Scientists date sea-floor rocks by looking at patterns in the rocks, including magnetic patterns, and by looking at the geomagnetic reversal time scale.
looking at patterns
The age of rocks gets progressively younger as you move away from the mid-ocean ridges, where seafloor spreading occurs. This supports the theory of seafloor spreading, as new crust is being formed at the ridges and then moves away from them over time. This process leaves a record of older rocks further from the ridges and younger rocks closer to them.
A scientist who studies rocks and geologic processes in ocean basins is a marine geologist. They investigate the formation and evolution of the ocean floor, as well as the geological features and processes that shape ocean basins. Their research contributes to our understanding of plate tectonics, seafloor spreading, and marine geology.
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The ages of the rocks become older the farther the way they are from the ridges. The closer they are the younger it is. This leaves evidence to the seafloor spreading theory.
They tell us about past environments and may be used to date rocks on a relative time scale.
The ages of the rocks become older the farther the way they are from the ridges. The closer they are the younger it is. This leaves evidence to the seafloor spreading theory.
The rocks on the seafloor are generally less than 200 million years old due to the process of seafloor spreading and subduction, which recycles old rocks. In contrast, some rocks on the continents can be over 4 billion years old, dating back to the formation of Earth's crust. This difference in age is attributed to the dynamic nature of plate tectonics.
The youngest seafloor rocks are typically found along mid-ocean ridges, where tectonic plates are moving apart and new crust is continually forming. This process, known as seafloor spreading, leads to the creation of young rocks that are progressively older as you move away from the ridge axis on either side.
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Rocks near continents are typically older and more varied in composition, while rocks near centers of seafloor spreading are younger and primarily composed of basalt. Continental rocks may have undergone more geological processes, leading to greater diversity in mineral content and structure, whereas seafloor rocks are usually basaltic due to the solidification of magma from undersea volcanic activity.