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Abstract <p>For the first time, Sm–Nd isotopic–geochronological studies are conducted for mineralized rocks from PGE–Cu–Ni intrusions of the southern frame of the Monchegorsk pluton, which formed during the activation of a Paleoproterozoic mantle plume about 2.5 Ga. According to our results, the Sm–Nd isotopic age of the Metagabbro 10th Anomaly intrusion, norites of Lake Moroshkovoe, and mineralized melanorites of the lower zone of the Southern Sopcha intrusion is 2482 ± 77, 2479 ± 33, and 2493 ± 41 Ma, respectively. Metagabbro of the upper zone of the Southern Sopcha intrusion are characterized by rejuvenated age of 1920&#xa0;± 52 Ma, which corresponds to Svecofennian metamorphism in the Kola region and is close to the activation of the Monchetundra Fault dividing the Monchepluton and Monchetundra intrusion at the boundary of 2.0–1.9 Ga. Our results supplement the current geochronological model of the region and emphasize polychronous nature of rock formation and metamorphism in the intrusions of the southern frame of the Monchegorsk pluton, as well as their link with regional geodynamic events.</p>

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Formation and Metamorphism Age of PGE–Cu–Ni-Bearing Intrusions of the Southern Frame of the Monchegorsk Pluton (Kola Peninsula): New Sm–Nd Data

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • P. A. Serov,
  • V. V. Chashchin

摘要

Abstract

For the first time, Sm–Nd isotopic–geochronological studies are conducted for mineralized rocks from PGE–Cu–Ni intrusions of the southern frame of the Monchegorsk pluton, which formed during the activation of a Paleoproterozoic mantle plume about 2.5 Ga. According to our results, the Sm–Nd isotopic age of the Metagabbro 10th Anomaly intrusion, norites of Lake Moroshkovoe, and mineralized melanorites of the lower zone of the Southern Sopcha intrusion is 2482 ± 77, 2479 ± 33, and 2493 ± 41 Ma, respectively. Metagabbro of the upper zone of the Southern Sopcha intrusion are characterized by rejuvenated age of 1920 ± 52 Ma, which corresponds to Svecofennian metamorphism in the Kola region and is close to the activation of the Monchetundra Fault dividing the Monchepluton and Monchetundra intrusion at the boundary of 2.0–1.9 Ga. Our results supplement the current geochronological model of the region and emphasize polychronous nature of rock formation and metamorphism in the intrusions of the southern frame of the Monchegorsk pluton, as well as their link with regional geodynamic events.