Wikipedia

Mesoproterozoic

(Redirected from Middle Proterozoic)
Not to be confused with Mesozoic.

The Mesoproterozoic Era[4] is a geologic era that occurred from 1,600 to 1,000 million years ago. The Mesoproterozoic was the first era of Earth's history for which a fairly definitive geological record survives. Continents existed during the preceding era (the Paleoproterozoic), but little is known about them. The continental masses of the Mesoproterozoic were more or less the same ones that exist today, although their arrangement on the Earth's surface was different.

Mesoproterozoic
1600 – 1000 Ma
Banded fine-grained pyrite found in the Urquhart Shale, Australia
Chronology
Proposed redefinition(s)1780–850 Ma
Gradstein et al., 2012
Proposed subdivisionsRodinian Period, 1780–850 Ma
Gradstein et al., 2012
Etymology
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitEra
Stratigraphic unitErathem
Time span formalityFormal
Lower boundary definitionDefined Chronometrically
Lower GSSA ratified1991[1]
Upper boundary definitionDefined Chronometrically
Upper GSSA ratified1991[1]

Major events and characteristics

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The major events of this era are the breakup of the Columbia supercontinent, the formation of the Rodinia supercontinent,[5] and the evolution of sexual reproduction.[6]

This era is marked by the further development of continental plates and plate tectonics. The supercontinent of Columbia broke up between 1500 and 1350 million years ago,[5] and the fragments reassembled into the supercontinent of Rodinia around 1100 to 900 million years ago, on the time boundary between the Mesoproterozoic and the subsequent Neoproterozoic.[7] These tectonic events were accompanied by numerous orogenies (episodes of mountain building) that included the Kibaran orogeny in Africa;[8] the Late Ruker orogeny in Antarctica;[9] the Gothian[10] and Sveconorwegian orogenies in Europe;[11] and the Picuris and Grenville orogenies in North America.[12]

The era saw the development of sexual reproduction, which greatly increased the complexity of life to come and signified the start of development of true multicellular organisms.[6][13] Though the biota of the era was once thought to be exclusively microbial, recent finds have shown multicellular life did exist during the Mesoproterozoic.[14][6] This era was also the high point of the stromatolites before they declined in the Neoproterozoic.[15]

Subdivisions

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See also: Riphean (stage) and Jotnian

The subdivisions of the Mesoproterozoic are arbitrary divisions based on time. They are not geostratigraphic or biostratigraphic units. The decision to base the Precambrian time scale on radiometric dating reflects the sparse nature of the fossil record, and Precambrian subdivisions of geologic time roughly reflect major tectonic cycles. It is possible that future revisions to the time scale will reflect more "natural" boundaries based on correlative geologic events.[16]

The Mesoproterozoic is presently divided into the Calymmian (1600 to 1400 Mya) and the Ectasian (1400 to 1200 Mya), and the Stenian (1200 to 1000 Mya). The Calymmian and Ectasian were characterized by stabilization and expansion of cratonic covers and the Stenian by formation of orogenic belts.[16]

The time period from 1780 Ma to 850 Ma, an unofficial period based on stratigraphy rather than chronometry, named the Rodinian, is described in the geological timescale review 2012 edited by Gradstein et al.,[17] but as of February 2017, this has not yet been officially adopted by the International Union of Geological Sciences (IUGS).

See also

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References

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  1. ^ a b Plumb, K. A. (June 1, 1991). "New Precambrian time scale". Episodes. 14 (2): 139–140. doi:10.18814/epiiugs/1991/v14i2/005.
  2. ^ "Meso". CollinsDictionary.com. HarperCollins. Retrieved 2023-08-30.
  3. ^ "Proterozoic". Merriam-Webster.com Dictionary. Merriam-Webster.
  4. ^ There are several ways of pronouncing Mesoproterozoic, including IPA: /ˌmɛzəˌproʊtərəˈzoʊɪk, ˌmɛzoʊ-, ˌmɛs-, ˌmiːz-, ˌmiː.s-, -ˌprɒt-, -əroʊ-, -trə-, -troʊ-/ MEZ-ə-PROH-tər-ə-ZOH-ik, MEZ-oh-, MESS-, MEE-z-, MEE-s-, -⁠PROT-, -⁠ər-oh-, -⁠trə-, -⁠troh-.[2][3]
  5. ^ a b Zhao, G.; Sun, M.; Wilde, S. A.; Li, S. (2004). "A Paleo-Mesoproterozoic supercontinent: assembly, growth and breakup". Earth-Science Reviews. 67 (1): 91–123. Bibcode:2004ESRv...67...91Z. doi:10.1016/j.earscirev.2004.02.003. Retrieved 14 February 2016.
  6. ^ a b c Butterfield, Nicholas J. (2000). "Bangiomorpha pubescens n. gen., n. sp.: implications for the evolution of sex, multicellularity, and the Mesoproterozoic/Neoproterozoic radiation of eukaryotes". Paleobiology. 26 (3): 386. doi:10.1666/0094-8373(2000)026<0386:BPNGNS>2.0.CO;2. S2CID 36648568. Retrieved 12 April 2021.
  7. ^ Li, Z. X.; Bogdanova, S. V.; Collins, A. S.; Davidson, A.; De Waele, B.; Ernst, R. E.; Fitzsimons, I. C. W.; Fuck, R. A.; Gladkochub, D. P.; Jacobs, J.; Karlstrom, K. E.; Lul, S.; Natapov, L. M.; Pease, V.; Pisarevsky, S. A.; Thrane, K.; Vernikovsky, V. (2008). "Assembly, configuration, and break-up history of Rodinia: A synthesis" (PDF). Precambrian Research. 160 (1–2): 179–210. Bibcode:2008PreR..160..179L. doi:10.1016/j.precamres.2007.04.021. Retrieved 6 February 2016.
  8. ^ Tack, L.; Wingate, M.T.D.; De Waele, B.; Meert, J.; Belousova, E.; Griffin, B.; Tahon, A.; Fernandez-Alonso, M. (2008). "The 1375 Ma "Kibaran Event" in Central Africa: prominent emplacement of bimodal magmatism under extensional regime" (PDF). Precambrian Research. 180 (1–2): 63–84. doi:10.1016/j.precamres.2010.02.022. Retrieved 2012-06-11.
  9. ^ Anderson, John B. (1999). "Antarctic Marine Geology". Cambridge University Press. pp. 30–32. ISBN 9780521593175.
  10. ^ Lundqvist, Jan; Lundqvist, Thomas; Lindström, Maurits; Calner, Mikael; Sivhed, Ulf (2011). "Sydvästskandinaviska provinsen". Sveriges Geologi: Från urtid till nutid (in Swedish) (3rd ed.). Spain: Studentlitteratur. ISBN 978-91-44-05847-4.
  11. ^ Andesson, Jenny; Bingen, Bernard; Cornell, David; Johansson, Leif; Möller, Charlotte (2008). "The Sveconorwegian orogen of southern Scandinavia: setting, petrology and geochronology of polymetamorphic high-grade terranes". 33 IGC excursion No 51, August 2 – 5.
  12. ^ Whitmeyer, Steven; Karlstrom, Karl E. (2007). "Tectonic model for the Proterozoic growth of North America". Geosphere. 3 (4): 220. doi:10.1130/GES00055.1.
  13. ^ Bai, Shu-Nong (23 January 2015). "The concept of the sexual reproduction cycle and its evolutionary significance". Frontiers in Plant Science. 6: 11. doi:10.3389/fpls.2015.00011. PMC 4304253. PMID 25667590.
  14. ^ Troppenz, Uwe-Michael; Littkowski, Sven (3 May 2019). "The Mesoproterozoic – no "boring billion"" (PDF). Iranian Journal of Earth Sciences. 11 (4): 239–243. Retrieved 25 November 2022.
  15. ^ Allwood, Abigail; Grotzinger; Knoll; Burch; Anderson; Coleman; Kanik (2009). "Controls on development and diversity of Early Archean stromatolites". Proceedings of the National Academy of Sciences. 106 (24): 9548–9555. Bibcode:2009PNAS..106.9548A. doi:10.1073/pnas.0903323106. PMC 2700989. PMID 19515817.
  16. ^ a b Ogg, James (June 2004). "Status of Divisions of the International Geologic Time Scale". Lethaia. 37 (2): 183–199. doi:10.1080/00241160410006492.
  17. ^ Gradstein, F.M.; et al., eds. (2012). The Geologic Time Scale 2012. Vol. 1. Elsevier. p. 361. ISBN 978-0-44-459390-0.
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