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EVOLUTIONARY MODEL OF THE MELIATA BLUESCHISTS
The Meliata blueschists are subdivided into four groups which are characterized by different litholo-gies and metamorphic histories: (1) Marbles, intercalated with metabasalts and glaucophane-bearing phyllites. Phengite from this group metabasalts and phyllites records the Middle Jurassic age which is interpreted to date the high-pressure metamorphism; (2) Metabasites and micaschists, devoid of marbles contain relic muscovite and newly formed high-Si phengite. The relic muscovite gives Palaeozoic age; (3) Quartz phyllites indicate a polyphase evolution characterized by greenschist facies metamorphism followed by blueschist-facies over-print; the high-Si micas provide evidence of an early Middle Jurassic age of the high-pressure metamorphism; (4) Amphibolite-facies slices and blocks, overprinted by blueschist-facies metamorphism, represent old base-ment rocks. Lithological and metamorphic characteristics together with radiogenic ages of high-pressure micas indicate a subduction of a continental wedge prior to that of oceanic crust can be assumed.
EVOLUTIONARY MODEL OF THE MELIATA BLUESCHISTS
The Meliata blueschists are subdivided into four groups which are characterized by different litholo-gies and metamorphic histories: (1) Marbles, intercalated with metabasalts and glaucophane-bearing phyllites. Phengite from this group metabasalts and phyllites records the Middle Jurassic age which is interpreted to date the high-pressure metamorphism; (2) Metabasites and micaschists, devoid of marbles contain relic muscovite and newly formed high-Si phengite. The relic muscovite gives Palaeozoic age; (3) Quartz phyllites indicate a polyphase evolution characterized by greenschist facies metamorphism followed by blueschist-facies over-print; the high-Si micas provide evidence of an early Middle Jurassic age of the high-pressure metamorphism; (4) Amphibolite-facies slices and blocks, overprinted by blueschist-facies metamorphism, represent old base-ment rocks. Lithological and metamorphic characteristics together with radiogenic ages of high-pressure micas indicate a subduction of a continental wedge prior to that of oceanic crust can be assumed.
EVOLUTIONARY MODEL OF THE MELIATA BLUESCHISTS
Shah Wali Faryad (author)
1997
Article (Journal)
Electronic Resource
Unknown
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STRUCTURAL AND PETROLOGICAL IN DICATORSOF THE SURFACING OF MELIATA BLUESCHISCHT FACIES ROCKS
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