泥盆纪火山伴生lahn - dill型铁矿的成因。第1部分:铁的活化和矿化方式

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2023-10-19 DOI:10.1007/s00126-023-01218-3
Leanne Schmitt, Thomas Kirnbauer, Thomas Angerer, Rebecca Volkmann, Vladimir Roddatis, Richard Wirth, Sabine Klein
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引用次数: 0

摘要

莱茵地块东部的lahn - dill型氧化铁矿床由赤铁矿和石英组成,少量含菱铁矿、磁铁矿和方解石。矿床位于厚火山碎屑岩层序上盘,标志着中-晚泥盆世界线。从Fortuna矿(Lahn向斜)和Briloner Eisenberg矿(东Sauerland背斜)这两个以前重要的矿床中取样了不同的矿石类型和伴生的下盘岩石,以阐明成矿过程的相互作用。矿床地质、岩石学和全岩地球化学特征表明,矿床主要由深蚀变下盘火山碎屑岩的铁活化、富氢富铁和贫氢流体的喷流、海底沉淀(沉积型)或局部围岩交代置换(置换型)形成。亚微米尺度的岩石学分析表明,沉积型矿石极有可能是由富铁硅凝胶及其伴随的成熟形成的。早期的凝胶结构包括由分散在微晶石英基体中的纳米赤铁矿组成的小球体、聚集体、管状和丝状茎。凝胶内局部成岩Fe3+还原表现为菱铁矿取代赤铁矿。替代型矿石是由(前驱)赤铁矿与碳酸盐共沉淀和赤铁矿交代替代两步过程形成的。这些成矿过程发生在大洋东北部几个受限制的浅海盆地受广泛的火山活动和相关的热液流体通量影响的时期。志留纪至石炭纪类似的火山伴生氧化铁产状也可归类为兰-迪尔型矿石。
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Genesis of Devonian volcanic-associated Lahn-Dill-type iron ores — part I: iron mobilisation and mineralisation style

Fe-oxide deposits of the Lahn-Dill-type in the eastern Rhenish Massif comprise haematite and quartz with minor siderite, magnetite, and calcite. The deposits are located in the hanging wall of thick volcaniclastic rock sequences and mark the Middle to Late Devonian boundary. Varying ore types with accompanying footwall rocks were sampled from two formerly important ore deposits, the Fortuna mine (Lahn syncline) and the Briloner Eisenberg mine (East Sauerland anticline), in order to elucidate the interplay of processes leading to ore formation. Deposit geology, petrography, and whole-rock geochemistry suggest that the ores formed by iron mobilisation from deeply altered footwall volcaniclastic rocks, subsequent venting of a modified H2O-CO2-Fe-rich and H2S-poor fluid, and precipitation on the seafloor (sedimentary-type), or locally by metasomatic replacement of wall rocks (replacement-type). Petrographic analysis to the sub-micron scale revealed that the sedimentary-type ores most likely formed from a Fe-Si-rich gel and accompanying maturation. Early gel textures include the presence of spherules, aggregates, tubes, and filamentous stalks consisting of nanocrystalline haematite dispersed in a matrix of microcrystalline quartz. Local diagenetic Fe3+ reduction within the gel is indicated by siderite replacement of haematite. Replacement-type ores formed due to a two-step process including coprecipitation of (precursor) haematite and carbonates and subsequent metasomatic replacement by haematite. These ore-forming processes took place during a time when several restricted shallow marine basins in the north-eastern Rheic Ocean were influenced by extensive volcanism and associated hydrothermal fluid flux. Examples of similar volcanic-associated Fe-oxide occurrences of Silurian to Carboniferous age can be categorised as being of Lahn-Dill-type ores as well.

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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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