Rapid endogenic rock recycling in magmatic arcs

• DOI: 10.1038/s41467-021-23797-3
• Publication Date: 2021-06-10T10:04:33Z
• Authors: Jun-Yong Li; Ming Tang; Cin-Ty A. Lee; Xiao-Lei Wang; Zhi-Dong Gu; Xiao-Ping Xia; Di Wang; De-Hong Du; Lin-Sen Li
• Keywords: Forearc; Migmatite; Protolith

Abstract In subduction zones, materials on Earth’s surface can be transported to the deep crust or mantle, but exact mechanisms and nature of recycled are not fully understood. Here, we report a set migmatites from western Yangtze Block, China. These have similar bulk compositions as forearc sediments. Zircon age distributions Hf–O isotopes indicate that precursors sediments were predominantly derived juvenile arc itself. Using phase equilibria modeling, show experienced high temperature-to-pressure ratio metamorphism most likely by intracrustal thrust faults. By dating magmatic zircon cores overgrowth rims, find entire rock cycle, magmatism, weathering at surface, then burial remelting in crust, took place within ~10 Myr. Our findings highlight faults an efficient recycling channel compressional arcs endogenic important mechanism driving internal redistribution differentiation crust.