The significance of Archean sanukitoids in the cratonization process: The example of the Barlow pluton, between the Abitibi and Opatica subprovinces, Superior Craton, Quebec

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-04-11 DOI:10.1016/j.precamres.2025.107789

Esther M.-A. Bou , Dominique Genna , Michel Jébrak , Lucie Mathieu , Jeffrey H. Marsh

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Abstract

Much debate surrounds Archean crustal growth and its evolution, as well as processes leading to the stabilization of the crust (cratonization). The Barlow pluton is a late-tectonic granitoid that intrudes into the boundary between the Abitibi greenstone belt and the Opatica plutonic belt (Québec, Canada), two subprovinces that make up the southeastern part of the Superior Craton. The Barlow pluton and the Maaskitkuu tonalite, one of its host rocks, are useful to improve the understanding of tectonic and magmatic processes along the margins of subprovinces in Archean cratons. Here, whole-rock analyses, dating (U-Pb on zircon) and barometry on amphibole are used to define the petrogenesis of these two plutons. The older Maaskitkuu tonalite (ca. 2705 Ma) belongs to a Tonalite-Trondhjemite-Granodiorite (TTG) intrusive suite and has a high Sr/Y ratio. The Barlow pluton (ca. 2696 Ma) belongs to the sanukitoid group. The Maaskitkuu tonalite emplaced 10 km deeper than the Barlow pluton, pointing to the exhumation of 10 km of rocks in about 11 Ma, corresponding to an exhumation rate of 1.37 mm/yr. When combined with previous structural and seismic studies, the observations support an imbrication of terranes farther to the north and the south to explain the arrangement of both subprovinces, marked by a transcrustal structure. This structure allows melts from the lower crust and the metasomatized mantle to ascend toward the upper crust promoting the cratonization.

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

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.