Siderian

Also known as Siderian Period, Siderian System

The Siderian () is the first geologic period in the Paleoproterozoic Era and Proterozoic Eon. It lasted from  to  million years ago (Ma), spanning 200 million years, and is followed by the Rhyacian Period. Instead of being based on stratigraphy, these dates are defined chronometrically.

Key facts

Geologic timespan.name: Siderian
Geologic timespan.color: Siderian
Geologic timespan.top_bar: all time
Geologic timespan.image_outcrop: Banded iron formation Dales Gorge.jpg
Geologic timespan.caption_outcrop: A Siderian banded iron formation in Dales Gorge, Western Australia
Geologic timespan.alt_outcrop: A close-up view of a canyon wall. Red streaks stretch horizontally on the wall, and a few shrubs grow from the surrounding sandstone.
Geologic timespan.image_art: Snowball Huronian.jpg
Geologic timespan.caption_art: Artist's impression of the Earth during the Huronian glaciation, starting from the mid-Siderian
Geologic timespan.alt_art: A 3D rendered image of Earth covered with ice and snow.
Geologic timespan.timeline: Siderian
Geologic timespan.proposed_boundaries1: 2630 – 2420 Ma
Geologic timespan.proposed_boundaries1_ref: Kranendonk et al., 2012
Geologic timespan.proposed_part1: Neoarchean
Geologic timespan.proposed_part1_ref: Kranendonk et al., 2012
Geologic timespan.proposed_boundaries2: 3000? – 2450 Ma
Geologic timespan.proposed_boundaries2_ref: Shields et al., 2021
Geologic timespan.proposed_part2: Neoarchean
Geologic timespan.proposed_part2_ref: Shields al., 2021

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Wikidata facts

Show 5 more facts

start time: 2500000000
end time: 2300000000
sRGB color hex triplet: F74F7C
Commons category: Siderian
IPA transcription: /saɪˈdɪəri.ən/

Sources (2)

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~20 min read

Article

21 sections

Contents

Etymology and history
Paleogeography
Paleotectonics and lithology
Magmatism
Breakup of Kenorland
Climate
Great Oxidation Event
Huronian glaciation
Life
Marine geochemistry
Isotopic composition of iron
Isotopic composition of sulfur
Isotopic composition of nitrogen
Composition of strontium and rubidium
See also
References
Notes
Citations
Sources
Further reading
External links

Most continential activity in this period was met with the breakup of the supercontinent Kenorland. While this event mainly occurred in the craton Laurentia, volcanic intrusions and dike swarms have appeared in plates pertaining to Northwestern Europe, South Africa, and Australia in connection to the rifting. In the ocean, emissions from hydrothermal vents contributed to the production and crystallization of minerals, along with varying concentrations of sulfur and iron. While this sedimentation circulated in the ocean, the amounts deposited on the ocean floor contributed to the development of banded iron formations, along with a diverse range of ores such as pyrite and magnetite.