@krissmith777: Different Young Earth Creationists (like Kent Hovind) say 30 …

Comment on Panda’s Thumb: ‘SDAs are split over evolution’ by Sean Pitman.

@krissmith777:

Different Young Earth Creationists (like Kent Hovind) say 30 million years, and you say 15 million years. I don’t know which figure to trust.

Do the math yourself. It’s relatively simple:

We know how much sediment is being deposited in the oceans on a yearly basis (~30 billion metric tons). We know how much sediment is being removed from the oceans by subduction (~2 billion tons). This leaves ~28 billion tons to increase on the ocean floor every year.

Right off the bat this presents a problem. After all, at the rate of 28 billion tons per year (~13 km^3 of sediment) all of the ocean basins (total volume of ~1550 million km^3) could be completely filled with sediment in just under 120 million years – completely filled!

So, how much sediment is on the ocean floor right now?

The average sediment thickness over the entire ocean (shallow and deep) is about 1.7 kilometers according to the following reference:

http://www3.ncc.edu/faculty/bio/fanellis/biosci119/SEDIMENTS.htm

Given this reference, one can calculate the volume of ocean sediments simply by multiplying the average thickness (~1.7 kilometers) by the area of the world ocean (335 million square kilometers). The calculation shows that ~570 million cubic kilometers of sediment are present on the ocean floor. Next, we can estimate the mass of ocean sediments by multiplying the volume of sediments (~570 million cubic kilometers) by the average sediment density (~2.2 billion tons/cubic kilometer) for a total mass of ocean sediments of ~1e18 tons.

Given information on how much sediment is currently on the ocean floor (~1e18 tons), how much time would it have taken to deposit the current ocean sediments? If we have 28 billion tons per year building up without removal from the oceans (only ~2 tons of the 30 deposited are removed per year), we just take 1e18 / 28e9 = ~35 million years (in line with Hovind’s estimate)

Now, my original estimate of ~15 million years to produce the current sediment load in the oceans is based on Khain et al (1971) who calculated a total ocean sediment load of 277 million cubic kilometers (~48% of the generous sediment load assumed by Hovind and others). This sediment load within the oceans could be explained in just 17 million years at current deposition rates. Note also that the average thickness of ocean sediment listed above at 1.7 kilometers is an unconsolidated thickness. Consolidation to rock (assumed by the rest of the calculation) would cut the average thickness, and therefore time to formation, in half (consistent with my original estimate quoted for you earlier in this thread of ~15 million years).

If the current sediment load can be explain by ~15 million years of sediment deposition, what does that say about the mainstream argument that Pangea split up some 200 million years ago? – not to mention all the time since oceans supposedly first formed and continental drift started taking place (some 4 billion years plus years ago according to mainstream thinking).

Now, the question I think you’re addressing, i.e., How long would it take to deliver the present continents to the ocean if the present rate of erosion continues? – is a different question.

There are about 130 million km^3 of continental crust above sea level. As noted above, about 13.6 km^3 of solid material are carried by all the rivers of the Earth into the oceans every year (~31 billion metric tons/year). Dividing 130 million km^3 by 13.6 km^3 = ~9.5 million years to erode all the land that is currently above sea level.

This has been well-known for some time. Back in 1971 Dott and Batten noted:

“North America is being denuded at a rate that could level it in a mere 10 million years, or, to put it another way, at the same rate, ten North Americas could have been eroded since middle Cretaceous time 100 m.y. ago.”

Dott, R. H. and R. L. Batten. 1971. Evolution of the earth. McGraw-Hill, New York.

As far as I’m aware, this problem has yet to be adequately explained and is rarely addressed by mainstream scientists…

–Besides, you seem to not understand that Plate Tectonics has been going on since the first continents even formed, and these processes have a hand in dismantling parts of the sea floor and creating new sea floor. The sea floor from, for example, the Cambrian period is NO LONGER on the sea floor, and as a result, we have no sea floor that is 445 million years old because plate tectonics ran it’s course.

Again, as already noted, we do have sea floor that is supposed to be over 200 million years old by mainstream estimates. That’s simply not reasonable given known ocean sedimentation rates…

Sean Pitman
www.DetectingDesign.com

Sean Pitman Also Commented

Panda’s Thumb: ‘SDAs are split over evolution’
@Phil Mills:

One of these frequent posters claims to be a Young Earth Creationists, but believes in creation based on what he refers to as “faith.” One could get the idea that he fears that anything scientifically shown to support creation is actually bad since it would then somehow require less faith to believe. His faith, however, is more akin to the Catholic student who is reported to have said, “Faith is what you believe that you know ain’t so.”

This is not Biblical faith. Neither is it the faith of the Adventist pioneers. It certainly doesn’t build faith, it actually destroys genuine faith. This pseudofaith more closely resembles a mere superstitious belief. It is no surprise that agnostics, evolutionists, and other doubters have such an affinity for those who possess this kind of “faith” on this site. Why wouldn’t they agree with it. It doesn’t threaten them in any way. It bolsters their ranks. It confirms their unbelief since they already believe faith is unreasonable.

I couldn’t have said it better myself…

Sean Pitman
www.DetectingDesign.com


Panda’s Thumb: ‘SDAs are split over evolution’
@Professor Kent:

Of course it’s a good thing; I never said it was bad. The problem is when you and Pitman maintain that empirical evidence from nature is essential to validate the Bible–and that is heresy and blasphemy.

You yourself made this “blasphemous” claim when you listed off several empirical evidences, like fulfilled prophecy (based on empirical investigation of real history), as reasons why you believe the Bible to be superior to other books claiming to be the true Word of God.

Here is what you wrote:

In short, there is ample evidence to support the Bible and Christianity, including fulfilled prophecy, the lives and testimony of the apostles, archeology, the impact of the Bible on personal lives, and so forth. All of this is “empirical evidence” that goes beyond what is needed to establish the validity of scripture. The other religions are confronted with serious shortcomings on these issues, in my opinion… – Professor Kent

Now, if the Holy Spirit is enough, as the Latter-day Saints believe, to lead you into all truth without having to use your brain, why did you appeal to these empirical evidences to support your belief or faith in the superior credibility of the Bible vs. other competing options held in higher regard by other faiths? Why didn’t you just appeal to the voice of the Holy Spirit speaking directly to you as evidence enough?

So, the argument here isn’t really over the need for an empirical basis for one’s faith in the Bible before it can be considered rational. You yourself appeal to such. You admit to the need for an empirical argument as the basis for choosing the Bible over other competing options. You’ve made this argument several times now. Therefore, the real argument here is in regard to your notion that the empirical basis, or “weight of empirical evidence” for faith never changes or needs to be re-examined in any way over time – despite the discovery of new evidence and information?

Sean Pitman
www.DetectingDesign.com


Panda’s Thumb: ‘SDAs are split over evolution’
@krissmith777:

You missed my overall point. The first sentence I quoted from it was: The rates at which sediments accumulate vary enormously, owing to the natural variability of the processes that produce and transport sediments. — The rates vary greatly depending on the conditions… Your argument pre-supposes that the rate has not changed, and you have not demonstrated that it has. — And frankly, it doesn’t have to be.

You misunderstand the “rate” that the author is talking about here. This rate is not the overall rate of ocean sedimentation which is in fact fairly constant at ~30 billion tons per year. I’ve already tried to explain this to you, but the variability your reference is talking about is the local variability that is indeed due to many factors of sediment transport within the oceans themselves. This local variability does not affect the overall sediment load that is consistently delivered to the oceans.

— David E. Thomas says it much better than I ever could:

…much sediment never gets to the ocean floor, but is trapped instead on continental slopes and shelves, or in huge river deltas. Over the years, some of these continental slopes can accumulate several kilometers of sediment, while others can even become part of mountain ranges in continental plate-to-plate collisions. Neither erosion nor subduction are expected to be constant processes over millions of years, and they are simply not good clocks.

Indeed, and my calculations take into account all the sediment currently in the oceans, to include the sediment on continental slopes and shelves and river deltas. The total amount of sediment, taking all of these factors into account, is only 10^17 tons. That tonnage can be explained in just 15 million years. That’s a huge problem for mainstream theories of plate tectonics and the proposed age of ocean basins. Your arguments about the variability of sedimentation for different parts of the ocean floor are completely irrelevant to explaining the total tonnage that is currently in the oceans regardless of its location.

I heard one geologist call it a “crude” dating method. Looks more related to “relative dating,” not “absolute dating.”

Again, you’re looking at local rates of accumulation over time, not the overall rate of accumulation over time. You’re confusing two separate concepts here. They aren’t the same thing.

Again, that is completely irrelevant to the point that the total amount of sediment, the total tonnage that is current in the oceans, irrespective of its location within the ocean basins, can be explained given just 15 million years… – Sean Pitman

And the paper I linked a while ago using the current rate gave the figure of 100 million years: (“At a rate of 0.5 cm (.2 in)/1000 years, it takes only 100 million years to accumulate 500 m (1600 ft) of sediment,”)

Indeed – the local rate of sediment accumulation on some areas of the ocean floor may indeed be this slow. Again, however, this is completely irrelevant to the fact that the total sediment contained by all the oceans in the whole world, to include the sediment that is on or close to the continent shelves, is far far too low for them to be nearly as old as mainstream scientists propose…

Sean Pitman
www.DetectingDesign.com


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