I find psuedomorphs crystals to be very intriguing. Makes you wonder at the unique geochemical conditions necessary for these replacement minerals to precipitate. Quartz after anhydrite is definitely an odd-ball situation. Great specimen BTW.
On the discussion of the Parana -Etendeka FBs. The trope that LIPS correlate strongly with extinction eevents doesn't seem to hold for the P-E basalts. Some researchers have focused on the rapid eruption duration of approximately 1 MY as a possible clue. That leads to other questions such as possible related climate perturbations or ocean chemistry changes which I don't think has evidential support at this time. Maybe the duration of the eruptions just was too short of a time-frame to leave obvious evidence. Another interesting puzzle that is beyond my expertise.
Yes, clearly SOME rather extensive volcanic episodes do, and some do not correlate with significant extinction events. I don't think there is any particular significant extinction event associated with the Columbia Plateau Basalts, erupted mostly over a period of about 3 million years though over a relatively small area, as these things go. There's plenty that we (at least I) don't understand about such things. Thanks for your comment.
Yes, clearly SOME rather extensive volcanic episodes do, and some do not correlate with significant extinction events. I don't think there is any particular significant extinction event associated with the Columbia Plateau Basalts, erupted mostly over a period of about 3 million years though over a relatively small area, as these things go. There's plenty that we (at least I) don't understand about such things. Thanks for your comment.
When does the compilation/book come out?!
(Yep, I am so old I still think bound hard copy is cool.)
I like physical books too (around 3500 in my house) but I know what it takes to make one, so I wouldn't hold my breath :)
Congratulations on reaching the 100 mark!
One hundred, with hundreds more to come...
I find psuedomorphs crystals to be very intriguing. Makes you wonder at the unique geochemical conditions necessary for these replacement minerals to precipitate. Quartz after anhydrite is definitely an odd-ball situation. Great specimen BTW.
On the discussion of the Parana -Etendeka FBs. The trope that LIPS correlate strongly with extinction eevents doesn't seem to hold for the P-E basalts. Some researchers have focused on the rapid eruption duration of approximately 1 MY as a possible clue. That leads to other questions such as possible related climate perturbations or ocean chemistry changes which I don't think has evidential support at this time. Maybe the duration of the eruptions just was too short of a time-frame to leave obvious evidence. Another interesting puzzle that is beyond my expertise.
Yes, clearly SOME rather extensive volcanic episodes do, and some do not correlate with significant extinction events. I don't think there is any particular significant extinction event associated with the Columbia Plateau Basalts, erupted mostly over a period of about 3 million years though over a relatively small area, as these things go. There's plenty that we (at least I) don't understand about such things. Thanks for your comment.
Yes, clearly SOME rather extensive volcanic episodes do, and some do not correlate with significant extinction events. I don't think there is any particular significant extinction event associated with the Columbia Plateau Basalts, erupted mostly over a period of about 3 million years though over a relatively small area, as these things go. There's plenty that we (at least I) don't understand about such things. Thanks for your comment.
Great synopsis