What is the average depth in sediment across the world?

Question

What is the average depth in sediment across the world?

Answer 1

Due to sea floor spreading, sediment on the ocean floor is less than that on the continents.

In the case of the Atlantic Ocean, the sediment varies in thickness. The thinnest sediment is near the Mid-Atlantic Ridge where new sea floor is currently being generated. That is to say, sediment thickness there is zero. The thickest sediment hugs the continental margins, which certainly have about 150 million years' worth of sediment.

Early (about 1860) measurements of maximum thickness of Earth's sediment ranged from 25,000 m to 112,000 m. With more recent mapping, thickness of fossiliferous rocks is at least 150,000 m.  However, there is a problem with these figures because the measurement did not take into account past erosion or differences in sedimentation rates It also did not consider that ancient sedimentary rocks are metamorphosed or melted.

Sedimentation rates average about 0.3 m/1000 years.

I know that this does not fully answer your question; however, it is the best that I can do.  Sorry!