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最近,在华北克拉通北缘,沿东西走向的西拉沐沦构造带两侧异军突起地出现了一个400多千米长、300千米宽的钼矿带,短短4年时间已经发现了10余个大型-中型钼矿床,显示了巨大的资源前景。钼矿床的空间分布受区域东西向、北东向及北西向断裂联合控制,钼矿床的形成与中生代的中酸性侵入体关系密切,矿床产于花岗岩体中、斑岩体内外接触带或附近,矿床类型以斑岩型、石英脉型、火山热液型及云英岩型为主。空间关系表明钼矿床的形成主要与中生代富硅、富钾酸性侵入岩有关。成矿年代学研究表明,西拉沐沦成矿带钼矿具有三期成矿作用:包括245Ma、150Ma和138Ma。其对应的成矿动力学背景为印支期华北板块与西伯利亚板块碰撞造山后伸展阶段和燕山期中国东部构造大转折期。其中,印支期的成矿作用和相应的岩浆活动在以往的工作中较少论及。
Recently, on the northern margin of North China Craton, a molybdenum belt of more than 400 km and 300 km in width emerged along the west-east-west structural belt of Xilamu, with a total of 10 More than a large - medium-sized molybdenum deposit, showing a huge resource prospects. The spatial distribution of the molybdenum deposit is jointly controlled by east, west, north east and north west faults. The formation of molybdenum deposit is closely related to the Mesozoic intrusive bodies of the Mesozoic. The ore deposit is produced in the granite body. The porphyry in or near the contact zone of the porphyry body, The types of deposits are porphyry type, quartz vein type, volcanic hydrothermal type and dolostone type. The spatial relationship indicates that the formation of molybdenum deposits is mainly related to the Mesozoic silicon-rich and potassium-rich acid intrusive rocks. Metallogenic chronological studies show that the molybdenum deposit in the Xilamu metallogenic belt has three stages of metallogenesis: 245Ma, 150Ma and 138Ma. The corresponding metallogenic kinetic background is the post-orogenic extension of the Indosinian North China plate and the Siberian plate and the tectonic turning over of the Yanshanian period in eastern China. Among them, the Indosinian mineralization and corresponding magmatic activity are less discussed in previous work.