Gold potential of the volcanoplutonic zones in the southeastern Siberian Platform and physicochemical conditions of the deposit formation |
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| Authors: | M V Goroshko V A Gur’yanov N V Berdnikov V E Kirillov |
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| Institution: | (1) Faculty of Resource and Environment, Guangxi University, Daxue Road 100, Nanning, 530004 Guangxi, China;(2) Institute of Mineral Resources, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing, 100037, China;(3) Department of Geology and Mineral Resources, Chang’an University, Cuihua Road, Xi’an, 710054 Shaanxi, China;(4) Geological Survey of Western Australia, 100 Plain Street, East Perth, WA 6004, Australia;(5) Yichang Institute of Geology and Mineral Resources, China Geological Survey, Guangyao Road 37, Yichang, 443003 Hubei, China |
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| Abstract: | Numerous gold deposits and occurrences were recognized in the regions of tectonomagmatic activation in the southeastern Siberian
Platform. They are located in four metallogenic zones: the Ket-Kap (skarns, quartz veins, and stockworks; gold-bearing lodes
in silicitolites; and argillisite-sericite metasomatites), Ulkan (clayey-micaceous metasomatites, quartz veins), Preddzhugdzhur
(quartz veins, skarns, and sericite-hydromicaceous metasomatites), and Uda (sericite-hydromicaceous metasomatites). The skarn
mineralization is of Meosozoic age, while the mineralization in the quartz veins, quartz-hydromicaceous metasomatites, and
quartz-sulfide veins may have a Meosozoic, Paleozoic, or Late Paleozoic age.
The highest temperatures were determined for the ore formation in the Preddzhugdzhur skarns (500–715 °C) and the hydrothermal-metasomatic
rocks of the Ket-Kap zone (510–530 °C). The composition of gas-liquid inclusions in the minerals of these rocks is dominated
by aqueous Na, K, and Ca chloride solutions with salinity up to 40 wt % NaCl equiv; fluid contains CO2. Quartz veins and stockworks of the Ket-Kap zone were formed under high (up to 465°C) and moderate temperatures and salinity
up to 32 wt % NaCl equiv. Sometimes, the minerals in these rocks contain inclusions of low-density CO2. The gold-bearing veins of the Preddzhugdzhur zone formed at 225–230°C and salinity of 1–2 wt % NaCl equiv. The ore-bearing
solutions in the gold-bearing veins of the Ulkan zone are characterized by a potassium-sodium-chlorine composition and salinity
of 2–10 wt % NaCl equiv., and the temperature of their formation was 220–280 °C. |
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