Approach to the Distribution of Hidden Guojialing Grano-Diorite in Zhaoyuan and Its Prospecting Significance

摘要

The large Jiaojia, Xincheng gold mines are all located at Jiaojia major fractured zone. The hanging wall of Jiaojia gold mine is Jiaodong Group, while the foot wall is Linglong granite overlying the hidden Guojialing grano-diorite. On the magnetic field, it shows the local high magnetic anomaly transiting to low saltating magnetic field. The latter is reacted by Jiaodong Group, while the former is induced by the hidden Guojialing grano-diorite underlying Linglong granite. On the apparent resistivity profile, it reflected the high resistivity transited to low resistivity. On the above-mentioned transit zone of magnetic field & electric field, the low negative magnetic field & low resistivity field are occurred, the orthogonal point of low resistivity or the low resistivity anomaly zone have been found on the composite profiling curves. These low magnetic & low resistivity anomaly zone reflected the distribution & trending of Jiaojia fractured zone. To the south of Jiaojia gold mine, local high magnetic anomaly transiting to low saltation magnetic field and high resistivity transiting to low resistivity have been found on Matang & Shizhuang gold mines, and the negative magnetic anomaly & low resistivity anomaly zones have been located on transiting zone as well. As for the Xincheng gold mine, its hanging wall is Linglong granite and footwall is Linglong granite overlying Guojialing grano-diorite. A stable low magnetic field transiting to high magnetic field have been found on the magnetic field. On the transiting zone, the magnetic field is shown as negative field. The orthogonal point of low-resistivity or low resistivity anomaly is shown on the composite profiling curves.