Abstract
The South Tianshan is located to the north of the Tarim block and defines the southern margin of the Paleozoic Central Asian Orogenic Belt (CAOB). This study presents new structural data, geochronological and geochemical results for the Wuwamen ophiolite melange in the Chinese segment of the South Tianshan. In the south, the Wuwamen ophiolite melange shows typical block-in-matrix fabrics and occurs in the footwall of a south-dipping thrust fault, hanging wall of which is composed of weakly metamorphosed and deformed Lower Paleozoic marine to deep marine sequences from the South Tianshan. In the north, a southdipping thrust fault juxtaposes the Wuwamen ophiolite melange in its hanging wall against the high-grade and strongly deformed metasedimentary rocks from the Central Tianshan in its footwall.
Highlights
The South Tianshan is located to the north of the Tarim block and defines the southern margin of the Paleozoic Central Asian Orogenic Belt (CAOB)
They are, from older to younger: (1) regional top-to-the-north ductile shearing linked with subduction and accretionary tectonics; (2) widespread refolding of the earlier foliation, which likely resulted from a subsequent collision event; and (3) localized ductile right lateral strikeslip faulting attributed to late-orogenic extrusion tectonics
We propose an updated geodynamic model for the Paleozoic tectonic and paleogeographic evolution of the South Tianshan
Summary
The South Tianshan is located to the north of the Tarim block and defines the southern margin of the Paleozoic Central Asian Orogenic Belt (CAOB). 1 State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, 210093 Nanjing, China Diachronous evolution of back-arc basins in the South Tianshan: insights from structural, geochronological and geochemical studies of the Wuwamen ophiolite mélange.
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