Thermo-compositional structure of the north-eastern Canadian Shield from Rayleigh wave dispersion analysis as a record of its tectonic history

Thermo-compositional structure of the north-eastern Canadian Shield from Rayleigh wave dispersion analysis as a record of its tectonic history
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通过瑞利波色散分析加拿大地盾东北部的热成分结构作为其构造历史的记录

DOI:
10.1016/j.epsl.2020.116465
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发表时间:
2020
影响因子:
5.3
通讯作者:
Altoe I
Altoe I
中科院分区:
地球科学1区
文献类型:
--
作者:
Altoe I

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克拉通下方岩石圈龙骨的热和成分结构仍然是一个谜,克拉通是前寒武纪形成的稳定大陆核心。绘制岩石圈温度和成分异质性对于更好地了解控制克拉通形成和演化的地球动力学过程至关重要。在这里,我们调查了北美东北部,其中包括世界上最大的太古代克拉通苏必利尔克拉通及其周围的元古代带。我们根据之前的研究对瑞利波色散曲线进行了建模,该曲线基于聚类分析进行了区域化。接下来,我们对与每个星团的平均色散曲线一致的地壳下热和成分结构进行网格搜索。我们对地壳结构施加约束,并使用热力学方法将热成分结构映射到地震速度。与之前的研究一致,大多数地区需要在一定深度区间内交代矿物的浓度,以适应地震剖面。我们的结果进一步需要成分和热结构的垂直和横向变化,这似乎反映了该区域下方岩石圈形成和改造的不同阶段,在太古代核心、太古代/古元古代碰撞带、中晚元古代碰撞带和受裂谷影响的区域发现了不同的结构。
The thermal and compositional structure of lithospheric keels underlying cratons, which are stable continental cores formed during the Precambrian, is still an enigma. Mapping lithospheric temperatures and compositional heterogeneities is essential to better understand geodynamic processes that control craton formation and evolution. Here we investigate the northeastern part of North America which comprises the Superior Craton, the largest Archean craton in the world, and surrounding Proterozoic belts. We model Rayleigh-wave dispersion curves from a previous study, which were regionalised based on cluster analysis. Next, we perform a grid search for sub-crustal thermal and compositional structures that are consistent with the average dispersion curve for each cluster. We apply constraints on crustal structure and use thermodynamic methods to map thermo-compositional structures into seismic velocity. In agreement with previous studies, most regions require concentrations of metasomatic minerals over certain depth intervals to fit the seismic profiles. Our results further require vertical as well as lateral variations in compositional and thermal structures, which appear to reflect different stages of formation and modification of the lithosphere below the region, with distinct structures found under Archean cores, Archean/Paleoproterozoic collision belts, mid-late Proterozoic collision belts, and zones affected by rifting.
来自岩石圈热模型的复杂克拉通地震结构:深部放射成因加热变化的影响
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