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Eclogite |
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eclogiteAny member of metamorphic rocks whose original composition is similar to that of basalt. Eclogites consist primarily of green pyroxene (omphacite) and red garnet (pyrope), with small amounts of various other minerals such as kyanite and rutile. These minerals in the eclogite are the result of reactions in originally igneous minerals having been subjected to extremely high pressures and moderate to relatively high temperatures. eclogite [′ek·lə‚jīt] (petrology) A class of metamorphic rocks distinguished by their composition, consisting essentially of omphacite and pyrope with small amounts of diopside, enstatite, olivine, kyanite, rutile, and rarely, diamond. Eclogite a metamorphic rock, composed chiefly of clinopy-roxene and garnet. The clinopyroxene (omphacite) is a mixture of diopside, hedenbergite, and jadeite components; the mixed-composition garnet contains pyrope and almandine, as well as variable amounts of grossularite and andradite. Eclogite varieties with significant amounts of grossularite and disthene (kyanite) are called grospydites. Various types of eclogite are distinguished according to the content of secondary minerals, including amphibole, enstatite, olivine, plagioclase, kyanite (disthene), corundum, rutile, graphite, and diamond-containing eclogites. Three types are distinguished on the basis of geological conditions of occurrence: the eclogites of the metamorphic zone, which are associated with glaucophane schists and alpine-type hyperbasites; the eclogites of granulite, gneiss, and amphibolite metamorphic complexes; and eclogites that form inclusions (xenoliths) in kimberlites and alkali basaltoids. The first two are formed within the crust; the last is of mantle origin. Deposits of rutile are associated with eclogite, and diamonds are found among the most deep-seated eclogites in kimberlite pipes. A. A. MARAKUSHEV Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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No references found | Eclogite dates are rarely reset, and the authors found that eclogite from both sides of the Motagua dates to roughly 130 million years old. In addition, the flat HREE patterns are also a strong argument that the magmas are not directly derived from melting of the subducted slab, because oceanic lithosphere subducted to 110 km depth would be metamorphosed to eclogite (a garnetomphacite bearing metamorphic rock). Comment on "Redistribution of trace elements during prograde metamorphism from lawsonite blueschist to eclogite facies; implications for deep subduction-zone processes" by C. |
Eclogite |
ecliptic Ecliptic circle Ecliptic circle Ecliptic coordinate system Ecliptic coordinate system Ecliptic coordinates Ecliptic coordinates ecliptic diagram Ecliptic latitude Ecliptic latitude ecliptic limits Ecliptic longitude Ecliptic longitude Ecliptic peak Ecliptic peak Ecliptic plane Ecliptic plane ecliptic pole ecliptics ecliptics Ecliptiq Radio ECLIS ECLJ ECLKC ECLL ECLM ECLN ECLO ECLOF Ecloga Eclogite Eclogite FaciesEclogite Facies eclogue eclogue Eclogues Eclogues Eclose Eclose eclosion eclosion eclosion eclosions eclosions ECLP ECLPSS ECLQ ECLR ECLRS ECLS ECLS ECLS-B ECLS-K ECLSG ECLSO ECLSP ECLSS ECLT ECLU ECLW ECLWA | |||||||
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