- Neoarchean
Refimprove date February 2009 The Neoarchean pron en ni .o . r ki . n , also spelled Neoarchaean is a geology geologic era geology era within the Archaean . It spans the period of time from Ma 2800 2500 &mdash the period being defined chronometrically and not referenced to a specific level in a rock section on Earth . Oxygenic photosynthesis first evolved in this era and was accountable for the oxygen catastrophe which was to happen later in the paleoproterozoic from a poisonous buildup of oxygen in the atmosphere, produced by these oxygen producing photoautotrophs, which evolved earlier in the Neoarchean. The supercontinent Kenorland formed during this period, about 2.7 billion years ago. Archean Footer Geological history c Category Geologic time scale Category Archaean 4 geochronology stub br Neoarkean ca Neoarque de Neoarchaikum et Neoarhaikum es Era Neoarcaica fr N oarch en id Neoarkean it Neoarcheano lt Neoarch jus hu Neoarchaikum ms Neoarkean nl Neoarche cum nn Neoarkeikum pl Neoarchaik pt Neoarqueano ru sk Neoarchaikum sh Neoarhej fi Neoarkeeinen maailmankausi sv Neoarkeikum vi i T n Th i C zh ... more details
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- Uchi Subprovince
The Uchi Subprovince is a Neoarchean volcanic sequence in Manitoba , Canada . It is the southern margin of the North Caribou terrane and comprises a number of greenstone belt s, which contains volcanic rock s that record some 280 million years of volcanism. Fact date December 2007 See also Portal Volcanism of Canada Volcanism of Canada Volcanism of Western Canada References reflist coord missing Manitoba Category Volcanism of Manitoba Category Greenstone belts Category Neoarchean volcanism Canada geology stub Manitoba geo stub ... more details
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- Cameron River Volcanic Belt
The Cameron River Volcanic Belt is a Neoarchean volcanic belt near the Cameron River in the Northwest Territories , Canada . It contains pillow lava s about 2600 million years old, indicating that great oceanic volcano es existed during the early stages of the formation of the Earth s crust geology crust . See also Portal Volcanism of Canada List of volcanoes in Canada Volcanism of Canada Volcanism of Northern Canada NorthwestTerritories geo stub coord missing Northwest Territories Category Volcanism of the Northwest Territories Category Volcanic belts ... more details
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- Arctica
for the Amberian Dawn single Arctica song Arctica was an ancient continent which formed approximately 2.5 billion years ago in the Neoarchean Era geology era . It consisted of the Canadian Shield Canadian and Siberia continent Siberian Shield geography shield s, and is now roughly situated in the Arctic around the current North Pole . Arctica joined with the continents Atlantica and Nena supercontinent Nena about one billion years ago to form the supercontinent , Rodinia . See also List of supercontinents External links Continents of the world Category Historical continents Category Archaean Category Proterozoic Category Natural history of Asia Category Natural history of North America Category Prehistory of the Arctic palaeogeography stub de Arctica Kontinent it Arctica nl Arctica geologie nn Arktika vi Arctica zh ... more details
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- Red Lake greenstone belt
The Red Lake greenstone belt is an Archean greenstone belt at the town of Red Lake, Ontario Red Lake in Northwestern Ontario , Canada . It consists of basalt ic and komatiite komatiitic volcanics ranging in age from 2,925 to 2,940 million years old and younger rhyolite andesite volcanics ranging in age from 2,730 to 2,750 million years old. ref http www.cseg.ca conventions abstracts 2004 2004abstracts 055S0131 Zeng F Abstract Tomograpy.pdf Fafu Zeng and Andrew J. Calvert, A Combined Seismic Tomographic and Reflection Imaging Across the Red Lake Greenstone Belt Using LITHOPROBE Line 2B, abstract ref See also Portal Volcanism of Canada Volcanism in Canada List of greenstone belts References reflist coord missing Ontario Greenstone belts Category Volcanism of Ontario Category Greenstone belts Category Mesoarchean volcanism Category Neoarchean volcanism Canada geology stub ... more details
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- Sturgeon Lake Caldera
Infobox mountain name Sturgeon Lake Caldera photo photo caption elevation approx. convert 455 m ft 0 abbr on prominence listing List of volcanoes in Canada location Ontario , Canada range coordinates coord 49 52 13 N 91 00 10 W type mountain region CA topo type Caldera age Neoarchean volcanic arc belt Wabigoon greenstone belt last eruption Neoarchean first ascent easiest route Sturgeon Lake Caldera is a large extinct volcano extinct caldera complex in Kenora District, Ontario Kenora District of Northwestern Ontario , Canada . It is one the world s best preserved mineralization geology mineralized Neoarchean caldera complexes, containing well preserved mafic intermediate pillow lava s, pillow breccia s, hyaloclastite and peperite s, submarine lava dome s and dome associated breccia deposits. The complex is some 2.7 billion years old ref http www.d.umn.edu rmorton ronshome Volcanoes calderas.html Caldera Volcanoes Retrieved on 2007 07 20 ref with a minimum Strike and dip strike length of convert 30 km mi 0 abbr on . Geology The Sturgeon Lake Caldera contains a well preserved north facing homoclinal chain of greenschist facies metamorphism metamorphosed intrusion intrusive , volcanic rock volcanic , and sedimentary rock sedimentary layers. This piecemeal caldera complex includes nearly convert 3000 m ft 0 abbr on of major subaqueously deposited intracaldera fill. Episodes of subaerial and subaqueous explosive felsite felsic volcanism created Rhyodacite rhyodacitic to rhyolite rhyolitic tuff s and lapilli tuffs. The caldera complex lies in the Wabigoon greenstone belt. The Sturgeon Lake Caldera contains volcanic units that outcrop over 30 kilometers from east to west with up to five separate, major ash flow tuff units with thickness ranging from convert 100 m ft 0 abbr on to convert 1200 m ft 0 abbr on . The Mattabi pyroclastic flow, with a thickness in excess of convert 800 m ft 0 abbr on and a strike length of at least convert 30 km mi 0 abbr on , is the third and mos ... more details
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- Eratosthenian
Unreferenced stub auto yes date December 2009 Lunar geo time The Eratosthenian period in the lunar geologic timescale runs from 3,200 million years ago to 1,100 million years ago. It is named after the Eratosthenes crater crater Eratosthenes , whose formation marks the beginning of this period. The formation of the Copernicus lunar crater crater Copernicus marks its end, and the beginning of the subsequent Copernician Period. The massive basaltic volcanism of the Imbrian period tapered off and ceased during this long span of lunar time. The youngest lunar lava flows identified from orbital images are tentatively placed near the end of this period. Its Earth equivalent consists of most of the Neoarchean era Archean eon , Paleoproterozoic and Mesoproterozoic eras Proterozoic eon . Timeline Lunar Geological Timescale Category Lunar geologic periods Moon stub br Eratostenian ca Eratosteni da Eratosthenian es Per odo Eratosteniano fr ratosth nien it Eratosteniano nl Eratosthenium ru sv Eratosthenian vi K Eratosthenes ... more details
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- Abitibi greenstone belt
Image Canadianshield.gif right thumb Canadian Shield The Abitibi greenstone belt is a 2,800 2,600 million year old greenstone belt that spans across the Ontario Quebec border in Canada . It is mostly made of volcanic rock s, but also includes ultramafic rock s, mafic intrusion s, granitoid rock s, and early and middle Precambrian sediments. ref http user.uni frankfurt.de lahaye fieldtrip html abitibitx.html Archean greenstone belt Retrieved on 2007 09 26 ref Geographical extent The Abitibi greenstone belt is one of the world s largest Archean greenstone belts. It appears to represent a series of thrusted subterranes that exhibit similar geological, geochemical, and isotopical signatures as those formed during the evolution of paired active arc back arc systems. The huge 2,707 2,696 million year old Blake River Megacaldera Complex is within the belt. See also Portal Volcanism of Canada Volcanism of Canada Volcanism of Eastern Canada List of greenstone belts References Reflist DEFAULTSORT Abitibi Greenstone Belt Category Volcanism of Ontario Category Volcanism of Quebec Category Neoarchean volcanism Category Greenstone belts Greenstone belts Ontario geo stub Quebec geo stub ... more details
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- Iceland Lake Pluton
The Iceland Lake Pluton , formerly known as the Ingall Lake Batholith , is a large granite granitic intrusion in Briggs Township, Ontario Briggs and Strathcona Township, Ontario Strathcona townships of Temagami , Northeastern Ontario , Canada . It is one the three separate granitoid intrusions that constitute the Temagami greenstone belt , consisting of rocks ranging from diorite to quartz monzonite . The age of the intrusion is estimated to be about 2,736 billion years old, as well as an adjacent rhyolite rhyolitic lava flow using the uranium lead dating technique. This suggests that the Iceland Lake Pluton might be the remnants of a magma chamber of a volcano that erupted felsic magma . The pluton is overlain by sediment s of the younger Huronian Supergroup . Chlorite trondhjemite of the Iceland Lake Pluton is exposed along the Lake Temagami Access Road and Iceland Lake. ref http google.brand.edgar online.com EFX dll EDGARpro.dll?FetchFilingORIG1?ID 2430554&SessionID d oyHv7XX3XYes7 ref See also Portal Volcanism of Canada Spawning Lake Stock Chambers Strathy Batholith Notes reflist References http rparticle.web p.cisti.nrc.ca rparticle AbstractTemplateServlet?calyLang eng&journal cjes&volume 28&year 0&issue 11&msno e91 167 Age and timing of igneous activity in the Temagami greenstone belt, Ontario a preliminary report cite journal author year title Arsenic Lake Property journal volume issue pages id Afri 31M04SW0141 Category Geology of Temagami Category Volcanism of Ontario Category Neoarchean volcanism Category Batholiths Canada geology stub Ontario stub ... more details
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- List of supercontinents
I have copy and pasted these three article into my user page Supercontinent section , List of supercontinents and Supercontinent cycle . The new and improved lol article will be name Supercontinent . When I am finished, I will move the new Supercontinent article to Wikipedia. This process takes me a month or two. User Bettymnz4 Bettymnz4 User talk Bettymnz4 talk 22 34, 5 April 2010 UTC Unreferenced date January 2009 This is a list of supercontinent supercontinents . The list is written in reverse chronological order stratolithic order comprising nearly all land at the time. Present day Afro Eurasia 5 mya present day Americas 15 mya present day Eurasia 60 mya present day Prehistoricals Gondwana 300 30 million years ago Laurasia 300 60 million years ago Pangaea 300 180 million years ago Euramerica 300 million years ago Oldredia 418 380 million years ago Pannotia , also called Vendian 600 540 million years ago Rodinia 1.1 Giga annum Ga 750 million years ago Columbia supercontinent Columbia , also called Nuna 1.8 1.5 Ga ago Nena supercontinent Nena 1.8 Ga Kenorland 2.7 Ga ago . Neoarchean sanukitoid cratons and new continental crust formed Kenorland. Protracted tectonic magna plume rifting occurred 2.48 to 2.45 Ga and this contributed to the Paleoproterozoic glacial events in 2.45 to 2.22 Ga. Final breakup occurred 2.1 Ga. Ur continent Ur 3 Ga ago . Classified as the earliest known landmass. Ur, however, was probably the largest, perhaps even the only continent three billion years ago. While probably not a supercontinent, one can argue that Ur was a supercontinent for its time, even if it was smaller than Australia is today. Still, an older rock formation now located in Greenland dates back from Hadean times. Vaalbara 3.6 Ga ago . Evidence is the Yilgarn Craton, Western Australia and the worldwide Archean greenstone belts that were subsequently spread out across Gondwana and Laurasia. Possible future Pangaea Ultima Amasia continent Amasia Novopangaea External links http ... more details
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- Erathem
, and the Archean eon and eonothem are divided similarly into the Neoarchean , Mesoarchean , Paleoarchean ... more details
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- Graphical timeline of the universe
text Neoarchean color neoarchean from 3200000000 till 2800000000 text Mesoarchean color mesoarchean ... more details
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- Churchill craton
, Yathkyed, MacQuoid and Rankin supracrustal belts, containing a wide range of intrusive Neoarchean ... more details
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- Superior craton
Province. A suite of Neoarchean monzodiorite intrusion s from greenstone belt s of the western ... to high magnesium andesite from Japan known as Sanukitoid sanukite . Neoarchean volcano plutonic ... of a 2.745 2.69 Ga Neoarchean intrusion pluton called the Berens River Plutonic Complex. It is intruded ... rocks variably intruded by Neoarchean plutons and 2 a largely Neoarchean plutonic domain, formerly ... greenstone belt are also considered part of the Winnipeg River terrane. Significant pulses of Neoarchean ... at ca. 2.70 2.69 Ga. A complex Neoarchean structural metamorphic history began with deposition ... of Neoarchean structures have been recognized in complex tonalitic gneisses. The Marmion ... share much of the same characteristics as the Neoarchean shonitic rocks from other western ... more details
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- List of volcanoes in Canada
52 13 N 91 00 10 W type mountain region CA Neoarchean align right align left Manitou Islands Lake ... Megacaldera Complex coord 48 14 58 N 79 20 29 W type mountain region CA Neoarchean align right align left Misema Caldera coord 48 14 58 N 79 24 15 W type mountain region CA Neoarchean align right align ... Complex coord 48 14 58 N 79 20 29 W type mountain region CA Neoarchean align right align left New Senator Caldera coord 48 26 53 N 79 24 15 W type mountain region CA Neoarchean align right align left Noranda Caldera coord 48 17 44 N 79 08 26 W type mountain region CA Neoarchean align right align left Misema Caldera coord 48 14 58 N 79 24 15 W type mountain region CA Neoarchean align right ... more details
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- Canadian Shield
mineralization geology mineralized Neoarchean caldera complexes, which is some 2.7 billion years ... continent called Arctica , which was formed about 2.5 billion years ago, during the Neoarchean era ... more details
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- Cryogenian
Geological period image The Cryogenian from Greek language Greek cryos cold and genesis birth is a geologic period that lasted from Mya 850 635 . It forms the second geology geologic geologic period period of the Neoproterozoic era geology Era , preceded by the Tonian Period and followed by the Ediacaran . The Sturtian and Marinoan glaciation s, ref These events were formerly considered together as the Varanger glaciations, from their first detection in Norway s Varanger Peninsula . ref which are the greatest ice ages known to have occurred on Earth and may have covered the entire planet, occurred during this period. These so called Snowball Earth snowball earth events are the subject of much scientific controversy. The main debate involves whether these glaciations were truly global or merely localised events. The period has not received the international ratification mention from whom that all geological time periods undergo the most recent being the Ediacaran Period, which was ratified in 2004 . The start of the period is defined only on the ages of the rocks and not on any observable and documented global event. This is problematic as estimates of rock ages are variable and are subject to laboratory error. For instance, the Cambrian Period is marked not by rock younger than a given age period start Cambrian million years , but by the appearance of the worldwide Treptichnus pedum diagnostic trace fossil assemblage. This means that rocks can be recognised as Cambrian when examined in the field and do not require extensive testing to be performed in a lab to find a date. As yet, there is no consensus on what global event is a suitable candidate to mark the start of the Cryogenian Period, and its base is only loosely set to expr switch lc Cryogenian hadean 4567.17 archean eoarchean 3800 paleoarchean palaeoarchean 3600 mesoarchean 3200 neoarchean 2800 proterozoic paleoproterozoic palaeoproterozoic siderian 2500 rhyacian 2300 orosirian 2050 statherian 1800 mesoprotero ... more details
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- List of lava domes
Sturgeon Lake Caldera Wabigoon greenstone belt Neoarchean Tadeda Peak Northern Cordilleran ... more details
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- Kaapvaal craton
that formed large amounts of granitic melt. Chavagnac et al. , 1999 . There is no indication that the Neoarchean ... abstract 78610.htm Timing and Provenance of Neoarchean Paleoproterozoic Unconformity Bounded ... more details
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- Vaalbara
cite journal title Paleomagnetism of selected neoarchean paleoproterozioc cover sequences on the Kaapvaal ... more details
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- Kenora District
District contains the Sturgeon Lake Caldera , which is one of the world s best preserved Neoarchean ... more details
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- Timeline of the Precambrian
shield , formed at 3100 Ma ago. 2800 Ma Neoarchean Era starts. 2800 Ma Breakup of the Vaalbara ... more details
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- Temagami greenstone belt
of magnetite typical of Neoarchean 2,800 2,500 million year old banded iron formations Layered ... more details
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- Caldera
s best preserved mineralized calderas is the Neoarchean Sturgeon Lake Caldera in northeastern Ontario ... more details
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- Algoman orogeny
Neoarchean trans subprovince sediment trasnport in southwestern Superior Province sedimentological, geochemical ... more details
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