Abstract
We report the first data on the contents of main oxides and REE in rocks and the compositions of pyropes and almandines from the Maiskoe kimberlite body recently discovered in the Nakyn field of the Yakutian kimberlite province. The kimberlites are characterized by low contents of Ti, a slight domination of Mg over Ca, and high contents of K 2O in some samples. The pyropes have high contents of Cr 2O 3 (up to 14.5 wt.%); many of them (∼16%) are poor in Ca. In petrochemical and mineralogical features the kimberlites of the Maiskoe body are complementary to the highly diamondiferous kimberlites of the nearby Botuobinskaya and Nyurbinskaya pipes. At the same time, they are not the final link in the evolution of kimberlite magmatism in the Nakyn field, which makes the latter still more promising for diamonds.
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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