Reliable information on past environmental and climatic conditions is crucial for understanding the evolution of life and the Earth System as a whole. Skeletal components of marine or aquatic organisms are among the most important and widely-used natural archives capturing information about the environment and fluid chemistry during precipitation in the form of geochemical signatures and/or specific mineralogies or micromorphologies. Over the past decades, a refined understanding of (bio)mineralisation, together with the development of new isotopic and elemental proxies (e.g. clumped isotopes Δ47, boron isotopes δ11B, or elemental ratios such as Li/Mg), has led to numerous breakthroughs in palaeoclimate research (e.g. on the evolution of seawater chemistry, causes and consequences of mass extinctions, or greenhouse vs. icehouse climate sensitivities). Simultaneously, geochemical, petrographic and crystallographic approaches have brought novel insights into (bio)mineral formation processes and alteration pathways of a variety of organisms. Critically, however, our knowledge of the incorporation of elements into the crystal lattice, and the quality and reliability of extracted climatic and environmental records, depends on careful proxy calibrations, and evaluation of secondary controls such as kinetic or vital effects and diagenetic influences.
This session seeks contributions on geochemical proxy development, including but not limited to new proxies, calibrations, modelling frameworks, and analytical or methodological advances. We invite experimental and observational studies dealing with biogenic but also inorganic mineral precipitation, transformation and alteration, including interface geochemistry, geomicrobiology or new perspectives on biomineralisation from culturing of calcifying organisms. We also welcome examples on how mechanistic understanding of marine or terrestrial carbonates and/or application of novel approaches results in an improved understanding of the global carbon(ate) cycle and Earth history. The aim of this session is to synthesize recent advances in geochemistry and (bio)mineralisation to further palaeo-proxy development and application that will result in a comprehensive understanding of past global changes.
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