斑岩-矽卡岩型钼矿成矿控制因素

Controlling factors on the formation of porphyry-skarn Mo deposits

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中文摘要：本文从成钼矿岩浆的化学组分和物理化学性质,以及成钼矿流体的出溶和金属堆积过程两个层次,探讨了斑岩-矽卡岩型钼矿的成矿控制因素.研究揭示,不同构造环境中的斑岩-矽卡岩型钼矿的成矿岩浆均不富集钼,氧化性富水岩浆是形成斑岩-矽卡岩型钼矿的基础,成矿流体沿岩浆房顶部衍生的小岩株高度聚集是成钼矿之关键环节.研究还揭示,大型-超大型斑岩-矽卡岩型钼矿均具有多期岩浆-热液活动叠加成矿的特点,成矿岩体与大岩浆房相连,并且成矿岩浆能多期侵位与成矿,是形成大型-超大型钼矿的关键因素.综合来看,斑岩-矽卡岩型钼矿是岩浆体量、岩浆氧逸度和水含量、流体聚集程度以及多期岩浆-热液活动叠加成矿多因素耦合的产物.岩浆体量、岩浆氧逸度和岩浆水含量是基础,流体聚集程度是关键,要形成大型-超大型斑岩-矽卡岩型钼矿,还需要多期岩浆-热液活动的叠加成矿.研究提出,寻找斑岩-矽卡岩型钼矿,在关注岩体地球化学属性的同时,还应关注岩体的空间结构属性以及多期岩浆-热液活动叠加成矿特征的识别.

外文摘要：In this paper,the controlling factors for the formation of porphyry-skarn Mo deposits have been discussed based on investigations of chemical compositions and physicochemical properties of ore-forming magmas and processes of the fluid exsolution and metal precipitation.The results show that Mo was generally depleted in ore-forming magmas of various porphyry-skarn Mo deposits in different tectonic settings.Oxidizing water rich magma is the basis for the formation of porphyry-skarn Mo deposits.The high ore-forming focusing degree along small stocks derived originally from top parts of the deep-sited magma chambers was the critical link for the formation of porphyry-skarn Mo deposits.It is also shown that large to super-large sized porphyry-skarn Mo deposits are commonly characterized with the multi-stage magmatic-hydrothermal superimposed metallogeny and magmas of their ore-forming porphyry stocks were connected with large magma chambers.In addition,their ore-forming magmas resulted in multiple-phases intrusions and metallogenies which are key factors for the formation of large to super-large sized porphyry-skarn Mo deposits.In summary,the porphyry-skarn Mo deposit was the coupling product of various factors including the magmatic volume,magmatic oxygen fugacity,magmatic water content,ore-forming fluid accumulation degree,and the superposition mineralization of multi-stage magmatic-hydrothermal activities.Among them,the magma chamber volume,magmatic oxygen fugacity and magmatic water content are basic factors,the ore-forming fluid focusing degree is a critical factor,and the superposition mineralization of multi-stage magmatic-hydrothermal activities is a key factor mostly required for the formation of large to super-large sized porphyry-skarn Mo deposits.Moreover,it is suggested that in the search for porphyry-skarn Mo deposits,attention should be paid to the geochemical properties and spatial structure properties of porphyry stocks,and the identification of superimposition metallogenic characteristics of multi-stage magmatic-hydrothermal activities.

外文关键词：

porphyry-skarn Mo depositmelt Mo concentrationmagma chamber volumefluid focusing degreemultiple-stage of magmatic-hydrothermal activities

作者：

欧阳荷根

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作者单位：

中国地质科学院矿产资源研究所,自然资源部成矿作用与资源评价重点实验室,北京 100037

关键词：

斑岩-矽卡岩型钼矿熔体钼含量岩浆体量流体聚集程度多期岩浆-热液活动

基金：

国家重点研发计划国家自然科学基金中央级公益性科研院所基本科研业务费专项

项目编号：

2017YFC060140342372096KK2203

出版年：

2024

DOI：

10.19658/j.issn.1007-2802.2023.42.095

矿物岩石地球化学通报

中国矿物岩石地球化学学会中国科学院地球化学研究所

矿物岩石地球化学通报

CSTPCD北大核心

影响因子：0.912

ISSN：1007-2802

年,卷(期)：2024.43(2)

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