Early paleozoic mantle reactivation beneath the northern Yangtze margin: evidence from zircon U–Pb ages and Sr–Nd–Hf–Mg isotopic compositions of diabase intrusions in the South Qinling Belt, central China - Hong Cheng; Shuangqing Li; Wei Wang; Jun He; Wolfgang Siebel; Christian A. Bergemann; Fukun Chen (Journal of Asian Earth Sciences, 2026)