Reworking of Yangtze crust into the mantle lithosphere of the North China Craton along the Dabie–East Qinling Orogen: Evidence from the Early Cretaceous volcanic rocks

Abstract Mineral chemistry, zircon U-Pb geochronology, and elemental Sr-Nd-Pb-Hf-O isotopic data for the Early Cretaceous volcanic rocks from Dabie East Qinling orogens of China constrain reworking history Yangtze crustal materials in North lithosphere. These provide new insights into recycling deepsubducted mantle transformation process continental subduction to collision. Our show that are characterized by shoshonitic high-K calc-alkaline basaltic trachyandesite, trachyte. They synchronously erupted at ca. 135–120 Ma, have situ εHf(t) values ranging −29.0 −17.2, δ18O 4.89‰ 6.84‰. samples share similar “crust-like” geochemical signatures, whole-rock enrichment large-ion lithophile elements, depletion high field strength elements (Nb/La = 0.12–0.38), highly enriched Sr-Nd compositions, as well (206Pb/204Pb)i 15.97–17.59, (207Pb/204Pb)i 15.33–15.54, (208Pb/204Pb)i 36.87–38.59. The εNd(t) range −24.4 −15.6, −21.8 −13.1, −16.8 −10.9 eastern western Huaiyang belts Orogen Orogen, respectively. Such similarities suggest northward deep-subduction been reworked Craton lithospheric mantle. spatial pattern suggests extended beyond southern margin ran its interior. surface deep boundaries decoupled between Block Craton. igneous Dabie–East were induced response post-collisional unrooting Triassic over-thickened lithosphere coupling.