摘要
通过对大兴安岭岔路口超大型斑岩型钼多金属矿床的矿床地质特征分析,总结了矿床控矿因素,研究认为多组构造复合部位发育的火山机构及浅成-超浅成潜火山岩,尤其是成矿斑岩上侵过程中伴随的隐爆作用对成矿至关重要,围岩条件、成矿流体演化等对成矿亦具有重要的意义。具体表现:源江—塔源断裂和古鲁耐—伊北工区断裂控制中生代火山—侵入岩带的展布,尤其两组断裂构造交汇部位控制了1029火山机构的发育;1029高地火山机构控制了超浅成相斑岩体的侵入活动,控制了矿床的产出位置;上侏罗统白音高老组火山岩系为成矿提供了良好的封闭、半封闭围岩条件;成矿斑岩的上侵作用及伴随的隐爆作用,形成的节理、裂隙和微裂隙构造为含矿热液循环交代和富集成矿提供了良好空间,控制了矿化范围、矿化强度;热液流体的多期次循环作用、叠加改造、逐步交代作用是形成岔路口超大型钼多金属矿床的前提条件和决定性因素。
Based on the analysis of geological characteristics of Chalukou super-large porphyry-type molybdenum polymetallic deposit in the Greater Khingan Range,the ore-controlling factors of the deposit are summarized.The study shows that the volcanic structures and shallow-ultra-shallow submerged volcanic rocks developed in multiple groups of structural complexes,especially,the cryptoexplosion accompanying the ascending process of ore-forming porphyry is very important for mineralization,and surrounding rock conditions and the evolution of ore-forming fluids are also important for mineralization.Yuanjiang-Tayuan fault and Guruna-Yibeigongqu fault control the distribution of Mesozoic volcano-intrusive rock belts,especially the intersection of the two groups of fault structures controls the development of 1029 volcanic structure.1029 highland volcanic structure controls the intrusive activity of the super-shallow porphyry body and controls the location of the deposit.The volcanic rock system of Upper Jurassic Baiyingaolao Formation provides a good closed and semi-closed surrounding rock condition for mineralization.The upward invasion and accompanying cryptoexplosion of the ore-forming porphyry,the formation of joints,fissures and micro-fracture structures provide the good space for ore-bearing hydrothermal fluid circulation and metasomatism and enrichment of mineralization,and control the scope and intensity of mineralization.The multi-phase circulation,superimposition and gradual metasomatism of hydrothermal fluid are the prerequisite and decisive factors for the formation of Chalukou super-large molybdenum polymetallic deposit.
作者
王曦
王涛
WANG Xi;WANG Tao(The 9th Geological Exploration Institute of Heilongjiang Province,Qiqihaer 161006,Heilongjiang,China)
出处
《矿产与地质》
2021年第4期624-634,共11页
Mineral Resources and Geology
关键词
钼多金属矿床
控矿因素
岔路口地区
大兴安岭
molybdenum polymetallic deposit
ore-controlling factor
Chalukou area
Daxinganling
