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Mesoarchean
Sign in to saveAlso known as Mesoarchaean, Mesoarchean Era
The Mesoarchean ( , also spelled Mesoarchaean) is a geologic era in the Archean Eon, spanning , which contains the first evidence of modern-style plate subduction and expansion of microbial life. The era is defined chronometrically and is not referenced to a specific level in a rock section on Earth.
Key facts
- Geologic timespan.name
- Mesoarchean
- Geologic timespan.color
- Mesoarchean
- Geologic timespan.top_bar
- all time
- Geologic timespan.timeline
- Mesoarchean
- Geologic timespan.proposed_boundaries1
- 3490–2780 Ma
- Geologic timespan.proposed_boundaries1_ref
- Gradstein et al., 2012
- Geologic timespan.proposed_subdivision1
- Vaalbaran Period, 3490–3020 Ma
- Geologic timespan.proposed_subdivision1_coined
- Gradstein et al., 2012
- Geologic timespan.proposed_subdivision2
- Pongolan Period, 3020–2780 Ma
- Geologic timespan.proposed_subdivision2_coined
- Gradstein et al., 2012
- Geologic timespan.name_formality
- Formal
- Geologic timespan.alternate_spellings
- Mesoarchaean
- Geologic timespan.celestial_body
- earth
- Geologic timespan.usage
- Global (ICS)
- Geologic timespan.timescales_used
- ICS Time Scale
- Geologic timespan.chrono_unit
- Era
- Geologic timespan.strat_unit
- Erathem
- Geologic timespan.timespan_formality
- Formal
via Wikipedia infobox
Wikidata facts
Show 4 more facts
- Commons category
- Mesoarchean
- sRGB color hex triplet
- F768A9
- start time
- 3200000000
- end time
- 2800000000
Sources (2)
via Wikidata · CC0
~2 min read
Article
6 sectionsContents
- Tectonics
- Environmental conditions
- Early microbial life
- See also
- References
- External links
The Mesoarchean ( , also spelled Mesoarchaean) is a geologic era in the Archean Eon, spanning , which contains the first evidence of modern-style plate subduction and expansion of microbial life. The era is defined chronometrically and is not referenced to a specific level in a rock section on Earth.
== Tectonics == The Mesoarchean era is thought to be the birthplace of modern-style plate subduction, based on geologic evidence from the Pilbara Craton in western Australia. A convergent margin with a modern-style oceanic arc existed at the boundary between West and East Pilbara approximately 3.12 Ga. By 2.97 Ga, the West Pilbara Terrane converged with and accreted onto the East Pilbara Terrane. A supercontinent, Vaalbara, may have existed in the Mesoarchean.