Stoilensky iron ore deposit - an iron ore deposit in the Belgorod region , near the cities of Gubkin and Stary Oskol , on the territory of the Staro-Oskol iron ore region of the Kursk magnetic anomaly .
Content
Field Characterization
The territory occupies a part of the Central Russian Upland and, in morphological terms, represents a low plateau cut by ravines and gullies. The largest rivers are the Sejm and Oskol .
The Stoilensky deposit of iron ores and ferruginous quartzites is located in the central part of the northeastern KMA strip. The geological structure of the deposit involves highly dislocated metamorphic rocks of the Precambrian , in which the iron ore suite of the Kursk Proterozoic series is distinguished. They are overlain by sedimentary rocks of the Paleozoic, Mesozoic and Cenozoic ages with a thickness of 50 to 200 m. Sedimentary rocks from top to bottom are represented by loams, sands, sandstones, ore and barren breccias .
The field is confined to the southeastern part of the Tim-Yastrebovsky syncline. The rocks are crumpled into complex, deep and narrow synclinal and anticlinal folds, mainly of northwestern strike with a steep, often overturned fall of the wings. In the northern part of the deposit, intrusions of diorites and gabbro-diorites are developed; in the southeastern part, conglomerate intrusions are developed.
Interplastic and secant dykes are widely developed, as well as veins of ultrabasic rocks - diorite-porphyrites and granites with a thickness of 10 cm to 20 cm. The iron ore suite is composed of ferruginous quartzites and schists . Its thickness varies from 400 m in the northeast to 800 m in the southwest. The intense folding of Precambrian formations led to a steep, often almost vertical bedding of ore beds. The area of ββthe glandular quartzite deposit over the roof is 4.1 kmΒ², detailed exploration has been carried out to a depth of 460 m, with individual wells up to 700 m. The boundary of ore bodies with sedimentary strata is sharp and uneven.
The hydrogeological conditions of the deposit are determined by the geomorphological and structural features of its location on the watershed plate, dissected by a deeply embedded ravine network, and the restriction from the north, south, and east by the valleys of the Oskoltsa , Chufichki , Oskol rivers, as well as the two-tier structure of the massif. The Cenomanian-Albian canyon, the Turonian and ore-crystalline aquifers, is continuous in the deposit.
See also
- Lebedinsky iron ore deposit
- Stoilensky GOK