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Abstract <p>The paper presents the first U–Pb data (LA-ICP-MS method) on zircon from rocks of the intrusive massifs of the Middle and Southern Tien Shan associated with tungsten deposits of various metallogenic types. Age frontiers of the intrusion emplacement in different tectonic segments of the Tien Shan orogenic belt are established. These age frontiers correspond to certain variations of the tectonic settings, which occurred during the Late Carboniferous-Permian post-collisional stage of the development of this orogenic belt. In particular, the emplacement of the high-potassic intrusions associated with tungsten-molybdenum-copper-gold deposits in the Naryn and Terskey segments of the Middle Tien Shan occurred in the post-collisional setting soon after the termination of active subduction, in the intervals of 325–302 Ma to 303–283 Ma, with the notably younger dates in the western direction. The high-potassic intrusions associated with similar tungsten mineralization in the Kurama segment of the Middle Tien Shan were formed in the similar age interval (298–290 Ma) and significantly later than the high-potassic igneous suites accompanied by copper-molybdenum-gold porphyry mineralization. In the southern (Gissar and Zeravshan) segments of the Southern Tien Shan, two age intervals are distinguished for the intrusions associated with tungsten-polymetallic(-gold) deposits: (i) Late Carboniferous-Early Permian (from 307–298 Ma to 292–284 Ma) and (ii) Early Permian (in the order of 293–281 Ma). Tungsten-tin deposits are present in the same mineralized districts, with their intrusions also varying from the Late Carboniferous (305–300 Ma) to mostly Early Permian (296–290 Ma). The latter highlights a different metallogenic specialization of nearly coeval igneous suites at the post-collisional stage, with the participation of magmatic chambers formed in a different protolith in relation to magmatic sources at different crustal and upper mantle levels. The intrusive massifs associated with tungsten-molybdenum deposits in the northern (Nurata) segment of the Southern Tien Shan were formed during the total interval of 282–266 Ma that corresponds to a more mature post-collisional stage.</p>

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Age Frontiers of Tungsten-Bearing Magmatism in Central Asia: Results of Isotopic U–Pb (LA-ICP-MS) Zircon Dating of Rocks from the Intrusive Massifs in the Late Paleozoic Metallogenic Belt of the Tien Shan

  • 期刊论文

  • 发表日期：

    2026年2月28日

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  • S. G. Soloviev,
  • N. S. Bortnikov,
  • S. G. Kryazhev,
  • D. V. Semenova,
  • Yu. A. Kalinin

摘要

Abstract

The paper presents the first U–Pb data (LA-ICP-MS method) on zircon from rocks of the intrusive massifs of the Middle and Southern Tien Shan associated with tungsten deposits of various metallogenic types. Age frontiers of the intrusion emplacement in different tectonic segments of the Tien Shan orogenic belt are established. These age frontiers correspond to certain variations of the tectonic settings, which occurred during the Late Carboniferous-Permian post-collisional stage of the development of this orogenic belt. In particular, the emplacement of the high-potassic intrusions associated with tungsten-molybdenum-copper-gold deposits in the Naryn and Terskey segments of the Middle Tien Shan occurred in the post-collisional setting soon after the termination of active subduction, in the intervals of 325–302 Ma to 303–283 Ma, with the notably younger dates in the western direction. The high-potassic intrusions associated with similar tungsten mineralization in the Kurama segment of the Middle Tien Shan were formed in the similar age interval (298–290 Ma) and significantly later than the high-potassic igneous suites accompanied by copper-molybdenum-gold porphyry mineralization. In the southern (Gissar and Zeravshan) segments of the Southern Tien Shan, two age intervals are distinguished for the intrusions associated with tungsten-polymetallic(-gold) deposits: (i) Late Carboniferous-Early Permian (from 307–298 Ma to 292–284 Ma) and (ii) Early Permian (in the order of 293–281 Ma). Tungsten-tin deposits are present in the same mineralized districts, with their intrusions also varying from the Late Carboniferous (305–300 Ma) to mostly Early Permian (296–290 Ma). The latter highlights a different metallogenic specialization of nearly coeval igneous suites at the post-collisional stage, with the participation of magmatic chambers formed in a different protolith in relation to magmatic sources at different crustal and upper mantle levels. The intrusive massifs associated with tungsten-molybdenum deposits in the northern (Nurata) segment of the Southern Tien Shan were formed during the total interval of 282–266 Ma that corresponds to a more mature post-collisional stage.