Pavel Kabanov, Keith Dewing, E.A. Atkinson, R. D. VandenBerg
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The upper Kitson represents basinal toes of westward prograding DCW clinoforms. The Blackley and Cape de Bray formations of Embry and Klovan (1976) are not traceable enough to warrant their formation rank. We revert to the original usage of Tozer and Thorsteinsson (1964) where these units are members within the Weatherall Formation. The distinctive seismic character of the Cape de Bray in western and central Melville Island warrants its recognition as a formal member; elsewhere it is informal as it cannot be consistently traced. The Blackey is treated as a formal member in an outcrop area of ⁓2000 km2 where it was defined; it is not recognized in the subsurface. 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引用次数: 0
摘要
利用遗留的地震数据和钻孔芯片样本的 XRF 勘测,对研究区域的泥盆纪碎屑楔(DCW)和下伏碳酸盐平台及基底泥岩进行了重新研究。梅尔维尔岛的奥陶纪-泥盆纪基底演替在西北地区被整合为伊贝特湾组,而努纳武特地区的相应地层则被整合为菲利普斯角地层。Kitson Formation 黑色页岩与上伊贝特湾组相关。在奥陶系-德文系地层中,有六个具有高总有机碳和高伽马响应的地层,其中第四个地层(4a)接近志留纪/德文系边界;上面两个地层(4b、5)分别是埃姆西亚和埃菲尔西亚地层。在渐变方向上,Kitson 地层的基底从伽马层 4a 向 5 层上升。Kitson地层上部代表了DCW地块向西递变的基底趾部。Embry和Klovan(1976年)的Blackley地层和Cape de Bray地层没有足够的可追溯性来证明其地层等级。我们恢复了 Tozer 和 Thorsteinsson(1964 年)最初的用法,将这些单元归入 Weatherall 地层。梅尔维尔岛西部和中部的德布雷角(Cape de Bray)具有独特的地震特征,因此被认定为正式岩层;而其他地区的德布雷角(Cape de Bray)则因无法持续追踪而被认定为非正式岩层。布拉克基(Blackey)在其被界定的⁓2000 平方公里的露头区域内被视为正式岩层;在地下则不被承认。DCW的形成与腹地罗曼佐夫造山运动造成的挠曲下沉和地壳增厚有初步联系。
The Devonian clastic wedge and underlying strata of SW Canadian Arctic Archipelago: stratigraphic revisions
The Devonian clastic wedge (DCW) and underlying carbonate platforms and basinal mudrocks of the study area are re-examined using legacy seismic data and XRF surveys of borehole chip samples. The Ordovician-Devonian basinal succession of Melville Island is consolidated under the name Ibbett Bay Group within the Northwest Territories, whereas equivalent strata in Nunavut are grouped into the Cape Phillips Formation. The Kitson Formation black shale is correlative with the upper Ibbett Bay Group. Six horizons with high TOC and high gamma response are traced in the Ordovician-Devonian, with the fourth (4a) approximating the Silurian/Devonian boundary; the upper two (4b, 5) are Emsian and Eifelian. In the direction of progradation, the base of Kitson Formation rises stratigraphically from gamma horizon 4a to 5. The upper Kitson represents basinal toes of westward prograding DCW clinoforms. The Blackley and Cape de Bray formations of Embry and Klovan (1976) are not traceable enough to warrant their formation rank. We revert to the original usage of Tozer and Thorsteinsson (1964) where these units are members within the Weatherall Formation. The distinctive seismic character of the Cape de Bray in western and central Melville Island warrants its recognition as a formal member; elsewhere it is informal as it cannot be consistently traced. The Blackey is treated as a formal member in an outcrop area of ⁓2000 km2 where it was defined; it is not recognized in the subsurface. Onset of the DCW is tentatively linked to flexural subsidence and crustal thickening caused by the Romanzof Orogeny in the hinterland.
期刊介绍:
The Canadian Journal of Earth Sciences reports current research in climate and environmental geoscience; geoarchaeology and forensic geoscience; geochronology and geochemistry; geophysics; GIS and geomatics; hydrology; mineralogy and petrology; mining and engineering geology; ore deposits and economic geology; paleontology, petroleum geology and basin analysis; physical geography and Quaternary geoscience; planetary geoscience; sedimentology and stratigraphy; soil sciences; and structural geology and tectonics. It also publishes special issues that focus on information and studies about a particular segment of earth sciences.