Mineralogical and geochemical characteristics of scheelite from the Vostok-2 au-bi-cu-w skarn deposit (Primorsky krai)
- Authors: Keshikov A.E.1, Nevolko P.A.1, Bondarchuk D.V.2
- 
							Affiliations: 
							- VS Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
- LLC “Nornickel Technical Services”
 
- Issue: Vol 67, No 1 (2025)
- Pages: 29-49
- Section: Articles
- URL: https://journals.rcsi.science/0016-7770/article/view/285858
- DOI: https://doi.org/10.31857/S0016777025010026
- EDN: https://elibrary.ru/vdfeyb
- ID: 285858
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Abstract
The scheelite (CaWO4) is main ore mineral from the Vostok-2 reduced skarn type deposit, which located in Primorie region (Russia) and connected with the Sikhote-Alin central fault. By mineral composition and geochemical characteristics ore rocks were divided into two most common types: skarns and quartz-veins. This study presented results of complex (mineragraphy, cathodoluminescence (CL), electron-probe microanalysis (EPMA), laser-ablation inductively-connected plasma mass-spectrometry (LA-ICP-MS)) researching of scheelite. These parameters for scheelite like inner structure, illumination character in CL and UV, contents of micro- and macroimpurities, Eu/Eu* value, REE spectral shape are crucial indicators of the conditions of mineralization. These signs allowed to identify different mechanism of REE entering in scheelite from skarns and quartz-veins (3Ca2+ ↔ 2REE3+ + □ and Ca2+ + W6+ ↔ REE3+ + Nb5+ where □ is vacancy in the Ca site). By distribution specific of REE three types of scheelite were identified and their temporal relationships were established. Because scheelite inherits REE characteristics from mineral-forming environment some conclusions were shown: evolution of the ore-forming fluid, pulsation nature of the substance’s intake and its single source, and reductive conditions of mineralization were proved for the deposit as a whole.
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	                        About the authors
A. E. Keshikov
VS Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
							Author for correspondence.
							Email: keshikovae@igm.nsc.ru
				                					                																			                												                	Russian Federation, 							Novosibirsk						
P. A. Nevolko
VS Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences
														Email: keshikovae@igm.nsc.ru
				                					                																			                												                	Russian Federation, 							Novosibirsk						
D. V. Bondarchuk
LLC “Nornickel Technical Services”
														Email: keshikovae@igm.nsc.ru
				                					                																			                												                	Russian Federation, 							Saint Petersburg						
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