tejada M. L. G., Kuroda J., and Hobbs R. W. (2023) Abrupt episode of mid-Cretaceous ocean acidification triggered by massive volcanism. Nature Geoscience 16, 169–174.

Kitch G. D., Jacobson A. D., Sageman B. B., Coccioni R., Chung-Swanson T.*, Ankney M. E., and Hurtgen M. T., (2022) Calcium isotope ratios of malformed foraminifera reveal biocalcification stress preceded Oceanic Anoxic Event 2. Communications Earth & Environment 3, 315.

Nelson C., Jacobson A. D., Kitch G. D., and Weisenberger T. B. (2021) Large calcium isotope fractionations by zeolite minerals from Iceland. Communications Earth & Environment. DOI: 10.1038/s43247-021-00274-9.

Wang J., Jacobson A. D., Sageman B. B., and Hurtgen M. T. (2021) Stable Ca and Sr isotopes support volcanically-triggered biocalcification crisis during Oceanic Anoxic Event 1a. Geology, 49, 515-519.

Linzmeier B. J., Jacobson A. D., Sageman B. B., Hurtgen M. T., Ankney M. E., Petersen S. V., Tobin T. S., Kitch G. D., and Wang J. (2020) Calcium isotope evidence for environmental variability before and across the Cretaceous-Paleogene mass extinction. Geology, 38, 34-38.

Jacobson A. D., Andrews M. G., Lehn G. O., and Holmden C. (2015) Silicate versus carbonate weathering in Iceland: New insights from Ca isotopes. Earth and Planetary Science Letters, 416, 132-142.