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The Imbrian is a lunar geologic period divided into two epochs, the Early and Late.

Imbrian
3850 – 3200 Ma
Chronology
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Periods on the Lunar Geologic Timescale. Axis scale: Millions of years ago.
Usage information
Celestial bodyEarth's Moon
Time scale(s) usedLunar Geologic Timescale
Definition
Chronological unitPeriod

Contents

In the lunar geologic timescale, the Early Imbrian epoch occurred from 3,850 million years ago to about 3,800 million years ago. It overlaps the end of the Late Heavy Bombardment of the Inner Solar System. The impact that created the huge Mare Imbrium basin occurred at the start of the epoch. The other large basins that dominate the lunar near side (such as Mare Crisium, Mare Tranquillitatis, Mare Serenitatis, and Mare Fecunditatis) were also formed in this period. These basins filled with basalt mostly during the subsequent Late Imbrian epoch. The Early Imbrian was preceded by the Nectarian.

Lunar olivine basalt formed around 3.3 billion years ago. This is part of sample 15555, known as Great Scott.

In the Lunar geologic timescale, the Late Imbrian epoch occurred between 3800 million years ago to about 3200 million years ago. It was the epoch during which the mantle below the lunar basins partially melted and filled them with basalt. The melting is thought to have occurred because the impacts of the Early Imbrian thinned the overlying rock – either causing the mantle to rise because of the reduced pressure on it, bringing molten material closer to the surface, or the top melting as heat flowed upwards through the mantle because of reduced overlying thermal insulation. The majority of lunar samples returned to earth for study come from this epoch.

The Earth equivalent consists of half of the Archean eon.

Since little or no geological evidence on Earth exists from the time spanned by the Early and Late Imbrian epoch of the Moon, the Early and Late Imbrian has been used by at least one notable scientific work as an unofficial subdivision of the terrestrial Hadean eon.


  1. W. Harland; R. Armstrong; A. Cox; L. Craig; A. Smith; D. Smith (1990). A Geologic time scale 1989. Cambridge University Press.


Imbrian Article Talk Language Watch Edit 160 160 Redirected from Upper Imbrian The Imbrian is a lunar geologic period divided into two epochs the Early and Late Imbrian3850 3200 Ma PreN I N E CChronology 4500 4000 3500 3000 2500 2000 1500 1000 500 0 Pre NectarianNectarianImbrianEratosthenianCopernicanLateEarly Periods on the Lunar Geologic Timescale Axis scale Millions of years ago Usage informationCelestial bodyEarth s MoonTime scale s usedLunar Geologic TimescaleDefinitionChronological unitPeriod Contents 1 Early Imbrian 2 Late Imbrian 3 Relationship to Earth s geologic time scale 4 See also 5 ReferencesEarly Imbrian EditIn the lunar geologic timescale the Early Imbrian epoch occurred from 3 850 million years ago to about 3 800 million years ago It overlaps the end of the Late Heavy Bombardment of the Inner Solar System The impact that created the huge Mare Imbrium basin occurred at the start of the epoch The other large basins that dominate the lunar near side such as Mare Crisium Mare Tranquillitatis Mare Serenitatis and Mare Fecunditatis were also formed in this period These basins filled with basalt mostly during the subsequent Late Imbrian epoch The Early Imbrian was preceded by the Nectarian Late Imbrian Edit Lunar olivine basalt formed around 3 3 billion years ago This is part of sample 15555 known as Great Scott In the Lunar geologic timescale the Late Imbrian epoch occurred between 3800 million years ago to about 3200 million years ago It was the epoch during which the mantle below the lunar basins partially melted and filled them with basalt The melting is thought to have occurred because the impacts of the Early Imbrian thinned the overlying rock either causing the mantle to rise because of the reduced pressure on it bringing molten material closer to the surface or the top melting as heat flowed upwards through the mantle because of reduced overlying thermal insulation The majority of lunar samples returned to earth for study come from this epoch The Earth equivalent consists of half of the Archean eon Relationship to Earth s geologic time scale EditSince little or no geological evidence on Earth exists from the time spanned by the Early and Late Imbrian epoch of the Moon the Early and Late Imbrian has been used by at least one notable scientific work 1 as an unofficial subdivision of the terrestrial Hadean eon See also EditHadean eon related topicsReferences Edit W Harland R Armstrong A Cox L Craig A Smith D Smith 1990 A Geologic time scale 1989 Cambridge University Press This geochronology article is a stub You can help Wikipedia by expanding it vte This article related to the Moon is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Imbrian amp oldid 1070071788 Late Imbrian, wikipedia, wiki, book,

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