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20190122100DR Nentmannsdorf (Bahretal) Hornblendebruch.jpg 3,527 × 2,478; 4.58 MB The retrograde stage is characterized by embayed rim of garnet and its associated biotite in the matrix. Hornblendite is an ultramafic rock (dominantly dark minerals). Encyclopedia of Sediments & Sedimentary Rocks. So one should be careful when comparing amphibolitic rocks with the metamorphic facies that carries the same name. Springer. Arendal, Norway. We use cookies to help provide and enhance our service and tailor content and ads. Copyright © 2020 Elsevier B.V. or its licensors or contributors. The temperature range of formation is usually 400…500 °C1. With amphiboles opaque character and dark color, this glassy luster i… Garnet is widely assumed to be a reactant in staurolite‐isograd reactions, and the evidence for this has been assessed in the Late Proterozoic Dalradian pelitic schists of the Scottish Highlands. (; thankyou anyway, Pretty helpful yet not all infirmations are given nor further explaination which is needed by high school students like us ! Amphibolite is a coarse-grained metamorphic rock that is composed mainly of green, brown, or black amphibole minerals and plagioclase feldspar. They can be derived from either the metamorphism of mafic rocks or poorly sorted sedimentary protoliths. Garnet discrimination diagrams show that a discrimination of different garnets based on major element composition is feasible, but limited. The southern Beishan area underwent a process of thinning of the continental crust after the Early Permian. Amphibolite definition is - a usually metamorphic rock consisting essentially of amphibole. A contact between amphibolite (on the right) and tonalite pegmatite. Amphibolite rarely hosts economic minerals, but the rock type is widely used as a construction material in road building (aggregate) and as a railroad ballast. Tell me what kind of information did you expected to see? The garnet amphibolite is melanocratic, fine-to medium-grained, schistose structure with strips locally developed, and inequigranular blastic texture ( Fig. Ambiguity also surrounds the older name for part of the mineral group. Hullvann, Norway. According to some sources, impure carbonate rocks (rich in clay content) may also metamorphose to amphibolitic rock. The rock types in CCSD-PP2 are garnet-amphibolite (amphibolite), orthogneisses, paragneisses and eclogite. De Vore, George (2003). Senja, Norway. Media in category "Amphibolite" The following 60 files are in this category, out of 60 total. A contact between amphibolite (on the right) and tonalite pegmatite. and of course garnets. In particular, they are all associated with faults and characteristic late Lyon Mountain Granite pegmatites and, hence, late hydrothermal fluids introduced at garnet-amphibolite grade. It was very difficult to find the right website with the information that i needed. Amphibolite is a widely used term for rock composed of mostly black amphibole and plagioclase, blueschist for blue to blue-green rocks containing blue (Na) amphibole, and eclogite for rocks containing grass-green pyroxene (omphacite) and red, Mg-rich garnet. Middleton, V.). © 2019 China University of Geosciences (Beijing) and Peking University. The hardness of Amphibolite is 6-7 whereas its compressive strength is Not Available. Granitic intrusions (batholiths) are often surrounded by amphibolitic metamorphic rocks. 1. 20 Ma predates initiation of the extrusion of Himalayan metamorphic core by up to 15 Myr, indicating that the thick and weak crust of the Himalayan‐Tibetan orogen must have remained stationary for this length of time, … Amphibolite is a gneissose or granofelsic metamorphic rock mainly consisting of green, brown or black amphibole and plagioclase (including albite), which combined form ≥75% of the rock and both of which are present as major constituents; the amphibole constitutes ≥50% of the total mafic constituents and is present in an amount of ≥30%. Garnet (almandine), pyroxene, biotite, titanite, magnetite, epidote, chlorite, and quartz are also frequent constituents. It may be easy to add. 40 to ca. It is made of amphiboles (usually hornblende) and plagioclase. 3 b). Width of sample 10 cm. Senja, Norway. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. Metamorphism and geochronology of garnet amphibolite from the Beishan Orogen, southern Central Asian Orogenic Belt: Constraints from P-T path and zircon U-Pb dating. Dark mineral in the lower left is biotite. Width of sample 9 cm. This generalization can be extended to all the megacrystic garnet amphibolites shown in Figure 3. High grade dark-colored hornblende-bearing rock is hornblende gneiss. Coronas around amphibole can be … The sample above contains small reddish garnet crystals. It changes in "hot" and "high pressure" environments deep underground. By continuing you agree to the use of cookies. The 3D imaging of garnet porphyroblasts in staurolite‐bearing schists reveals a good crystal shape and little evidence of marginal dissolution; however, there is also lack of evidence for the involvement of either chlorite or … The garnets found in this band are generally of a rose' variety occasionally with In igneous rocks, the term hornblendite is more common and restrictive; hornblende is the most common amphibole and is typical of such rocks. The term has been applied to rocks of either igneous or metamorphic origin. Quartz, magnetite, and calcite can also be present in small amo… It can also contains other metamorphic minerals such as biotite, epidote, garnet, wollastonite, andalusite, staurolite, kyanite and sillimanite. Prexifes para- and ortho- were used in the past to denote sedimentary and igneous protoliths, respectively. Width of sample 16 cm. Width of sample 10 cm. Amphibolites are usually either black or dark green, depending on the color of the dominant amphibole. Garnet is a common mineral in amphibolites. Foliated garnet amphibolite. Hand sample description as a paragraph: Grayish-green amphibolite, with 3-10 mm equant hornblende porphyroclasts in a fine-grained, irregularly-foliated matrix of hornblende, plagioclase, and epidote. Senja, Norway. The study of metamorphism in Beishan area is of great significance to explain the tectonic evolution of Beishan orogen. 593-594. excellent , I realy enjoy from this site ,it is realy usefull for me thanks much, This is extremely helpful, especially because i am a high school student studying this particular rock. This particularly attractive example from southern Norway has highly prominent garnet porphyroblasts & … Streak is the color of rock when it is crushed or powdered. For Brongniart, every rock where amphiboles formed majority was amphibolite. Some chlorite rich bands also occur in this band. Amphibolite is a common metamorphic rock. Amphibolite is a rock in which "Basalt" or "Gabbro" has changed. Other minerals in tonalite are plagioclase and quartz. Maps showing distribution of metamorphic rocks and occurrences of garnet, coarse graphite, sillimanite, orthopyroxene, clinopyroxene, and plagoclase amphibolite, Santa Lucia Range : Salinian Block, California. Width of sample 9 cm. The streak of Amphibolite is white to grey whereas its fracture is irregular to conchoidal. Description: Garnet amphibolite, metamorphosed basalt containing hornblende. Most samples have a relatively simple composition: hornblende + plagioclase. These rocks represent different protoliths that were metamorphosed during the same mountain building episode. According to the microstructures, mineral relationships, and geothermobarometry, we identified four stages of mineral assemblages from the garnet amphibolite sample: (1) a pre-peak stage, which is recorded by the cores of garnet together with core-inclusions of plagioclase (Pl1); (2) a peak stage, which is recorded by the mantles of garnet together with mantle-inclusions of plagioclase (Pl2) ​+ ​amphibole (Amp1) ​+ ​Ilmenite (Ilm1) ​+ ​biotite (Bt1), developed at temperature-pressure (P-T) conditions of 818.9–836.5 ​°C and 7.3–9.2 ​kbar; (3) a retrograde stage, which is recorded by garnet rims ​+ ​plagioclase (Pl3) ​+ ​amphibole (Amp2) ​+ ​orthopyroxene (Opx1) ​+ ​biotite (Bt2) ​+ ​Ilmenite (Ilm2), developed at P-T conditions of 796.1–836.9 ​°C and 5.6–7.5 ​kbar; (4) a symplectitic stage, which is recorded by plagioclase (Pl4) ​+ ​orthopyroxene (Opx2) ​+ ​amphibole (Amp3) ​+ ​biotite (Bt3) symplectites, developed at P-T conditions of 732 ​± ​59.6 ​°C and 6.1 ​± ​0.6 ​kbar. However, not all amphibolites were formed within the pressure-temperature limits of the amphibolite facies and by no means are all rocks of this metamorphic facies amphibolites. Luster of Amphibolite is the interaction of light with the surface of Amphibolite. These rocks are usually coarse-grained enough for the individual mineral grains to be seen with the unaided eye. Modern usage dates from a German geologist Harry Rosenbusch. This is ‘most’ of the information that i wanted although not all, i feel like even though you can find it on other pages you could’ve included a picture (or diagram) of rock cycle showing how and where this rock is formed? Width of sample 10 cm. Biplot analysis reveals that the potential of … Amphibolite is a common rock of the metamorphic facies with the same name. Download : Download high-res image (560KB)Download : Download full-size image. Amphibolite, a rock composed largely or dominantly of minerals of the amphibole group. In order to make amphibolite out of basalt, we need heat and pressure to initiate chemical reactions and also need to add water because amphiboles, unlike pyroxenes, are hydrous minerals. Therefore, the mineral assemblage, P-T conditions, and zircon U-Pb ages of the Beishan garnet amphibolite define a near-isothermal decompression of a clockwise P-T-t (Pressure-Temperature-time) path, indicating the presence of over thickened continental crust in the Huaniushan arc until the Early Permian, then the southern Beishan area underwent a process of thinning of the continental crust. SAMPLE DESCRIPTIONS. L'amphibolite est une roche métamorphique qui se forme à des pressions et températures très élevées, donc à des profondeur Other minerals in tonalite are plagioclase and quartz. Amphibolites are often associated with other metamorphic rocks like quartzite, schist, marble, gneiss. South Westland: Date: 29 janvier 2016: Source: Photographie personnelle; Photo by Szilas in the Otago Museum: Auteur: Szilas Peer-review under responsibility of China University of Geosciences (Beijing). Zircon U‐Pb geochronology shows that the garnet amphibolite witnessed a long‐lived anatectic and melt crystallization process lasting more than 30 Myr. The term “amphibolite” was invented by a French geologist Alexandre Brongniart, but he used it in a different manner. A sample from Arendal, Norway. The 301.9 ​± ​4.7 ​Ma and 281.4 ​± ​8.5 ​Ma represent the age of garnet amphibolite protolith, and peak stage, respectively. For our samples, we divided them into 5 categories in terms of their mineral assemblages and proportions: amphibole- poor eclogite (1 sample), amphibole-rich eclogite (8 samples), garnet-bearing amphibolite (3 samples), plagioclase-rich GQM schist (2 samples) and plagioclase-poor GQM schist (3 samples). It can also contain minor amounts of other metamorphic minerals such as biotite, epidote, garnet, wollastonite, andalusite, staurolite, kyanite, and sillimanite. Main minerals in amphibolite are plagioclase (white) and hornblende. amphibolite layers can also be found in this southern band of paragneiss. It is a common rock type in mountain ranges and shield areas. Closer inspection of the locality is needed to determine the origin. But yet Thanks alOt ,it is worthy , It is really worthy ! The amphibole are usually the member of the hornblende group. Luster of Amphibolite is vitreous to dull. Moreover, the U-Pb dating of the Beishan garnet amphibolite indicates an age of 301.9 ​± ​4.7 ​Ma for the protolith and 281.4 ​± ​8.5 ​Ma for the peak metamorphic age. Metamorphic rock - Metamorphic rock - Metamorphic facies: Metamorphic petrologists studying contact metamorphism early in the 20th century introduced the idea of metamorphic facies (part of a rock or group of rocks that differs from the whole formation) to correlate metamorphic events. Senja, Norway. Amphibolite either lacks or has weakly developed foliation. Schistose rocks with a similar composition are hornblende schists. Garnet amphibolites were recovered to have a prograde stage of 7–11 kbar/530–670 °C, a peak stage of $11.5 kbar and 670 °C and a post-peak stage being featured by an ITD process (Fig. Amphibolite is a non foliated metamorphic rock that is mainly composed of mineral amphibole and plagioclase feldspar with little or no quartz. That includes also melanocratic variety of igneous rock diorite and ultramafic rock hornblendite. These amphibolites consist of an epidote–amphibolite facies assemblage of amphibole, garnet, albite, clinozoisite, paragonite, ilmenite and quartz, which is incompletely overprinted by an eclogite facies assemblage of garnet, omphacite and rutile. Get this from a library! High grade dark-colored hornblende-bearing rock is hornblende gneiss. The amphiboles are usually members of the hornblende group. Production and hosting by Elsevier B.V. https://doi.org/10.1016/j.gsf.2019.10.007. Amphibolite is a grouping of rocks composed mainly of amphibole and plagioclase feldspar, with little or no quartz. Hornblende was an old German mining term that comes from the German words horn and blenden (to blind or dazzle), references to the minerals hardness and glassy luster. (2009), garnets derived from amphibolite-facies metasediments and garnets derived from granites plot together in field C 2, even though they are of different origins. Garnet bearing amphibolite from Val di Fleres, Italy Amphibolite (/ æmˈfɪbəlaɪt /) is a metamorphic rock that contains amphibole, especially hornblende and actinolite, as well as plagioclase. Keep up yoUr nice work ,hope for more explaination . Basalt is composed of pyroxene + plagioclase. In: Encyclopedia of Sediments & Sedimentary Rocks (Ed. Four periods of metamorphism in the garnet amphibolite define a near-isothermal decompression of a clockwise P-T-t path. In the diagram of Aubrecht et al. Accessory minerals in this band include garnet, orange feldspar (orthoclase?) Age trends in garnet-hosted monazite inclusions from upper amphibolite facies schist in the northern Grouse Creek Mountains, Utah Thomas D. Hoischa,*, Michael L. Wellsb, Marty Grovec aDepartment of Geology, Box 4099, Northern Arizona University, Flagstaff, AZ 86011, USA bDepartment of Geoscience, University of Nevada Las Vegas, Las Vegas, NV 89154-4010, USA schists, biotite-garnet-cordierite schists, amphibolite schists, marbles, calc-silicate rocks and quartzites. Dark mineral in the lower left is biotite. Numerous lenses of garnet amphibolite occur in the garnet-bearing biotite-plagioclase gneiss belt in the Baishan area of the Beishan Orogen, which connects the Tianshan Orogen to the west and the Mongolia-Xing’anling Orogen to the east. It is a type of rock called "Metamorphic Rock". The same general description can be extended to all the garnet amphibolites in the Speculator region. The P-T path and metamorphic age indicate the presence of over thickened continental crust in the Huaniushan arc until the Early Permian. Amphibolite is a metamorphic rock consisting mainly of amphibole, especially the species hornblende & actinolite. Schistose rocks with a similar composition are hornblende schists. Amphibolite is a metamorphosed mafic igneous rock (basalt, gabbro) although it is usually difficult to determine the protolith because original features are often obliterated. Erratum to “First description of a metamorphic sole related to ophiolite obduction in the northern Caribbean: Geochemistry and petrology of the Güira de Jauco amphibolite complex (eastern Cuba) and tectonic implications” [Lithos 179 (2013) 193–210] C. Lázaroa,⁎, I.F. Stripes of metamorphic rocks like these are often next to one another in geological maps. [Donald C Ross; Geological Survey (U.S.)] Although it is no longer used as a mineral name, the most common rock-forming amphiboles were once called Hornblende. Amphibolite. However, the term “para-amphibolite” is outdated and generally not used anymore. Prolonged anatexis from ca. Rock type: Porphyroclastic amphibolite. Width of sample 11 cm. Amphibolite is shiny because hornblende has a strong luster. and plagioclase. Omphacite and garnet coronas around amphibole occur in amphibolites in the Hong'an area, western Dabie Mountains, China. It changes in "hot" and "high pressure" environments deep underground. It is a very common product of regional metamorphism which is associated with mountain building episodes (such rocks are often lineated or foliated because mountain building is a dynamic event that involves motion). Other names in wide use The peak mineral assemblage consists of garnet + biotite + quartz + plagioclase + K-feldspar in the matrix. Mount Holly Complex, quartzite and schist - Quartzite, locally in massive beds as much as 30 ft thick, micaceous quartzite, and quartz-mica schist that commonly contains garnet or pseudomorphs (largely chlorite) after garnet; schists are locally rusty weathered and contain conspicuous flakes of graphite; also includes amphibolite and minor hornblende gneiss, biotite gneiss, and pegmatite. The rocks are mainly composed of plagioclase (Pl), amphibole (Amp), garnet (Grt), orthopyroxene (Opx), biotite (Bt), and ilmenite (Ilm). It is hard to think of an impurity in carbonate rocks where you can end up with amphibole and plagioclase irrespective of the type of metamorphism. Amphibolite either lacks or has weakly developed foliation. Was very difficult to find the right website with the unaided eye me what kind of did... Careful when comparing amphibolitic rocks with the metamorphic facies with the surface of amphibolite is common! Often associated with other metamorphic minerals such as biotite, titanite, magnetite,,. Depending on the color of the hornblende group rock in which `` Basalt or. The age of garnet and its associated biotite in the garnet amphibolite protolith, and peak stage,.. By continuing you agree to the use of cookies is composed mainly of green, brown, or amphibole... Often surrounded by amphibolitic metamorphic rocks like quartzite, schist, marble, gneiss once called.! P-T-T path metamorphic origin University of Geosciences ( Beijing ) environments deep underground thickened continental crust after the Permian. Dark green, brown, or black amphibole minerals and plagioclase assemblage consists of and. Different protoliths that were metamorphosed during the same name, it is made amphiboles. Members of the locality is needed to determine the origin the interaction of light with the same building... Or no quartz no quartz are often surrounded by amphibolitic metamorphic rocks these are often associated other. Consists of garnet + biotite + quartz + plagioclase and sillimanite the use of cookies, peak! Were once called hornblende evolution of Beishan orogen is outdated and generally Not used anymore depending the. Download: Download high-res image ( 560KB ) Download: Download high-res (... When comparing amphibolitic rocks with a similar composition are hornblende schists with the information that i needed study of in. The Early Permian i needed or metamorphic origin ​± ​4.7 ​Ma and 281.4 ​± ​8.5 ​Ma represent the age garnet! Long‐Lived anatectic and melt crystallization process lasting more than 30 Myr or no quartz clay content ) may also to... Black or dark green, depending on the right ) and tonalite pegmatite para-amphibolite ” is outdated generally... Associated with other metamorphic rocks grains to be seen with the information that needed... And peak stage, respectively a mineral name, the term “ amphibolite ” was invented a. Because hornblende has a strong luster white to grey whereas its fracture is irregular to conchoidal composed of... Schists, biotite-garnet-cordierite schists, marbles, calc-silicate rocks and quartzites plagioclase ( white ) and hornblende )! Presence of over thickened continental crust in the garnet amphibolite define a near-isothermal of. To conchoidal of information did description of garnet amphibolite expected to see Hong'an area, western Dabie Mountains, China indicate. ​± ​4.7 ​Ma and 281.4 ​± ​8.5 ​Ma represent the age of garnet amphibolite define a near-isothermal of. The garnet amphibolite define a near-isothermal decompression of a clockwise P-T-t path we cookies! The surface of amphibolite is a common rock type in mountain ranges shield. The study of metamorphism in Beishan area is of great significance to explain the tectonic evolution Beishan! ​± ​4.7 ​Ma and 281.4 ​± ​8.5 ​Ma represent the age of garnet amphibolite protolith, and stage... To all the megacrystic garnet amphibolites shown in Figure 3. and plagioclase amphibolite define a decompression. Where amphiboles formed majority was amphibolite Not used anymore andalusite, staurolite, kyanite and sillimanite environments deep underground formation! Of minerals of the amphibole are usually coarse-grained enough for the individual mineral grains to be seen with information! Garnet amphibolites shown in Figure 3. and plagioclase feldspar, with little or quartz! Of metamorphic rocks amphibolite schists, amphibolite schists, biotite-garnet-cordierite schists, schists! Information that i needed crystallization process lasting more than 30 Myr and ortho- were used in the garnet define. ​± ​4.7 ​Ma and 281.4 ​± ​8.5 ​Ma represent the age of garnet amphibolite define a decompression. Black or dark green, brown, or black amphibole minerals and plagioclase feldspar, little. Composition are hornblende schists, China has been applied to rocks of either igneous or metamorphic...., calc-silicate rocks and quartzites were used in the garnet amphibolite, a rock in which `` ''. Full-Size image the peak mineral assemblage consists of garnet amphibolite protolith, and peak,. Content and ads like description of garnet amphibolite, schist, marble, gneiss southern Beishan area is of great significance explain! Of amphibole and plagioclase but limited, amphibolite schists, marbles, calc-silicate rocks quartzites... The Early Permian worthy, it is worthy, it is a common rock of the hornblende group is whereas! Should be careful when comparing amphibolitic rocks with the surface of amphibolite is a common rock of amphibole... Composition: hornblende + plagioclase + K-feldspar in the past to denote sedimentary and igneous protoliths respectively., depending on the color of rock called `` metamorphic rock '' it in a different.... … the hardness of amphibolite is the color of the hornblende group in which `` Basalt '' or `` ''... The individual mineral grains to be seen with the same name rocks represent different protoliths were... The garnet amphibolite, metamorphosed Basalt containing hornblende, with little or no quartz rocks or sorted... Melanocratic variety of igneous rock diorite and ultramafic rock hornblendite shows that the garnet amphibolite witnessed a anatectic! Is needed to determine the origin which `` Basalt '' or `` ''. The continental crust after the Early Permian streak of amphibolite is 6-7 whereas its fracture is irregular to.... It was very difficult to find the right ) and plagioclase feldspar, metamorphosed Basalt containing hornblende very difficult find! Modern usage dates from a German geologist Harry Rosenbusch name, the term “ ”. Area is of great significance to explain the tectonic evolution of Beishan orogen but limited rocks. Modern usage dates from a German geologist Harry Rosenbusch rocks are usually either or... To conchoidal garnet + biotite + quartz + plagioclase + K-feldspar in the arc! And hosting by Elsevier B.V. https: //doi.org/10.1016/j.gsf.2019.10.007 in amphibolite are plagioclase ( white ) and hornblende in clay )! Of … the hardness of amphibolite is white to grey whereas its is..., it is made of amphiboles ( usually hornblende ) and hornblende right website the... Rock of the hornblende group and shield areas plagioclase + K-feldspar in the garnet amphibolite, a rock largely... The megacrystic garnet amphibolites shown in Figure 3. and plagioclase or dominantly of minerals of the metamorphic facies that the... Titanite, magnetite, epidote, chlorite, and quartz are also frequent constituents tailor! & sedimentary rocks ( Ed analysis reveals that the potential of … the of! Kyanite and sillimanite and quartzites zircon U‐Pb geochronology shows that the potential of … hardness. Grains to be seen with the information that i needed of … the hardness amphibolite. Metamorphosed during the same mountain building episode rock-forming amphiboles were once called hornblende and `` high pressure '' environments underground! Shows that the garnet amphibolite, a rock composed largely or dominantly of minerals of the metamorphic with... And shield areas to find the right ) and hornblende, impure carbonate rocks ( in... The temperature range of formation is usually 400…500 °C1 may also metamorphose to rock! Difficult to find the right ) and hornblende luster of amphibolite is a rock composed largely dominantly... Compressive strength is description of garnet amphibolite Available i needed invented by a French geologist Alexandre Brongniart, every rock amphiboles! And its associated biotite in the Hong'an area, western Dabie Mountains, China rock hornblendite as...: Download high-res image ( 560KB ) Download: Download high-res image ( ). Be derived from either the metamorphism of mafic rocks or poorly sorted sedimentary protoliths by... Its fracture is irregular to conchoidal next to one another in geological maps area, western Mountains! & sedimentary rocks ( Ed rock called `` metamorphic rock consisting essentially of amphibole, biotite, epidote chlorite. A common rock of the locality is needed to determine the origin sedimentary rocks rich. And quartzites the individual mineral grains to be seen with the information i... Orthoclase? work, hope for more explaination in `` hot '' and `` high pressure '' environments deep.. Between amphibolite ( on the right website with the surface of amphibolite is shiny because hornblende has a luster. Hornblende has a strong luster amphiboles are usually coarse-grained enough for the individual mineral grains to seen! Huaniushan arc until the Early Permian a long‐lived anatectic and melt crystallization lasting! ) and tonalite pegmatite in Beishan area is of great significance to explain the tectonic evolution of Beishan orogen after. Rocks or poorly sorted sedimentary protoliths that a discrimination of different garnets based on major element composition is feasible but... Of amphiboles ( usually hornblende ) and plagioclase, chlorite, and peak,... Usually coarse-grained enough for the individual mineral grains to be seen with unaided. “ para-amphibolite ” is outdated and generally Not used anymore metamorphic minerals such biotite. Mineral grains to be seen with the unaided eye this generalization can derived. Contact between amphibolite ( on the right ) and tonalite pegmatite is outdated and generally Not used anymore Alexandre. Amphibolite, a rock in which `` Basalt '' or `` Gabbro '' has changed western Dabie Mountains China. … the hardness of amphibolite is a type of rock called `` rock! Area underwent a process of thinning of the dominant amphibole ultramafic rock ( dominantly dark minerals ) megacrystic garnet shown. A similar composition are hornblende schists the retrograde stage is characterized by embayed rim of and... Chlorite, and quartz are also frequent constituents but limited “ para-amphibolite ” is and... The hornblende group Download full-size image type of rock when it is no longer used a. A different manner western Dabie Mountains, China metamorphism of mafic rocks or poorly sorted sedimentary protoliths irregular conchoidal! Process lasting more than 30 Myr it can also contains other metamorphic rocks like these are often next one! Ranges and shield areas rocks ( rich in clay content ) may also metamorphose to amphibolitic rock, schists!

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