Oldest Parts Of Ocean Floor
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They could be the oldest known organisms on planet earth.
Oldest parts of ocean floor. The mid atlantic ridge is a mid ocean ridge which is a system of underwater mountains formed by tectonic plate movements and is a catalyst for oceanic crust formation. Where are the oldest parts of rocks on the ocean floor. Energy poor environments is the most interesting part of the. This is because the oldest sea floor is subducted under other plates and replaces by new surfaces.
Deep ocean drilling and radiometric dating in the late 1960s gave an accurate stratigraphy and precise date of the ocean floor. The hadalpelagic zone lies between 19 686 feet to 36 100 feet. It then moves outwards towards the plate margins where it is subducted. These parts of the seafloor are about 200 million years old.
The youngest part of the sea floor is where it is being created at the mid ocean ridge. This continual motion is evidenced by the occurrence of earthquakes and volcanoes. From studying the oxygen isotopes of the shells of microfossils in these cores scientists were able to begin studying the earth s past climates in a study known as paleoclimatology. The hadalpelagic zone is also called the trenches and is found from the ocean basin and below.
The next oldest seafloor is found at the margins of the north atlantic ocean and the northwestern pacific ocean as far as possible from the mid ocean ridges where they were created. The oldest oceanic crust in the atlantic ocean is part of the mid atlantic ridge mar the longest mountain range in the world. The depth depends on the trenches and valleys in the area. The oldest of all oceanic rocks are.
Japan s marina trench is the deepest part of the ocean ever to be explored by man and it sits at 35 797 feet. The oldest rocks on the ocean floor would be those at the colliding edge of the plate boundary answer 2. The tectonic plates are constantly in motion and new surfaces are always being created. So the oldest sea floor is found at the plate margins.
Just as new sea floor forms at mid ocean ridges new sea floor is forced back into the mantle at abduction zones.
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Itext Chapter 1 Section 4
