Chapter 19

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University of Louisiana, Lafayette *

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106

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Geology

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Oct 30, 2023

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1. Write down the timeline for Hadean, Archean and Proterozoic Eon. 2. Why it is difficult to study geologic record from earlier part of Precambrian? 3. What are the characteristics of Hadean? 4. The formation of Moon is an important event that believed to occur in Hadean. How did this event take place? 5. Today ’ s ozone layer in the atmosphere blocks most of the lethal ultraviolet (UV) radiation from the Sun. T hat’s how ozone layer protects the Earth. Do you think ozone layer presents in Hadean and Archean? Also, do you think the UV radiation plays important role in the origin of life? 6. During hadean, the process of continental accretion was slowly building the continents from __________. 7. The Canadian shield is one of the world ’ s largest continental shields. According to definition, the Canadian shield is a mass of _______ Precambrian rock. (Two option: exposed, buried) 8. Craton makes up of ________. 9. Greenstone belts account for only 10% of Archean rock. So, which type of rock dominates at that time? 10. Why greenstone rocks have greenish color? What type of rocks create the three units of greenstone? 11. Back-arc basin is important for the origin of _________. 12. Which important events occurred during Proterozoic? 13. What is Laurentia? Which geographic regions included in Laurentia? 14. The midcontinental rift formed at the beginning of 1.1 billion years and ceased after about only 20 million years. Did it break Laurentia? 15. What is supercontinent? Name the first known supercontinent. When did it form? When did it break? 16. Which type of rock assemblage was common in Proterozoic? Did they deposit on passive continental margin? 17. In Hadean eon, volcanic eruptions were very common. Which type of gases were most common in the atmosphere at that time due to outgassing from volcanoes? 18. Some pyrite (FeS 2 ) grains of conglomerate were not oxidized in some Archean rocks. What could be the region behind that?

19. Oxygen started to accumulate in the atmosphere from Proterozoic eon. Which two processes account for the introduction of free oxygen into the atmosphere? 20. How did Banded Iron Formations (BIF) form? When did they form? 21. Why stopping of BIF production is important? 22. Loss of greenhouse gases is likely responsible for glaciation events. Which is the oldest snowball earth events? 23. What could be the sources of water formation in Earth? 24. Which type of study is Abiogenesis? Why today ’ s atmosphere is not suitable to generate life? 25. How chemicals like CO 2 , water, N 2 , ammonia, methane could have converted into monomers (amino acids) in Early life ’ s atmosphere? 26. What is proteinoids? 27. Why hydrothermal vents are important in the study of origin of life? 28. All known Archean fossils represent Prokaryotic bacteria. What are the characteristics of Prokaryotes? 29. What are Stromatolites? 30. Which type of cells appeared in Proterozoic? What are its characteristics? 31. Does Prokaryotic cell contain nucleus? 32. Do all cells in multicellular animal perform same function? 33. Skeleton was rare in Ediacaran fauna. What type of assemblage makes Ediacaran fauna? 34. What are the Archean resources? 35. What are the Proterozoic resources?

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