对来自多变质格伦维尔前沿构造带的阿尔歇斯山深壳花岗岩进行原位卢-铪石榴石测年

IF 3.5 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Antoine Godet, Marine Jouvent, Christiaan Laureijs, Carl Guilmette, Kyle Larson, Mark Coleman, Jérémie Darveau, Myriam Côté-Roberge
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引用次数: 0

摘要

地质年代学技术的最新进展使我们现在能够有效地解读复杂的高品位多变质造山地层地质过程的时间和持续时间。格勒尼维尔前沿构造带就属于这种情况,它将苏必利尔克拉通向东南方向截断。该构造带揭露了经历了年龄不确定的中高压花岗岩变质作用的准奥陶纪岩石。根据横切关系和传统的地质年代学方法(如 U-Pb 锆石和 40Ar-39Ar 云母测年法),这些变质组合要么被解释为 Archean 时代,与 Superior 克拉顿组装的最后阶段有关,要么被解释为中新生代 Grenvillian 变质作用的结果。在这里,我们通过对偏闪长岩、偏闪长岩正长岩和黑云母花岗岩进行原位石榴石定年,并结合原位痕量元素测绘,重新审视了格勒维里安变质作用在副奥陶系的覆盖范围,并为花岗岩层变质组合提供了新的年龄约束。六个样品的石榴石呈现钟形,偶尔也有尖锐和振荡的镥生长分带,这些样品的石榴石lu-Hf等时线与约2.6 Ga的Archean年代完全相同。在一个样品中,对材料进行的斯帕斯分析趋向于格伦维里安时代(约 1 Ga),该样品中的石榴石显示出与生长后流体辅助扰动一致的镥分带。总之,我们的研究结果表明,格伦维尔前构造带内广泛存在的花岗岩成因变质作用在年龄上主要是新奥陶纪晚期,揭示了东南部苏必利尔克拉通罕见的奥陶纪下地壳露头。我们的研究结果还表明,虽然变质作用的空间范围和精确热条件尚不清楚,但格林维利变质作用的覆盖范围是有限的。本文介绍的结果证明了对多变质地层中石榴石等成岩矿物进行原位同位素地质年代研究的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
In-situ Lu-Hf garnet dating of Archean deep crust granulites from the polymetamorphic Grenville Front Tectonic Zone
Recent advances in geochronological techniques now allow the ability to efficiently decipher the timing and duration of geological processes in complex high-grade polymetamorphosed orogenic terranes. This is the case of the Grenville Front Tectonic Zone, which truncates the Superior Craton to the southeast. The zone exposes parautochtonous Archean rocks that underwent mid- to high-pressure granulite facies metamorphism of uncertain age. The metamorphic assemblages have been either interpreted as Archean and associated with the final stages of the Superior craton assembly, or as the result of Mesoproterozoic Grenvillian metamorphism, based on cross-cutting relationships and traditional geochronology methods such as U-Pb zircon and 40Ar-39Ar mica dating. Herein, we revisit the extent of the Grenvillian metamorphic overprint in the parautochtonous domain and provide new age constraints for granulite-facies metamorphic assemblages through in-situ garnet dating within migmatitic paragneiss, migmatitic orthogneiss, and mafic granulites, combined with in-situ trace element mapping. Six samples, which show bell-shaped and occasionally sharp and oscillatory lutetium growth zoning in garnet, yield garnet Lu-Hf isochrons with identical Archean dates of c. 2.6 Ga. Sparce analyses of material trend toward Grenvillian ages (c. 1 Ga) in one sample from which garnet shows lutetium zoning consistent with post-growth fluid-assisted disturbance. Overall, our results indicate that the widespread granulite-facies metamorphism within the Grenville Front Tectonic Zone is dominantly late Neoarchean in age, unveiling a rare exposure of Archean lower crust in the southeastern Superior Craton. Our results also point towards a limited Grenvillian metamorphic overprint though the spatial extent and precise thermal conditions of this metamorphism are still unknown. The results presented herein demonstrate the potential of in-situ isotopic geochronology on rock-forming minerals like garnet in polymetamorphic terranes.
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来源期刊
Journal of Petrology
Journal of Petrology 地学-地球化学与地球物理
CiteScore
6.90
自引率
12.80%
发文量
117
审稿时长
12 months
期刊介绍: The Journal of Petrology provides an international forum for the publication of high quality research in the broad field of igneous and metamorphic petrology and petrogenesis. Papers published cover a vast range of topics in areas such as major element, trace element and isotope geochemistry and geochronology applied to petrogenesis; experimental petrology; processes of magma generation, differentiation and emplacement; quantitative studies of rock-forming minerals and their paragenesis; regional studies of igneous and meta morphic rocks which contribute to the solution of fundamental petrological problems; theoretical modelling of petrogenetic processes.
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