This paper is the result of geological survey engineering.

Objective The diagenetic age, petrogenetic types, source properties and geodynamic background of the Early Cretaceous granites of Haliheba pluton in the central and southern part of Great Hinggan Range are discussed based on the regional geological survey.

Methods The lithography of granite, U–Pb chronology, geochemistry and Hf isotope composition of zircon are studied by means of microscope, XRF and (LA–) ICP–MS.

Results The Early Cretaceous granites in Haliheiba are composed of fine to medium–grained biotite granite and fine–grained porphyritic biotite granite, and zircon U–Pb ages are (139.1±0.7) Ma and (138.4±1.0) Ma, respectively. The granites are characterized by high SiO₂ (74.09%−77.19%) and alkali enrichment (7.92%−8.46%), and belong to high–K calc–alkaline series. The A/CNK values range from 0.95 to 1.08, indicating that they are metaluminous to weakly peraluminous rocks. The chrondrite–normalized REE patterns are characterized by enrichment of LREEs with (La/Yb)_N values varying from 3.69 to 13.17 and by prominent negative Eu anomalies with δEu values ranging from 0.11 to 0.47. The granites show the enrichment of Rb, U, Th , Nb, Ta, Zr and Hf, and the depletion of Sr, Ba, Ti and P. Zircon Hf isotopic compositions suggest that these granites have high positive ε_Hf(t) values (+5.0 − +11.2) and fairly young two–stage Hf model ages (408−731 Ma).

Conclusions The Haliheiba granites are aluminous A–type granites, which were mainly derived from partial melting of the juvenile crustal materials associated with ancient crustal materials under extensional tectonic setting that was probably controlled by lithospheric delamination and thinning.