投审稿入口
Differences in structure-controlled mineralization between Zhaoyuan-Laizhou and Penglai-Qixia metallogenic districts, Jiaodong Peninsula
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摘要:
胶东半岛的招−莱与蓬−栖成矿区虽同处中生代挤压−伸展转换背景，但其控矿构造存在显著分异特征，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个金矿集中区不同尺度断裂构造产状、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，矿体以小侧伏角赋存于主干断裂带内。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。主干断裂两侧发育一系列陡倾次级断裂，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。研究成果可为胶东半岛招−莱与蓬−栖成矿区深部找矿提供构造理论依据。
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 of faults in the two districts and explore the formation mechanisms of these differences.
MethodsBy 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.
ResultsThe 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.
ConclusionThe 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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图 3 招−莱成矿区井下钻井岩芯照片
a. 三山岛主断裂黑色断层泥；b. 新城金矿黑色断层泥；c. 招远地区破头青主断裂黄铁绢英岩，含石英碎斑；d. 招远地区破头青黑色断层角砾，透镜状、圆球状石英角砾
Figure 3. Underground drill core photographs from the Zhaoyuan-Laizhou metallogenic district
图 4 蓬−栖成矿区构造地质与矿化特征（据文献[35]修改）
a. 蓬−栖成矿区构造简图；b. 侯格庄金矿9中段矿化平面示意图；c. 金矿脉与构造裂隙空间关系剖面示意图
Figure 4. Structural geology and mineralization characteristics of the Penglai-Qixia metallogenic district
图 5 虎路线断裂带地表及井下照片
a. 虎路线地表陡倾断层；b. 地表断层角砾；c, d. 侯格庄金矿 7 中段 2-1 号脉井下陡倾石英脉
Figure 5. Surface and underground photographs of the Huluxian fault zone
图 7 焦家断裂带构造简图(a)、焦家金矿勘探线剖面图(b)和矿体纵投影图(c)（据文献[19]修改）
Figure 7. Schematic diagram of Jiaojia fault zone (a), exploration line profile (b) and longitudinal projection of ore bodies (c) in Jiaojia gold mine
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)和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 Dayingezhuang gold mine (b), and longitudinal projection of ore bodies of each gold mine in Zhaoping fault zone (c)
图 9 虎路线断裂构造简图(a)及各矿床矿体纵投影图(b～g)
Figure 9. Schematic diagram of Huluxian fault structure (a) and longitudinal projections of ore bodies in each deposit (b-g)
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