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GEOLOGY 111 - Describe two ways in which volcanic gases

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Subject: Geology
Due on: 11/03/2017
Posted On: 11/03/2017 01:20 PM

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The documentary to include a discussion of possible causes of the Cretaceous-Paleogene, K-Pg, (or Cretaceous-Tertiary, K-T, in older literature) mass extinction.


1). Describe two ways in which volcanic gases from large flood basalt eruptions can impact global climate. Explain why these effects do not counteract each other (i.e., consider the timescale of the effect associated with each gas). (4 pts.)


2). What is another way, in addition to altering the climate, that volcanic gases could contribute to mass extinction events? (2 pts.)


3). Describe the effects of large impact events and the role of these in mass extinction events. (3 pts.)


4). What are the main problems (at least 2 or 3) with an impact origin for the Permian-Triassic mass extinction event? (2 pts.)


5). How does the chronology (i.e., timing and duration) of the Permian-Triassic mass extinction event, as inferred by Paul Wignall and colleagues based on their work in Greenland, compare with the chronology of the event as inferred by Michael Rampino and colleagues based on their work in the Alps? (3 pts.)


6). Briefly describe the carbon isotope anomaly associated with the Permian-Triassic mass extinction event, including its timing in relation to the various identified stags of the extinction event. (2 pts.)


7). What is the current interpretation of the cause of the carbon isotope anomaly that you identified in the previous question, and how would this contribute to the mass extinction event? (2 pts.)


8). From the reading, briefly describe the main evidence linking flood basalt eruptions and giant impacts to the

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