naa a22 4500 510736394 CHVBK 20180411083011.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1134/S1075701513040041 doi (NATIONALLICENCE)springer-10.1134/S1075701513040041 Nature of graphitization and noble metal mineralization in metamorphic rocks of the northern Khanka Terrane, Primorye [Elektronische Daten] [A. Khanchuk, L. Plyusnina, A. Ruslan, G. Likhoidov, N. Barinov] Elevated contents of noble metals (NM) have been established in the Riphean-Cambrian graphite-bearing complexes of the northern Khanka Terrane, which metamorphosed under conditions of greenschist to granulite facies. At the previously known graphite deposits of the Turgenevo-Tamga group, NM comprise (ppm): Pt (0.04-62.13), Au (0.021-26), Ag (0.56-4.41), Pd (0.003-5.67), Ru (0.007-0.2), Rh (0.001-0.74), Ir (0.002-0.55), and Os (0.011-0.09). Analyses of graphitized rocks carried out with various methods (IMS, INAA, AAS, AES, fire assay) reveal a wide scatter of the results related to the specifics of sample preparation, in particular, due to a significant loss of NM by thermal oxidation decomposition. Analysis of a low-soluble graphite residue obtained by treatment of graphitized rocks allowed us to establish genetic links between NM mineralization and carbonic alteration of various igneous, granulite- and amphibolitefacies metamorphic rocks, which occur over a vast area. The nonuniform distribution of graphite and NM in rocks, their fine dispersivity, and compositional variability of NM indicate that their origin is related largely to endogenic processes with the participation of deep reduced fluids. In greenschist-facies rocks, fluorine, bromine, and iodine are associated both with ore minerals and graphite, providing evidence for transport of NM by halogene- and carbon-bearing fluids. The inhomogeneous distribution of metals in graphite, microglobular structure, and carbon isotopic composition are the guides for its gas-condensate crystallization. At the same time, thermal analysis and Raman spectroscopy show that graphite formed by metamorphism of carbonaceous matter contained in sedimentary rocks also occurs. It is concluded that the predominant mass of NM is of fluid-magmatic origin with the participation of exogenic and metamorphic sources of metals. Pleiades Publishing, Ltd., 2013 Khanchuk A. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut Plyusnina L. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut Ruslan A. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut Likhoidov G. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut Barinov N. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/4(2013-07-01), 225-244 1075-7015 55:4<225 2013 55 11477 https://doi.org/10.1134/S1075701513040041 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1075701513040041 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Khanchuk A. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut NATIONALLICENCE 700 1- Plyusnina L. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut NATIONALLICENCE 700 1- Ruslan A. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut NATIONALLICENCE 700 1- Likhoidov G. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut NATIONALLICENCE 700 1- Barinov N. Far East Geological Institute, Far East Branch, Russian Academy of Sciences, pr. 100-letiya Vladivostoka 159, 690022, Vladivostok, Russia aut NATIONALLICENCE 773 0- Geology of Ore Deposits Springer US; http://www.springer-ny.com 55/4(2013-07-01), 225-244 1075-7015 55:4<225 2013 55 11477 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer