Abstract
The Late Paleozoic is considered to be an important stage in the evolution of the Central Asian Orogenic Belt (CAOB). The Bogda Mountains, a northeastern branch of the Tianshan Mountains, record the complete Paleozoic history of the Tianshan orogenic belt. The tectonic and sedimentary evolution of the west Bogda area and the timing of initial uplift of the West Bogda Mountains were investigated based on detailed sedimentological study of outcrops, including lithology, sedimentary structures, rock and isotopic compositions and paleocurrent directions. At the end of the Early Permian, the West Bogda Trough was closed and an island arc was formed. The sedimentary and subsidence center of the Middle Permian inherited that of the Early Permian. The west Bogda area became an inherited catchment area, and developed a widespread shallow, deep and then shallow lacustrine succession during the Mid-Permian. At the end of the Mid-Permian, strong intracontinental collision caused the initial uplift of the West Bogda Mountains. Sedimentological evidence further confirmed that the West Bogda Mountains was a rift basin in the Carboniferous-Early Permian, and subsequently entered the Late Paleozoic large-scale intracontinental orogeny in the region.
Highlights
The Central Asia Orogenic Belt (CAOB) is the largest accretionary orogen on Earth, which was formed by the amalgamation of multiple micro-continents, island arcs and accretionary wedges[1,2,3,4,5]
Of the West Bogda Mountain is a fundamental geological problem involving the tectonic attribute of the Bogda Mountains, structural transformation of the Junggar Basin and the Paleozoic orogenic belt range of the Tianshan Mountains[10,12,13]
The main body of the West Bogda Mountains developed in the Carboniferous-Early Permian with bimodal volcanic-sedimentary rock series (342 Ma-278 Ma)[11,15,32], while the north and south margins of the foothills comprise Upper Paleozoic, Mesozoic, and Cenozoic sedimentary strata (Fig. 1C)
Summary
The Central Asia Orogenic Belt (CAOB) is the largest accretionary orogen on Earth, which was formed by the amalgamation of multiple micro-continents, island arcs and accretionary wedges[1,2,3,4,5]. Based on a detailed sedimentological study of outcrops in the West Bogda Mountains and combined with previous work on the regional tectonic evolution, we attempt to determine the timing of initial uplift of the West Bogda Mountains, which may have important significance in understanding the evolution of the Tianshan orogenic belt. The Bogda Mountains, a northeastern branch of the Tianshan Mountains, are located in the southern part of the Central Asia Orogenic Belt and the southeastern margin of the Junggar Basin (Fig. 1A). The main body of the West Bogda Mountains developed in the Carboniferous-Early Permian with bimodal volcanic-sedimentary rock series (342 Ma-278 Ma)[11,15,32], while the north and south margins of the foothills comprise Upper Paleozoic, Mesozoic, and Cenozoic sedimentary strata (Fig. 1C). The Upper Permian predominantly crops out near Jimsar, while the Lower Permian mainly crops out at the southern margin
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