Abstract
The paper presents the results of comprehensive study of the primary diamond deposit of the Nyurbinskaya pipe in the Yakutian diamondiferous province. It is established, that the pipe is confined to the fault junction of four directions and is composed of the kimberlite of four phases. Analysis of different faults and tectonic fracturing allowed to reconstruct the tectonic stress fields acting at the stage of the kimberlite body formation and to determine their occurrence sequence in time. The data obtained about regularities of the Nyurbinskaya pipe compositional structure and results of geologo-structural studies are combined in a single structural-compositional model of the deposit formation. Peculiarities of the fault network operation during the deposit formation stage are confirmed by experimental results using polarization-optical method. The model allowed to formulate the basic structural characteristics of the prospecting works object within which the formation of kimberlite body type of the Nyurbinskaya pipe is possible and to determine the elements of the fault network which are promising for the kimberlite pipes discovery.
Highlights
Available models of the structure and formation of the primary diamond deposits within the Yakutian province are for the most part based both on the findings of investigation of the kimberlite bodies composition and deep inclusions enclosed in them
The first phase is represented by the micaceous porphyric kimberlites (PK) which characterized by medium- and magnophyric structure, considerably micaceous groundmass and high degree of deuteric alterations as well as by lower content of both crustal and mantle xenoliths
This assumes that the position of kimberlite bodies within sedimentary cover was determined by activation of the fault network of the area exposed to regional tectonic stress field which in turn is derivative of the deep tectono-magmatic processes
Summary
Available models of the structure and formation of the primary diamond deposits within the Yakutian province are for the most part based both on the findings of investigation of the kimberlite bodies composition and deep inclusions enclosed in them. Well studied substance and a distinct lack of structural data are typical of the majority of known deposits as well as of generalized models of diamondiferous kimberlite pipe of the Yakutian province [Kharkiv et al, 1998]. Comprehensive studies of compositional and structural components of the primary diamond deposits structure are requisite. The present work deals with results of the use of such integrated approach to the Nyurbinskaya pipe localization study where the tectonic and compositional structure studies were conducted within the quarry field over 10 years
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