1 edition of Italian eclogites and related rocks found in the catalog.
Italian eclogites and related rocks
|Statement||edited by Lauro Morten.|
|Series||Scritti e documenti,, 13|
|Contributions||Morten, Lauro., International Eclogite Conference (4th : 1993 : Università della Calabria)|
|LC Classifications||QE475.E25 I85 1993|
|The Physical Object|
|Pagination||275 p. :|
|Number of Pages||275|
|LC Control Number||97128505|
Geologic history, stratigraphy, and tectonics Paleozoic ( million years ago) The oldest rocks in Italy may include oceanic crust subducted during the Caledonian orogeny and million year old Ordovician granites. Only detrital zircons in the Alps dates to the Precambrian.. These granites are located offshore of Venice, found in the Agip Assunta well and deformed, . The eclogites (from Gr. a selection) are mostly coarse-grained and massive aggregates of green monoclinic pyrox ene and red garnet, but some varieties possess green hornblende wholly or partly replacing the pyroxene, thus giving rise to the two important groups—the pyroxene and the hornblende eclogites.
Current knowledge on the solidus temperature for carbonated eclogites suggests that carbonatitic liquids should not form from a subducted oceanic lithosphere at sub-arc depth. However, the oceanic crust includes a range of gabbroic rocks, altered on rifts and transforms, with large amounts of anorthite-rich plagioclase forming epidote on metamorphism. metavolcanic rocks include eclogite, omphacitite, epidosite, and blueschist (e.g., Klemd et al. ). Garnet, omphacite, zoisite, epidote minerals,phen-gite, paragonite, sodic amphibole, quartz, titanite, and rutile are present in all maﬁc rocks in variable modal proportions. Eclogites and omphacitites oc-cur as pods (15–25 cm in diameter.
ECLOGITE. Eclogite is an attractive, uncommon, crystalline-textured, very high-grade metamorphic rock. It is dominated by green & red minerals. The red is pyrope or almandine garnet. The green is omphacite pyroxene. Eclogite appears to be moderately common in portions of the upper mantle, but it occurs in very few places at the Earth's surface. bodies and the eclogites are then structurally incongruent with the gneiss. 4. Tight folds in the banded eclogites indicate that they have experienced a period of very plastic deformation although they were obviously com petent rocks relative to .
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Eclogite, any member of a small group of igneous and metamorphic rocks whose composition is similar to that of tes consist primarily of green pyroxene (omphacite) and red garnet (pyrope), with small amounts of various other stable minerals—e.g., are formed when volcanic or metamorphic rocks rich in such mafic minerals are subjected to extremely high.
Three groups of eclogites are referred to as group A (former basaltic intrusions within metamorphic rocks of the amphibolite facies), group B (inclusions or xenoliths from great depths), and group C eclogites (former subducting oceanic lithosphere).
Group A eclogites frequently contain quartz, kyanite, and zoisite. Eclogites are predicted to be thermodynamically stable also in the lower crust beneath cratonic regions. However, xenolith suite studies indicate that kinetic and/or compositional factors limit their distribution in the lower continental crust relative to.
(a) Eclogites from the mantle (i.e. group I of Smulikowski and group A of Coleman et al.). These eclogites are associated with ultrabasic rocks, either in Italian eclogites and related rocks book bodies or as xenoliths in kimberlite pipes.
They were involved in the “eclogite layer” controversy presented in Section Moreover, their origin (mantle melt or subducted Cited by: Some UHP rocks appear to record burial at depths greater than km.
Eclogites containing lawsonite (a hydrous calcium-aluminium silicate) are rarely exposed at Earth’s surface, although they are predicted from experiments and thermal models to form during normal subduction of oceanic crust at depths between ~ kilometers. Phase petrology of eclogites and related rocks from the Motalal~ella high-pressure metamorphic complex in Spitsbergen (Arctic Ocean) and its signifi- cance.
Lithos, A Caledonian eclogite suite is associated with lower-grade high-pressure rocks in Motalai~ella, Oscar II Land, central-western by: The ultrahigh-pressure minerals in these rocks, although occurring spatially related to accretionary prism blueschists and eclogites of subducted crustal origin, do not yield information about the Himalayan subduction–collision process.
Instead, they are unusual relict phases preserving evidence of unrelated deep-mantle processes. Lappin, M. (): On the occurrence of kyanite in the eclogites of the Selje and Åheim districts, Nordfjord. Norsk Geologisk Tidsskrift + plate Sunnfjord; Førde; Kvineset ⓘ Roadcut Rv 5; Krogh, E.J.
(): Geochemistry and petrology of glaucophane-bearing eclogites and associated rocks from Sunnfjord, Western Norway. Mineralogy of New Caledonian eclogite meta-acidites. Discussion. Conclusions. Meta-acidites and silicic meta-sediments related to eclogites and glaucophanites in northern Sifnos, Cycladic Archipelago, Greece (M.
Schliestedt, M. Okrusch). Introduction. General geology. The high-pressure sequence on Sifnos. Petrography. Bulk-rock chemistry. Eclogites are beautiful rocks that form deep within subduction vast majority of subducted oceanic crust becomes more dense than the surrounding mantle rocks and travels to the strange world of the deep for.
Eclogites are rocks of gabbroic-basaltic composition and consist primarily of two minerals: a grass-green clinopyroxene called omphacite and a red or red-brown garnet. In spite of the basaltic composition, plagioclase does not occur in eclogites. Petrogenetically, this is very significant.
Eclogite is rock of mafic composition (igneous rock relatively low in silica) that has been buried to 50 kilometres or more. At this depth, everyday minerals such as plagioclase feldspar or augite are no longer stable and they break down, allowing the rock to grow new denser (more attractive) minerals that are better suited to higher pressures.
By using U–Pb geochronology on eclogites and related rocks in the MLC, we will demonstrate not only the difficulty of dating high-pressure rocks in general, but also show that the MLC does not represent, as previously thought, an allochthon of Palaeozoic origin.
EUROPEAN ECLOGITES. CALIFORNIA ECLOGITES. San Martin. Calaveras Valley. Tiburon. San Jose. OREGON ECLOGITES. CONCLUSION. THE term "eclogite" was first introduced into the geological literature of Europe in by Haiiy in his Traith de mineralogie, in which he gave the name to a rock composed chiefly of green augite and garnets.
Chemical analyses of thirteen rocks, eight garnets, six clinopyroxenes, and nine amphiboles are presented. Field evidence shows that the eclogites and associated mafic rocks occur as sheets or lenses conformable with pelitic and calcareous rocks and have been metamorphosed in situ.
The associated country rocks have attained a metamorphic. Search the world's most comprehensive index of full-text books. My library. 1 Eclogites and the eclogite facies: definitions and classifications.- 2 Eclogite facies mineral parageneses.- 3 Experimental studies on the stability of eclogite facies mineral parageneses.- 4 Mineral barometry and thermometry.- 5 Role of kinetics in the formation and preservation of eclogites.- 6 Isotopic systems-geochronology of eclogites.- 7 Occurrence and stability.
Philippot P () Fluid–melt-rock interaction in mafic eclogites and coesite-bearing metasediments: constraints on volatile recycling during subduction. Chem Geol – Google Scholar Philippot P, Selverstone J () Trace element rich brines in eclogitic veins: implications for fluid composition and transport during subduction.
Lawsonite blueschists and lawsonite eclogites as proxies for palaeo-subduction zone processes: A review Article (PDF Available) in Journal of Metamorphic Geology 32(5). Books at Amazon.
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The Koidu eclogites range from nearly pristine rocks with alteration restricted to grain boundaries (e.g., KEC ) to samples with highly altered, opaque clinopyroxene with small relict areas of pristine omphacite in the centers of crystals (e.g., KEC ) (see Fig.
1 of Hills and Haggerty, ). Numerous.Many blueschists and eclogites are inferred to have formed from oceanic basalts in subducted slabs. Knowledge of their elastic behavior is essential for reconstructing the internal structure of subduction zones. The Cycladic blueschist unit, exposed on Syros Island (Greece), contains rocks belonging to an exhumed Tertiary subduction complex.eclogites and eclogite-facies rocks.
Sobolev and Shatsky (), Schreyer (), Coleman and Wang (), Chopin and Sobolev () have given detailed historical accounts of these dis.