Whole rock geochemistry, zircon U-Pb dating and Sr-Nd and Hf isotopic studies of Cretaceous granitoids from Southern Pamir, Tajikistan: insights into Pamir Plateau formation
Moazzen M. Aminov J. Ding L. Mamadjonov Y.
2025Taylor and Francis Ltd.
International Geology Review
2025#67Issue 172058 - 2071 pp.
The Southern Pamir region, a critical part of the Alpine-Himalayan orogenic belt, exhibits a complex tectonomagmatic history that offers insights into the geodynamic evolution of the Pamir Plateau. This study presents comprehensive data on the Cretaceous granitoids from the Kyzylrabat area, including whole-rock geochemistry, zircon U-Pb geochronology and Sr-Nd-Hf isotopic analyses. The analysed granitoids are high-K calc-alkaline to shoshonitic, exhibiting A-type geochemical signatures. Zircon U-Pb ages range from 98.5 to 111.7 Ma, correlating well with contemporaneous volcanic activities. Isotopic data indicate a mixed magmatic origin involving a mantle-derived high-K magma and a crustal-derived felsic component. Petrogenetic analyses reveal co-magmatic trends and magma mixing processes, with geochemical evidence suggesting a mantle source metasomatized by subduction-related fluids. Geodynamic interpretations propose that the granitoids formed in an extensional back-arc setting during the northward subduction of the Shyok branch of the Neotethys Ocean. These findings provide critical constraints on the mid-Cretaceous tectonic and magmatic processes in the Southern Pamir, contributing to a deeper understanding of the orogenic plateau formation and evolution.
A-type granitoid , Cretaceous , Pamir , Shyok Ocean , zircon U-Pb age
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Department of Earth and Environmental Sciences, University of Central Asia, Khorog, Tajikistan
School of Mining and Geosciences, Nazarbayev University, Astana, Kazakhstan
State Key Laboratory of Tibetan Plateau Earth System, Environment and Resources, Chinese Academy of Sciences, Beijing, China
Research Center for Ecology and Environment of Central Asia, Dushanbe, Tajikistan
Department of Earth and Environmental Sciences
School of Mining and Geosciences
State Key Laboratory of Tibetan Plateau Earth System
Research Center for Ecology and Environment of Central Asia
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