Geochronological and geochemical characteristics of intrusive rocks from the Tolgoi gold deposit in the Eastern Shalazhashan of the Alxa block and their tectonic significances

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Key Points

Investigate the geochronological and geochemical characteristics of intrusive rocks related to the Tolgoi gold deposit.
Conduct geochronological studies using LA-ICP-MS zircon U-Pb dating on intrusive rocks.
Analyze geochemical compositions of granite and diorite.
Compare intrusive rocks with other regional magmatic rocks to assess tectonic significance.
Granite and diorite obtained ages of 263.1±1.7 Ma and 251.2±1.9 Ma, suggesting a Late Permian context.
Intrusive rocks exhibit alkaline characteristics with enriched Rb, U, and Th and depletions in Nb and Ti.
Study indicates tectonic transition in the region from subduction to extension during the Late Permian.

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Research uncovers geochronological and geochemical traits in intrusive rocks, indicating potential for hydrothermal deposits in Alxa block.

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ZHANG et al. (2026) studied this question.

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