STUDY OF OPHIOLITIC COMPLEXES DURING GEOLOGICAL MAPPING ON THE EXAMPLE OF THE ALTAI-SAYAN FOLDED REGION. PT 2

V. M. Isakov, K. V. Staroseltsev

Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia

The paper gives recommendations on studying ophiolites, which are based on their specific structure in three regions of the Altai-Sayan folded region. The Alambaysko-Kaimsky ophiolitic complex includes ophiolites of the southwestern Salair and the Kaimsky block of the northern Gorny Altai. In the Western Sayan, there are three ophiolitic complexes: North-Sayan, Borussky, and Kurtushibinsky. The ophiolitic synform of the Emi River at the Sangilensky massif belongs to the reduced part of the large Shishkhidsky ophiolite. The authors have studied the characteristic features of tectonics and models of formation of each complex in detail. The paper contains the description and the genetic forecast of chromite content of all ophiolitic belts in the Altai-Sayan folded region. The reason why ophiolites are so difficult to map is the interaction of their individual components and intensive fragmentation. The authors suggest a multi-stage research into ophiolitic objects, which includes structural and petrochemical correlation with cenotype reference samples after receiving analytical data by using the actualizing approach.

Key words: ophiolites, ultrabasite, cumulative complex, accretionary prism, chromite content.

DOI 10.20403/2078-0575-2017-1-89-97 

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