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Muttrah’s ophiolite rocks: A source of wonder for geologists
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Until he visited Muttrah sea road did Sidhin, a Swiss traveller and a passionate geologist, know that the vast rocky mountains fervently looking at the Gulf of Oman have garnered global attention for its rare deposits of ophiolite which have been earmarked by the Ministry of Tourism for its natural history.
Geologists define an ophiolite as a section of the 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.
It contains minerals like chrome and copper, ores, which have been mined in Oman for thousands of years. A Magma is generally a mixture of molten or semi-molten rock, volatiles and solids that is found beneath the surface of the earth, and is usually seen to be present on other terrestrial planets and some natural satellites.
Oman ophiolite suggests subduction started with a shove
by Mary Caperton Morton Friday, December 21, 2018
Past research has suggested two mechanisms by which subduction zones may form along an area of lithospheric weakness: spontaneous sinking of denser crust and lithosphere, and forced convergence driven by lateral movement of a plate. A new study suggests that the latter was responsible for the formation of a fossil subduction zone off the Arabian Peninsula beginning about 104 million years ago. Credit: K. Cantner, AGI.
Plate tectonics is a fundamental control on how Earth operates and is important for the planet’s habitability, but how this crustal recycling process got started has long been a mystery. A new study examining some uniquely coupled metamorphic and volcanic rocks in Oman is adding some needed clarity about the initiation of subduction zones, a critical component in plate tectonics.