RATIO OF DEEP-SEATED AND NEAR-SURFACE STRUCTURES IN THE SOUTHERN PART OF THE YAKUTIAN KIMBERLITE PROVINCE ACCORDING TO SEISMIC DATA Available to Purchase

As a result of areal deep seismic studies in the Earth’s crust and upper mantle, some contrasting anomalies were recognized and mapped to form a complex deep-seated structure. In this paper the main attention is paid to the results obtained by studying the mutual relations of relief features: reference seismic boundaries of the Earth’s crust and sedimentary cover. Low-amplitude platform structures of the sedimentary cover are reliably correlated with more contrasting anomalies of the relief of the seismic roof of the lower consolidated crust and Moho discontinuity. By means of paleostructural analysis of the sedimentary cover this relationship permits the time of activizing or origin of deep-seated structures to be estimated at Middle Paleozoic-Mesozoic. A material indicator of this activity is nearly coeval manifestations of kimberlite magmatism. The linear character of deep-seated and corresponding near-surface structures is evidence of the tectonic nature of this activity. It could be caused by compressional stresses, at which the horizontal tectonic flow of the lower crust matter led to considerable variations in the crust’s thickness, expressed to a degree in the near-surface structures. Hence, being nearly coeval with kimberlite magmatism, the structures of the type recognized may govern regularities of its manifestations near the day surface.