Diamond-bearing lithosphere of the Siberian platform (based on geophysical data). Precambrian heredity, Paleoproterozoic plume magmatism, diamond content of the Anabar tectonic province

Abstract

In the first part of the article [15], we presented the results of the analysis of the structural relationship of prospective areas and tectonic zonation of the Siberian Platform (SP). Here we demonstrate the reflection of the heredity of structural-material complexes (SMC) of the Precambrian basement of the SP to the Paleoproterozoic mantle-plume events in the geophysical fields. The analysis of the attributes of the prospective areas, as images of the SMC of the deep Precambrian, made it possible to determine the area of maximum thermal-mantle impact on the SP Precambrian lithosphere of the Early Proterozoic superplume, as well as its presumed center in the northwestern segment of the SP. The spatial distribution of the attributes, revealing the correlation of the components with the prospecting areas, contributed to the refinement of the position of the system of orthogonal lineaments on the SP, in general, corresponding to the framework reported in Basharin’s work [3]. The published geological and geophysical materials and the results of processing geophysical data showed that the deep structure of the central part of the Anabar tectonic province (AN) has the attributes characteristic of the Archean diamondiferous cratons. This can indicate the presence of a diamondiferous lithospheric root within AN. The southwestern segment of AN corresponds with the position of the Angara-Vilyui ore belt (AVRP) [2], which, along with other data, can allow us to extend the ore belt in the northeast direction, as well as recognize it in the rank of the Siberian diamond province. The prospects for the discovery of new industrial-diamond-bearing kimberlite fields are associated with the territory of the AN, the positions of the diamond-bearing lithospheric root, zones of deep crustal-mantle faults within it and its boundaries.