Structural Setting and Heterogeneous Deformation of the Mesoproterozoic Granite-Gneisses of North Tianshan with the Example of the Karadjilga Massif (Kyrgyzstan)

A. V. Kushnareva; A. K. Khudoley; D. V. AlexeievE. O. Petrov

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Structural Setting and Heterogeneous Deformation of the Mesoproterozoic Granite-Gneisses of North Tianshan with the Example of the Karadjilga Massif (Kyrgyzstan)

机译：Structural Setting and Heterogeneous Deformation of the Mesoproterozoic Granite-Gneisses of North Tianshan with the Example of the Karadjilga Massif (Kyrgyzstan)

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A detailed structural study showed that the Mesoproterozoic Karadjilga granite-gneiss massif of the Kyrgyz North Tianshan represents a sheet intrusion, concordant to the bedding of the host Mesoproterozoic metasedimentary strata. The massif has a complex internal structure with strain gradients from unfoli-ated granite to mylonite. The boundaries of the mylonite, gneiss, and unfoliated granite zones, as well as the foliation in gneisses, are oriented subparallel to the contacts of the massif and are deformed into a single syn-cline together with the host sedimentary strata. The obtained U-Th-Pb (SHRIMP) age of unfoliated granite (1121 ± 13 Ma) is close to the previously obtained age estimates for granite-gneisses (～1090-1130 Ma), and indicates that, regardless of the degree of deformation, all the rocks of the massif belong to an unified igneous complex.

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《Doklady earth sciences》 |2022年第1期|855-861|共7页
作者
A. V. Kushnareva; A. K. Khudoley; D. V. AlexeievE. O. Petrov;
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St. Petersburg State University, St. Petersburg, 199034 Russia,Geological Institute, Russian Academy of Sciences, Moscow, 119017 Russia;

St. Petersburg State University, St. Petersburg, 199034 Russia;

Geological Institute, Russian Academy of Sciences, Moscow, 119017 RussiaAll-Russian Geological Research Institute, St. Petersburg, 199106 Russia;

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Mesoproterozoic; granitoid; heterogeneous deformation; U-Th-Pb age; structural evolution; Tianshan;

Structural Setting and Heterogeneous Deformation of the Mesoproterozoic Granite-Gneisses of North Tianshan with the Example of the Karadjilga Massif (Kyrgyzstan)

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