Rhyacium

Aeonothem	Arathem	system	Age ( mya )
later	later	later
P r o t e r o z o i k u m Duration: 1959 Ma	Neoproterozoic Jungproterozoikum Duration: 459 Ma	Ediacarium	541 ⬍ 635
		Cryogenium	635 ⬍ 720
		Tonium	720 ⬍ 1000
	Mesoproterozoic Mittelproterozoikum Duration: 600 Ma	Stenium	1000 ⬍ 1200
		Ectasium	1200 ⬍ 1400
		Calymmium	1400 ⬍ 1600
	Paleoproterozoic Altproterozoikum Duration: 900 Ma	Statherium	1600 ⬍ 1800
		Orosirium	1800 ⬍ 2050
		Rhyacium	2050 ⬍ 2300
		Siderium	2300 ⬍ 2500
earlier	earlier	earlier

The rhyacian is the second geological period within the eon Proterozoikum (and within the era Paleoproterozoic ). It took 250 million years. Its beginning is radiometrically set at 2300 million years BP and its end at 2050 million years BP. The rhyacium follows the period of the siderium and is replaced by the orosirium .

Naming

The name Rhyacium is derived from the Greek Ρυαξ - Rhyax = lava flow . He plays on the penetration of layered intrusions, such as Take for example the Bushveld Complex in South Africa.

stratigraphy

Significant sedimentary basins and geological formations

Hamersley Basin in Western Australia :
- Turee Creek Group - 2,449 to 2209 million years old BP
Ashburton Basin in Western Australia - 2209 to 1800 million years old BP
- Lower Wyloo Group - million years BP - around 2209 million years BP
Yerida Basin in Western Australia - 2200 to 1900 million years BP
Transvaal Basin in South Africa - 2600 to 1900 million years BP
Franceville Basin in Gabon - around 2100 million years BP
Animikie Group in the United States and Canada - 2,500 to 1,800 million years old BP
Huronian Supergroup in Eastern Ontario - 2,450 to 2,219 million years BP
Marquette Range Supergroup in Northern Wisconsin and Michigan - 2207 to 1818 million years BP

Geodynamics

Orogenesis

Continent collisions:

Ophthalmian Orogeny in Western Australia: Collision of the Glenburgh Terran with the southern rim of the Pilbara Craton - 2215 to 2145 million years BP
Transamazon orogeny in South America - 2100 to 2000 million years BP
Eburnian Orogeny in West Africa - 2100 to 2000 million years BP

Events during the Rhyacium

climate

The Huronian Ice Age (Makganyene glaciation) ended in the Rhyacium and is estimated to be between 2,400 and 2,100 million years ago.

evolution

Gabonionta, earliest form of multicellular, eukaryotic life on earth

The eukaryota began to develop during the Rhyacium. In addition, with the Gabonionta in the 2100 million year old Francevillian Group, the origin of multicellular life took place.

literature

James G. Ogg: Status on Divisions of the International Geologic Time Scale. Archived from the original on September 29, 2007. In: Lethaia . 37, 2004, pp. 183-199. doi : 10.1080 / 00241160410006492 .
Kenneth A. Plumb: New Precambrian time scale. In: Episodes, 14 (2), Beijing 1991, pp. 134-140, ISSN 0705-3797 .

Web links

International Stratigraphic Chart 2009 (PDF; 485 kB)

Individual evidence

↑ James G. Ogg: Status on Divisions of the International Geologic Time Scale . In: Lethaia . tape 37 (2) , 2004, pp. 183-199 .
↑ Rebekah Lundquist: Provenance Analysis of the Marquette Range Supergroup sedimentary rocks using U-Pb Isotope geochemistry on detrital zircons by LA-ICP-MS . In: 19th annual Keck Symposium . 2006.
↑ Gabonionta, the little revolutionaries of evolution. In: derstandard.at . Retrieved February 5, 2015.
↑ Gabonionta: How Mehrzeller tried to conquer the earth. In: nachrichten.at . Retrieved February 5, 2015.

[1] James G. Ogg: Status on Divisions of the International Geologic Time Scale . In: Lethaia . tape 37 (2) , 2004, pp. 183-199 .

[2] Rebekah Lundquist: Provenance Analysis of the Marquette Range Supergroup sedimentary rocks using U-Pb Isotope geochemistry on detrital zircons by LA-ICP-MS . In: 19th annual Keck Symposium . 2006.

[3] Gabonionta, the little revolutionaries of evolution. In: derstandard.at . Retrieved February 5, 2015.

[4] Gabonionta: How Mehrzeller tried to conquer the earth. In: nachrichten.at . Retrieved February 5, 2015.