Metallogenic specialization of the precambrian crystalline complexes in the tyrkanda tectonic zone between granulite terranes of the aldan-stanovoy shield (North-Asian craton)
(ИНГГ СО РАН)
(ИНГГ СО РАН)
дата публикации: 2021
The study of the composition of the Precambrian crystalline complexes raised and exposed along the margins of the North Asian craton allows us characterizing the conditions of formation and clarifying metallogenic typification of the geological structures of various stages of evolution of the lithosphere. Based on these data identification of the promising metallogenic zones and local potentially ore-bearing objects can also be achieved. The goal of the research was to characterize the chemical composition features of geological complexes in the Tyrkanda tectonic zone between the granulite terrains of the Aldan-Stanovoy shield in the south of the North Asian craton. The object is interesting due to the presence of a large number of different types of metamorphic and magmatic rocks. Complex geological structures with numerous stages of intensive ductile and brittle deformations of various kinematics are observed. As a part of the research for the rocks of the zone, the petrographic observation was done and chemical composition was studied. Characteristics and typification of rocks were carried out. Reconstruction of the primary (premetamorphic) types of rocks was performed using the methods of Predovsky and Neelov. A cluster analysis of geochemical data was performed. The excess of background concentrations of chemical elements in clusters was calculated. According to the calculation results, metamorphosed ultramafic and mafic rocks of tholeiitic magmatic series form a single cluster. These rocks are richer with indicator elements for diamond and precious metals. A short description of the probable types of mineralization in these rocks was provided. The most promising for precious metals surrounding areas was determined.
первоисточник: IOP Conference Series: Earth and Environmental Science. 6th World Multidisciplinary Earth Sciences Symposium, WMESS (7 - 11 September, 2020)