| Citation: | LIU Xingguo，ZOU Zongqiang，LI Shuaibing，et al. Differences in structure-controlled mineralization between Zhaoyuan-Laizhou and Penglai-Qixia metallogenic districts, Jiaodong Peninsula[J]. Bulletin of Geological Science and Technology，2026，45（4）：1-11 doi: 10.19509/j.cnki.dzkq.tb20250130
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Although both the Zhaoyuan-Laizhou and Penglai-Qixia metallogenic districts in the Jiaodong Peninsula are located in a Mesozoic compressional-extensional transitional setting, their ore-controlling structural characteristics exhibit significant differences. This study aims to compare the ore-controlling patterns and structural system differences of faults in the two districts and explore the formation mechanisms of these differences.
By comparing the fault attitudes, deformation characteristics, and structural systems of faults at different scales in the two gold-concentrated districts, combined with an analysis of the ore-controlling features and ore body localization patterns along three major faults—Jiaojia, Zhaoping, and Huluxian—the differences in fault-controlled mineralization and structural systems between the two districts were systematically investigated.
The results showed that the Jiaojia and Zhaoping fault zones in the Zhaoyuan-Laizhou district were dominated by low-angle listric extensional mechanisms, exhibiting multi-stage extensional shear deformation with moderate to gentle dips. The mineralization is primarily altered-rock type, with ore bodies occurring within the main fault zones at small pitch angles. A series of steeply dipping secondary ore-controlling structures were developed in the footwall of the main fault zones, characterized by steep or nearly vertical attitudes. These structures had quartz-vein and altered-rock type mineralization, with ore bodies displaying larger pitch angles, indicating that the deformation mechanism of the secondary structures was dominated by strike-slip movement. In the Penglai-Qixia district, represented by the Huluxian fault, high-angle brittle faults were developed. The subsidiary faults on both sides were steeply dipping and controlled quartz-vein type mineralization, with ore bodies showing negligible pitch angles, indicating a predominantly strike-slip mechanism. The structural differences between the two districts reflect a transition in the tectonic regime from extension in the west to strike-slip in the east across the northwestern Jiaodong Peninsula. These differences may be controlled by changes in the regional stress field during the Mesozoic compressional-extensional transition.
The research findings can provide a structural theoretical basis for deep mineral exploration in the Zhaoyuan-Laizhou and Penglai-Qixia metallogenic districts in the Jiaodong Peninsula.
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