Geochemistry and the form of «invisible» gold in pyrite from metasomatites of the Khangalas deposit, North-East of Russia
https://doi.org/10.31242/2618-9712-2020-25-3-1
Аннотация
The Khangalas orogenic gold deposit is located in the central part of the Yana–Kolyma gold belt, Northeastern Russia. Gold occurs in the native form in quartz veins, and in the so-called invisible form in pyrite and arsenopyrite of quartz-carbonate-sericite metasomatites. Pyrite and arsenopyrite are the most common ore minerals of the deposit. For the vein-veinlet and veinlet-disseminated types of mineralization of the Khangalas deposit, four generations of pyrite and two generations of arsenopyrite were identified. Despite the widespread occurrence of disseminated pyrite-arsenopyrite mineralization of metasomatites, its mineralogical-geochemical features, isotope-geochemical characteristics and mechanisms of location remain insufficiently studied, and its origin is debatable. The article presents the first results obtained in the studies of the geochemistry of the most common and industrially significant gold-bearing pyrite (Py3) from metasomatites. The elementary composition and morphology of crystals were studied with a JEOL JSM6480LV electron scanning microscope equipped with an Energy 350 Oxford energy dispersion spectrometer. Trace elements in pyrites were determined using a New Wave Research UP-213 laser ablation system (USA), coupled with an Agilent 7700x quadrupole mass spectrometer (Agilent Technologies, USA). The total amount of impurities in pyrite-3 is 0.48–2.12 %, with an average of 1.11 %. The content of Au in a Py3 gross sample determined by the atomic absorption method is up to 39.2 ppm, silver up to 17.38 ppm. Typomorphic trace elements according to LA-ICP-MS analysis are As (4530–18790 ppm), Ni (8.2–1298 ppm), Co (0.23– 505 ppm), Cu (0.5–19 ppm), Zn (3.5–6.4 ppm), Pb (0.5–860 ppm), Sb (0.3–407 ppm), Ag (0.008–1.01 ppm) and Au (0.1–15.9 ppm). Au is closely correlated with As (r = 0.9). Of ~ 100 grains of pyrite-3 examined, ~ 20 % contain microinclusions of galena and sphalerite in defects and crystal growth zones; tetrahedrite and freibergite are recorded in single samples. A microinclusion of native gold Au0 was found only in one sample; it has a size of about 15 μm, fineness of 827 ‰. On the Au – As (mol %) diagram, the data points for Py3 samples from the Khangalas deposit fall below the solubility limit of Au in a solid. This indicates the form of “invisible” gold found in Py3 mainly as structurally bound Au+. The presence of gold-bearing pyrite in metasomatites is of great practical importance and makes it possible to significantly expand the raw material potential of the Khangalas ore cluster
Ключевые слова
LA-ICP-MS trace element analysis,
auriferous pyrite,
form of «invisible» gold,
Khangalas deposit,
Yana–Kolyma gold belt,
NE Russia
При поддержке: This work was supported by the Diamond and Precious Metals Geology Institute, Siberian Branch of the Russian Academy of Sciences (DPMGI SB RAS), and was partially funded by the Russian Foundation for Basic Research (RFBR) (grant number 18-45-140040 r_a). The authors appreciate the workers of DPMGI SB RAS Zayakina N.V. and Vasileva T.I. for their interest and advice that helped improve the article.
Об авторах
M. V. Kudrin
Diamond and Precious Metal Geology Institute SB RAS
Россия
Россия
KUDRIN Maxim Vasilievich, researcher
39 Lenin pr., Yakutsk 677000
L. I. Polufuntikova
Diamond and Precious Metal Geology Institute SB RAS;
M.K. Ammosov North-Eastern Federal University
Россия
Россия
POLUFUNTIKOVA Lena Idenenovna, Candidate of geological and mineralogical sciences, senior researcher, 46 Kulakovsky str., 677000 Yakutsk;
39 Lenina pr., Yakutsk 677000
V. Yu. Fridovsky
Diamond and Precious Metal Geology Institute SB RAS
Россия
Россия
FRIDOVSKY Valery Yuryevich, Doctor of geological and mineralogical sciences, director
39 Lenin pr., Yakutsk 677000
V. V. Aristov
Diamond and Precious Metal Geology Institute SB RAS;
Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS
Россия
Россия
ARISTOV Vasily Vasilievich, Candidate of geological and mineralogical sciences, leading researcher
35 Staromonetny Lane, Moscow 119017
Ya. A. Tarasov
Diamond and Precious Metal Geology Institute SB RAS;
Россия
Россия
TARASOV Yaroslav Alekseevich, postgraduate student, leading engineer
39 Lenin pr., Yakutsk 677000
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Рецензия
Для цитирования:
Kudrin M.V., Polufuntikova L.I., Fridovsky V.Yu., Aristov V.V., Tarasov Ya.A. Geochemistry and the form of «invisible» gold in pyrite from metasomatites of the Khangalas deposit, North-East of Russia. Природные ресурсы Арктики и Субарктики. 2020;25(3):7-14. https://doi.org/10.31242/2618-9712-2020-25-3-1
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