Jade Lockie , Alessandro Ielpi , Rebecca Canam , Morgann G. Perrot , Joshua H.F.L. Davies , Luke Ootes
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引用次数: 0
摘要
研究与超大陆合并大致同时期的沉积序列对于理解碰撞构造下的沉积物扩散至关重要。东臂盆地的古元古代大奴超群是位于太古代奴克拉通边缘的三个沉积序列之一。本文采用化学磨蚀激光烧蚀电感耦合等离子体质谱法研究了松山群(大从超群的基底演替)的U-Pb碎屑锆石年代学、物源和区域相关性。虽然奴拉通的碎屑时代特征在<;1.97-1.95 Ga Hornby Channel组(最下面的Sosan群)——地层的主要组成部分,具有明显的~ 2.0-1.97 Ga碎屑年龄群,表明Sosan群沉积物来源于崩塌的Thelon-Taltson造山带地形。本文提供的数据支持该地区的新相关性,特别是东臂盆地与附近的Kilohigok盆地、Coronation边缘和Hottah地体之间的相关性。通过这些方法,本研究强调了地层完整的地质年代学分析对于提出区域相关性的重要性。
Orogenic unroofing of the Taltson and Thelon orogens depicted through detrital zircon geochronology of the Sosan Group, Great Slave Lake Supergroup (Northwest Territories, Canada)
The investigation of sedimentary successions broadly contemporaneous with supercontinent amalgamation is critical to understand sediment dispersal in response to collisional tectonics. The Paleoproterozoic Great Slave Supergroup of the East Arm basin is one of three sedimentary successions located along the margins of the Archean Slave craton. U-Pb detrital zircon geochronology with chemical-abrasion laser-ablation inductively-coupled plasma mass spectrometry is employed here to investigate the onset of sedimentation, provenance, and regional correlations of the Sosan Group (the Great Slave Supergroup’s basal succession). Although a detrital age signature of the Slave craton is found in the < 1.97–1.95 Ga Hornby Channel Formation (lowermost Sosan Group) – the dominant component through the strata has a distinct ∼ 2.0–1.97 Ga detrital age population, suggesting that the Sosan Group sediments were derived from the collapsing Thelon-Taltson orogenic topography. Data presented herein support novel correlations in the region, specifically between the East Arm basin and the nearby Kilohigok basin, Coronation margin and Hottah terrane. By these means, this study highlights the importance of stratigraphically complete geochronological analyses to propose regional correlations.
期刊介绍:
Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as:
(1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology;
(2) Geochronology and isotope and elemental geochemistry;
(3) Precambrian mineral deposits;
(4) Geophysical aspects of the early Earth and Precambrian terrains;
(5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes.
In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes.
Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.