Trace element composition and U-Pb ages of cassiterite from the Bolivian tin belt
نویسندگان
چکیده
The Bolivian tin belt is a metallogenic province in the Eastern Cordillera of Andes known for its Sn, W, Ag, and base metal deposits. Cassiterite, which major constituent many magmatic-hydrothermal ore deposits from belt, can incorporate dozens elements within crystal lattice, making it useful geological tracer mineral also potential host critical elements. New U-Pb dating cassiterite yields Late Triassic (Kellhuani deposit) Oligocene to earliest Miocene (Viloco, Huanuni, Llallagua deposits) ages. These ages confirm that Sn mineralization occurred at least two separate events during magmatic episodes apparently triggered by mantle upwelling, decompression melting, basalt production promoting high heat flow into overlying crust. composition studied hydrothermal some geochemical trends are attributed distance causative intrusion and/or level emplacement. For example, generally enriched Nb Ta higher Ti/Zr Ti/Sc ratios samples xenothermal located adjacent intrusive complexes relative shallow epithermal Therefore, these tracers pointing centers. REE distribution was likely influenced boiling processes, resulted tetrad-type irregularities. Cassiterite unattractive as source (interquartile range [IQR] 4.84–0.037 ppm), (IQR 0.0924–0.0126 Ge 3.92–0.776 ppm). Some deposits, however, contain relatively In 96.9–9.78 ppm, up 1414 ppm) Ga 92.1–3.03, 7437 could constitute an attractive supplementary addition sulfide minerals same
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ژورنال
عنوان ژورنال: Mineralium Deposita
سال: 2021
ISSN: ['1432-1866', '0026-4598']
DOI: https://doi.org/10.1007/s00126-020-01030-3