603-pp10 - UNIVERSITY OF SOUTH ALABAMA Last time we covered...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 MAS 603: Geological Oceanography MAS 603: Geological Oceanography Lecture 10: Ediacarins Lecture 10: Ediacarins UNIVERSITY OF SOUTH ALABAMA UNIVERSITY OF SOUTH ALABAMA Last time we covered Last time we covered Banded Iron Formations (Evolution of the Earth’s atmosphere and hydrosphere) 1) The Early Atmosphere 2) The Oceans and Hydrosphere 3) The Change Archean Oceans Discussion (Robbie) Oxygen The how is easy: Cyanobacteria (e.g., the microorganisms comprising stromatolites) and photosynthesis 6CO 2 + 6H 2 O C 6 H 12 O 6 (“sugar”) + 6O 2 Photosynthesis Oxygen Of particular interest are banded iron formations (BIFs) that are composed of alternating layers of hematite (Fe 2 O 3 ) and silica. BIFs BIFs http:/ www.ldeo.columbia.edu/edu/dees/U4735/lectures/03.html The first BIFs formed around 3.1 GA and peaked in abundance at 2.7-2.5 GA BIFs BIFs are thought to have been formed through oxygenation of sea water containing Fe 2+ (reduced iron). Fe 2+ Fe 3+ http://jersey.uoregon.edu/~mstrick/myimages/Banded%20Iron.gif Soluble Insoluble
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Oxygen in the Atmosphere Oxygen in the Atmosphere What about the atmosphere? Around the world, we
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 7

603-pp10 - UNIVERSITY OF SOUTH ALABAMA Last time we covered...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online