The Tectonics and Evolution of the Hudson Bay Region
The Tectonics and Evolution of the Hudson Bay Region
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哈德逊湾地区的构造和演化
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发表时间：
1987
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通讯作者：
M. Roksandic
中科院分区：
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作者：
M. Roksandic
摘要 纳斯塔波卡同斜线以西的贝尔彻褶皱带由一个具有外部区域和内部区域的剑齿质域和一个海洋域组成。外部区域中心部分的平缓褶皱向北、可能向南进入叠瓦结构区域。内部区域的特点是叠瓦结构，影响了地下室。海洋域被细分为几个带。构造搬运总体上是向东的，但局部洋域的某些部分是向西推挤的。位于贝尔彻褶皱带以西的威尼斯克构造低地元古代层序仅轻微褶皱且很少断层。建议哈德逊湾中部和北部属于太古宙哈德逊原大陆。贝尔彻褶皱带的延续和威尼斯克构造低洼的延续在假定的哈德逊原大陆以南被认可。哈德逊湾盆地在其早期开发阶段是一个相对简单的碟形盆地。后来，一个西北走向的中央高压出现了，这可能是一个重要的前寒武纪断裂带重新激活的结果。中央高压最初表现为浅滩，后来表现为岛屿带，将哈德逊湾盆地分为两个子盆地：东部子盆地和西部子盆地。早泥盆世期间，研究区域的普遍抬升和海平面的升降导致了海水退缩和侵蚀。随后的海侵首先发生在西部次盆地，可能是在锡根阶，而东部次盆地很可能在艾弗阶开始之前没有被海洋覆盖。在艾弗勒时期，构造格局发生了变化，导致中央岛屿带沉降和消失，并导致两个次盆地的合并。
Abstract The Belcher Fold Belt west of the Nastapoka homocline comprises an ensialic domain with an external zone and an internal zone, and an oceanic domain. The gentle folds of the central portion of the external zone pass into the zone of imbricate structure northward and, possibly, southward. The internal zone is characterized by an imbricate structure which has affected the basement. The oceanic domain is subdivided into several belts. Tectonic transport was generally eastward, but locally some parts of the oceanic domain were thrust westward. The Proterozoic sequence of the Winisk structural low, situated west of the Belcher Fold Belt, is only gently folded and rarely faulted. It is suggested that the central and northern parts of Hudson Bay belong to the Archean Hudson Protocontinent. The continuation of the Belcher Fold Belt and that of the Winisk structural low are recognized south of the postulated Hudson Protocontinent. The Hudson Bay Basin was a relatively simple, saucer shaped basin in its early stages of development. Later a northwest-trending central high came into being, probably as a result of reactivation of an important Precambrian fault zone. Originally manifested as a shoal and later as an island belt, the central high divided the Hudson Bay Basin into two sub-basins: an eastern sub-basin and a western sub-basin. General uplift of the study area and eustatic fall of sea level during Early Devonian time resulted in regression of the sea, and erosion. The subsequent transgression occurred first in the western sub-basin, probably in the Siegenian, while the eastern sub-basin, in all probability, was not covered by the sea before the beginning of the Eifelian. During Eifelian time a change of tectonic regime occurred, resulting in subsidence and disappearance of the central island belt and in the union of the two sub-basins.