Mineralogy and geochemistry of atypical reduction spheroids from the Tumblagooda Sandstone, Western Australia

Fox, David; Spinks, Sam; Thorne, Robert L.; Barham, Milo; Aspandiar, Mehrooz; Armstrong, Joe; Uysal, Tonguc; Timms, Nicholas E.; Pearce, Mark A.; Verrall, Michael; Godel, Bélinda; Whisson, Brad

doi:10.1111/sed.12659

Cited by 2 publications

(2 citation statements)

References 53 publications

(78 reference statements)

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“…Many researchers refer to such light bands as secondary reduction zones [7]. Geologists have been observing secondary reduction zones for almost as long as the color has been discussed in the literature [32,[72][73][74][75]. According to the mineralogical characteristics and geochemical properties of secondary reduction zones in red beds, two categories have been identified: leaching zones and reduction zones.…”

Section: Reduction and Leachingmentioning

confidence: 99%

“…Some researchers have suggested that the higher concentration of metallic elements such as copper in the reduction spots may be due to adsorption by organic matter [76][77][78]. More researchers have suggested that the formation of reduction spots containing dark cores is better attributed to the activity of bacteria or microorganisms that use organic matter as an energy source and reducing agent, allowing the dissolution of metallic elements and their precipitation in the cores of the reduction spots through bacterial-mediated reduction [74,75,81,[83][84][85].…”

Section: Reduction Spotsmentioning

confidence: 99%

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Micro-Mechanisms and Implications of Continental Red Beds

Yang

et al. 2022

Minerals

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Continental red beds, widely formed at various geologic timescales, are sedimentary rocks and sediments with red as the main color. Geoscientists have analyzed the geomorphology, paleomagnetism, paleoenvironments, paleontology, energy, and minerals in continental red beds. Despite the agreement that fine-grained hematite is closely related to the color of continental red beds, controversies and problems still exist regarding the micro-mechanism of their formation. As a review, this paper details the composition and color properties of pigmentation in red beds, analyzes the existence and distribution of authigenic hematite, and summarizes the iron sources and the formation of hematite. In addition, we introduce the fading phenomenon observed in continental red beds, including three types of secondary reduction zones: reduction spots, reduction strips, and reduction areas. Lastly, this paper summarizes the evolution of color in continental red beds, emphasizes the relationship between authigenic hematite and the diagenetic environment, and proposes possible research directions for future red bed-related issues.

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