'Greenstone belts' diaporamas de présentation

Chapter 9

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Chapter 8

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Chapter 8

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Chapter 8

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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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Chapter 8

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Today Pre Cambrian Geology DUE: Coastal Geology Project Monday Paleozoic Tectonics

Today Pre Cambrian Geology DUE: Coastal Geology Project Monday Paleozoic Tectonics LAB Geology of North America DUE: Choice of Fossil for Fossil Poster Next Wednesday Paleozoic Climate & Life Mesozoic Tectonics. Outline of Pre-Cambrian Time. Age & Origin of Earth

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Precambrian History

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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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Archean Rocks

Archean Rocks. Best, Chapter 15A. Archean Terranes. >2.5 Gy old Younger supracrustal sequences Greenstone belts Calc-alkaline metavolcanic rocks Older gneiss complexes Quartzo-feldspathic rocks Tonalites and migmatites intruded by granites. West Greenland.

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Week 2: When the Earth was young (Archean eon)

Week 2: When the Earth was young (Archean eon). EPSC 233-001 Fall 2002. Oceanic and continental crusts have different proportions of the main elements. continental (felsic) crust: more Al, Si, less Mg, Fe average density = 2.7 g/cm 3 oceanic (mafic) crust: less Al, Si, more Mg, Fe

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