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The comprehensive mineralogical analysis of the Taman nearshore Ti-Zr placers and their provenances in the adjoining late Pliocene sedimentation basin is presented. Taking into account paleogeographic reconstructions and contemporary mineral potential of sediments in the Sea of Azov, a contribution of specific feeding sources of terrigenous minerals to the formation of the late Pliocene placers have been estimated. These sources are crystalline and sedimentary rocks of the Caucasus, the southern Russian Plate, and the southeastern Ukrainian Shield (listed in the order of their contribution). The Miocene placers of the Stavropol Arch and Adygea Prominence, as well as the Cretaceous and younger placers of the Ukrainian Shield and the Voronezh Anteclise are suggested to be transitional reservoirs. Economic deposits are forecasted in the zone of paleostraits. 相似文献
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Ganzha E. A. Lalomov A. V. Chefranova A. V. Grigor’eva A. V. Magazina L. O. 《Lithology and Mineral Resources》2019,54(6):465-479
Lithology and Mineral Resources - The paper presents the geological setting, structure, lithology, and placer-controlling factors in the Krasnokutsk placer rare metal–titanium deposit located... 相似文献
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The paper reports the results of study of the main placer-forming minerals (ilmenite and zircon) from the Umyt’ya coastal–marine placer in the western part of the Khanty-Mansi Autonomous District, Yugra. Microprobe study of 1450 zircon grains taken from the upper and lower ore bodies of the Umyt’ya placer (29 samples) and their comparison with zircon in magmatic rocks from the adjacent folded framing of the North and Nether-Polar Urals (40 analyses) allowed us to recognize five geochemical types of the mineral: Aurbakh (prevailing in the Umyt’ya placer), Severorudnichnyi, Tagil-Kytlym, Shemur, and unknown source. Crystallomorphological characteristics of the identified geochemical types of zircon are given. According to the microprobe data (300 analyses), ilmenite is subdivided into six groups. Comparison of these groups with the composition of ilmenite from magmatic complexes of the North and Nether-Polar Urals showed that they correspond to the same complexes as zircon. Based on peculiarities of the geological structure of the eastern slope of the North and Nether-Polar Urals, four separate areas were identified, each comprising spatially close magmatic complexes regarded as possible sources for ore minerals of the placers: Shchekur’ya–Khorasyur, Yalpigner–Chistop, Vizhai–Ivdel, and Denezhkin Kamen. Based on additional criteria, the Yalpigner–Chistop area was the main source for the Umyt’ya placer. 相似文献
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R. M. Chefranov A. V. Lalomov A. A. Bochneva A. V. Chefranova D. P. Khrushchev O. P. Fedorov 《Lithology and Mineral Resources》2014,49(6):505-518
The results of study of the Umyt’ya rare metal-titanium placer in the Transural province of West Siberia (Khanty-Mansiisk autonomous district) are presented. Lithological features of the placer-hosting Oligocene sediments were used to identify three horizons with different formation conditions and placer metal potentials. Lithofacies analysis of rocks of the upper horizon was accomplished. Comparison of the obtained results with the geophysical information (gamma and electrical logging) makes it possible to determine geological-geophysical criteria for the prospecting and exploration of rare metal-titanium placer deposits. It has been established that the gamma activity of placer-hosting rocks have a high and stable correlation with their composition (the content of minerals of the Zr-Ti assemblage included) and makes it possible to recognize separate sectors with placer bodies of mainly shallow-marine type. Electrical properties of rocks are less representative for the local prospecting, but they provide insight into the placer metal potential of separate rock horizons. Based on the identified criteria, prognostic assessment is given for the placer metal potential of deep horizons in the productive sequence of the Umyt’ya placer. 相似文献
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Geology of Ore Deposits - A comprehensive study of the indicator properties of zircon from rare-metal–titanium placers of the Stavropol Arch (using the example of the most-explored... 相似文献
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