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Epithermal mineralization in the Kedon Paleozoic volcano-plutonic belt, Northeast Russia: Geochemical studies of Au–Ag mineralization
- Source :
- Journal of Volcanology and Seismology. 11:1-19
- Publication Year :
- 2017
- Publisher :
- Pleiades Publishing Ltd, 2017.
-
Abstract
- This paper is concerned with the geochemical features and conditions of generation for Paleozoic Au–Ag mineralization in the pre-accretionary Kedon (D2-3) volcano-plutonic belt (KVB), which is situated within the Omolon cratonic terrane (Northeast Russia). We present new data on the compositions and concentrations of trace elements and rare-earth elements (REEs) in the host rocks and volcanogenic ores of epithermal Au–Ag fields. The ores are found to be enriched in a wide range of trace elements. The general features of the ores under study include a low level of REE concentrations, an obvious enrichment in light REEs, and considerable variations in europium anomalies, ranging from low negative to low- and strongly positive. Fluid inclusions were studied to show that the ore-forming solutions were hydrocarbonate potassium in composition. The mineral content of the fluid increases toward later, low-temperature phases of the mineralization. We found a tendency of potassium increasing from the earlier oreless quartz to productive quartz going to great depth, as well as a slow decrease in the concentrations of Na+, Ca++, and Cl–. The productive quartz shows direct correlation in Ag–K and a reverse correlation in Ag–Na. The results indicate andesite magmas and meteoric water as the most likely sources of the fluids that have formed epithermal Au–Ag ores in the KVB deposits.
- Subjects :
- geography
Mineralization (geology)
geography.geographical_feature_category
Paleozoic
Andesite
Metals and Alloys
Geochemistry
02 engineering and technology
010502 geochemistry & geophysics
Geotechnical Engineering and Engineering Geology
01 natural sciences
020303 mechanical engineering & transports
Geophysics
0203 mechanical engineering
Volcano
Meteoric water
Fluid inclusions
Quartz
Geology
0105 earth and related environmental sciences
Terrane
Subjects
Details
- ISSN :
- 18197108 and 07420463
- Volume :
- 11
- Database :
- OpenAIRE
- Journal :
- Journal of Volcanology and Seismology
- Accession number :
- edsair.doi...........10cf4fac8d8a7f8fdcd9d0c220f03fd4