Strongly peraluminous granites provide independent evidence for an increase in biomass burial across the Precambrian–Phanerozoic boundary

Mikhail, S., Stüeken, E. E., Boocock, T. J., Athey, M., Mappin, N., Boyce, A. J. , Liebmann, J., Spencer, C. J. and Bucholz, C. E. (2024) Strongly peraluminous granites provide independent evidence for an increase in biomass burial across the Precambrian–Phanerozoic boundary. Geology, 52(1), pp. 87-91. (doi: 10.1130/G51800.1)

Abstract

Strongly peraluminous granites (SPGs) are generated by the partial melting of sedimentary rocks and can thus provide a novel archive to reveal secular trends in Earth’s environmental history that integrate siliciclastic sedimentary lithologies. The nitrogen (N) content of Archean, Proterozoic, and Phanerozoic SPGs reveals a systematic increase across the Precambrian−Phanerozoic boundary. This rise is supported by a coeval increase in the phosphorus (P) contents of SPGs. Collectively, these data are most parsimoniously explained by an absolute increase in biomass burial in the late Proterozoic or early Phanerozoic by a factor of ∼5 and as much as 8. The Precambrian−Phanerozoic transition was a time of progressive oxygenation of surface environments paired with major biological innovations, including the rise of eukaryotic algae to ecological dominance. Because oxygenation suppresses biomass preservation in sediments, the increase in net biomass burial preserved in SPGs reveals an expansion of the biosphere and an increase in primary production across this interval.

• Item Type: Articles
• Additional Information: Funding was provided by a UK Natural Environment Research Council (NERC) studentship (NE/R012253/1) to Boocock and a UK National Environmental Isotope Facility access grant (NEIF–2313.0920) to Stüeken, Mikhail, and Boocock. Mikhail was supported by NERC (NE/PO12167/1). Stüeken was supported by NERC (NE/V010824/1).
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Boyce, Professor Adrian
• Authors: Mikhail, S., Stüeken, E. E., Boocock, T. J., Athey, M., Mappin, N., Boyce, A. J., Liebmann, J., Spencer, C. J., and Bucholz, C. E.
• College/School: College of Science and Engineering > Scottish Universities Environmental Research Centre
• Journal Name: Geology
• Publisher: Geological Society of America
• ISSN: 0091-7613
• ISSN (Online): 1943-2682
• Published Online: 17 November 2023