Research output: Contribution to journal › Article › peer-review
The Itmurundy Accretionary Complex, Northern Balkhash Area : Geological Structure, Stratigraphy and Tectonic Origin. / Safonova, I. Yu; Perfilova, A. A.; Obut, O. T. et al.
In: Russian Journal of Pacific Geology, Vol. 13, No. 3, 01.05.2019, p. 283-296.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - The Itmurundy Accretionary Complex, Northern Balkhash Area
T2 - Geological Structure, Stratigraphy and Tectonic Origin
AU - Safonova, I. Yu
AU - Perfilova, A. A.
AU - Obut, O. T.
AU - Savinsky, I. A.
AU - Chyornyi, R. I.
AU - Petrenko, N. A.
AU - Gurova, A. V.
AU - Kotler, P. D.
AU - Khromykh, S. V.
AU - Krivonogov, S. K.
AU - Maruyama, Sh
PY - 2019/5/1
Y1 - 2019/5/1
N2 - 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.
AB - 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.
KW - accretionary complex
KW - basal
KW - Central Asian Orogenic Belt
KW - duplex
KW - ocean plate stratigraphy
KW - Pacific-type convergent margin
KW - sandstone
KW - siliceous sediments
KW - SIKHOTE-ALIN
KW - ROCKS
KW - ALIN OROGENIC BELT
KW - CRUST
KW - OCEAN PLATE STRATIGRAPHY
UR - http://www.scopus.com/inward/record.url?scp=85067400614&partnerID=8YFLogxK
U2 - 10.1134/S1819714019030072
DO - 10.1134/S1819714019030072
M3 - Article
AN - SCOPUS:85067400614
VL - 13
SP - 283
EP - 296
JO - Russian Journal of Pacific Geology
JF - Russian Journal of Pacific Geology
SN - 1819-7140
IS - 3
ER -
ID: 20634148