【摘要】 "改造成矿作用"是涂光炽院士提出的新理论。这一理论有如下基本论点和鲜明特色:矿质来源的广泛性;成矿流体的特殊性;成矿元素的活泼性;改造作用的内生性;断裂构造的主导性;赋矿岩石的多样性;改造矿床的普遍性;成矿作用的独特性与应有地位——矿床分类的四分法。滇中大姚-牟定式砂岩铜矿是典型的沉积-成岩-后生-改造成因。其主要论据与以下要素有关:裂谷成矿背景;矿源层(K、J)、矿源岩(元谋古陆);矿体受地层层位、岩相、岩性控制,其生成与煤系(提供有机质)、盐层(提供卤素)密切相关;矿体形态产状、矿石结构构造、成矿流体性状与水的来源、有机质类型及其作用在不同成矿期、成矿阶段显著不同。从岩石学的名词概念来解读和划分"改造成矿作用"的上限与下限:上限确定在后生作用之后,下限在变生作用之末。更多还原

【Abstract】 The concept of"Reworked Metallization"is a new theory proposed by Prof.Tu Guangzhi.This theory has its basic arguments and distinctive characteristics as follows:the extensiveness of metallogenic material; the uniqueness of ore-forming fluids;the activity of the metallogenic elements;the endogenic characteristic of the reworked metallization;the leading role played by faulting;the diversity of the host rocks;the wide-spreading of the reworked deposits.Their metallization is unique and has a proper position in-the four-fold division of ore deposits.Dayao-Mouding type of sandstone-hosted copper deposits in Central Yunnan are of typical sedimentary-diagenetic-anadiagenetic-reworked metallogeneses.Their main arguments are as follows:rifting metallogenesis setting;source bed(K,J)and source rock(Yuanmou paleo-continent);the ore bodies are controlled by stratigraphy,lithofacies and lithology.Their characteristics and their occurrence are closely related to coal series which provides organic matter and salt bed that in turn provides halogen for the ore.The shape and occurrence of ore bodies,the texture and structure of ores,the behavior of ore-forming fluids and the source of water and the type of organic matter and its effect are distinct during different metallogenetic stages. To interpret and determine the limits of reworked metallization in terms of the concepts of petrogeny,the upper limit(beginning)is set after-anadiagenesis and the lower limit(ending)is at the end of quasi-metamorphism.更多还原