The original rock that has undergone metamorphism is called the protolith. Protolith can be any type of rock and sometimes the changes in texture and mineralogy are so dramatic that is difficult to distinguish what the protolith was. Note that diagenesis and weathering are also a changes in form that occur in rocks.

Geochemical signatures for eclogite protolith from the Maksyutov Complex, South Urals. September 2004; Journal of Asian Earth Sciences 23(5):745-759; DOI: 10.1016/S1367-9120(03)00128-7.

The protolith of the Kaalvallei eclogites also experienced Fe enrichment and Ca depletion with increasing alteration. Eclogite (Muenchberg Gneiss Massif; Early Ordovician protolith, about 480 Ma; Late Devonian metamorphism, about 365 Ma; Wissenstein, just south of Stammbach, Frankenwald Forest, Bavaria, southeast-central Germany) 1 (15097930745).jpg 734 × 837; 855 KB. On the contrary, both the Jericho DIs and host eclogite garnets have small negative Eu and Sr anomalies, fractionated HREE patterns ((Lu N /Gd N)~3-5) and pristine mantle-like δ 18 O values of 5.2-6.0‰, indicating that shallow, plagioclase-rich oceanic crust protoliths are unlikely.The eclogitic DI trace-element characteristics require that both garnet and plagioclase were present in the protolith, which likely crystallized in the shallow upper mantle. printing (Fig. 2a). The protolith is low-K basalt in composition and exhibits geochemical characters of normal-type MORB (N-MORB) affinity (Song et al.

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High-Mg olivine (forsterite with #Mg > 90) is often found in mantle peridotite or is enclosed in micro- and  Our data provide new constraints on the timing of eclogite metamorphism within of the age of the magmatic eclogite protolith on Stolbikha Island, Gridino area,   23 Jun 2005 The window is even broader for Si-poor eclogites such as cumulates and many non-MORB protoliths. If the lower mantle is denser than pyrolite (  bimineralic xenoliths, diamond-bearing eclogite, corundum-bearing eclogite eclogite) are considered to derive from a heterogeneous protolith. Eclogite  of eclogite and amphibolite do not define a whole rock iferous (Viséan) thrusting of the Teplá (~500 Ma) for the metagabbro protolith in the com- (1990). Abstract: On the basis of trace-element data, basaltic protoliths for Paleozoic eclogites from the Yukon–Tanana terrane. (YTT) have diverse origins. Eclogites  under eclogite-facies metamorphism and thereafter variably affected by retrograde processes.

90 Eclogite … The internal structures of zircons in eclogite from Huangzhen have been studied by cathodoluminescence (CL) microscopy. Two growth stages were distinguished: protolith magmatic cores and metamorphic overgrowth rims. These different domains were analyzed for trace elements using LAM-ICP-MS.

2011-07-02 · Eclogite is also the name of one of the metamorphic facies. A metamorphic facies is a region of pressure-temperature space in which characteristic metamorphic minerals form. Most eclogite facies are eclogites– that is, they are basalts or gabbros which have experienced metamorphism at eclogite facies pressures and temperatures.

printing (Fig. 2a).

A metamorphic facies is a set of mineral assemblages in metamorphic rocks formed under similar pressures and temperatures. The assemblage is typical of what is formed in conditions corresponding to an area on the two dimensional graph of temperature vs. pressure (See diagram in Figure 1).

The zeolite facies was first described from southern New Zealand, but similar rocks … Eclogite contains no plagioclase although its protolith is full of this mineral. The protoliths of eclogites are igneous rocks with a basaltic composition (basalt, diabase , gabbro ).

We present textural and chemical characterizations of suites of Retrograde eclogites (ranging from unaltered eclogite to retrograde blueschist and greenschist mantling the eclogite boulders) from Ring Mountain on the Tiburon Peninsula, near San Francisco, California, were examined for whole-rock major and trace elements to assess protolith compositions and the geochemical signature of fluids associated with retrogression. The protolith of the Kaalvallei eclogites also experienced Fe enrichment and Ca depletion with increasing alteration. In addition, population A eclogites exhibit Sr and Nd isotopic compositions similar to oceanic tholeiites.
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427-452. Protolith: Metamorphic: Facies: Eclogite: Common minerals: Omphacite Pyrope Quartz Kyanite Rutile: Eclogite in hand sample. Sheared eclogite from the Italian Alps Eclogite (7.1 cm across at its widest) from the Nordfjord jsjgeology.net Protolith age : early Early Ordovician, ~480 m.y. jsjgeology.net Contrary to this, we demonstrate that the Gubaoquan eclogite protolith was a Neoproterozoic basic dyke/sill which intruded into Proterozoic continental rocks.

indicating their crystallisation from a protolith with a short crustal residence time.
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and orthopyroxene rich eclogite have not been studied yet. The eclogite in the Flem Gabbro from Flemsøya in the Western Gneiss Region (WGR), Norway, is exceptional due to its peculiar mineral assemblage of olivine and orthopyroxene, which were inherited from an olivine gabbro protolith [8,33]. This eclogite body may once have been situated

Reactions are often not complete, and typical metamorphic fabrics may be poorly developed or not developed at all. This is the facies of burial metamorphism. The zeolite facies was first described from southern New Zealand, but similar rocks have Eclogite facies metamorphism of the lithosphere forms dense mineral assemblages at high- (1.6–2.4 GPa) to ultra-high-pressure (>2.4–12 GPa: UHP) conditions that drive slab-pull forces during Figure 2-8 Photomicrographs of eclogite in the St. Cyr klippe. (a) Well-preserved eclogite sample 11-101 with a peak assemblage of omphacite, garnet, and rutile.

Geochemistry of eclogite- and blueschist-facies rocks from the Bantimala Complex, South Sulawesi, Indonesia: Protolith origin and tectonic setting ADI MAULANA,1,2,3*ANDREW G. CHRISTY,1,4 DAVID J. ELLIS,1 AKIRA IMAI,5 AND KOICHIRO WATANABE3 1Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia, 2Department

Extended Abstract 2. 10 th International Kimberlite Conference, Bangalore - 2012. formation at low pressures, albeit in a scenario where either. Each aluminum oversaturation in the eclogite protolith, which can not be incorporated in garnet and omphacite, crystallized in the eclogite as kyanite (nesosilicate). (a) Zircon grains from mantle eclogite xenolith sample 106/505 (G3-12) from the V. Grib kimberlites, Arkhangelsk province (modified after Skublov et al.

The protolith to the eclogite is believed to be a Fe- and Ti-rich gabbro of Pro-terozoic age. Transformation into eclogite is related to Cale-donian high-pressure metamorphism at ca. 400 Ma. During this process, ilmenite in the gabbro protolith was replaced by rutile. The eclogite body is subdivided into a leuco-eclogite and a ferro-eclogite Based on compositional zoning in garnet and application of diffusion modelling, we propose that eclogite-facies metamorphism of the mafic protolith and its host lithologies occurred at, or near, UHP conditions. The core garnet (I) formed at 650 °C at 8 Myr in the coesite stability field and was partially resorbed during the onset of exhumation. Examine the sample labeled eclogite, which forms when basalt or gabbro is metamorphosed at very high pressure, such as deep in a subduction zone, 1. Note the bimodal color of this rock.