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Cycles of hydrothermal activity, precipitation of chemical sediments, with special reference to Algoma-type BIF
Gondwana Research ( IF 6.1 ) Pub Date : 2021-03-02 , DOI: 10.1016/j.gr.2021.02.012
Franco Pirajno , Hao-Cheng Yu

In this contribution, we present the more or less consistent banding (mm to several cm) from Fe-rich to silica-rich chemical sediments associated with the venting that leads to the formation of banded sediments in several hydrothermal mineral systems, such as volcanogenic massive sulphides (VMS) and sedimentary exhalative (SEDEX) deposits. However, in this contribution we specifically refer to the banded sediments that are commonly known as Algoma-type iron formation (BIF). Algoma-type BIF does provide a somewhat unusual and poorly investigated case of chemical sediments banding. The banding of these chemical sediments in terms of Fe oxides and silica is related to their alternate dominance in the upwelling fluids in a variety of settings ranging from a sea floor spreading centre to continental rift-related settings. Equally important is the concept that Algoma-type BIF may well be associated with and a distal expression of sulphide-bearing mineral systems.



中文翻译:

热液活动的周期,化学沉积物的沉淀,特别是针对Algoma型BIF

在这项贡献中,我们介绍了从富铁到富硅的化学沉积物与通气有关的带状带(从几毫米到几厘米),这些带状带与通气有关,导致在多个热液矿物系统中形成带状沉积物,例如火山成因块状。硫化物(VMS)和沉积性呼气(SEDEX)沉积物。但是,在此贡献中,我们特别指的是通常称为Algoma型铁形成物(BIF)的带状沉积物。Algoma型BIF确实提供了某种不同寻常且研究较少的化学沉积物条带化案例。这些化学沉积物在Fe氧化物和二氧化硅方面的带状作用与从海床扩展中心到大陆裂谷相关设置的各种设置中,它们在上升流流体中的交替优势有关。

更新日期:2021-03-02
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