'Archean' diaporamas de présentation

Archean Greenstone Belt

Archean Greenstone Belt. 1. Greenstone Belt Greenstone belts are generally elongate, Archean to Proterozoic terrains comprising intrusive and extrusive mafic to ultramafic igneous rocks , felsic volcanics , and inter-flow or cover sedimentary rocks .

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Archean Greenstone Belt

Archean Greenstone Belt. 1. Greenstone Belt Greenstone belts are generally elongate, Archean to Proterozoic terrains comprising intrusive and extrusive mafic to ultramafic igneous rocks , felsic volcanics , and inter-flow or cover sedimentary rocks .

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PLATE TECTONICS

PLATE TECTONICS. Last chapter in Davis and Reynolds. OUTLINE OF LECTURE. Earth engine Plumes Basic ingredients in plate tectonics Plate kinematics In 2-D On a sphere. Review of major questions. Earth layering The composition of the crust

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Multiple Equilibria in Atmospheric Oxygen: Archean , Proterozoic , Phanerozoic .

Multiple Equilibria in Atmospheric Oxygen: Archean , Proterozoic , Phanerozoic . Tom Laakso & Dan Schrag Goldschmidt Geochemistry June 13, 2014. Multiple Equilibria in p O 2. Kump 2008. Multiple Equilibria model: Proterozoic / Phanerozoic 3-box ocean/atmosphere model

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The Primordial Earth: Hadean and Archean Eons

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Precambrian Earth and Life History

Precambrian Earth and Life History. Precambrian Time Span. 88% of geologic time. The Precambrian lasted for more than 4 billion years!. Precambrian. The term Precambrian is informal but widely used, referring to both time and rocks The Precambrian: 4.6 bya to 542 mya

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Chapter 3. Archean Crustal Provinces - Petrological, Geochemical and Structural Characteristics

Chapter 3. Archean Crustal Provinces - Petrological, Geochemical and Structural Characteristics. Refs: K.C. Condie (ed.,1994). Archean crustal evolution. Elsevier, 420 pp. B. Windley (1995). The evolving continents. 3rd ed., Wiley, N.Y., 385 pp.

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Chapter 8

Chapter 8. Precambrian Earth and Life History The Archean. Introduction. Our reference of time, in geology, spans billions of years. The Earth is 4.6 billion years old The largest unit of time on Earth is the Precambrian . It lasted more than 4 billion years. Fig. 19.1, p. 494.

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Chapter 11: The Archean Eon of Precambrian Time

Chapter 11: The Archean Eon of Precambrian Time. 4.6 to 2.5 BYA. Observations red shift: expansion looking back in time stars & galaxies quasars cosmic background laws of physics. explanation: big bang formation of all matter from energy elemental composition: 75% H and 25% He age

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/Notes/

A Brief History of Earth. /Notes/. Image by: soumitra911. NASA, NOAO, ESA and The Hubble Heritage Team (STScI/AURA). NASA. /Hadean/. 4.6 to 3.8 billion years ago. /Hadean/ Surface. Began mostly molten. /Hadean/ Surface. 1 st crust formed after 100 million years.

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Origin of Life

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