3 years ago

Effect of growth rate and pH on lithium incorporation in calcite

A. Füger, F. Konrad, A. Leis, M. Dietzel, V. Mavromatis

Publication date: Available online 8 January 2019

Source: Geochimica et Cosmochimica Acta

Author(s): A. Füger, F. Konrad, A. Leis, M. Dietzel, V. Mavromatis


Carbonates are only a minor sink of oceanic lithium, yet the presence of this element and its abundance relative to other metal cations in natural carbonate minerals is routinely used as a paleo-environmental proxy. To date, however, experimental studies on the influence of physicochemical parameters that may control lithium incorporation in calcite, like pH and precipitation rate, are scarce. Therefore, we experimentally studied Li incorporation in calcite to quantify the apparent partitioning coefficient (DLi=cLi/cCacalcitemLi+/mCa2+solution) between calcite and reactive fluid as a function of calcite growth rate and pH. The obtained results suggest that DLi increases with calcite growth rate, according to the expression:LogDLi=1.331(±0.116)×LogRate+6.371(±0.880)(R2=0.87;10-8.1Rate10-7.1molm-2s-1)

Additionally the experimental results suggest that DLi values exhibit a strong pH dependence. For experiments conducted at similar growth rates (i.e. Rate=10-7.7±0.2 mol m-2 s-1), DLi decreases with increasing pH as described by:LogDLi=-0.57(±0.047)×pH+0.759(±0.366)(R2=0.90;6.3<pH<9.5)

The positive correlation of

Publisher URL: https://www.sciencedirect.com/science/article/pii/S001670371930002X

DOI: S001670371930002X

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