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phd , We throw the Basaltic oceanic crust away,the continents are JOINED now, at the lowest level. Let's take that all away and suppose the tops are pushing together, Once all levels are together they must stop.
If magic could provide folding. both masses MUST BUCKLE! That's how physics works. In fact the smaller body will buckle more, because the BIGGER can distribute the force over a greater mass/area, Mini-car vs Semi.
phd , Now we have the real problems, Basalt folds of Basaltic Ocean crust. 2. lower level collisions preventing upper level collisions and 3 . innertia and Physics.
phd, MOST rifts (80%) ride up the middle of two pieces. We'll say India was 200 miles from Eurasia. One side rides UNDER the other side. Volcanic islands are DISPLACED UPWARD and as the subducting 100 miles disappear under the other HALF,...WHICH NOW Buckles UPWARD in massive basaltic Mountain ranges. We are assuming a MOTIVE POWER that DOESN'T exist to buckle 10 miles thick of hundreds of thousands of square miles of CLEAN UNLAYERED Basalt. Let's say all of this could be overcome.(more)
phd O-kay, first, continental edges ( at the continental shelf, going down to the oceanic plate) are ALWAYS tiered, like the edge of a wedding cake, as if two sides pulled apart, then held and did a SLOW pull, then a second rift,...SLOW.. then finally a more successful continuing pull-apart. So, if there WAS a collission, THE bottom tier would hit first. ....BUT,,, BEFORE THAT,... Ta-Daaa, The Oceanic plate. To come together, we NEED SUBDUCTION. I'm sure you agree. (more)
It's off by about 1000 KM... but for such a small cross section... I don't think it's that far off at all... I am just guessing it might need about 3cm radial growth per year over 180MY.
Guys (first note below) What else do I do? I MEASURE, I diagram, I count and trace the size of craters, continental edges, scour the BEST maps (Tharp's, BEST) I verify, I keep notes, underline, THINK, measure,cut out shapes in geometry and MEASURE VERY carefully. Something very few people in Geology seem to want to do.
What would happen - just for argument's sake - if 2 continental landmasses DID crash into each other. What would the effect be? What would we observe?
When I work, I collect files full of data and maps and books and stuff. We call it "WORK PRODUCT". When I'm done. I throw most out, or I would be buried in effluvia. If someone wants graphs charts and endless lists and calculations, Sam Carey has two books, and Maxlow one. I throw out the theories, I take the KNOWN FACTS and put THOSE TOGETHER. I don't re-do, re-discover, create theories. I search for the facts that REALLY SEEM to be FACTS, like the Crustal Age Map!
allow me to rephrase my query, I would like to see such a link myself sereeba, the more hard data we see the less ambiguous the supporting statements which, I assume, are based on the data at such a link.
xray - what would be convincing numbers? I think the correlation between the rate of the Ocean sea spreads when compared to a rate of expansion would do it... Correct? What would that calculation involve? The radial growth versus the circumference of the earth over time... and compared to the sea floor spread rates. Right? It's about 1700KM from the Mid Atlantic Ridge to Africa (Google Maps?) +280 MY of 2cm per year radial growth. Or... 6160KM Where do I Cosine? Do I Cosine?
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Let's take that all away and suppose the tops are pushing together, Once all levels are together they must stop.
If magic could provide folding. both masses MUST BUCKLE! That's how physics works. In fact the smaller body will buckle more, because the BIGGER can distribute the force over a greater mass/area, Mini-car vs Semi.
Volcanic islands are DISPLACED UPWARD and as the subducting 100 miles disappear under the other HALF,...WHICH NOW Buckles UPWARD in massive basaltic Mountain ranges. We are assuming a MOTIVE POWER that DOESN'T exist to buckle 10 miles thick of hundreds of thousands of square miles of CLEAN UNLAYERED Basalt.
Let's say all of this could be overcome.(more)
To come together, we NEED SUBDUCTION. I'm sure you agree. (more)
Long
20North - 46West - 18West = 28 Degrees or 0.07777
that's 3000KM over 180MY...
I get an expected spread of 1,758KM (2cm per year) to 1934 KM (2.2cm per year)
(40,075.16km / 3.14 / 2) - (24,872km 180Mya / 3.14 / 2)
It's off by about 1000 KM... but for such a small cross section... I don't think it's that far off at all... I am just guessing it might need about 3cm radial growth per year over 180MY.
What would happen - just for argument's sake - if 2 continental landmasses DID crash into each other. What would the effect be? What would we observe?
When I work, I collect files full of data and maps and books and stuff. We call it "WORK PRODUCT".
When I'm done. I throw most out, or I would be buried in effluvia. If someone wants graphs charts and endless lists and calculations, Sam Carey has two books, and Maxlow one.
I throw out the theories, I take the KNOWN FACTS and put THOSE TOGETHER.
I don't re-do, re-discover, create theories. I search for the facts that REALLY SEEM to be FACTS, like the Crustal Age Map!