'8 ga' presentation slideshows

745 views • 56 slides

711 views • 56 slides

Geologic Evidence for the Antiquity of Life

577 views • 44 slides

A chronostratigraphic division of the Precambrian: possibilities and challenges

654 views • 39 slides

Wouter Bleeker, Richard Ernst & Ken Buchan Geological Survey of Canada, Ottawa

Evidence for plate behaviour at 2.1-1.8 Ga: break-up, dispersal & suturing of Archean cratons. Wouter Bleeker, Richard Ernst & Ken Buchan Geological Survey of Canada, Ottawa.

534 views • 28 slides

Hadean to Archean Some Hell-on-Earth Norman H. Sleep

Hadean to Archean Some Hell-on-Earth Norman H. Sleep. Sequence of events. Moon-forming impact Prior status? Bad aftermath Earth starts hot Clement by start of Archean. Moon-forming impact. ~4.5 Ga Earth vapourized ~1 ka Internal hot and tidal greenhouse ~10 Ma

356 views • 23 slides

Ask significant questions about the Earth, its history and processes

TTGs We Have Known and Loved: 1.5 Ga of Growth and Recycling of Archean Continental Crust in the Northern Wyoming Craton (NWC).

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The Archean Eon

The Archean Eon. 3800 m.y. Subdivisions of the Archean - ERAS. 2.5 Ga. 2.8 Ga. 3.2 Ga. 3.6 Ga. 3.8 Ga. Origins of Life Basic minimum requirements for life: Membrane-enclosed capsule to contain bioactive chemicals Energy-capturing chemical reactions (to promote other reactions)

981 views • 11 slides

The Archean Eon

The Archean Eon. 3800 m.y. Subdivisions of the Archean - ERAS. 2.5 Ga. 2.8 Ga. 3.2 Ga. 3.6 Ga. 3.8 Ga. Origins of Life Basic minimum requirements for life: Membrane-enclosed capsule to contain bioactive chemicals Energy-capturing chemical reactions (to promote other reactions)

327 views • 11 slides