Today @ 04:57 PM post located here
aniso:
Response to Aniso
There is no mainstream explanation for the origin of flood basalts? I had no idea.
Here are a few paras from an article that I've written relating to this topic:
By the end of the 1980s, several models had been proposed for the generation of these large scale magma flows. The most influential was the work of Robert White and Dan McKenzie (1989a, 1989b). They pointed out that, because temperature increases with depth, a relatively rapid thinning of the Earth’s crust will lead to large scale melting associated with decompression. Pressure release could convert large volumes of hot solid rock to mobile magmas that can find a way to the surface to emerge as a series of volcanic lava flows. This, combined with the Plate Tectonic concept of a super-heated mantle plume, provides a powerful explanation for the very large extrusions of magma involved in flood basalt deposits. It explains many different observations with one comprehensive model."
"Anderson et al (1992) tested the White and McKenzie model by looking closely at their eight listed continental flood basalts. For six cases, there was no significant evidence that the flood basalts were linked to mantle plumes, and in every case, there was no evidence of significant lithosphere thinning. These observations are major problems for their theory."
"Price (2001) wrote: “The mechanisms which are held to be responsible for the emplacement of these large basaltic provinces are contentious, and hotly debated.” He refers to three main views, including that of White and McKenzie. Price concludes that the lithosphere thinning model must be rejected, because it requires a degree of stretching and thinning that is completely unrealistic within the current framework of plate tectonics."
Are you saying that all Tertiary flood basalts were erupted during a short period in the last 4k years or so? What caused them to start up and shut down? Why is there no written record of them being deposited and what were the effects on human populations? Even the eruption of Laki, by itself, in 1783(?) caused some distress all over Europe and it was referred to by several historians.
I have not referred to 4K years ago - and I am not suggesting this.
Flood basalts are, in my thinking, linked to global catastrophism - although thay occurred as after-effects of the Mabbul. I hold to pressure release as a key mechanism, but one that is only effective in the context of global instability after the Flood.
There are no written record because they occured before the dispersal of humanity after the Flood.
I have visited the Laki eruption site and taken an interest in the after-effects of it. This is a tiny pimple of activity compared with what was going on during the eruption of flood basalts.
So just what is your explanation, then? You only say that they occurred 'many years after the flood' during recovery. That surely isn't much detail. I see from your publication that you think there was a catastrophe on Mull. What is you logical process to come to the conclusion that this was global in nature? Or is it just another uniformitarian event and not necessarily global?
I have not said it was global. But the Mull lavas are part of a much more extensive episode of volcanism that affected most of the North Atlantic. I've given more detail in my "Origins" article. I'm preparing a talk on the subject for November and maybe another article will emerge from that.
Can I point out that my posting was not to write an essay here on flood basalts, but to respond to grmorton's challenge. He implied that creationists have nothing to say. On the contrary, there are many things that we have already said! The challenge is not to creationists in general, but to a subset of creationists who hold that nearly all the fossils were laid down in the Flood. The rest of us have no problems with Flood basalts - they fit readily into the framework of interpretation that is being developed.