Geochemical anomalies in the mantle of the Pamirs and Tien Shan with applications to the deep-seated sources of ore material |
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| Authors: | V S Lutkov V V Mogarovskii V Ya Lutkova |
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| Institution: | (1) Geological Institute, Tajik Academy of Sciences, ul. Aini 267, Dushanbe, 734063, Tajikistan |
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| Abstract: | The mantle metasomatites (fluidized magmatic rocks) of the Pamir-Tien Shan region show extremely high contents of lithophile and chalcophile trace elements, which often exceeds the regional average abundances of the Earth’s crust. Geochemical relations were established between mantle and crustal rocks, and it was shown that the compositions of magmatic rocks of different age and formation depth and polychronous mineralization are relatively stable. These data and some other facts indicate the possible influence of mantle fluids (melts) on the crustal rocks and processes. An alternative model implies the geochemical influence of crustal rocks on the geochemical characteristics of the regional mantle. The ore material of alkali basic rocks and some hydrothermal and rare metal deposits shows a geochemical affinity to the supposed mantle (mantle-crustal) sources. The ore-bearing fluids (melts) were presumably related to the evolution of ultradeep “hot” material of mantle plumes and “daughter” diapirs carrying alkaline, trace, and ore elements. |
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