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云南宝兴厂富碱斑岩型铜钼金多金属矿床构造—岩浆—成矿时空结构
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摘要
宝兴厂钼铜金多金属矿床位于扬子地台西南缘的丽江台缘褶皱带南西端的边缘,北西向金沙江-哀牢山深大断裂与北北东向的程海-宾川深大断裂所挟持的三角地带。金沙江-哀牢山造山带是在被动大陆边缘裂谷环境基础上发展起来的一条陆内造山带。始新世早期(E_2~1)-渐新世晚(E_3~2),由于印度大陆-欧亚大陆汇聚碰撞和向北推挤,形成一系列的右行走滑断裂。其后由于印度大陆向北东方向的强烈楔入并与扬子大陆对接碰撞,造成强大的东西向挤压应力分量,以至渐新世晚期,金沙江-哀牢山断裂北段(德钦以北)呈SN向右行走滑,南段(德钦以南)呈左行走滑,构成东侧扬子陆块与西侧羌塘地体的边界断裂带。沿走滑断裂带发育新生代富碱侵入岩和钾质火山岩,宝兴厂矿区的马厂箐岩体位于其带中。
     论文在前人区域研究成果的基础上,以成矿系统理论为指导,运用岩石学、构造地质学、矿床学、放射性同位素测年和示踪,主量、微量、稀土元素,稳定同位素,流体包裹体等多学科的方法进行了研究。
     研究认为宝兴厂矿区马厂箐岩体成岩环境为碰撞后的大陆边缘的大陆弧环境,成岩物质来源于富集地幔与下地壳,是在拉张环境下下地壳岩石圈拆沉作用或地幔岩浆底侵过程中加厚的下地壳发生2~10%的部分熔融,分离结晶度为0.6,混染率为0.2的条件下形成的;岩浆活动时间跨度为23.18~55.49Ma;岩体属于富碱的斑岩,具有埃达克岩的特点;建立了矿区构造-岩浆-矿化的时空结构模型,探讨了钼铜金铅锌的成矿系列;确定了本区的矿床类型,钼铜矿为中高温岩浆热液型矿床,铜金为中温岩浆热液型矿床,金铅锌矿为中低温热液型矿床;根据矿化类型和产出位置划分了3种矿化类型:斑岩型钼-铜矿、接触带钼-铜-金矿、断裂带(破碎蚀变岩)铜-金-铅-锌矿,3种矿化类型属于同一成矿流体和同一成矿作用下不同成矿阶段演化的产物,构成了从高温高压→低温低压演化的系列;运用成岩成矿动力学机制模型进行了成矿预测,确定了6个预测靶区。
Baoxingchang Mo-Cu-Au polymetallic deposit located in the triangle land which surrounded by SW of fold in Lijiang platform edge,NW of deep-big fault of Jinshajiang-Ailaoshan and NNE of deep-big fault.Jinshajiang-Ailaoshan orogenic belt was an intracontinental orogenic belt which grew under marginal rift of passive continent.From early Eocene to later Oligocene epoch,a series of right-lateral strike slip fault formed by convergence and collision of Indian-Eurasian continent,and jostle in North,Thereafter EW strong compressional stress component formed by Indian continent wedging fiercely,and colliding with Yangtze continent in NE,Up to later Oligocene epoch,North part of Jinshajiang-Ailaoshan fault(North of Deqin) was SN left-slip,and formed bounding fault zone of East Yangtze landmass and West Qiangtang massif.Along the slip fault zone grew alkali-rich intrusive rock and kali lava in Cenozoic era,where Machangqing rock body of Baoxingchang deposit located in.
     Based on the former theories;directed by metallogenic system;used lithology,tectonics, study of mineral deposit,trace and time by radioactive isotope,major and micro lanthanon, stable isotope and fluid inclusion as the methods to do the research.
     The paper reveals that diagenetic environment of Machangqing rock body in Boxingchang deposit was continental arc environment of continental margin after collision. Diagenetic mineral rooted in rich mantle and lower crust,2~10%of lower crust that thickened caused by delamination of lithosphere in lower crust or subface erosion of magma in mantle was partial fusion,fractional crystal degree is 0.6,contamination ratio is 0.2,in extension environment;magmatic intrusive age is from 23.18 to 55.49Ma;rock body is alkali-rich porphyry with the character of adakite;it builds the space-time structure model of tectonics-magma-mineralization of the deposit,and discussed the metallogenic series of Mo-Cu-Au-Pb-Zn.Mo-Cu ore was high-medium temperature magmatic hydrothermal deposit;Cu-Au was medium temperature magmatic hydrothermal deposit;Au-Pb-Zn was medium-low temperature hydrothermal deposit,There were 3 types of mineralization: porphyry-type Mo-Cu deposit,contact belt Mo-Cu-Au deposit,fault zone(fracture altered rock) Cu-Au-Pb-Zn-Ag deposit;they all belonged to the same mineralizing fluid and mineralization,but in different mineralizing phases,all of which formed whole evolution series,temperature and pressure from high to low;it also predicted 6 prospecting areas by using model of diagenetic and mineralized dynamic mechanism.
引文
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