Evidence for late rifting of the Cordilleran margin outlined by stratigraphic division of the Lower Cambrian Gog Group, Rocky Mountain Main Ranges, British Columbia and Alberta
Evidence for late rifting of the Cordilleran margin outlined by stratigraphic division of the Lower Cambrian Gog Group, Rocky Mountain Main Ranges, British Columbia and Alberta
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下寒武统戈格群、落基山脉、不列颠哥伦比亚省和艾伯塔省的地层划分概述了科迪勒拉边缘晚期裂谷的证据
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
P. Simony
中科院分区：
文献类型：
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作者：
W. H. Lickorish;P. Simony
戈格群下寒武统McNaughton组处于下伏上元古界Miette群裂谷相关岩石与上覆古生界被动边缘序列之间的过渡性地层位置。在麦克诺顿组内发现了一个主要的区域不整合，上面覆盖着一个独特的斜长石英岩标志。这种不整合已被证明截断了在麦克诺顿组下部沉积期间活动的正断层。麦克诺顿组下部由活动正断层上盘半地块中堆积的成熟粗粒河流沉积组成。这些断层代表了大陆边缘裂谷作用的最后阶段。这些断裂下盘块体上的不整合可追溯到上盘，并被海侵上McNaughton组的滨面沉积所覆盖。提出将麦克诺顿组正式划分为4个岩石地层段，以描述其岩性特征。
The Lower Cambrian McNaughton Formation of the Gog Group occupies a stratigraphic position transitional between the rift-related rocks of the underlying Upper Proterozoic Miette Group, and the overlying Paleozoic passive margin succession. A major regional unconformity, overlain by a distinctive orthoquartzite marker, has been traced within the McNaughton Formation. This unconformity has been shown to truncate normal faults active during the deposition of the lower McNaughton Formation. The lower McNaughton Formation consists of mature, coarse-grained fluvial sediments accumulated in hanging-wall half-grabens of active normal faults. These faults represent the final stage of rifting on the continental margin. The unconformity on the footwall blocks of these faults can be traced into the hanging wall, and is overlain by the shoreface sediments of the transgressive upper McNaughton Formation. Formal subdivision of the McNaughton Formation into four lithostratigraphic members is proposed, in order to describ...