Open AccessVosnesensky Cu-porphyry deposit (Southern Urals): formation conditions, trace elements, sulfur isotopes and fluid sources
Author(s) -
S. E. Znamensky,
Natalia N. Ankusheva,
D. A. Artemiev
Publication year - 2020
Publication title -
georesursy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.291
H-Index - 5
eISSN - 1608-5078
pISSN - 1608-5043
DOI - 10.18599/grs.2020.3.48-54
Subject(s) - pyrite , fluid inclusions , geology , δ34s , quartz , calcite , chalcopyrite , geochemistry , mineralogy , dolomite , mineralization (soil science) , sulfur , analytical chemistry (journal) , chemistry , copper , environmental chemistry , paleontology , organic chemistry , soil science , soil water
The paper shows new fluid inclusion and isotopic-geochemical data for minerals from sulphide-carbonate-quartz veins of Vosnesensky Cu-porphyry deposit. Fluid inclusions were analyzed by means Linkam TMS-600 cryostage equipped with Olympus BX 51 optical microscope; trace element amounts were performed used Agilent 7700x and ELAN 9000 mass-spectrometers; sulphur isotopic composition was analyzed on DeltaPLUS Advantagе mass-spectrometer. We determined that fluid inclusions in quartz were homogenized between 215 and 315 ºС, and in latest calcite, they are 230–280 ºС. Fluids are К-Na water chloride with salinity of 3–12 wt % NaCl-eq. Quartz contain high amounts of Al (184–5180 ppm), K (20.1–1040 ppm), Na (30.2–1570 ppm) and Ti (38.4–193 ppm). The REE distribution spectra of pyrite are characterized by light lanthanides accumulation (LaN/YbN = 3.6–6.44), and negative of Ce anomalies (0.7–0.92) and Eu (0.78–0.99). The Y/ Ho ratio in pyrite varies from 27.6 up to 36.8. The δ34S values in pyrite were –1.01…0.8 ‰, in chalcopyrite – 0.9 ‰. The data testify the Cu-porphyry mineralization of Vosnesensky deposit was formed due to magmatic acid high-aluminous К-Na chloride fluid enriched with light REE in mesothermal environment. We identified the geochemical markers of interaction between fluid and host rocks.