Geological Characteristics and Origin of the Qishan Ilmenite Deposit in Shandong Province

Qishan ilmenite deposit in Juxian County is the first evaluated large-scale ilmenite deposit.It is located tectonically in the Gongdanshan uplift of the middle part of the Yishu fault belt.The primary rock and orebodies are brownish green,fine-grained titanium-bearing magnetite-amphibole pyroxene.Among the five bodies discovered,the No.I,II and III ore bodies were controlled in project.The No.1 orebody is 1600 m long,with an average of 180 m,a controlled depth of 204 m,and the average TiO2 and TFe grades of 8.68% and 18.46%,respectively.The No.II orebody is 880 m long,with an average width of 160 m,a controlled depth of 120 m,the average TiO2 and TFe grades of 8.33% and 17.07%,respectively.The No.III orebody is 1600 m long,with a width of 25 ~ 67 m,a control depth of 170m,the average TiO2 and TFe grades of 8.86% and 20.13%,respectively.The orebody coefficient varying from 7.06% to 42.0% suggests the orebodies with stable grade.This deposit is characterized by large scale,simple form and easy-to-exploitation.Based on study on its geological characteristics,it is proposed that this deposit belongs to magma differentiated ilmenite deposit at early period,which formed in the Paleoproterozoic era.