Tectonic conditions of ore formation at Deputatskoye tin deposit
Abstract
Terrigenous sediments of Upper Jurassic age, represented by clay shales and sandstones, are developed within the Deputat ore field (North-East Yakut ASSR). The sedimentary strata forms a synclinal fold of near-latitudinal strike, with the ore bodies of the Deputatskoye ore field proper confined to its northern declivity. Shale-sandstone rocks are intruded by the Deputat intrusion of granitoid composition, one of the outcrops of which is located southwest of the deposit. In the central part of the deposit, the contact of the intrusive massif was penetrated by a borehole at a depth of 377.4 meters. Numerous dikes of diabase and diabase porphyrites, quartz porphyries and lamptrophyres are found in the deposit. Extension of the dikes is northeastern and latitudinal, less often northwestern, and the dip is steep to the north and south. The dikes of basic and acidic composition are pre-mining with respect to tin mineralization, while the position of lamprophyres remains unclear. During the formation of the Deputat intrusive, shales and sandstones underwent contact metamorphism. According to the degree of intensity of metamorphic processes, three zones are distinguished, each of which rings around the previous one: 1) zone of intensive oxidation, tourmalization, sericization, sometimes greisenization; 2) zone of oxidation, chloritization, sericization; 3) zone of weak oxidation and sericization ...
References
- Belousov V. V. Tectonic ruptures, their types and mechanism of formation. Tr. Geophysical Institute of the AS USSR, No. 17 (144), 1952.
- Belousov V. V., Gzovekiy M. V. Experimental Tectonics. Nedra,
- Virovlyansky G. M. Regularities of formation of the structure of ore fields of some types of hydrothermal deposits. Intern. geol. congr., XXII session. Reports of Sov. Geol. Problems of Ore Genesis. Nedra, 1964.
- Wolfson F. I. Structures of endogenous ore deposits. In the collection Basic problems in the doctrine of magmatogenic ore deposits. PH of the AS USSR, 1955.
- Grigoriev D.P. Ontogeny of Minerals. PH Lvov, Uni., 1961.
- Indolev L. N. Dykes of the main rocks of the Deputatsky deposits area and questions of their genesis. In Proceedings of the XVII Scientific Session of the Yakutsk Branch of the SB AS USSR, 1966.
- Lukyanov A. V. Structural manifestations of horizontal movements of the Earth's crust. Proc. Geol. Institute of the AS USSR, Vol. 136, 1965.
- Malinovsky E. P. Structural conditions of formation of vein wolframite deposits. Nauka, 1965.
- Nekrasov I. Ya. Main features of mineralization of Deputatskoye tin deposit. Proc. Institute of Geology, Yakutsk Branch, AS USSR, No. 7, 1960.
- Chernyshev V. F. About regularities in the position of plunging and fracture cracks. Proc. IGS AS USSR, Vol. 162, 1955.
- Shainin V. Е. Bull Geol. Soc. America, v. 61, 1950.