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Peter B
2010-Jun-24, 11:35 AM
G'day everyone

For the purposes of a short story I'm writing, can anyone point me to some articles about the Deccan Traps. I'm particularly curious to get a sense of whether the extent of the eruptions which created them would have been sufficient to darken the skies, and for how long.

As a comparison, what effects would the Chicxulub impact have had in terms of dimming sunlight?

BigDon
2010-Jun-24, 03:40 PM
I can't recall where I read it but when the Deccan Traps were laid it put the equavalent amount of dust into the air as the mount St Helens explosion, weekly, for several hundred years continously. As been said before, the Earth has seen worse than us.

jlhredshift
2010-Jun-24, 03:55 PM
G'day everyone

For the purposes of a short story I'm writing, can anyone point me to some articles about the Deccan Traps. I'm particularly curious to get a sense of whether the extent of the eruptions which created them would have been sufficient to darken the skies, and for how long.

As a comparison, what effects would the Chicxulub impact have had in terms of dimming sunlight?

Generation of Deccan Trap magmas (http://www.ias.ac.in/jess/dec2001/Esb32.pdf); Gautam Sen; Department of Earth Sciences and Florida Center for Analytical Electron Microscopy, Florida
International University, University Park, Miami, FL 33199.

BigDon
2010-Jun-24, 04:25 PM
Awesome article Mr. Redshift.

Trakar
2010-Jun-25, 05:18 PM
I can't recall where I read it but when the Deccan Traps were laid it put the equavalent amount of dust into the air as the mount St Helens explosion, weekly, for several hundred years continously. As been said before, the Earth has seen worse than us.

Have you any support and/or reference for these assertions?

jlhredshift
2010-Jun-25, 05:38 PM
Have you any support and/or reference for these assertions?

Hmmm, Would you mind stating specifically what your objection might be to either one of BigDon's statements?

mugaliens
2010-Jun-27, 07:00 AM
Hmmm, Would you mind stating specifically what your objection might be to either one of BigDon's statements?

I concur. BD's statements fit very well with that (http://en.wikipedia.org/wiki/Meteor_impact#Geology_of_Earth-impact_events)reported by astrogeologists.

Peter B, here's one article (http://www.sciencemag.org/cgi/content/abstract/327/5970/1214)which may help your short story.

distraction tactics
2010-Jun-29, 04:12 AM
As a comparison, what effects would the Chicxulub impact have had in terms of dimming sunlight?

Here's a short paper that tried tackling that very question: http://sonomae.files.wordpress.com/2010/06/pope-2002.pdf

jlhredshift
2010-Jun-29, 12:09 PM
Here's a short paper that tried tackling that very question: http://sonomae.files.wordpress.com/2010/06/pope-2002.pdf

From the cited paper; Pope, K. O.:


There are, of course, impact hazards other than dust clouds. For the
K-T event, the shutdown of photosynthesis and global cooling are more
likely to have been caused by the impact production of sulfate aerosols
from the target rock (e.g., Pope et al., 1997), and by soot from global
wildfires (e.g., Wolbach et al., 1990).

There is a location on the southern end of the Deccan Traps wherein the K/T layer is between two basaltic (thoelitic) flows. What we do not know is the global distribution of smoke at the time of impact to indicate how bad things were before they got worse. It may not have been anything unusual do to the non explosive nature of the fissure eruptions, on the other hand, fine smoke may have shrouded the jet stream path built up from the Deccan flows. Well, it was still a "bad day at flat rock".