Table of Contents
Where can ophiolite be found?
Ophiolites have been found in Cyprus, New Guinea, Newfoundland, California, and Oman. The Samail ophiolite in southeastern Oman has probably been studied in the greatest detail. The rocks probably formed in the Cretaceous not far from the what is now the Persian Gulf.
What causes an ophiolite?
An ophiolite is a section of Earth’s oceanic crust and the underlying upper mantle that has been uplifted and exposed above sea level and often emplaced onto continental crustal rocks.
What is ophiolite used for?
Ophiolites in orogenic (mountain building) belts represent sutures between two continental plates. Their recognition is therefore important in tectonic reconstructions.
What is ophiolite and where is it located in the Philippines?
Abstract. The Zambales Ophiolite Complex (ZOC) in the western portion of Luzon Island, Philippines represents a typical exposure of an emplaced crust-upper mantle section of an ancient lithosphere.
How deep is Dunite formed?
about 400 km
Dunite and other peridotite rocks are considered the major constituents of the Earth’s mantle above a depth of about 400 km (250 mi).
What are the main rocks in an ophiolite suite?
A sequence of rocks consisting of deep-sea marine sediments overlying (from top to bottom) pillow basalts, sheeted dikes, gabbro, dunite, and peridotite.
What type of rock is ophiolite?
Ophiolite is a stratified igneous rock complex composed of upper basalt member, middle gabbro member and lower peridotite member (Fig. 1). Some large complexes measure more than 10 km thick, 100 km wide and 500 km long. The term “ophiolite” means “snake stone” in Greek.
What is Obduction zone?
Obduction occurs where a fragment of continental crust is caught in a subduction zone with resulting overthrusting of oceanic mafic and ultramafic rocks from the mantle onto the continental crust.
What ophiolite means?
Ophiolite is thrust sheets of ancient oceanic crust and upper part of mantle rocks that have been uplifted and exposed above sea level and often emplaced on top of the continental lithosphere.
Where can Basalt be found in the Philippines?
Normal (N)-MORB-like basalts were found at DSDP Sites 290 and 447 near the Central Basin Fault to the SW of Site 1201D, and enriched (E)-MORB-like basalts were found at DSDP Site 291 in the southern West Philippine Basin. OIB-like basalts were found at DSDP Sites 292, 294 and 446 (Fig. 1).
How do Ophiolites form?
formation. … ultramafic rocks are known as ophiolites. Many geologists believe that ophiolites formed at oceanic ridges were emplaced by tectonic forces at convergent plate boundaries and then became exposed in highly deformed orogenic (mountain) belts.