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首页> 外文期刊>Geotectonics >Evolution of Stress Fields in the Por'ya Guba Dike Field (Kandalaksha Gulf, White Sea)
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Evolution of Stress Fields in the Por'ya Guba Dike Field (Kandalaksha Gulf, White Sea)

机译：波亚古巴堤防场（白海坎达拉沙海湾）应力场的演变

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摘要

The tectonic evolution of the Por'ya Guba segment of the White Sea Rift System began in the late Paleoproterozoic, i.e., soon after completion of the Svecofennian collision. The fracture system that controlled localization of the lamproite dike complex was formed under conditions of horizontal compression combined with shear. Subsequently, this system predetermined the location of a rift-graben segment that formed as a result of simple shear. The reactivation of the rift system in the Middle Paleozoic proceeded in two stages. The first stage, when strike-slip movements along previously formed faults predominated, resulted in formation of quartz-carbonate veins bearing base-metal mineralization. The veins that filled the shear fractures opened owing to local reorientation of the stress field. The second stage fitted the transtension conditions, and the Late Devonian alkaline ultramafic dikes of this stage intruded into the already existing fracture system, which was oriented at a roughly right angle to the predominant stress orientation.
机译：白海裂谷系统Por'ya Guba地段的构造演化始于古元古代晚期，即Svecofennian碰撞完成后不久。在水平压缩和剪切力共同作用下，形成了控制萤石岩脉络合物局部化的断裂体系。随后，该系统预先确定了由于简单剪切而形成的裂谷段的位置。中古生代裂谷系统的活化分两个阶段进行。第一阶段，当沿先前形成的断层的走滑运动占主导地位时，导致形成了具有贱金属矿化作用的石英碳酸盐岩脉。由于应力场的局部重新定向，充满剪切裂缝的静脉张开了。第二阶段符合张性条件，该阶段的晚期泥盆纪碱性超镁铁岩堤侵入已经存在的裂缝系统中，该裂缝系统与主要应力方向大致成直角。

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