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These three plates were joined at a migrating, or unstable, ridge-ridge-ridge (RRR) triple junction from which the Pacific plate began to grow 190 million years ago in an area east of the Mariana Trench; this area, known as the Pacific Triangle, is the oldest part of the Pacific plate and therefore the oldest ocean floor of the Pacific ...
Spreading rate is the rate at which an ocean basin widens due to seafloor spreading. (The rate at which new oceanic lithosphere is added to each tectonic plate on either side of a mid-ocean ridge is the spreading half-rate and is equal to half of the spreading rate). Spreading rates determine if the ridge is fast, intermediate, or slow.
To the west of this overlap, the GSC is divided into a further six segments. The easternmost three segments are characterised by multiple alternating low-relief valleys and ridges. The westernmost segments all have an axial valley within a single ridge. [3] The ~95 km long Galápagos Transform links the two main sections of the GSC.
In the southern Pacific, seafloor spreading continued from the Late Cretaceous across the Pacific–Antarctic, Pacific-Farallon and Farallon–Antarctic mid ocean ridges. [14] The Izanagi-Pacific spreading ridge lay nearly parallel to the East Asian subduction zone and between 60–50 Ma the spreading ridge began to be subducted. By c. 50 Ma ...
An oceanic core complex, or megamullion, is a seabed geologic feature that forms a long ridge perpendicular to a mid-ocean ridge. It contains smooth domes that are lined with transverse ridges like a corrugated roof. They can vary in size from 10 to 150 km in length, 5 to 15 km in width, and 500 to 1500 m in height.
San Pedro High School discovered a deposit of marine fossils on campus in 2022 and began collaborating with local paleontologists to uncover secrets from the Palos Verdes Peninsula's geological past.
Magnetic stripes are the result of reversals of the Earth's field and seafloor spreading. New oceanic crust is magnetized as it forms and then it moves away from the ridge in both directions. The models show a ridge (a) about 5 million years ago (b) about 2 million years ago and (c) in the present. [1]
Anytime you find a fossil, park paleontologists recommend you photograph it, note the coordinates and tell a ranger so a paleontologist can examine the specimen. ... This is one of the most ...