2/21/2023 0 Comments Transform plates![]() At this point, magmas from the ridge intrude the transform, and the contact becomes an igneous contact.Ĭrossover point, where the transform juxtaposes oceanic lithosphere of the same age formed at the two different ridge segments. Note that the lateral motion between the two segments of the oceanic crust ceases once the opposite ridge segment is passed. The sense of motion on the transform is opposite the apparent offset. Three-dimensional view of a transform fault in the ocean basin, apparently offsetting a segment of the mid-ocean ridge. ^Transform^ Ridge Ridge G Infobase Publishing A component of dip-slip motion occurs all along the transform, except at one critical point, known as the The relative motion includes dip-slip (vertical) motions due to subsidence related to the cooling of the oceanic crust. Transform faults record a very complex history of motion between the two oceanic plates. Rock types along oceanic transforms typically include suites of serpentinite, gabbro, pillow lavas, lherzolites, harzburgites, amphibolite-tectonites, and even mafic granulites. They juxtapose rocks from very different crustal and even mantle horizons, show complex structures, exhibit intense alteration by high-temperature metamorphism, and have numerous igneous intrusions. Transform faults generate very complex geological relationships. The transform and ridge segments preserve an orthogonal relationship in almost all cases, because this geometry creates a least work configuration, creating the shortest length of ridge possible on the spherical Earth. There is typically some vertical motion along this segment of the fracture zone, since the two segments of the plate have different ages, and subside at different rates. After the ridge/transform intersection is passed, the fracture zone juxtaposes two segments of the same plate. Fracture zones are not extensions of the transform faults, and they are no longer considered plate boundaries. At this point, the transform fault is typically intruded by mid-ocean ridge magma, and the apparent extension of the transform, known as a fracture zone, juxtaposes two segments of the same plate that move together horizontally. The two plates then slide past each other along the transform fault between the two ridge segments, until the plate on one side of the transform meets the ridge on the other side of the transform. Magma upwells along the ridge segments, cools and crystallizes, becoming part of one of the diverging plates. Finally, we give you an opportunity to see if you can identify the location of a transform boundary where it cuts across part of New Zealand.īelow the video is a link to a short quiz with some assessment questions that can be used to measure learning after watching the video.Transform plate boundaries in the oceans include the system of ridge-ridge transform faults that are an integral part of the mid-ocean ridge system. We take a closer look at the major transform boundary in North America, the San Andreas fault system and examine what the plate boundary looks like in the Californian desert and what might happen if it were to slip like it has done in the historical past. ![]() We examine four examples of transform boundaries between plates and describe how and why short transform segments offset the oceanic ridge system throughout the world’s oceans. This video discusses the characteristics of transform plate boundaries where plates slide past each other. I can describe the physical features and geological processes at a transform plate boundary.I can identify examples of transform plate boundaries around the world. ![]()
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