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
中科院分区:
文献类型:
--
作者:
Altoe I
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.
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影响因子:
2.8
作者:
C. Hieronymus;S. Goes
通讯作者:
S. Goes
DOI:
--
发表时间:
1991
期刊:
影响因子:
--
作者:
P. Thurston
通讯作者:
P. Thurston
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
Kimberley R Scully;D. Canil;D. Schulze
通讯作者:
D. Schulze
影响因子:
5.2
作者:
M. Miller;D. Eaton
通讯作者:
M. Miller;D. Eaton
影响因子:
5.3
作者:
A. Boyce;I. Bastow;E. Golos;S. Rondenay;S. Burdick;R. D. van der Hilst
通讯作者:
A. Boyce;I. Bastow;E. Golos;S. Rondenay;S. Burdick;R. D. van der Hilst