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Major physiographic elements of the Philippine Mobile Belt Puerto Princesa Subterranean River National Park marker describing the geologic history of the Philippines. In the geology of the Philippines, the Philippine Mobile Belt is a complex portion of the tectonic boundary between the Eurasian plate and the Philippine Sea plate, comprising most of the country of the Philippines.
This reflects the sequence of accretionary wedge formation along the western side of the Philippine Mobile Belt. The youngest western ophiolitic zone was formed in the Sundaland – Philippine Mobile Belt boundary, while the older eastern ophiolite was formed in the proto-Philippine Plate and is the basal rock of the Philippine Mobile Belt. [31 ...
Ordovician ophiolite in Gros Morne National Park, Newfoundland Chromitic serpentinite, Bay of Islands Ophiolite, Lewis Hills, Newfoundland. An ophiolite is a section of Earth's oceanic crust and the underlying upper mantle that has been uplifted and exposed, and often emplaced onto continental crustal rocks.
Ophiolites are sequences of mafic to ultramafic rock generally believed to represent ancient oceanic lithosphere.They are distributed all across the world being all of them located at present or past orogenic belts, sites of mountain building processes.
The Philippine Mobile Belt is composed of a large number of accretionary blocks and terranes. These terranes are long and narrow like the Zambales ophiolites which is at least 400 km long and 50 km wide. The strips generally run north–south and the zones of convergence are usually demarcated by fault lines.
Geologic map depicting the Smartville Complex (in brown) and other accreted terranes in California. [1]The Smartville Block, also called the Smartville Ophiolite, Smartville Complex, or Smartville Intrusive Complex, is a geologic terrane formed in the ocean from a volcanic island arc that was accreted onto the North American Plate during the late Jurassic (~160–150 million years ago).
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An orogenic belt, orogen, or mobile belt, [a] is a zone of Earth's crust affected by orogeny. [2] An orogenic belt develops when a continental plate crumples and is uplifted to form one or more mountain ranges ; this involves a series of geological processes collectively called orogenesis .