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Are slivers of oceanic crust and underlying mantle that may be emplaced on the continents at subduction zones?
Yes, these slivers of oceanic crust and underlying mantle are known as ophiolites. Ophiolites are sequences of rocks that represent ancient oceanic lithosphere that have been tectonically emplaced onto continental crust at subduction zones. They provide valuable insights into processes occurring at mid-ocean ridges and in ocean basins.
What is The Matterhorn made of?
To 3400 meters, Ophiolites and Sedimantary rocks, from 3400 meters to the top of Gneisses.
Where ophiolites are formed?
Ophiolites are typically formed at mid-ocean ridges, where tectonic plates are diverging and new oceanic crust is created through volcanic activity. They can also be found in subduction zone environments, where oceanic crust is thrust onto continental crust due to tectonic plate movements. This process can cause sections of the oceanic crust, including mantle material, to be emplaced onto land. Ophiolites serve as important geological records of the oceanic crust and mantle processes.
Why are ophiolites of special interest to geologists?
Ophiolites are of special interest to geologists because they provide a unique window into the processes at mid-ocean ridges and the oceanic lithosphere formation. They contain a complete sequence of oceanic crust and upper mantle rocks that are rarely preserved on the Earth's surface, allowing researchers to study the formation and evolution of oceanic lithosphere in a natural setting. Additionally, ophiolites can provide valuable insights into plate tectonics, mantle dynamics, and crustal accretion processes.
Why are ophiolites found on land even though they are formed underwater?
The oceans will dry up kind of like the way people get sea salt.
Did ophiollites form along subduction bounderies?
Ophiolites are created under mid-ocean ridges and represent a vertical section beneath a ridge system. One of the best ophiolites is seen in the Troodos range in Southern Cyprus. The topmost layer is invariably pillow lavas which are usually basaltic lavas that were erupted under water. Then as an ocean closes due to subduction, part of the ocean ridge system MAY be scrapped off and by a process called OBDUCTION be forced onto the plate which is over-riding which is usually the continental plate. If the processes cause the obducted mass to rise above sea level the result is an ophiolite. So whilst they are created at mid-ocean ridges they are the result of subduction.
What has the author Craig V Thomas written?
Craig V Thomas has written: 'Structure of the sheeted dike complex of the Kizildag ophiolite, southern Turkey, and implications for seafloor spreading processes' -- subject(s): Ophiolites, Geology
Where can you find ophiolite?
Ophiolites are primarily found in mountain belts, such as the Alps, Himalayas, and Andes, where tectonic forces have uplifted ancient oceanic crust. They can also be found in smaller occurrences in areas such as California and Cyprus.
What has the author Jeffrey Y Foley written?
Jeffrey Y Foley has written: 'Ophiolitic and other mafic-ultramafic metallogenic provinces in Alaska (west of the 141st meridian)' -- subject(s): Ophiolites, Ore deposits, Rocks, Ultrabasic, Ultrabasic Rocks
How does olivine form?
Ophiolites form when the ocean crust is young and buoyant. At this point, it is less dense than the continents and is pushed on the continental crust when tectonic action occurs. Ophiolites are a part of the oceanic crust and upper mantle that have been placed on a continent.
Why is the oceanic crust younger than cretaceous?
This is not true. There is quite some oceanic crust that is older than the Cretaceous still present and we even find small parts of very ancient oceanic crust on the continents as ophiolites. On average the oceanic crust might be of Cretaceous or even younger age because it is constantly recycled into the mantle in subduction zones and created on mid ocean ridges.
How long does the Marikina Fault extend?
It is in the Philippines, the countries main fault line. It runs from Sierra Madre to Tagaytay City. The Philippino fault system is a series of faults, most strips are long and narrow like the Zambales ophiolites which is at least 400 kms long
