Investigating the effects of growth rate and temperature on the B/Ca ratio and δ11B during inorganic calcite formation

Investigating the effects of growth rate and temperature on the B/Ca ratio and δ11B during inorganic calcite formation
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研究无机方解石形成过程中生长速率和温度对 B/Ca 比率和 Ύ´11B 的影响

DOI:
10.1016/j.chemgeo.2015.12.002
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发表时间:
2016
期刊:
影响因子:
3.9
通讯作者:
J. Bijma
J. Bijma
中科院分区:
地球科学2区
文献类型:
--
作者:
Kaczmarek;Nehrke;Elderfield;J. Bijma

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To deconvolve the effect of growth rate and temperature on the boron partitioning into calcite and its isotope fractionation, seeded calcite precipitation experiments were performed at a constant temperature and various growth rates and at a constant growth rate and various temperatures. We show that boron partitioning increases with increasing growth rate and decreases with increasing temperature. The B isotope fractionation between calcite and B(OH)4−increases with increasing growth rate favoring the lighter B isotope for incorporation into calcite whereas no effect of temperature was observed within the temperature range investigated (12 °C to 32 °C). At the lowest temperature and growth rate δ11B of the calcite almost equals that of B(OH)4−in solution. Applying the surface entrapment model (SEMO) of Watson and Liang (1995) to our data, we demonstrate that the observed effects of temperature and growth rate on B concentration can be explained by processes in the near surface layer of the calcite crystal.
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