Petrological and geochemical characteristics of carbonatite in the Maldzhangar massif (Anabar shield)
https://doi.org/10.52349/0869-7892_2022_91_52-67
Abstract
The paper presents results of the petrological and geochemical study of the Maldzhangar carbonatite located in the southeastern part of the Billyakh zone of tectonic melange (southeastern periphery of the Anabar shield). According to results of the U-Pb pyrochlore dating (SHRIMP II), the carbonatite generated about 167 Ma ago. It is established that the carbonatite is represented by three mineral types: calcite, dolomite and calcite-dolomite. The carbonatite composition evolved from early calcitic to calcite-dolomitic and dolomitic. The geochemical similarity of all the varieties of carbonatite indicates that all of them originated from the same melt. The carbonatite is enriched in a wide range of elements: LREE, Nb, Sr, As, MREE, Th, Ba, Ta, Y, Zn, Pb, and Au. Carbonatite geochemical features closely match the mineral composition. LREEs are the major and useful component of commercial interest. Nb, Ta, Y, P, Sr, and Ba may be of commercial interest as minor components. The data obtained suggest that the Maldzhangar carbonatite massif is a source of rare earth and rare metal elements.
About the Authors
V. E. Guzev
A. P. Karpinsky Russian Geological Research Institute (VSEGEI).
Russian Federation
Russian Federation
Guzev Vladislav Evgen’evich – Leading Geologist
74 Sredny Prospect, St. Petersburg, 199106
A. V. Molchanov
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Molchanov Anatoly Vasilyevich – Doctor of Geological and Mineralogical Sciences, head of department
74 Sredny Prospect, St. Petersburg, 199106
E. I. Khorokhorina
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Khorokhorina Elena Ivanovna – Leading Engineer
74 Sredny Prospect, St. Petersburg, 199106
V. V. Semenova
A. P. Karpinsky Russian Geological Research Institute (VSEGEI)
Russian Federation
Russian Federation
Semenova Valentina Vasilievna – Leading Engineer
74 Sredny Prospect, St. Petersburg, 199106
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For citations:
Guzev V.E., Molchanov A.V., Khorokhorina E.I., Semenova V.V. Petrological and geochemical characteristics of carbonatite in the Maldzhangar massif (Anabar shield). Regional Geology and Metallogeny. 2022;(91):52-67. (In Russ.) https://doi.org/10.52349/0869-7892_2022_91_52-67
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