Granitoid-hosted gold mineralization in Ikibzyaksky ore field: a new milestone in Baikal-Patom metallogenic province gold potential study

New data is provided on gold mineralization in the southern Baikal-Patom metallogenic province, Ikibzyakskoye ore field, located in Pravo-Mamakansky deep fault zone separating Patom fold area from Baikal-Vitim volcanic-plutonic belt. For the first time, the metallogenic province was found to comprise granitoid-hosted ore vein-stringer zones with high-grade economic gold sulfide-quartz mineralization. This mineralization is localized within fault shistosity zones manifesting intense beresitization and listvenitization (in metabasite xenoliths).

Conditions of localization and criteria for kimberlites exploration (on the example of Igyatta diamondiferous region, Western Yakutia)

The main source of mined diamonds in Russia is the Yakutia diamond-bearing province (YAP). To date, all open areas within the prospective Vilyuy-Markha deep fault zone (VMZ) of the YAP, which is a mineragenetic and which hosted diamond deposits of Mir, International, Nyurbinskaya, Botuobinskaya, have been studied satisfactorily. It is unlikely to reveal new kimberlite fields within its' opened part. In this case, the presence of direct signs of new objects beneath the Mesozoic-Cenozoic strata indicates that the diamond potential of the territory is not exhausted. This was confirmed by the discovery in 2015 of a kimberlite body in the Suldyukar field, which confirmed the presence of the Igyatta diamondiferous region and allows us to view the overlapped areas of the VMZ as the most promising for discovering of the new deposits. However, the search for buried deposits requires improvement of the criteria.

THE MODERN GEODYNAMICS OF THE MIDDLE AND SOUTHERN PART OF CASPIAN SEA

Статья посвящена изучению геодинамики Азербайджанской части Среднего и Южного Каспия на базе современной изученности о геоструктуре исследуемого региона с обоснованными результатами анализа ее геологического строения, GPS данных, сейсмической активности и механизмов очагов землетрясений. Установлено, что основная масса скопления землетрясений сосредоточена в зоне псевдо-субдукции. Очаги погружаются до глубины 70 км. Большая часть землетрясений располагается ниже границы Мохо, что говорит о глубоких корнях Апшероно-Прибалханской подвижной системы. Результаты определения механизма очагов землетрясений показали, что для территории Центрально-Каспийской впадины для малых значений углов осей растяжения характерны большие углы осей сжатия, что свидетельствует о преобладании там сбросо-сдвиговых подвижек. Таким образом, можно сказать, что сейсмические процессы в зоне Апшероно-Челекенского глубинного разлома вызваны одними и теми же причинами – активными тектоническими движениями на границе двух крупнейших структур земной коры региона – Скифско-Туранской плиты и Копетдагско-Кавказской складчатой подвижной области. The article dedicated to the study of geodynamics of the Azerbaijan part of the Middle and Southern Caspian Sea on the basis of the modern study of the geological structures of the region studied with reasonable results of the analysis of its geological structure, GPS data, seismic activity and earthquake focal mechanisms. It was found that the majority of the cluster of earthquakes concentrated in the pseudo-subduction zone. The foci of earthquakes are immersed to the depth of 70 km. Most of the earthquakes is below the Moho boundary, which indicates the deep roots of Apsheron-Balkhan moving system. The results of the mechanism of the earthquakes have shown that for the territory of Central Caspian depression for small angles of the axes of stretching values are typical large-angle compression axis, indicating that the prevalence there is strike-slip shifts. Thus, we can say that the seismic processes in the Absheron-Cheleken deep fault zone caused by the same reasons – with active tectonic movements on the border of two of the largest structures of the Earth’s crust in the region – Scyphian-Turan plate and Kopetdag-Caucasian folded movable area.