Presentation On Ophiolites

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hafizshahidhussain

PRESENTATION ON OPHIOLITES ,[object Object],[object Object]

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History of term Ophiolite ,[object Object],[object Object],[object Object]

Formation of Ophiolites ,[object Object]

Lithology of Ophiolites ,[object Object],[object Object]

Types of ophiolites ,[object Object],[object Object]

Difference between Oceanic crust and Ophiolites ,[object Object],[object Object],[object Object],[object Object]

Ophiolites in pakistan ,[object Object],[object Object],[object Object]

Eurasian block ophiolites ,[object Object],[object Object],[object Object],[object Object]

Afghan block ophiolites ,[object Object],[object Object],[object Object],[object Object],[object Object]

conclusion ,[object Object],[object Object],[object Object],[object Object]

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Komattite Named after the Komati River in South Africa. first described by Morris and Richard (twins) for ultramafic units in the Barberton Greenstone belt of South Africa. Mostly of komatiite are Archean age distributed in the Archaean shield areas. Also a few are Proterozoic and Phanerozoic. In all ages komatiites are highly magnesium. Mostly a volcanic rock; occasionally intrusive. Mafic rocks were identified as extrusive because of their volcanic textures and structures, and they seem to have been accepted as a normal component of Archean volcanic successions, Abitibi in Canada. The ultramafic rocks were interpreted as intrusive which are founded as sills and dykes, Barberton in South Africa. Spinifex texture-typical of Komatiites:

Komatiite

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The name ophiolite derived from Greek root which means Ophio : snake or serpent Litho : Stone The green colour, structure and texture of sheared ultramafic rocks is similar to some serpents The term ophiolite was initially given to dark green shiny outcrops which composed of serpentines (serpentinite rocks) later on become used not only to a single rock , but also to an association of related rock types which are found as a consistent of upper mantle rocks and oceanic crust. ophiolite sequence Sediments Pillow Lavas Dykes Gabbros Layered Gabbro Layered Peridotite Upper mantle

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