Ore-controlling Structure and Metallogenic Regularity of the No. Ⅶ Ore Body in Xiadian Gold Deposit

摘要

Located to the eastern side of the famous Yishu Fracture Zone, the Xiadian gold deposit is hosted in the Jiaobei Uplift (the third rank tectonic unit) in the Ludong (eastern Shandong) Rise ( the second rank tectonic unit) tectonically. The metamorphic rocks of the Ar-chean Jiaodong Group are found to the southeastern side of the mine and Quaternary sediments are scarcely distributed. Igneous rock in the mine is mainly the Luojiahe biotite granite and is exposed to the northwestern part of the mine. The ore-controlling structures of the mine are mainly featured by faults, and the Zhaoyuan-Pingdu (Zhaoping) Fault Zone runs across the mine. The middle sector of the Zhaoyuan-Pingdu Fault Zone, called the Zhixia-Jiangjiayao Fault and its secondary and associated faults, make up the ore-controlling structures of the mine. From southwest to northeast, the Xiadian gold deposit comprises four ore bodies; No. Ⅰ, No. Ⅱ, No. Ⅴ and No. Ⅶ. Among them No. Ⅶ ore body is located to the northeastern end of the mine between 523～547 exploration lines and is 480m in total length.