胶东中生代金成矿系统  

Mesozoic gold metallogenic system of the Jiaodong gold province,eastern China

作　　者：杨立强[1] 邓军[1] 王中亮[1] 张良[1] 郭林楠[1] 宋明春 郑小礼 

机构地区：[1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]山东省地质矿产勘查开发局,济南250013 [3]山东黄金矿业股份有限公司,莱州261400

出　　处：《岩石学报》2014年第9期2447-2467,共21页Acta Petrologica Sinica

基　　金：国家自然科学基金项目(41230311;40872068;40672064);国家科技支撑计划课题(2011BAB04B09);教育部新世纪优秀人才支持计划(NCET-09-0710);地质过程与矿产资源国家重点实验室开放课题(GPMR201307)联合资助

摘　　要：胶东是我国最重要的金矿集区,其内已发现金矿床150余处,探明金资源储量4000余吨。虽然其金矿床数量众多、资源储量巨大、分布地域广泛、产出空间各异、矿化类型多样,但它们的成矿地球动力学背景、赋矿围岩环境与产出条件及其成矿作用特征总体一致：（1）胶东是一个主要由前寒武纪基底岩石和超高压变质岩块组成、中生代构造-岩浆作用发育的内生热液金矿集区,约130~110Ma的金成矿事件比区域变质作用晚约2000Myr;（2）区域金成矿系统形成于早白垩世的陆缘伸展构造背景,大规模金成矿事件发生在区域NW向伸展转换为NE向伸展后的NEE向挤压变形作用过程中,对应于中国东部岩石圈大规模减薄、华北克拉通破坏和大陆裂谷作用的高峰;（3）金矿床群聚于NNE向玲珑、鹊山和昆嵛山变质核杂岩周边,主要沿前寒武纪变质岩与中生代花岗岩体接触带形成的区域NE-NNE向拆离断层带分布;（4）控矿断裂带经历了早期的韧-脆性变形和晚期的脆性变形构造叠加,在三维空间上呈舒缓波状延展,控制了金矿体的侧伏和分段富集;（5）矿化样式以破碎带蚀变（砾）岩型、（硫化物-）石英脉型和复合脉带型为主,矿石普遍发育压碎、晶粒状和填隙结构,浸染状、细脉浸染状、网脉状、脉状、团块状和块状构造,反映其形成于韧-脆性→脆性变形环境;（6）矿石中金属矿物以黄铁矿、黄铜矿、方铅矿和闪锌矿为主,非金属矿物以石英、绢云母、钾长石、斜长石和方解石为主;金矿物以银金矿和自然金为主、含少量金银矿,主要以可见金的形式赋存于黄铁矿和石英裂隙中、含少量晶隙金和包体金;热液蚀变主要为黄铁矿化、硅化、钾长石化、绢云母化和碳酸盐化;成矿元素为Au-Ag（-Cu-Pb-Zn）;呈现出中-低温蚀变矿化组合特征;（7）成矿流体为壳-幔混合来源,以壳源变质流体为主;Jiaodong Peninsula is the most important gold concentration area of China, more than 150 gold deposits within it have been found and the proven gold reserves add up to 4000 tons. The amount of gold deposits and gold resource are huge, gold occurrence and mineralization type vary with the widely distributed gold deposits, however, the metallogenic geodynamics background, ore-host rock environment, gold occurrence conditions and metallogenic characteristics are identical as a whole： （ 1 ） Jiaodong area is an endogenic hydrothermal gold concentration area consisting of Precambrian base rocks and ultra-high pressure （UHP） metamorphic rocks, tectonism and magmatism happened frequently in Mesozoic, 130 ~ 110Ma gold metallogenic events occurred 2000Myr or so later than the regional metamorphism; （2） regional gold metallogenic system formed in the Early Cretaceous continental-margin extension tectonic background, large-scale gold metallogenic events happened in the process of regional NW extension changing to NE extension followed by the NEE compression, which corresponded to the lithosphere reduction in East China, North China craton destruction and the peak of continental rifting; （ 3 ） gold deposits clustered around the NNE Linglong, Queshan and Kunyushan metamorphic core complexes, mainly along the regional NE-NNE detachment faults developing along the contact zone of Precambrian metamorphic rocks and Mesozoic granites; （4） the ore-controlling fault belts went through the early ductile-brittle deformation and late brittle deformation structure superposition, extended in smooth-out waveforms in 3D space and controlled the lateral trending and subsection enrichment of gold orebodies ; （5） the mineralization types mainly include clastic altered （breccia） rock type, （sulfide-） quartz vein type and compound vein-beh type, textures like the crush texture, crystalline-granular texture, interstitial texture and structures like the disseminated structure, vein structure, massive structure, cr

关 键 词：陆缘伸展 断裂构造复活 地壳连续成矿模式 金矿系统 胶东 

分 类 号：P618.51[天文地球—矿床学]