Abstract
The Itmurundy zone of the northern Balkhash area is a Pacific-type orogenic belt. It possesses a complex geological structure and hosts rocks of mantle, accretionary and post-orogenic associations. The volcanic and sedimentary rocks of the accretionary association belong to three suites: Itmurundy (O1-2), Kazyk (O2-3) and Tyuretai (O3-S1). The suites are separated by tectonic unconformities or faults of three orders: 1) large regional faults; 2) medium faults separating mantle and oceanic accreted rocks; 3) small faults separating packages consisting of oceanic sediments. The Itmurundy Fm. (O1-2) is the most lithologically variable consisting of oceanic basalt, pelagic chert, hemipelagic siliceous mudstone and siltstone, and trench greywacke sandstone. The packages, each consisting of chert-siliceous mudstone, are separated from each other by 2nd and 3rd order faults of probably thrust nature, i.e. they are parts of duplex structures. The presence of duplex structures and the high degree of deformation of Itmurundy Fm. rocks are typical of accretionary complexes. The associations of volcanic and sedimentary rocks under study represent a full section of oceanic plate stratigraphy (OPS): basalt (MORB, OIB)—chert (pelagic)—siliceous mudstone, siltstone and shale (hemipelagic)—trench sandstones (greywacke). The structural position and the lithology of Itmurundy rocks accord well with the model of formation of accretionary complexes at Pacific-type convergent margins, in particular, those in the western Pacific.
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ACKNOWLEDGMENTS
The authors would like to express their cordial thanks to A.I. Khanchuk, Academician of RAS, and P.V. Ermolov, Academician of NAN of Kazakhstan, interesting and fruitful discussion of the results of field works in northern Balkhash and while preparing the manuscript. We also also grateful to RAS corr.-member A.N. Didenko for his comments and suggestions which definitely helped us to improve the paper.
Funding
The study was supported by the Ministry of Science and Higher Education of the Russian Federation: the state assignments of IGM SB RAS and NSU (no. ZI-14-17/П220, ZI-13-17/П220, ZI-12-17/П22) and project no. 14.Y26.31.0018 “A multidisciplinary study of Pacific-type orogenic belts and development of a holistic model linking evolution of oceans, their active margins and mantle magmatism”.
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Safonova, I.Y., Perfilova, A.A., Obut, O.T. et al. The Itmurundy Accretionary Complex, Northern Balkhash Area: Geological Structure, Stratigraphy and Tectonic Origin. Russ. J. of Pac. Geol. 13, 283–296 (2019). https://doi.org/10.1134/S1819714019030072
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DOI: https://doi.org/10.1134/S1819714019030072