胶东地区北泊金矿构造特征及其控矿作用

Structural Characteristics and Its Ore-controlling Role of the Beibo Gold Deposit in Jiaodong Area

断裂是热液型矿床的主要成矿控矿构造。招远—平度断裂带经历了脆韧性—韧脆性演化过程,是胶东地区主要的成矿控矿构造。胶东矿集区总体表现出区域构造控制成矿区带、矿田构造控制矿床、矿区构造控制矿体以及强烈变形裂隙带控制矿脉的特征。成矿物质来自深源,甚至来自核—幔边界,在温度、压力等物理化学条件的控制下,深源含矿流体通过地幔热柱多级演化逐渐向上迁移,当达到断裂破裂强度时便会导致液压致裂,并快速贯入到有利的构造部位(如韧脆性—脆韧性剪切带、侵入岩体的内外接触带、密集的构造裂隙带以及各种脉岩与围岩接触带)聚集成矿。北泊金矿与莱西金矿的对比研究再次证实了这种认识,对指导深部地质找矿具有较好的借鉴作用。

Fault is the main ore-controlling structure of hydrothermal type deposit.The Zhaoyuan-Pingdu faultzone has experienced tectonic evolution process of brittle-ductile to ductile-brittle,becoming the mainore-controlling structure in Jiaodong area, and showed metallogenic belts controlled by the regional tectonic, orefield tectonics control ore deposit, structure of mining area to control the ore body, intense deformation fracturedzone controlled the veins.The ore-forming materials are mainly derived from the deep source, even from the coremantle boundary.Under the control of temperature ,pressure and other physical and chemical conditions,theore-bearing fluid of deep-seated is gradually moving upward through the multiple evolution of the mantle plume.When reached fracture strength will lead to the hydraulic fracturing, and rapid penetration to favorable structuralsites, such as ductile brittle to brittle ductile shear zone, intrusive mass inside and outside contact zone, densestructure of fracture belt,a variety of vein rock and wall rock contact zone gathering mineralization.Thecomparison study between the Beibo and the Laixi gold mine once again confirms this understanding, which has agood reference for guiding the deep geological prospecting.