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首页> 外文期刊>Contributions to Mineralogy and Petrology >Dehydration reactions and microanostructures in experimentally-deformed serpentmites
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Dehydration reactions and microanostructures in experimentally-deformed serpentmites

机译：实验变形蛇形虫的脱水反应和微观/纳米结构

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High-T torsion experiments on lizardite + chrysotile serpentinites produced mineralogical and micro/ nanostructural changes, with important implications in rheological properties. High-resolution TEM showed that specimens underwent ductile [by microkinking and (001) interlayer glide] and brittle deformation (by microfractur-ing), together with dehydration and break-down reactions. Lizardite is affected by polytypic disorder and microkinking [kink axial planes at high angle with respect to (001) planes], that were not present in the initial ordered lT-lizardite. Chrysotile fibres are deformed, resulting in elliptical cross-sections, with strong loss of interlayer cohesion. Both lizardite and chrysotile break down to a fine intergrowth of olivine (up to 200 nm), talc (up to 30 nm) and poorly-crystalline material. Lizardite-out reaction preferentially occurs at kink axial planes, representing sites of preferential strain and enhanced reactivity; conversely, chrysotile break-down is a bulk process, resulting in large healed olivine aggregates, up to micrometric in size. Overall observations suggest that dehydration and breakdown reactions are more advanced in chrysotile than in lizardite.
机译：蜥蜴石+温石棉蛇纹石的高T扭转实验产生了矿物学和微观/纳米结构的变化，对流变性质具有重要意义。高分辨率TEM显示，标本经历了延性[通过微扭结和（001）层间滑移]和脆性变形（通过微断裂），以及脱水和分解反应。蜥蜴石受多型性紊乱和微扭折[相对于（001）平面成高角度的扭折轴向平面）的影响，这在最初的有序IT蜥蜴石中不存在。温石棉纤维变形，形成椭圆形横截面，层间内聚力大大降低。蜥蜴石和温石棉都分解为橄榄石（最大200 nm），滑石（最大30 nm）和结晶度较差的材料的良好共生体。蜥蜴石出反应优先发生在扭结轴向平面，代表优先应变和增强反应性的位点。相反，温石棉分解是一个整体过程，导致愈合的橄榄石聚集体大到微米大小。总体观察结果表明，温石棉中的脱水和分解反应比蜥蜴石中的脱水和分解反应更先进。

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