投审稿入口
A Differential Study on Structure-Controlled Mineralization between the Zhaoyuan-Laizhou and Penglai-Qixia Metallogenic Districts, Jiaodong Peninsula
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摘要:
胶东半岛的招远-莱州与蓬莱-栖霞成矿区虽同处中生代挤压-伸展转换背景，但其控矿构造特征有比较明显的差异，本研究旨在对比两区断裂构造的控矿规律及构造系统差异，探讨该差异的形成机制。通过对比2个金矿集中区的不同尺度的断裂构造产状、变形特征、以及构造系统，结合焦家、招平、虎路线3条主干断裂的控矿特征与矿体定位规律，分析两区断裂构造控矿规律及断裂构造系统的差异。结果表明：招莱地区的焦家断裂带、招平断裂带以低角度铲式伸展机制为主，表现出中缓产状的多阶段的伸展剪切变形过程，其矿化类型以蚀变岩型为主，矿体以小侧伏角产状产出于主干断裂带中。主干断裂带下盘发育系列陡产状次级控矿构造系统，此类断裂构造产状陡或近直立，矿化以石英脉型和蚀变岩型为主，矿体侧伏角较大，反映了次级构造变形机制以平移走滑为主导；以虎路线断裂为代表的蓬−栖矿区发育高角度脆性断裂。产出在两侧的次级断裂为产状陡倾的系列断层，控制了石英脉的矿化，矿体基本无侧伏现象，表现以走滑作用为主的机制。两区的构造差异体现了胶西北地区构造体制由西向东从伸展向走滑递变的特点，该差异可能受控于中生代胶西北地区挤压−伸展转换过程中区域应力场的改变。
Abstract:ObjectiveAlthough 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 between the two districts and explore the formation mechanisms of these differences.
MethodsBy comparing the 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 orebody localization patterns along the Jiaojia, Zhaoping, and Huxianzhuang major fault zones, the differences in fault-controlled mineralization and structural systems between the two districts were systematically investigated.
ResultsPreliminary analysis indicates that the Jiaojia and Zhaoping fault zones in the Zhaoyuan-Laizhou district are 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 orebodies occurring in the main fault zones at small pitch angles. A series of steeply dipping secondary ore-controlling structures developed in the footwall of the main fault zones, characterized by near-vertical attitudes. These structures host quartz-vein and altered-rock type mineralization, with orebodies displaying larger pitch angles, reflecting a strike-slip-dominated deformation mechanism. In contrast, the Penglai-Qixia district, represented by the Huxianzhuang Fault, is characterized by high-angle brittle faults. The subsidiary faults on both sides are steeply dipping and control quartz-vein type mineralization, with orebodies showing negligible pitch angles, indicating a predominantly strike-slip mechanism.
ConclusionThe 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 variations may be controlled by changes in the regional stress field during the Mesozoic compressional-extensional transition.
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图 2 招—莱成矿区地质简图（a）、焦家金矿田构造蚀变简图（b）、三山岛金矿510 m中段、大尹格庄金矿平面简图（c）和 三山岛金矿30号勘探线剖面图（d）（据文献[19，32]修改）
Figure 2. Geological diagram of Zhao-Lai metallogenic area (a); Schematic diagram of tectonic alteration in Jiaojia gold field (b); Schematic plan of the 510m middle section of Sanshan Island Gold Mine and Dayingezhuang Gold Mine (c); Sanshan Island Gold Mine No. 30 Exploration Line Section (d)
图 3 三山岛主断裂黑色断层泥（西岭ZK96-6孔）（a）、新城金矿黑色断层泥（ZK155-5孔）（b）；招远地区破头青主断裂黄铁绢英岩，含石英碎斑（ZK136-9孔）（c）及招远地区破头青黑色断层角砾，透镜状、圆球状石英角砾（171号脉151-2孔）（d）
Figure 3. Black fault mud on the main fault of Sanshan Island (hole ZK96-6 in Xiling) (a); b-Xincheng Gold Mine Black Fault Mud (Hole ZK155-5) (b); c-Zhaoyuan Baotouqing main fault yellow iron sericite with quartz speckles (hole ZK136-9) (c); Blue-black fault breccia with lenticular and spherical quartz breccia (vein 171, hole 151-2) (d)
图 4 蓬−栖成矿区构造简图（a）、金矿9中段矿化平面示意图（b）和金矿脉与构造裂隙空间关系剖面示意图（c）（据文献[35]修改）
Figure 4. Schematic diagram of the Peng-Qi metallogenic area (a); Schematic diagram of mineralization plane of the middle member of Hougezhuang Gold Mine 9 (b); Schematic cross-sectional diagram of the spatial relationship between gold veins and tectonic fractures (C)
图 5 虎路线地表陡倾断层（a）、虎路线地表断层角砾（b）和侯格庄金矿7中段2-1号脉井下陡倾石英脉（c，d）
Figure 5. Tiger route surface steeply dipping faults (a); Tiger Route Surface Fault Breccia (b); Steeply dipping quartz vein in No. 2-1 vein in the middle section of Hougezhuang gold mine (c, d)
图 7 焦家断裂带构造简图（a），焦家金矿勘探线剖面图（b）和焦家金矿矿体纵投影图（c）（据文献[19]修改）
Figure 7. Schematic diagram of the Jiaojia fault zone (a); Jiaojia Gold Mine Exploration Line Profile (b); Longitudinal projection of the ore body of Jiaojia Gold Mine (C)
图 8 招平断裂带构造简图(a)；大伊格庄金矿勘探线剖面图(b)；招平断裂带各金矿矿体纵投影图(c)（据文献[32]修改）
Figure 8. Schematic diagram of Zhaoping fault zone (a); Exploration line profile of the Greater Igzhuang Gold Mine (b); Longitudinal projection diagram of each gold ore body in Zhaoping fault zone (c)
图 9 虎路线断裂构造简图及各矿床矿体纵投影图
Figure 9. Schematic diagram of the fault structure of the Tiger Route and the longitudinal projection diagram of the ore body of each deposit
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