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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Reaction-assisted hierarchical fracturing during serpentinization
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Reaction-assisted hierarchical fracturing during serpentinization

机译：蛇纹石化过程中的反应辅助分层压裂

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摘要

Hierarchical fracture patterns are the result of a fracturing process that successively divides rocks into smaller domains. In a 2D (outcrop) section such fracture patterns are characterized by four sided domains, and T-junctions where new fractures stop growing at right angles to preexisting fractures. Here, we describe fracturing of mm to din thick serpentinized orthopyroxenite dykes in a dunite matrix from the Leka Ophiolite Complex in Nord-Trondelag, Norway. The fracturing process is driven by volume changes associated with the serpentinization of the dunites. During this process the orthopyroxenite dykes are extended by the expanding dunite and undergo considerable fracturing. The resulting fracture patterns are hierarchical. The cumulative distributions of fracture lengths show a scaling behavior that lies between a log-normal and power law (fractal) distribution. This is consistent with a simple fragmentation model in which domains are divided according to a 'top hat' distribution of new fracture positions within unfractured domains. Reaction-assisted hierarchical fracturing is also likely to be responsible for other structures commonly observed in serpentinized ultramafic rocks, including the mesh-textures observed in individual olivine grains, and the high abundance of rectangular domains at a wide range of scales. This mechanism may provide first-order controls on fluid migration rates in a wide variety of geological settings.
机译：分层裂缝模式是将岩石依次分成较小区域的压裂过程的结果。在2D（露头）剖面中，这种裂缝模式的特征是四个侧面区域和T形接头，其中新的裂缝与已存在的裂缝成直角停止生长。在这里，我们描述了从挪威北特隆德拉格（Nord-Trondelag）的Leka蛇绿岩复合体中的Dunite基质中，将mm断裂为​​厚的蛇纹石化的正辉石岩堤。压裂过程是由与单位蛇形化相关的体积变化驱动的。在此过程中，原辉石岩堤由膨胀的榴辉岩伸展并发生相当大的破裂。最终的断裂模式是分层的。裂缝长度的累积分布显示出在对数正态分布和幂定律（分形）分布之间的缩放行为。这与简单的碎裂模型相一致，在该模型中，根据未破裂区域内新裂缝位置的“高帽”分布来划分区域。反应辅助的分层压裂也可能是造成蛇纹石化的超镁铁质岩石中常见的其他结构的原因，包括在单个橄榄石晶粒中观察到的网状结构，以及在各种尺度下都具有高丰度的矩形区域。这种机制可以在多种地质环境中对流体运移速率提供一阶控制。

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