Pressure solution is inferred to be a significant contributor to sediment compaction and lithification, especially in carbonate sediments. For a sediment deforming primarily by pressure solution, the compaction rate should be directly related to the rate of calcite dissolution, transport along grain contacts, and calcite reprecipitation. Previous experimental work has shown that there is evidence that deformation in wet calcite grain packs is consistent with control by pressure solution, but considerable ambiguity remains regarding the rate limiting mechanism. We present the results of laboratory compaction experiments designed to directly measure calcite dissolution and precipitation rates (recrystallization rates) concurrently with strain rate to test whether measured rates are consistent with predicted rates both in absolute magnitude and time evolution. Recrystallization rates are measured using trace element chemistry (Sr/Ca, Mg/Ca) and isotopes (87Sr/86Sr) of fluids flowing slowly through a compacting grain pack as it is being triaxially compressed. Imaging techniques are used to characterize the grain contacts and strain effects in the post-experiment grain pack. Our data show that calcite recrystallization rates calculated from all three geochemical parameters are in approximate agreement and that the rates closely track strain rate. The geochemically inferred rates are close to predicted rates in absolute magnitude. Uncertainty in grain contact dimensions makes distinguishing between surface reaction control and diffusion control difficult. Measured reaction rates decrease faster than predicted from standard pressure solution creep flow laws. This inconsistency may indicate that calcite dissolution rates at grain contacts are more complex, and more time-dependent, than suggested by geometric models designed to predict grain contact stresses.

中文翻译：

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同时测量接受压力溶解的方解石颗粒包中的应变和化学反应速率：表面反应控制溶解的证据


据推断，压力溶液是沉积物压实和岩化的重要贡献者，尤其是在碳酸盐沉积物中。对于主要由压力溶液变形的沉积物，压实速率应与方解石溶解、沿颗粒接触传递和方解石再沉淀的速率直接相关。以前的实验工作表明，有证据表明湿方解石颗粒包的变形与压力溶液控制一致，但关于限速机制仍然存在相当大的歧义。我们介绍了实验室压实实验的结果，这些实验旨在直接测量方解石溶解和沉淀速率（再结晶速率）与应变速率同时进行，以测试测量速率是否与绝对大小和时间演变的预测速率一致。再结晶速率是使用微量元素化学成分（Sr/Ca、Mg/Ca）和流体的同位素 （87Sr/86Sr） 测量的，这些流体在被三轴压缩时缓慢流过压实颗粒包。成像技术用于表征实验后谷物包中的晶粒接触和应变效应。我们的数据表明，根据所有三个地球化学参数计算的方解石再结晶速率大致一致，并且这些速率与应变速率密切相关。地球化学推断的速率在绝对星等上接近预测的速率。晶粒接触尺寸的不确定性使得区分表面反应控制和扩散控制变得困难。测得的反应速率下降的速度比标准压力溶液蠕变流定律预测的要快。 这种不一致可能表明，与旨在预测晶粒接触应力的几何模型所建议的相比，晶粒接触处的方解石溶解速率更复杂，并且更依赖于时间。