Chemical Composition Features of Dark-Colored Minerals of the Dzheltulinsky Massif as a Reflection of Its Formation Conditions and Deep Structure (Southern Yakutia)

The work contains results of petrologic estimates of crystallization conditions of several generations of py- roxenes and amphiboles from the Mesozoic igneous rocks of poorly studied Dzheltulin alkali massif, being the biggest magmatic structure of the Tyrkandin ore region, located in the eastern part of the Aldan-Stanovoy shield. According to the results of authors’ identification of physical-chemical conditions, existed during py- roxene crystallization, one can judge about their crystallization at different temperatures and at two depth levels. Amphiboles of the earlier intrusions are characterized by relatively high contents of alkalies and alu- minium, later intrusion – by high silicon content. Two levels of crystallization conditions are determined for amphiboles from massif rocks, as well as for pyroxenes. It is found that, petrologic characteristics of dark- colored minerals from the Dzheltulin massif rocks reflect features of deep structure of the Earth’s crust. It is also concluded that, interpreted depth anomalies at attribute seismic section of the main frequency of local wave packets, probably reflect the Mesozoic intermediate magma chamber and channels. Besides, relation of anomalies with the Mesozoic alkali intrusions suggests that mantle channels identified at section of the main frequency of seismic waves, are of the Mesozoic age.

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