【作者】 冯孝良；

【导师】 孙传敏； 丁俊；

【作者基本信息】 成都理工大学 ， 矿物学、岩石学、矿床学， 2008， 博士

【摘要】 里伍铜锌矿床位于四川省西部,地处康滇地轴西侧,松潘—甘孜造山带东南缘,北东向木里—锦屏弧形推覆构造带北西侧,属九龙—木罩变质—推覆复合构造元古宙铜锌多金属成矿带,为川西典型的中型富铜锌多金属矿床。本文通过对研究区矿床地质特征分析,结合前人研究成果,认为江浪穹隆核部里伍群为里伍铜锌矿床的含矿岩层,含矿岩层为一套海相火山—浊流碎屑岩建造,其下盘紧贴变基性火山岩—次火山岩,显示出成矿作用与侵入岩体空间和成因上的关系。同位素与包裹体分析表明,里伍铜锌矿床成矿物质具多源性,中晚元古代弧后盆地环境下沉积的碎屑岩基础上叠加多次岩浆与构造变质作用,从而形成原始含矿层。成矿物质中的金属组分以深源为主,硫元素则主要来自上地幔,并混合有海水硫,成矿流体以岩浆水、变质水为主,后期混有海水、大气水,里伍铜锌矿床具典型的海相火山碎屑沉积—变质成因的特征。里伍铜锌矿床位于江浪矿田外矿带,矿体呈似层状、透镜状,大体顺层或叠瓦状排列,显示受构造控制明显的特征。受区域构造旋回控制,里伍铜锌矿床成矿作用具多期次特征。结合同位素测年和矿物微相观察,将成矿作用划分为三个期次,其中,奥陶纪(471～473Ma)的构造运动导致区域发生大规模的海侵事件,形成一套陆源火山碎屑岩组成,为区域矿物质的重要沉积时期;印支晚期—燕山早期(184～191Ma)的松藩—甘孜造山运动使江浪变质核杂岩体隆升,为江浪变质核杂岩体的重要构造变形期,核杂岩体受东西向作用发生韧性变形,形成顺层滑脱带和褶皱带,为后期成矿热液体的运移和储存提供了良好的构造空间;133～143Ma为燕山中晚期的构造热液变质作用时期,是区域的重要成矿阶段。构造运动形成大量脆性断裂,岩层伸展变形并使前期的构造复活形成良好的容矿导矿构造,含矿流体在岩浆热驱动下与构造等多因素耦合而形成具有工业意义的硫化物矿床。根据区域地质、物探、化探、遥异常等找矿标志,应用相似类比等原则认为里伍铜锌矿床的深部、外围,以及江浪变质核杂岩外围长枪等核杂岩体具有良好找矿远景。更多还原

【Abstract】 The Liwu Cu-Zn deposit is a typical medium-sized polymetallic deposit in the west of Sichuan province,which located in the west of Kangdian Earth’s axis,the south edge of Songpan-Granze orogen and the northwest of Muli-Jinping arc thrust tectonic zone,and the deposit is the part of paleoproterozoic Cu-Zn polymetallic metallogenic belt of Jiulong-Muli metamorphic-thrust complex zone.Study on the geological characteristics of Liwu deposit and link with the former research fruit in the area,the paper indicated that Liwu group in the central portion of Jianglang dome tectonic is the ore-bearing layers of the deposit,which is a formation of marine volcanic-turbidite clastic rocks.The footwall of metamorphosed basic volcanic rocks-subvolcanic rocks indicates that the mineralization have relation with the space and the genesis of the intrusions.The paper indicates that the Liwu Cu-Zn deposit has polygenetic based on the research of isotope and fluid inclusions,the originality ore-bearing layers formed from Meso-Neoproterozoic clastic rocks which sedimented in the rear-arc basin environment,and have been effected by many Magmatic-tectonic movement later.The most ore matter are characterized with deep focus,the sulfur element derives from upper mantle and mixed with seawater sulfur latterly,the ore-forming fluid is composed mainly with magmatic water and metamorphic water,which mixed with seawater and atmospheric water little,the Liwu Cu-Zn deposit is featured with sea facies volcanic clastic-metamorphic genesis.The Liwu Cu-Zn deposit is in the outside of Jianglang ore filed,the ore body are ranged bedding and imbricate which controlled by tectonic obviously.The mineralization which controlled by the tectonic gyration are featured with polyphase, and the mineralization are divided into three phases based on the isotope dating and the microphase research.The tectonic movement resulted in transgression in ordovician period(471～473Ma),and in this time there had a series volcano-clastic rocks sediment in the area.The late Indosinina-early Yanshan stage(184～191Ma) is the tectonic deformation era of the Jianglang metamorphic core complex,and in which time Jianglang metamorphic core complex uplifted by the Songpan-Granze orogen.Because of the east-west ductile deformation,there formed the surge belt and the drape belt which were the good tectonic space for ore fluid moving and depositing in the metamorphic core complex.The middle-late Yanshan stage(133～143Ma) is the most important phases of mineralization in which there had a lot of tectonic movement in the area.The extentional movement of the terrane relived the former ductile structure,and all the faulting were good for the movement and the deposit of the ore fluid,the ore fluid formed the industrial sulfide deposit when it coupling coexistence with structure and other factors.According to the ore prospecting sign,such as regional geologic,geophysical exploration,chemical exploration,and Remote-sensing anomalies,and apply the comparability-analogy rules,it is thought that the areas,which are the deep and outskirts of Liwu Cu-Zc deposit,and Changqiang metamorphic core complex etc are the perspective area of mineral prospecting.更多还原