摘要
滇西特提斯构造域存在一系列铜钼金铁多金属斑岩型矿床,这类矿床的成矿作用与本区富碱斑岩体(浆)的侵入、演化有关。以往的研究侧重于成矿物质的来源,但对岩浆侵入过程中形成的局部容矿构造的研究相对薄弱,这不利于提高矿床成因研究的整体水平,也阻碍了该区的地质找矿。本文旨在对马厂箐矿区容矿构造体系研究,揭示岩浆侵入接触构造体系对成矿的控制作用。该矿区是一个铜钼金铁多金属成矿集中区,成矿在时间、空间和物质组成上主要与喜马拉雅期的马厂箐富碱斑岩体有密切关系。由于岩浆侵位的方式、强度、规模等方面的原因,在岩体内、岩体与围岩内外接触带、近接触带围岩中的层间滑脱带和远接触带的围岩中的引张裂隙带等多种岩浆侵入接触构造样式,并为与岩浆作用成矿有关的成矿系列提供有利的成矿场所,分别控制着岩体内斑岩型铜钼矿、岩体与围岩接触带附近的接触交代型铜钼金磁铁矿和围岩地层中的石英脉型、破碎蚀变岩型的金、银、铅锌等矿化类型,并表现出从高温到低温的演化序列。岩浆侵入接触构造体系是该区主要的控岩控矿构造。
Several copper-molybdenum-gold polymetallic deposits have been found in the Tethys metallogenic province,western Yunnan and this type of deposit is related to the intrusion and evolution of alkaline porphyry rocks.Previous studies focused on the derivation of mineralizing material and neglected local structures which were formed during the magma intrusion,but the local structures are key to improve the overall study on origin of the deposit and prospecting and exploration in this area.By studying an ore-host structural system of the deposit,it shows that the intrusive contact structures control the ore-forming process.As a copper-molybdenum-iron-gold polymetallic mineralizing concentration area,the Machangqing porphyry-type deposit has a close relationship with Himalayan alkaline porphyry rocks spatially,temporally and originally.Ascribing to the way,intensity and scale of the magmatic intrusion,some structural models,such as tensional fractures within the rock body,the contact between intrusion and wall rocks,interlayer detachment zone near the contact and pull-apart fissures in the wall rocks far from the contact zone,all of which are depositing sites of mineralization related to the magmatism,control the copper-molybdenum ore bodies in the porphyry rock body,contact metasomatism-type copper-molybdenum-gold-magnetite ore near the contact zone between rock body and wall rock and quartz-vein-and fractured-altered-rock-type gold-silver-lead-zinc ore,respectively.These phenomena demonstrate that there is an evolutionary series from high to low temperature in above spatial order.A contact structural system due to magmatic intrusion is the main rock-and ore-control structures.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2010年第1期55-62,共8页
Geotectonica et Metallogenia
基金
"十一五"国家攻关项目(编号:2006BAB01B10)
武警黄金指挥部专项基金(编号:HJ07-02)资助
关键词
多金属矿床
岩浆侵入接触构造体系
控岩控矿作用
马厂箐
云南
contact zone
alkaline porphyry rocks
rock-and ore-control structure
Machangqing polymetallic deposit
Yunnan
