四川轿顶山锰钴矿床含矿岩系岩石地球化学特征及成矿规律  

Petro-geochemical Characteristics and Metallogenic Regularity of Ore-bearing Rock Series of Jiaodingshan Mn-Co Deposit,Sichuan Province

作　　者：徐云峰[1,2] 秦宇龙 李名则[1,2] 熊昌利 白宪洲[1,2] 张彤 武文辉[1,2] 詹涵钰 吴建亮[1,2] 王显锋 XU Yunfeng;QIN Yulong;LI Mingze;XIONG Changli;BAI Xianzhou;ZHANG Tong;WU Wenhui;ZHAN Hanyu;WU Jianliang;WANG Xianfeng(Sichuan Geological Survey Institute,Chengdu 610081,China;Sichuan Provincial Key Laboratory of Evaluation and Utilization of Strategic Rare Metals and Rare Earth Resource,Chengdu 610081,China)

机构地区：[1]四川省地质调查院,四川成都610081 [2]稀有稀土战略资源评价与利用四川省重点实验室,四川成都610081

出　　处：《金属矿山》2023年第6期134-144,共11页Metal Mine

基　　金：四川省自然资源厅项目(编号:DZ202108,Kj-2022-(24))。

摘　　要：汉源县轿顶山锰钴矿是四川省最早发现的优质锰钴矿床,是四川省重要的锰钴资源基地。为探讨其沉积环境、物源区背景及进一步研究矿床成矿规律,进行了含矿岩系的岩石地球化学分析。结果表明:轿顶山锰钴矿床属海相化学沉积型,主要受藻礁控制,沉积环境为氧化—还原过渡环境。原始沉积物质主要成分为上地壳长英质,但沉积时有少量基性物质、古老沉积物等成分混入;物源区构造背景由被动大陆边缘过渡至大陆岛弧构造背景;轿顶山锰钴矿产于开阔台地外侧的水下隆起附近,由藻类吸附锰质等形成;晚奥陶世—早志留世,区域上发生了海底火山活动,并带出锰、钴等物质,使整个海域都富成矿物质,为锰钴矿的形成提供了物质来源基础;海底火山活动带出的Co、Mn、Ni等随海流运移至藻礁区域,改变了周围水域的物理化学性质,藻类选择性地吸附Co、Mn、Ni等元素,导致Co、Mn、Ni等物质大量沉淀,从而形成了含Co、Ni较高的菱锰矿。Jiaodingshan Mn-Co Deposit in Hanyuan County is the earliest discovered high-quality manganese-cobalt deposit in Sichuan Province.It is also an important manganese-cobalt resource base in Sichuan Province.In order to investigate the sedimentary environment and material provenance,and further explore the metallogenic regularity of the Jiaodingshan Mn-Co Deposit,petro-geochemical analysis of ore-bearing rock series of the Jiaodingshan area was done.The results show that the Jiaodingshan Mn-Co Deposit belongs to the marine chemical depositional type,and it is mainly controlled by algal reefs.It formed in oxidation-reduction transitional environment.The main components of the original sedimentary material are felsic material in the upper crust,while there was also a small amount of basic rocks,ancient sediments and other components mixed during the deposition process.The tectonic settings of the material provenance area transitioned from the passive continental margin to the continental island arc.The Jiaodingshan Mn-Co Deposit formed near the underwater uplift outside the open platform and by the adsorption of manganese by algae.During the period of Late Ordovician-Early Silurian,regional submarine volcanic activity brought out manganese,cobalt and other substances,which made the entire sea area rich in ore-forming materials and provided a material source for the formation of Mn-Co deposit.The elements of Co,Mn,Ni,etc.carried by submarine volcanic activity were migrated to the algal reef area by the ocean current,changing the physical and chemical properties of the surrounding waters.The algae selectively adsorbed Co,Mn,Ni and other elements,which caused a large number of Co,Mn,Ni and other substances deposited and formed rhodochrosite with high contents of Co and Ni.

关 键 词：锰钴矿 岩石地球化学特征 沉积环境 成矿规律 构造背景 菱锰矿 

分 类 号：TD11[矿业工程—矿山地质测量] P612[天文地球—矿床学]