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Temperature-induced amorphization in CaCO3 at high pressure and implications for recycled CaCO3 in subduction zones.
Nature Communications ( IF 14.7 ) Pub Date : 2019-04-29 , DOI: 10.1038/s41467-019-09742-5
Mingqiang Hou 1, 2 , Qian Zhang 1 , Renbiao Tao 3 , Hong Liu 4 , Yoshio Kono 5, 6 , Ho-Kwang Mao 1, 3 , Wenge Yang 1 , Bin Chen 1 , Yingwei Fei 3
Affiliation  

Calcium carbonate (CaCO3) significantly affects the properties of upper mantle and plays a key role in deep carbon recycling. However, its phase relations above 3 GPa and 1000 K are controversial. Here we report a reversible temperature-induced aragonite-amorphization transition in CaCO3 at 3.9-7.5 GPa and temperature above 1000 K. Amorphous CaCO3 shares a similar structure as liquid CaCO3 but with much larger C-O and Ca-Ca bond lengths, indicating a lower density and a mechanism of lattice collapse for the temperature-induced amorphous phase. The less dense amorphous phase compared with the liquid provides an explanation for the observed CaCO3 melting curve overturn at about 6 GPa. Amorphous CaCO3 is stable at subduction zone conditions and could aid the recycling of carbon to the surface.

中文翻译:

CaCO3在高压下温度诱导的非晶化及其对俯冲带中回收的CaCO3的影响。

碳酸钙(CaCO3)会显着影响上地幔的性质,并在深度碳循环中起关键作用。但是,其高于3 GPa和1000 K的相位关系是有争议的。在这里,我们报告了在3.9-7.5 GPa和高于1000 K的温度下CaCO3中可逆的温度诱导文石非晶化转变。非晶CaCO3与液体CaCO3具有相似的结构,但具有更大的CO和Ca-Ca键长,表明密度较低以及温度诱导的非晶相的晶格坍塌机理。与液体相比,密度较小的非晶相为观察到的CaCO3熔融曲线在约6 GPa时的倾覆提供了解释。非晶态CaCO3在俯冲带条件下是稳定的,可以帮助将碳再循环到地表。
更新日期:2019-05-16
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