tag:blogger.com,1999:blog-5859094080858570248.post5890027382528099736..comments2024-03-29T13:05:30.522+05:30Comments on Rapid Uplift: Allocyclicity vs Autocyclicity: An Old Debate RevisitedSuvrat Kherhttp://www.blogger.com/profile/18281172632784780810noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-5859094080858570248.post-26445908426715586272009-01-03T21:42:00.000+05:302009-01-03T21:42:00.000+05:30Suvrat says: "What if long term climatic cycles co...Suvrat says: "What if long term climatic cycles control the supply of sediment to the delta and influence avulsion frequencies?"<BR/><BR/>Good point ... since external controls will always 'influence' autogenic processes, it comes down to deciding when they influence is minor. I guess in the case of the avulsing lobe, the sed supply surely influences the occurrence of avulsion, but can sed supply (e.g., volume of sed delivered per unit time) be used to predict the timing of the avulsion? <BR/><BR/>It's all so complex! Since it's difficult to tease these apart, I really think it's about figuring out how they interact ... which is exactly what your example is about. In what way do the autogenic processes change when the external regime is different. Fun stuff.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-1599167135699245402009-01-03T10:44:00.000+05:302009-01-03T10:44:00.000+05:30Brian-i looked up some recent theoretical work on ...Brian-<BR/><BR/>i looked up some <A HREF="http://jsedres.geoscienceworld.org/cgi/content/abstract/76/7/962" REL="nofollow">recent theoretical work</A> on carbonate parasequences and people are still having problems clearly discriminating between the two cycle modes. so plenty of work to be done yet. <BR/><BR/>regarding the example you gave on delta lobe avulsion. What if long term climatic cycles control the supply of sediment to the delta and influence avulsion frequencies? Would that be an allocyclic mode?<BR/><BR/>Just trying to make things more difficult for you clastic types :-)<BR/>You're right. Scale matters. <BR/><BR/>I too worked in a very small lab and had quite a lot of freedom in expanding my thinking in many directions. so i really don't know what it is to work with 10-15 other graduate colleagues in the same lab.Suvrat Kherhttps://www.blogger.com/profile/18281172632784780810noreply@blogger.comtag:blogger.com,1999:blog-5859094080858570248.post-87403343493385815092009-01-02T22:44:00.000+05:302009-01-02T22:44:00.000+05:30Suvrat ... great post, that's a cool review from t...Suvrat ... great post, that's a cool review from the carbonate perspective.<BR/><BR/>The dynamic interaction of allo and auto controls really makes me think it could be difficult to impossible to unravel the relative contributions of either in many cases. For example, the classic example of an autogenic process in clastic systems in the avulsion of a delta lobe. But, if that delta was feeding a deep-water system and now that deep-water system is abandoned (because delta lobe avulsed) wouldn't that be an "external" change from the perspective of the deep-water environment? The complex causal chain combined w/ different spatial and temporal scales make the discrimination quite difficult.<BR/><BR/>Regarding your last paragraph ... I did my master's work in a group strongly influenced by one person, and did my Ph.D. in a larger group that wasn't dominated by anyone person or point-of-view ... for me, I like the latter better, but I wonder how different things would be for me if the two styles were in different order.Anonymousnoreply@blogger.com