Examples of 'archean' in a sentence
Meaning of "archean"
Archean (adjective): Relating to or denoting the eon that preceded the Proterozoic, from about 4,000 to 2,500 million years ago, including the formation of the Earth's crust and atmosphere
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- Alternative form of Archaean
How to use "archean" in a sentence
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archean
Archean wall rocks are not altered.
The sequence is intruded by as archean granite of the mato dentro intrusive suite.
Archean felsic volcanic activities commonly occur in submarine environments.
The local geology is represented by metamorphic rocks from archean to proterozoic ages.
Archean subcontinental mantle.
Detrital zircons analyzed in this sequence indicated a paleoproterozoic source area with minor archean contribution.
Archean rocks are varied and comprise intrusive complexes and supracrustal belts.
The area sits on ancient Archean rocks.
Its Archean counterpart is represented in red.
They are important to reconstruct Archean geological environments.
The Archean was this cardinal epoch of biochemical innovation.
There are two types of Archean orogenic belts.
Komatiites are largely restricted to the Archean.
It consists mainly of Archean rock formations.
No Archean crust have been found west of this suture.
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It contains a late Archean granulite basement.
All these rocks are considered or Archean age.
The Archean atmosphere is thought to have lacked free oxygen.
The ages matched characteristic outcropping Archean orthogneisses.
The end of the Archean is marked by the disappearance of methane.
The area is composed of Archean rocks ca.
The Archean to the oxygenated atmosphere that we have today.
The zircons are limited only to Archean cratons.
Coupled evolution of Archean continental crust and subcontinental lithospheric mantle.
The area has been tectonically quiescent since the Archean.
Iron from seawater in the Archean indicates that.
Archean anorthosites represent the second largest anorthosite deposits on Earth.
There were no large continents until late in the Archean period.
Archean will be the operator of the Project during the option period.
Felsic granitoids are the most prevalent rock type in Archean terranes.
The area is characterized by Archean intrusive rocks as well as mafic and ultramafic rocks.
These arguments are very important concerning the conditions ruling in Archean.
At one time these rocks were regarded as Archean gneisses of a special type.
Archean Technologies has designed and developed its own range of VoIP system.
The first large cratonic landmasses formed during the Archean eon.
The majority of Archean rocks which still survive are metamorphic and igneous rocks.
A tectonic model that attempts to explain common features of Archean geology is investigated.
The multifunctional Archean shows how to combine natural materials with the benefits of today.
All these successive events probably occurred during the Archean ages.
The rate of carbon burial during the Archean was not significantly different from today.
Synvolcanic and synsedimentary base metal sulphide deposits are ubiquitous in the Archean rocks.
The archean genus Pyrococcus has proven a rich source of thermostable polymerases with proofreading activity.
Thus the different tectonic units have different late Archean tectonometamorphic histories.
Archean eon begins on the Earth.
Estimates for the age of the basement rock ranges from Archean to early Proterozoic.
Archean Eon is a bit fuzzy.
The underlying bedrock is composed of medium grained granite and sometimes Archean aged granitoids.
Komatiites are found in Archean to Proterozoic greenstone belts.
Lopoliths typically consist of large layered intrusions that range in age from Archean to Eocene.
The case against Archean subduction.
