Experimental calcite dissolution under stress: Evolution of grain contact microstructure during pressure solution creep
Experimental calcite dissolution under stress: Evolution of grain contact microstructure during pressure solution creep
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DOI：
10.1029/2010jb000869
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发表时间：
2010-09
影响因子：
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通讯作者：
D. Croizé;François Renard;K. Bjørlykke;D. Dysthe
中科院分区：
文献类型：
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作者：
D. Croizé;François Renard;K. Bjørlykke;D. Dysthe
[1]首次比较了原位和非原位纳米分辨率技术在应力作用下方解石溶解研究中的应用。所获得的结果使识别的相对重要性的压力溶液驱动的正常负载和自由表面溶解驱动的应变能。结果表明，方解石晶体在颗粒尺度上的压溶是通过两种不同的机制发生的。溶解的固体的扩散发生在粗糙的方解石/压头接口，或通过裂纹，从接触向应力较小的部分的晶体传播。还发现应变速率主要是活动过程的函数，即，压力解与裂纹有关或无关，而不受应力变化的影响。在这项研究中获得的应变速率与已发表的实验方解石和碳酸盐溶解应力下的数据一致。
[1] For the first time, nanometer resolution techniques both in situ and ex situ were compared in order to study calcite dissolution under stress. The obtained results enabled identification of the relative importance of pressure solution driven by normal load and free surface dissolution driven by strain energy. It is found that pressure solution of calcite crystals at the grain scale occurred by two different mechanisms. Diffusion of the dissolved solid took place either at a rough calcite/indenter interface, or through cracks that propagated from the contact toward the less stressed part of the crystal. It is also found that strain rates are mostly a function of the active process, i.e., pressure solution associated or not with cracks, rather than being influenced by stress variations. Strain rates obtained in this study are in agreement with published data of experimental calcite and carbonate dissolution under stress.