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首页> 外文期刊>Canadian journal of earth sciences >Structure of the Archean English River subprovince: implications for the tectonic evolution of the western Superior Province, Canada
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Structure of the Archean English River subprovince: implications for the tectonic evolution of the western Superior Province, Canada

机译：太古英语河次省的结构：对加拿大西部上级省的构造演化的启示

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摘要

The English River subprovince is one of two metasediment-dominated terranes in the western Superior Province. It has been interpreted as an accretionary complex, a foreland, or a fore-arc basin that developed and was subsequently deformed between the metavolcanic-rich Uchi subprovince and the orthogneiss- and metaplutonic-dominated Winnipeg River subprovince during a prolonged transpressive orogeny. To test these hypotheses, we combined a satellite image, aeromagnetic image, and Lithoprobe reflection seismic profile interpretation with detailed structural mapping to better characterize the internal geometry and significance of structural features in the western part of the subprovince in Ontario. Northward-directed subduction and collision of the Winnipeg River subprovince with the Uchi subprovince at ca. >2713-2698 Ma can account for the deposition of the sedimentary rocks, initial metamorphism, and the main phase of deformation in the subprovince, whereas the subduction of Wabigoon crust generated extensive tonalite magmatism in the Winnipeg River and English River subprovinces during the same period. A period of extension, after the docking of the Winnipeg River and Wabigoon subprovinces at ca. 2698 Ma, punctuated the compressive phases of the orogeny and was responsible for high-grade metamorphism, upward bending of the Moho, and localized deposition of late, coarse, alluvial-fluvial metasedimentary rocks. Renewed compression caused by the docking of the Wawa subprovince at ca. 2689-2684 Ma is likely responsible for a largely unrecognized regional upright folding and faulting event that controls the dominant structural geometry of the subprovince. Late in its tectonic evolution, strain was partitioned into dextral deformation that was strongly domainal and limited to the subprovince margins.
机译：英吉利河省是西部优越省西部两个以沉积物为主的地层之一。它被解释为增生复合体，前陆或前弧盆地，并在长时间的超压造山作用期间在富火山的Uchi子省与以斜长片岩体和偏深成岩作用的温尼伯河省之间发展并随后发生了变形。为了检验这些假设，我们将卫星图像，航空磁图像和Lithoprobe反射地震剖面解释与详细的结构映射相结合，以更好地表征安大略省副省西部的内部几何形状和结构特征的重要性。温尼伯河子省和内河县的北向俯冲和碰撞。 > 2713-2698 Ma可以解释该省的沉积岩沉积，初始变质作用和变形的主要阶段，而Wabigoon地壳的俯冲作用则在同一时期在温尼伯河和英吉利河次省产生了广泛的方钠石岩浆作用。 。温尼伯河和瓦比贡次大陆对接后，延长了一段时期。 2698 Ma，穿插了造山带的压缩相，造成了高级变质作用，莫霍面的向上弯曲以及后期较粗的冲积河流冲积沉积岩的局部沉积。 Wawa的对接点在大约1米处造成了新的压缩。 2689-2684 Ma可能是很大程度上无法识别的区域直立折叠和断裂事件的原因，该事件控制了该省的主要结构几何。在构造演化的后期，应变被划分为右旋变形，该变形强烈地局限在亚省边缘。

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