Much more sediment is deposited than removed by subduction (Talk.Origins)

Claim CD220.1:


 * About twenty-five billion tons of sediment are deposited in the ocean each year, but plate tectonic subduction only removes about one billion tons per year. Currently, ocean sediment thickness averages 400 meters. At the observed deposition rate, it would accumulate in only twelve million years, not the hundreds of millions of years that the oceans have been around.

Source: Humphreys, D. Russell, 1999. Evidence for a young world.

CreationWiki response: First of all the wording of the above claim is not an accurate representation of Russell Humphreys's article, in fact the last phrase, "not the hundreds of millions of years that the oceans have been around." was clearly not written by a Young Earth Creationist. It states the 100's of millions of years as fact, but a Young Earth Creationist would say something like alleged 100's of millions of years as Humphreys actually does. By the way Humphreys cites the age of the oceans alleged by evolutionist at 3 billion years not 100's of millions of years

The reference to subduction is a response to a claim by an evolutionist that subduction did remove it. So at this point Humphreys is simply dealing with the only mechanism the evolutionist had given him at the time.

Fine - but what is the average rate per year at which these processes occurs? Without an estimate of the average rate per year at which they occur, there is no way to estimate their net effect.

According to Uniformitarian theory, over the last 12 million years this effect would account for at most 1% of the total. This stretches it only to 12.12 million years. In other words this effect is insignificant to the problem.
 * Reference:Continental Drift

The simple fact is that for the oceans to be 3 billion years old the average accumulation of mud would have to be only 96 million tons per year. This means that the methods of removal suggested in point number 1 would have to remove on average 23.9 billion tons of mud per year.

Muito mais sedimento é depositado do que removido por subducção (Talk.Origins)