Dating sediment layers

18 Jul

The fact that most of the Earth is covered in water has spurred much interest in the world's oceans.For many years, scientists have studied the ocean's creatures, the effects of introducing chemicals to the water, and the geologic floor of the world's vast oceans.Hydrogenous sediment is created by chemical reactions in seawater to form minerals that accumulate as sediment.Sediment created by objects from space, such as meteors, is called cosmogenous sediment (Duxbury et al. The distribution of sediment is uneven because sediment derived from the continents stays mostly on the continental shelf, which is the area of shallower water around the continents and which is never subducted.If this catastrophic event was the cause, one would expect the ocean bottom to be covered in a single kind of sediment.However, the type of sediment on the ocean floor varies considerably and matches a uniformitarian model. (2005), seafloor sediments can come from one of four places: preexisting rocks, marine organisms, seawater, or space.Humphrey's strawman ocean floor does not prove the Earth is young.Humphreys states that "An alternative (creationist) explanation [for the amount of sediment on the ocean floor] is that erosion from the waters of the Genesis flood running off the continents deposited the present amount of sediment within a short time about 5,000 years ago" (Humphreys 2005).

Humphrey's argument focuses on subduction at convergent plate boundaries.The belt of siliceous sediments round the Antarctic consists of diatom ooze, whereas that in the equatorial Pacific is of radiolarian ooze." In places where diatoms and radiolarians are abundant in the ocean today, the sediment underneath them is composed of their skeletons, even to a great thickness.This is not consistent with a global flood model because such an event would have caused the seabed's sediments to be intermixed.Plates that move apart from each other form divergent boundaries, while plates that move towards one another form convergent boundaries.Convergent boundaries cause lithospheric subduction, the destruction of the sea floor, which is a key aspect of the supposed clock used to date the earth by measuring the depth of mud on the ocean floor.