TTG plutonism in the Archean Abitibi greenstone belt, Superior craton: geodynamic and metallogenic perspectives

IF 2.7 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2026-06-01 Epub Date: 2026-02-21 DOI:10.1016/j.precamres.2026.108039

Silvain Rafini , Morgane Gigoux , Michel Jébrak

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Abstract

This study of the Abitibi greenstone belt (Quebec, Canada) relies on TTG (tonalite, trondhjemite, and granodiorite) composition to investigate the spatiotemporal evolution of the Archean crust and evaluate its metallogenic significance. Trace element signatures (e.g., La/Yb, Sr/Y, Eu/Eu*, Nb, Ta) of 32 dated TTG intrusions is analyzed using the FI-FII-FIII fertility typology developed for felsic volcanic rocks, which links mineral systems to melting depth and crustal architecture. Crystallization depths estimated from normative felsic mineralogy correlated with melting depth and showed a crustal thickness increase during incipient tectonics. The spatiotemporal distribution of TTG types indicates an early partitioning of the Abitibi crust into three distinct domains. The Northeastern Abitibi is characterized by FI types, early crustal thickening, and arc-like settings. These geological characteristics are favorable for porphyry-type deposition within syn-volcanic shallow plutons (e.g., the Chibougamau camp) or Windfall-like intrusion-related gold mineralization within syn-tectonic, LILE-enriched intrusions crystallized at deeper levels, possibly below the brittle crust. The southern volcanic zone is dominated by FIII and FIIb types, consistent with thin-crust, high–heat flux environments linked to the major volcanogenic massive sulfide camps. Finally, the western North Volcanic Zone exhibits an intermediate crustal thickness response and a transition from FII to FI types, associated with syn-tectonic crustal thickening; punctual occurrences of FIII-type intrusions occur, which indicate trenches or thermal corridors prospective for volcanogenic massive sulfides. This research emphasizes the utility of TTG geochemistry as a proxy for crustal processes and mineral potential. It demonstrates that TTG compositional variability offers a robust framework for reconstructing Archean crustal evolution and guiding metallogenic models.

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上克拉通太古代阿比提比绿岩带TTG成矿作用：地球动力学与成矿远景

以加拿大魁北克省阿比提比绿岩带为研究对象，利用TTG（闪长岩、闪长岩和闪长岩）组成研究太古宙地壳的时空演化，并评价其成矿意义。利用长英质火山岩的fi - FI-FII-FIII丰度类型分析了32年TTG侵入岩的微量元素特征（La/Yb、Sr/Y、Eu/Eu*、Nb、Ta），将矿物系统与熔融深度和地壳结构联系起来。根据规范长英质矿物学估算的结晶深度与熔融深度相关，表明在构造初期地壳厚度增加。TTG类型的时空分布表明阿比蒂比地壳早期划分为三个不同的域。阿比提比东北部以FI型、早期地壳增厚、弧形背景为特征。这些地质特征有利于同火山浅埋岩体（如Chibougamau营地）内斑岩型沉积或同构造中与风沙状侵入体相关的金矿化，富集lile的侵入体在更深层次（可能在脆性地壳以下）结晶。南部火山岩带以FIII型和FIIb型为主，与主要火山岩块状硫化物营地相联系的薄壳高热流环境相一致。北火山区西部地壳厚度响应为中间型，由FII型向FI型过渡，与同构造地壳增厚有关；fiii型侵入岩准时出现，预示着火山块状硫化物可能形成的海沟或热走廊。本研究强调TTG地球化学作为地壳过程和矿物潜力代理的效用。结果表明，TTG组成变率为重建太古宙地壳演化和指导成矿模式提供了强有力的框架。

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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.