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RAS Earth ScienceГеология рудных месторождений Geology of Ore Deposits

  • ISSN (Print) 0016-7770
  • ISSN (Online) 3034-5073

Mineralogical and geochemical characteristics of scheelite from the Vostok-2 au-bi-cu-w skarn deposit (Primorsky krai)

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PII
S0016777025010026-1
DOI
10.31857/S0016777025010026
Publication type
Article
Status
Published
Authors
A. E. Keshikov
  • Affiliation: LLC “Nornickel Technical Services”
Volume/ Edition
Volume 67 / Issue number 1
Pages
29-49
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.
Keywords
Восток-2 Приморский край скарны шеелит типоморфизм РЗЭ минерал-индикатор геохимия
Date of publication
16.09.2025
Year of publication
2025
Number of purchasers
0
Views
13

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