Sr-Nd and zircon Hf isotopic constraints on petrogenesis of the Early Cretaceous diorite in the Jinjingzui gold deposit, southeast Hubei Province

This paper is the result of geological survey engineering.

Objective The petrogenesis and magmatic origin of the early Cretaceous diorite in Jinjingzui gold deposit are of great significance for the diagenetic and metallogenic relations and perfecting the regional metallogenic regularity.

Methods In this study we report the Sr-Nd and zircon Hf isotopic compositions of diorite in Jinjingzui deposit.

Results The results show that the diorite has relative high initial ⁸⁷Sr/⁸⁶Sr ratio (0.7059-0.7062), negative ε_Nd(t) values (-7.93--7.58) and ε_Hf(t) values (-12.2--6.5), suggesting the magma was derived from partial melting of an enrichment mantle, followed by magma differentiation. There may be continental crust contamination during magmatic evolution.

Conclusions By comparison with reported deposit in cluster, Jinjingzui Au deposit is similar to these Au deposit at Edong cluster in rock- and ore-forming ages, petrogenesis and magma source. However, the gold orebody of Jinjingzui Au deposit mainly lay within the diorite body, which is obviously different from other deposits that lay internal or external contact zone of rocks. The discovery of Jinjingzui deposit is of great significance for perfecting regional metallogenic regularity and gold prospecting and exploration.