The Itmurundy Accretionary Complex, Northern Balkhash Area: Geological Structure, Stratigraphy and Tectonic Origin

I. Yu. Safonova; A. A. Perfilova; O. T. Obut; I. A. Savinsky; R. I. Chyornyi; N. A. Petrenko; A. V. Gurova; P. D. Kotler; S. V. Khromykh; S. K. Krivonogov; Sh. Maruyama

doi:10.1134/S1819714019030072

The Itmurundy Accretionary Complex, Northern Balkhash Area: Geological Structure, Stratigraphy and Tectonic Origin

Authors: Safonova I.Y.¹^,2, Perfilova A.A.¹^,2, Obut O.T.¹^,3, Savinsky I.A.¹^,2, Chyornyi R.I.¹^,2, Petrenko N.A.¹^,2, Gurova A.V.¹^,2, Kotler P.D.¹^,2, Khromykh S.V.¹^,2, Krivonogov S.K.¹^,2, Maruyama S.¹^,4
Affiliations:
1. Novosibirsk State University
2. Sobolev Institute of Geology and Mineralogy, SB RAS
3. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS
4. Tokyo Institute of Technology
Issue: Vol 13, No 3 (2019)
Pages: 283-296
Section: Article
URL: https://journals.rcsi.science/1819-7140/article/view/211641
DOI: https://doi.org/10.1134/S1819714019030072
ID: 211641

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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 (O_1-2), Kazyk (O_2-3) 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. (O_1-2) 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 2^nd and 3^rd 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.

Keywords

sandstone, siliceous sediments, basal, duplex, accretionary complex, ocean plate stratigraphy, Pacific-type convergent margin, Central Asian Orogenic Belt

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The Itmurundy Accretionary Complex, Northern Balkhash Area: Geological Structure, Stratigraphy and Tectonic Origin

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