摘要
通过例证的方式建立并诠释了富F熔体-溶液流体体系成矿效应的工作原理,认为:①F-OH-在不同载体矿物特别是云母类矿物中的置换行为构成了全岩F含量的主要贡献,具有物源意义;②在大多数情况下,F强烈倾向于分配进入晚期硅酸盐熔体相中,并深刻制约着熔体的结构、相平衡、物理化学性质和分异路径,不过在其他一些情况下F亦将大量进入热液或富水贫硅酸盐的"过渡性"流体相中;③富F流体体系另具有强烈萃取诸如W、Sn等高场强亲氟元素的成矿效应,最终可伴生萤石或冰晶石矿床,此时F作为矿化剂亦影响着Eh值、pH值和化学硬度等体系控矿因素。这样的三重作用围绕着F的基本化学性质一脉相承地促成了富F地质体系的成矿效应及其地球化学行为的特殊性。
By means of exemplifications,working principle of F-rich mineral-melt-solution system has been conceived of and explained as follows：1）the exchange of F--OH-among various carrier minerals,mica groups especially,contributes to a major fluorine content in bulk rocks,which has rather important significance in ore-forming material source;2）in most cases,fluorine is strongly incorporated into late-differentiated melts,and plays a key role in the structure of melt,phase equilibrium or phase relationship,physicochemical property,differentiation route and so on;3）while in other cases,however,F would be also incorporated into the magmatic hydrothermal solution or Si-poor but water-rich transitional fluid;4）F-rich melt-solution systems are apparently able to extract fluophile high field-strength element,such as W,Sn,REE,and finally associated with fluorite or cryolite deposits.As a mineralizer here,fluorine has simultaneously affected the values of Eh,pH,chemical hardness and other ore-controlling factors of corresponding systems.Around the fundamental chemical-geochemical of fluorine,such three functions facilitate in succession the metallogenic effect and geochemical particularity of F-rich geological systems.
出处
《地质科技情报》
CAS
CSCD
北大核心
2014年第4期123-134,142,共13页
Geological Science and Technology Information
基金
中国地质调查局项目([2013]01-036-010)
关键词
载体矿物
熔体结构
助熔剂
矿化剂
成矿效应
carrier mineral
melt structure
flux
mineralizer
metallogenic effect
