Isotopic Composition (δ13C, δ18O) and Origin of Manganese Carbonate Ores of the Usa Deposit (Kuznetskii Alatau)     

Kuleshov  V. N.  Bych  A. F. 《Lithology and Mineral Resources》2002,37(4):330-343

Isotopic compositions of carbon and oxygen are studied in different (rhodochrosite, calcareous-rhodochrosite, and chlorite–rhodochrosite) types of manganese carbonate ores from the Usa deposit (Kuznetskii Alatau). The ¹³C value varies from –18.4 to –0.7, while the ¹⁸O value ranges between 18.4 and 23.0. Host rocks are characterized by higher values of ¹³C (–1.9 to 1.0) and ¹⁸O (21.2 to 24.3). The obtained isotope data suggest an active participation of oxidized organic carbon in the formation of manganese carbonates. Manganese carbonate ores of the deposit are probably related to metasomatic processes.  相似文献