Seafloor Dating

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Dating of the Seafloor - United States Naval Academy
Circular Reasoning Dating Deep Seafloor Sediments . . .
How do we know the age of the seafloor? | Earth . . .
Mapping and Dating the Ocean Floor, the Least Known Part . . .
Seafloor Dating Within The Brunhes Period With Deep-Sea . . .
Theory and Evidence of Seafloor Spreading | Earth Eclipse
Dating of seafloor | Sisar Archivi | Archiviazione e . . .
Seafloor Spreading | National Geographic Society
Seafloor Mining - Woods Hole Oceanographic Institution
Paleomagnetism - YouTube
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Dating of the Seafloor . Methods to date the seafloor : Fossils--these give the age of the sediment layer enclosing them . The lowest fossils, just above the pillow basalts, will give the age of the crust . This requires drilling to the basalts . Depth--due to thermal subsidence, the depth will give a rough age for seafloor younger than 70-100 Ma .
Moreover, the different dating systems are calibrated to one another: dates assigned to the seafloor sediments are used to date the ice cores, and vice versa . In fact, the dating of the ice and seafloor sediment cores is a gigantic exercise in circular reasoning .
To confirm the ages obtained with magnetic records, and get an absolute age of the seafloor , scientists use the radioactive dating technique . When the lava solidifies at the ridges to form the new seafloor , radioactive elements coming from the mantle are trapped in it . These elements, like 238 U (Uranium) or 40 K (Potassium) are unstable, and . . .
Therefore, seafloor dating isn't that useful for studying plate motions beyond the Cretaceous . For that, geologists date and study continental crust . The lone outlier (the bright splash of purple that you see north of Africa) to all of this is the Mediterranean Sea .
Seafloor Dating Within The Brunhes Period With Deep-Sea Vector Magnetic Anomalies . Marine magnetic anomalies provide a robust record of the past geomagnetic reversal . Classical sea-surface magnetic anomaly studies are generally restricted to the analysis of polarity reversals, although a systematic secondary signal, made of shorter wavelength . . .
Harry Hess's hypothesis about seafloor spreading had collected several pieces of evidence to support the theory . This evidence was from the investigations of the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes . This evidence however was also used to support the Theory of Continental drift . 1 .
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Seafloor spreading is a geologic process in which tectonic plate s—large slabs of Earth's lithosphere —split apart from each other . Seafloor spreading and other tectonic activity processes are the result of mantle convection . Mantle convection is the slow, churn ing motion of Earth's mantle . Convection current s carry heat from the lower . . .
Seafloor Mining . Hot, buoyant, mineral-laden fluids rise from deep within ocean crust and mix with cold seawater . That triggers the precipitation of minerals that form deposits near and on the seafloor . Precipitating minerals also form seafloor "chimneys," and mineral particles in the fluids venting at the seafloor make the fluids look like smoke .
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Seafloor Dating

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