Author Topic: Robert on Collaboration  (Read 168 times)

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Re: Robert on Collaboration
« on: May 23, 2017, 09:31:24 am »
5/16 8:08 PM
_Hi Mike. I found a catastrophist who's willing to collaborate, named Robert, though he's not yet impressed with Shock Dynamics. You're much more knowledgeable on geology than I am. Can you provide a good counter-argument to his statements on orogenesis that follow? He says they formed by vertical uplift, rather than by horizontal folding, but it seems to me that the uplift was surely due to the horizontal compression. Right? If so, what's the best proof/s? Thanks for any help.
_He said as follows:
_With orogenesis the book to read on the subject is The Origin of Mountains by Ollier and Pain https://www.amazon.co.uk/Origin-Mountains-Cliff-Ollier/dp/0415198909
_Mountains are not what people generally think- the authors make it clear that mountains have formed regardless of the underlying strata and/or bedrock. It is whole regions that have experienced rapid uplift then depending on how much erosion has occurred determines what we call the uplifted area- little erosion we call a plateau- substantial erosion we would call a mountain range. As the authors say ‘there are no fold mountains’. https://preachrr.files.wordpress.com/2010/07/foldedlayers.jpg
_So, from the above image the strata would have been deposited and folded on a pre-existing flat surface. Later the surface was uplifted and eroded leaving behind mountains. Ollier and Pain are certainly not catastrophists but they do realise that during a unique period in Earth history rapid uplift occurred (vertical not lateral movements) - then stopped, nothing like it happened before or has happened since.

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Wednesday, May 17, 2017 8:44 PM
_Re Orogeny
_Hi Lloyd,
_In the days before Plate Tectonics took over geology, the idea of stasis was pervasive.  There was just uplift and subsidence.  I am surprised that anyone still holds to that notion as a catastrophist; quite odd.  One of the few significant mountain ranges raised by simple uplift is the Transantarctic Mountains.  But as veteran orogeny specialist Peter Molnar wrote,
_"Virtually all major mountain ranges in the world are a consequence of crustal shortening."
Some Simple Physical Aspects of the Support, Structure, and Evolution of Mountain Belts. Peter Molnar, H. Lyon-Caen.  Special Paper 218, Geological Society of America, 1988, pp. 179-207.
_Ollier and Pain are rightly heralded by catastrophists for writing "Uplift occurred over a relatively short and distinct time.  Some earth process switched on and created mountains after a period with little or no significant uplift.  This is a deviation from uniformitarianism." (The Origin of Mountains. Cliff Ollier, Colin Pain. 2000. Routledge, London. p. 303.)
_Nevertheless, as old-school Australian geomorphologists they are sympathetic to the vertical tectonics they grew up with.
_Regarding the building of the Himalayas,  "Convergence between the Indian and Eurasian plates is estimated to be at least 1000-1400 km or as much as 2000-3000 km." (Li, Chang, Robert D. van der Hilst, Anne S. Meltzer, E. Robert Engdahl. 2008. Subduction of the Indian lithosphere beneath the Tibetan Plateau and Burma. Earth and Planetary Science Letters, Vol. 274, pp. 157-168.)
_In other words, the collision of India with Asia shortened the two landmasses by a total of 1000 to 3000 km, folding mountains and raising the Tibetan Plateau.
_An observation from a specialist in Appalachian mountain geology is old but unambiguous: "the evidence of intense shortening perpendicular to the length of the chain, not only in the folded marginal belts but also in the central core belt, is too clear for me to doubt that there was not only confining but directed pressure, the greatest compressive stress being consistently directed roughly horizontally across the orogenic belt." (Rodgers, John. 1970. The Tectonics of the Appalachians. John Wiley & Sons, Inc., New York. p. 224.)
_I could go on and on.  Someone who dismisses compressional orogeny and clings to vertical tectonics will no doubt be unimpressed by Shock Dynamics geology, but I suspect they are not operating with an open mind.