The Kyrgyz-Ata Synform in the South Tien Shan: Structural and kinematic aspects of its evolution |
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Authors: | Yu A Morozov V G Talitskii |
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Institution: | (1) Schmidt United Institute of Physics of the Earth, Russian Academy of Sciences, Bol’shaya Gruzinskaya ul. 10, Moscow, 123995, Russia;(2) Faculty of Geology, Moscow State University, Vorob’evy gory, Moscow, 119992, Russia |
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Abstract: | The complexes of metamorphic rocks that take part in the tectonic structure of the South Tien Shan are mostly confined to
the cores of large synforms and occupy high structural position therein. Problems of their age, origin, metamorphic conditions,
and relationships with the adjacent unmetamorphosed Paleozoic sequences have remained debatable throughout the history of
geological investigations. The results of detailed studies of the Kyrgyz-Ata Synform, a typical structure of the Turkestan-Alay
Zone in the South Tien Shan, are reported in this paper. The metamorphic rocks of the Kan Group participate in the structure
of this synform. On the basis of the study of structural assemblages and the kinematic analysis, it is concluded that the
multistage evolution of this tectonic unit proceeded under transpressive conditions of volcanic trough “crushing.” The detailed
study of rock alteration in the contact zone between the Kan Group and the Middle Devonian basic volcanic rocks allowed us
to suggest that the metamorphic Kan Group is not a self-dependent stratigraphic unit but represents an infrastructure (a metamorphosed
analogue of the volcanic sequence and underlying rocks) displaced tectonically over its own suprastructure. |
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