Reconstructing Precambrian sedimentary environments over broad cratonic regions often relies on a combination of facies, structural, and provenance analyses. The Mesoproterozoic (ca. 1270–1090 Ma) Fury and Hecla Group, exposed on the Melville Peninsula and northern Baffin Island (Nunavut, Canada), is considered broadly correlative with strata of the Borden, Hunting–Aston, and Thule basins (together referred to as the Bylot basins). We present the results of updated mapping and the first high-resolution sedimentologic and stratigraphic analysis of the lowermost unit in the Fury and Hecla Group, the Nyeboe Formation. The Nyeboe Formation comprises five distinct facies associations: alluvial to fluvial, eolian-backshore, marine-intertidal, marine foreshore to shoreface, and marine-offshore. Thin mafic units are interbedded within the marine shoreface facies and are interpreted to represent volcanic flows. Lateral relationships between facies associations are complex, but generally, facies associations transition from a terrestrial environment at the base to a nearshore marine environment at the top, indicating a transgression. Considering both the along-strike and -dip thickness trends, the presence of mafic volcanic rock units, and possible syndepositional fault orientations crosscutting the deposits, we infer that the Fury and Hecla Group was deposited in a regime of crustal thinning in a half-graben setting. Our results from the Nyeboe Formation suggest a lithostratigraphic correlation to the Nauyat and Adams Sound formations of the Borden Basin. Therefore, this study establishes a geodynamic link between the opening of the Fury and Hecla Basin to the other Bylot basins and contributes to the understanding of a large late Mesoproterozoic intracontinental-basin system.

中文翻译：

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记录在 Nyeboe 组、Fury 和 Hecla 组中的中元古代拜洛特盆地（加拿大北极努纳武特）的形成

在广泛的克拉通地区重建前寒武纪沉积环境通常依赖于相、结构和物源分析的组合。出露在梅尔维尔半岛和巴芬​​岛北部（加拿大努纳武特）的中元古代（约 1270-1090 Ma）Fury 和 Hecla 群被认为与 Borden、Hunting-Aston 和 Thule 盆地（统称为作为 Bylot 盆地）。我们展示了 Fury 和 Hecla 组最下层单元 Nyeboe 组的更新绘图和首次高分辨率沉积学和地层分析的结果。Nyeboe 组包括五个不同的相组合：冲积到河流、风成-后岸、海洋-潮间带、海洋前岸到岸面和海洋-近海。薄基性单元夹在海相岸面相内，被解释为代表火山流。相组合之间的横向关系很复杂，但一般来说，相组合从底部的陆地环境过渡到顶部的近岸海洋环境，表明海侵。考虑到沿走向和倾角的厚度趋势、基性火山岩单元的存在以及横切沉积物的可能同沉积断层取向，我们推断弗瑞和赫克拉群沉积在半地堑中地壳减薄的制度中。环境。我们对 Nyeboe 地层的结果表明，岩石地层学与博登盆地的 Nauyat 和 Adams Sound 地层存在相关性。所以，