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((click on the title of the article to view the annotation)ORGANISATION, CONTROL, ECONOMICS, SUBOIL USE
Federal State Budgetary Institution "Central Research Institute of Geological Prospecting for Base and Precious Metals" (FSBI "TSNIGRI"), Moscow
The current state of the gold mineral resource base of the Russian Federation is considered. The forecast of the mineral resource base development up to 2040 has been performed. Three scenarios is provided for the gold production until 2040. The need is substantiated to intensify early-stage geological exploration in order to reveal new gold ore objects, to prepare the forecasted resources, and to create the “fund of exploration-deserving objects”.
Key words: gold, mineral resource base, mine production, forecast.
SCIENTIFIC, TECHNICAL AND APPLIED SUPPORT OF GEOLOGICAL EXPLORATION
Federal State Budgetary Institution of Science Geological Institute of the Russian Academy of Sciences of the RAS (FSBIS GIN RAS), Group for the History of Geology, Moscow
The article considers the creation prerequisites and results of operation of the Information System “History of Geology and Mining”. The resource contains extensive personal data, information about organizations, scientific publications lists, documents, and photographic materials. The system provides free access to the information collected over decades of work in the field of history of geosciences at the Geological Institute of the Russian Academy of Sciences.
Key words: history of geology and mining, information system, Geological Institute of the Russian Academy of Sciences.
METALLIFEROUS AND NONMETALLIFEROUS MINERAL DEPOSITS
Federal State Budgetary Institution "Central Research Institute of Geological Prospecting for Base and Precious Metals" (FSBI "TSNIGRI"), Moscow
A multifactor forecasting and prospecting model has been compiled for the largest gold deposit in the Central Aldan metallogenic zone. Based on the previous geological exploration results, the magmatic, lithofacial, tectonostructural, morphological, mineralogical, geochemical, and geophysical prospecting criteria and features were determined. The relevance of development of such a model is determined by that the ore region contains graben-shaped depressions similar to the ore-controlling Kuranakh depression in structure and formation conditions, that are promising for discovering of Kuranakh type gold deposits within them.
Key words:Forecasting and prospecting model, Kuranakh type, karst cavities, metasomatites, gold, subalkaline rocks, dikes, faults.
PETROLOGY, MINERALOGY, GEOCHEMISTRY, LITHOLOGY
1Institute of Tectonics and Geophysics, Far Eastern Branch of the Russian Academy of Sciences, Khabarovsk
2AO "Dal’nevostochnoe PGO", Khabarovsk
The proposed review and analytical article provides updated information on the geology, petrography, mineralogy, and chemical composition of rocks of the Precambrian Nyatygran intrusive suite. The article provides a geochemical interpretation of the chemical and trace element compositions and presents the most actual data on the uranium-lead isotopic age of the rocks. The igneous formations of the Nyatygran gabbro-granodiorite-granite complex make up small intrusive massifs of gabbroids and granitoids, located near the ore-bearing Mel’gin trough, in the basins of the Verkhny Mel’gin, Chepkan, and Bureya rivers and their tributaries. In the gabbroids, the main rock-forming minerals are labradorite, andesine, bluish-green hornblende, and biotite. The gneissic granitoids are dominated by cataclastic quartz and feldspars (andesine, oligoclase, microcline) and contain abundant micas (biotite, sericite). The subalkaline leucogranites are dominated by oligoclase, quartz, orthoclase, and microcline; they also contain significant amounts of biotite and aegirine and rare amphibole (hornblende). The gabbro and gabbrodiorites of normal and elevated alkalinity are assigned to the high-aluminous high-magnesian rocks. The gabbroids represent I-type igneous rocks. The gneissic granitoids of normal and elevated alkalinity are predominantly high-aluminous, more ferroan than magnesian rocks, and are represented by S- and I-type granitoids. The determined isotopic ages of the Nyatygran suite formations are confined to the three main ranges: 933 ± 12–916,3 ± 7,2 Ma (1st magmatic phase: gabbro, gabbrodiorites, amphibole-biotite granites), 909,0 ± 6,6–907,3 ± 5,5 Ma (2nd phase: granodiorites and granites), and 806,8 ± 6,6–789 ± 4,0 Ma (3rd phase: biotite granites and granite-porphyry dikes). The Nyatygran suite age is established as Neoproterozoic and corresponds to the early Neoproterozoic, or Tonian (1000–720 Ma), according to the International Chronostratigraphic Scale, 2018. On the 3rd generation 1:1 000 000-scale State geological maps of the Russian Federation, it is presented as Early Proterozoic.
Key words: gabbroids, granitoids, Nyatygran suite, magmatic phases, Bureya massif, rock chemical composition, isotopic age.
West-Yakutian Research Center of the Republic Sakha (Yakutia) Academy of Science, Mirny In addition to previously individually characterized calcite that, along with serpentine, is the main rock-forming mineral of kimberlite rocks of the Siberian platform (SP), such carbonates as dolomite, aragonite, pyroaurite, strontianite, magnesite, hydromagnesite, and huntite are also widely, although variably, distributed in diatremes of this type. Dolomite was diagnosed in substantial amounts in the SP diatremes, where it associated with calcite and serpentine, occasionally even as a rock-forming mineral. The dolomite formation covers a sufficiently wide temporal interval, from the beginning of metasomatism of the upper mantle rocks through the final stage of hydrothermal-metasomatic processes within cavity-fissure features of the cooling kimberlite melt. Aragonite forms veinlets, radial-beam and sheaf-like reniform aggregates, and druses of acicular crystals in the kimberlites. Pyroaurite was distinguished in the kimberlite rocks in form of the veinlets and nests of fibrous and crystalline appearance, associated with calcite, magnetite, and serpophyte. Pyroaurite often composes large greenish-grey geodes together with serpentine. Pyroaurite is a typical mine-ral for the groundmass of kimberlites at deep horizons of some SP diatremes. This mineral sometimes occurs in form of concentrically zoned concretions in association with serpentine and calcite, as well as individual crystals. Other carbonates are represented by variable amounts of huntite, strontianite, magnesite, and hydromagnesite. Based on mineralogical-geochemical and luminescent properties of the carbonates from the hydrothermal-metasomatic cavity-fissure features in the kimberlite rocks, their stable and regular paragenetic associations were distinguished, reflecting the character of physical-chemical processes at the postmagmatic and supergene stages of the kimberlite formation.
Key words:carbonates, kimberlites, hydrothermal-metasomatic and supergene processes.
MEMORABLE DATES
Federal State Budgetary Institution "Central Research Institute of Geological Prospecting for Base and Precious Metals" (FSBI "TSNIGRI"), Moscow
In 2023, FSBI “TsNIGRI” prepared for the publication a book on the life and work of the famous researcher of ore deposits A. I. Krivtsov. He is widely known as a scientist and organizer of science, who made a significant contribution to the development of the national geological exploration industry. This article partially presents materials of a biographical sketch from the book “The Knight of Ore Geology Anatoly Krivtsov.” The authors consider the scientific and applied projects of the most significance for the entire geological industry, conceived by A. I. Krivtsov in the 1980s and successfully implemented by him together with the staff of TsNIGRI in the post-Soviet period.
Key words: forecasting and prospecting complexes, geological prospecting models, mineral resource security of Russia.
Federal State Budgetary Institution of Science Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences (IGEM RAS), Moscow
The article covers the main stages of the work of Nikolai Alekseevich Shilo, the creator of the modern doctrine of placer deposits and a major organizer of Russian science, who made a significant contribution to the development of the mineral resource base of the USSR and Russia, as well as to the formation and further development of the Far Eastern Branch of the Academy of Sciences.
Key words: placers, placer theory, gold, silver, tin, tungsten, gold deposits, Kolyma.