ERS103H5 Lecture Notes - Lecture 4: Zircon, Oxygen-17, Archaea
Document Summary
Slide 3, 6 from lecture 3powerpoint - important diagram. Detrital zircons - specific type of mineral which traps uranium within their structure, uranium led isotope system allows for radioactive dating which shows they are older than 4 billion years old. * we do(cid:374)"t ha(cid:448)e a(cid:374)y ro(cid:272)ks that date that are a(cid:272)tually that age, that"s (cid:449)hy it"s (cid:272)alled detrital. It comes from the erosion of a previous rock that is older than this rock that eventual trapped these layers of zircon into it. Formation of the moon - 4. 45 billion years ago when the collision of two planet like structures collided leaving one moon and one earth. 4. 45 billion years ago the moon would have been 22. 5km to earth as compared to the 402 300 km that now exists. Dealing with a young sun with only about 70-80% of the modern day energy source, this amount would leave for constant glaciations today.
