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| detrital zircon dates (Whitehouse et al. 1997a, 2001) (see below). 4.1 Semipefites 4.1.1 Distribution Semipelites...separated by amphibolite sheets. The most prominent belt comprises the Flowerdale schist unit (see map) which...a northwesterly direction across the Gairloch district, but ending north of the mapped area, where the...basite (amphibolite) sheet. Narrower bands of Kerrysdale-type semipelite occur within the amphibolite in the...and less wellexposed outcrops compared with the adjoining rugged amphibolite outcrops, which tend to form |
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| (N = 2), 12.6 ± 0.6‰ (N = 4) for < 1 m thick amphibolite layers, and 12.1 ± 0.4‰ (N = 24) for the concordant...activity are active during detachment faulting (e.g., see Fig. 2; Reynolds and Lister, 1987): (1) a convective...interlayered metapelite, quartzofeldspathic gneiss, amphibolite, hornblende gneiss, pyroclastic carbonatite,...green- chist facies (450°C, 3.4 kbar) to upper amphibolite facies (650 to 680°C, 2.5 kbar) in an upward...8.0 6.5 3117 4 Granite 8.4 6.7 3118 4 Amphibolite 3.8 2.5 4.3 2.7 4.1 ? ? ?4 Metaconglomerate |
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| intermediate amphibolite............................................................... Coarse amphibolite.............................. Special textures in amphibolite................................................and to correlate their history with that of the district as a whole. Structural and petrographic evidence...pre-Cambrian sedimentary rocks are small masses of amphibolite. These bodies, both here and in other parts of...amphibolites was mapped by plane table, and individual amphibolite bodies were studied in detail in the Homestake |
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| where they are enclosed by the slightly younger Am~tsoq gneisses (Michard-Vitrac et al. 1977). Similar...complex (Fig. 1). These supracrustals form extensive outcrops up to several hundred meters wide and several...prominent is a banded amphibolite accounting for more than half of the amphibolite outcrops. The banded amphibolites...NOk gneiss .:.~ ~........:.~.. :.7 ~::::::::::::i Am]tsoq gneiss Isua supracrustal rocks w Scheelite...mineralizations found in the Malene supracrustals (see below). The Malene metasediments comprise quartz-garnetsilimanite |
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| nodules of probable stromatolitic origin in amphibolite from the Neoproterozoic terrain of southern Israel...ACT Several small bodies of massive to banded amphibolite occur within plagioclase-quartz-biotite hornblende...Israel. Entrapped within the amphibolite are nodules consisting mainly of calcite+talc, and rare banded marble...amphibolites is thus enigmatic. K EY WORDS : amphibolite, stromatolite, Neoproterozoic, Arabo-Nubian Shield...proposed. Geological setting The Neoproterozoic outcrops of southern Israel (totalling some 90 km2) occur |
 | Kapsiotis, Argyrios, Ewing Rassios, Anne, Grieco, Giovanni, Antonelou, Aspasia (2017) Genesis of Cr-bearing hydrogrossular-rich veins in a chromitite boulder from Ayios Stefanos, West Othris, Greece: A paradigm of micro-rodingites formation at the late stages of oceanic slab emplacement. Ore Geology Reviews, 90. 287-306 doi:10.1016/j.oregeorev.2017.06.006 | Journal (article/letter/editorial) |
| Agoriani mélange; Ferrière et al., 1988). Amphibolite outcrops near Lamia and Metalleion have been interpreted...serpentine accompanied by wollastonite, vesuvianite and calcite, and accessory non-silicate phases including Cr-spinel...with garnet. Garnet has been observed embedded in calcite in some veinlets (Fig. 6g). Chromian spinel fragments...birefringence, anisotropy) and spectroscopic data (see § "4.3 Confocal Raman spectroscopy") imply that these...Al2O3 (8.59-21.63 wt%) and MgO (24.82-33.47 wt%; see Table 5 in the supplementary files). The Cr2O3 concentration |
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| Mineralization North Carolina Robert Butler) District, 78 Southernmost at Four Gold Slate Belt Mine...Element Signature of Some Major Dahlonega District, Lumpkin County, Jc., and James R. Burnell, Jr...important ore controls. They have also served to see through the masking effects of superimposed metamorphism... of new not the been Ducktown previously district and described. the Hail information. serves...rifts/extensional * For a general review massive sulfide, see arcs of the various volcanic-associated Franklin |
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| ( 1 Cl Face or Form (012, wardite) (2134, calcite) (102, ferberite) (201, augelite) (1011, apatite)...rutilel (013, wulfenite) (0112, calcite) (111 sulfur) (1011, calcite) (120, triphylite) (210, ferberite)... OTHER p.c. personal communication Manuscript Ms AM American Museum of Natural History G H N,E.O,X...Hurlbut, Jr. (WIiey) . tor a more advanced treatm ent see: Elementary Crystallography, by M . J . Buereer (WIiey)...museums will be given in the mineral descriptions. See the section on Notations and Abbreviations for the |
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| indicates they were produced by greenschist to amphibolite facies dynamothermal metamorphism of alkalic...lavas rrTlJ sheeted dykes STUDIED METAMORPHIC OUTCROPS g bbros ultramafics v v TROODOS COMPLEX v...Cyprus locating the three studied metamorphic outcrops. 33030 ' I 275 width of ca. 1.5 km and is...alkali lavas of the Mamonia Complex. North of the amphibolite unit the fault contains serpentinite within which...grade are tectonically intermixed. Three small outcrops of amphibolites were sampled from southwest, west |
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| Thorium and Rare-Earth Minerals in Powderhorn District, Gunnison County, Colorado By J. C. OLSON and...porphyry.________-___----___--__.-___-___--__ Amphibolite. ___-_____________-_-__--____---_--_-___-____Granite...PLATE 55. Generalized geologic map of Powderhorn district showing localities examined....____________________________...map of Colorado, showing location of Powderhorn district, Gunnison County, Colo_-__-__--_-_-_----_-_--_...Deposits showing abnormal radioactivity, Powderhorn district 700 704 707 718 A CONTRIBUTION TO ECONOMIC |
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| dieng@geoladm.geol.queensu.ca (S. Dieng). 0301-9268/$ – see front matter © 2012 Elsevier B.V. All rights reserved...2000). The Group is metamorphosed from lowermost amphibolite to granulite facies to lower greenschist facies...matrix composed of hematite, quartz, chlorite, calcite, sericite, and pyrite (Fig. 4B). The leucocratic...northwest (Fig. 3). The hornblende-feldspar gneiss outcrops within the fault zone (Fig. 3). The rock is foliated...Kfs1 + Pl1 + Hbl1 (Fig. 4D), compatible with amphibolite facies metamorphism. Retrogression is indicated |
 | | Corporate Document |
| intense silicification; biotite or sericite + calcite, K-spar or albite; Fe sulphides ± arsenopyrite;...pyrite Calcite + chlorite + amphiboles + albite; minor pyrite Sericite ± K-spar ± albite; calcite + sphene...sphene ± tourmaline; minor pyrite Sericite + calcite, generally restricted The large volumes of chlorite-rich...Tshanda and Mero deposits. Several mineralised outcrops were also observed, providing limited first hand...north east of the Democratic Republic of Congo (see Figures1.2 and 1.3). The concession is approximately |
 | Crane, A., Goodman, S., Krabbendam, M., Leslie, A. G., Paterson, I. B., Robertson, S., Rollin, K. (2002) Geology of the Glen Shee district - Memoir for 1:50 000 Geological Sheet 56W together with adjacent parts of Sheets 55E, 65W and 64E (Scotland) British Geological Survey, London. | Book |
| of the Glen Shee district Table I Geological sequence in the Gle n Shee district. QUATERNARY Landslip...Granite Geology of the Glen Shee district The Glen Shee district straddles the boundary between the...regional inversion of the Dalradian rocks of the district. Major slides developed on the limbs of large-scale...meta1norphic minerals, whereas in the north of the district kyanite developed in rocks of suitable composition...Highland Boundary Fault, which in the Glen Shee district occurs entirely within Silurian to Devonian Old |
 | Jahn, B.M., Auvray, B., Cornichet, J., Bai, Y.L., Shen, Q.H., Liu, D.Y. (1987) 3.5 Ga old amphibolites from eastern Hebei Province, China: Field occurrence, petrography, Sm-Nd isochron age and REE geochemistry. Precambrian Research, 34 (3) 311-346 doi:10.1016/0301-9268(87)90006-4 | Journal (article/letter/editorial) |
| geochemistry. Precambrian Res., 34: 311--346. Amphibolite blocks frequently occur in association with grey...were subsequently retrogressed to the present amphibolite facies mineral assemblages. The positive end...represented by highly metamorphosed and deformed amphibolite enclaves in late Archaean granitic rocks. The...ancient age for the contrasting rock types: amphibolite and quartz diorite. These points will be discussed...(granulite and upper amphibolite facies), and less than 10% belongs to lower grade amphibolite and greenschist |
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| of the sillimanite-almandite subfacies of the amphibolite facies and lies within the sillimanite zone....SCOTFORD-METAMORPHISM AND AXIAL-PLANE FOLDING, N. Y. Amphibolite Inwood marble Poundridge granite Siscowit granite...Index map 2. Sillimanite-almandite subfacies of amphibolite fades 3. Cation variation 4. Stereographic projection...Fordham migmatite gneiss 10. Measured modes of the amphibolite 11. Estimated modes of the Inwood marble. .....Bedford augen gneiss and the Bedford pegmatite district. Bell (1936) investigated the petrography of the |
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| metamorphism increased progressivelyto upper amphibolite and even granulite facies. Yioolsdrif Suite and...Metamorphic Complexes consist ofmidProterozoic, upper amphibolite facies ortho- and paragneisses. metasediments...1986. The Gamsberg zinc deposits, Namaqualand District. /11:Anhaeusser, C.R. and Maske, 299 pp. S., (Eds)...Spee. publn. geol. Soc. S. Afr .. Johannesburg. District. /11:Anhaeusser, C.R. and Maske, S .. (Eds), 1761-1788...paragneiss containing quartzite, mica schist and amphibolite layers are the main rock types that make up the |
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| Malaysia and Singapore. Johore, Dr. D. J. Gobbett (see under Professor F. Kenneth G. as at he was...Mines, Cornwall, England. Dr. C. §. Hutchison Dr. (see under editors) Clive Roderick Jones, B.Sc., Ph.D...Conditions of Metamorphism, Structure, 290 Amphibolite, Geochemistry, Petrology, Pelitic Rocks, ...map of the Kenny Hill formation, Upper Paleozoic outcrops in Southeast Asia, Geosynclinal organization...Stratigraphic sections in the Tembeling formation, waa am Gin bey 1.1 Limestone bedrock near Batu Gajah, |
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| The Swakop Terrane was metamorphosed to upper amphibolite-facies conditions with anatexis in the Uitdraai...dolomite is white in color with medium, equigranular calcite and dolomite grains. Tremolite needles are rarely...edge of the Okawakuejawa Ridge, the Omusema amphibolite separates the Quelle from the Kudulecke unit...unit. In this locality, the lower part of this amphibolite is interlayered with the upper beds of the Quelle...small lens of Quelle rocks separates the Omusema amphibolite from the Etusis meta-arkose. This complex stratigraphic |
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| nappes reached middle crustal levels (in the amphibolite facies field), strain partitioned into structurally...structure comprising separate autonomous units (see Fiala et al. in Dallmeyer et al. 1995, Fiala and...palaeobiogeographic reconstructions, or deep reflection profiles (see e. g. Franke 1989, Oncken 1988, Vollbrecht et al...corresponding CA (calc-alkaline) volcanic belts (see Matte 1986, Matte et al. 1990, Franke 1989, Neugebauer...Moldanubian Zone including the units at its periphery (see discussions in Tollmann 1982, Matte 1986, Matte et |
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| that has caved from the working. The waste rock, outcrops in the ends of the larger trenches, and pillars...area in the core of the amphibolite mass north of Samrah, Here the outcrops consist of large boulders...boulders was mapped in the nearby, circular mass of amphibolite straddling the dacite-andesite dike swarm east...of gabbro occur sporadically throughout the amphibolite. Northwest and north of the map, gabbro is common...by Quinn in 1964. The gabbro characteristically outcrops in the form of large nearly spherical boulders |
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| Eastern Palmer Land Shear Zone. Based on the high-amphibolite grade rocks exposed in central western Palmer...(EPLSZ) (for geographical position of Palmer Land, see inset in Fig. 1). Geochemical data suggest tectonic... Methods and sample description 3.a. Mapping Outcrops containing metamorphic rocks in several previously...containing quartz + muscovite + plagioclase ± garnet ± calcite; the fine-grained metapelites (no optical analyses...−65.47 Orthogneiss E 1661.5 −69.28 −64.63 Amphibolite E 3607.2 Grimley Glacier Mt Sullivan −69.57 |
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| Acknowledgements I am extremely grateful to Robert Hall for considerable assistance during the preparation...discussion with Christopher Morley and Robert Tate. I am also extremely grateful to Timothy for frequently...me when there were problems with the programmes. I am grateful to the following organizations for permission...remained unknown until much later. The extensive outcrops of phyllite and slate were already well known...term, for the region, although it does contain outcrops of Carboniferous-Permian basement rocks, is dominated |
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| ................... A8 Photograph of banded amphibolite of member OCra of the Rowe Schist....................................... A17 Photograph of amphibolite in member A of the Cobble Mountain Formation............ A25 24. Photograph of F x fold in amphibolite of the Rowe Schist ............................lenticular masses of green schist, gray schist, amphibolite, and serpentinized ultramafic rock. Intercalation...Cobble Mountain Formation. Plagioclase gneiss and amphibolite of the pre-Silurian Collinsville Formation core |
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| central East Greenland sedimentary rocks sees see evade G. Henderson, of West On Manu ode Caicos...and C. H. Emeleus neers vate ween oce anes Scena, see yee eAN attest Lae renee 248 CALEDONIAN FOLD BELT...Archaean gneisses. The gneisses are mostly in amphibolite facies though granulite facies gneisses occur...Archaean are known semblages, mainly in high amphibolite gneisses is thought and horn- to be due ...Middle quartzites Quartzite, gypsum. to Late outcrops in sandstone Outside and conglomerate the |
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| polymetamorphic mineral assemblages, mainly in high amphibolite and hornblende granulite facies, are characteristic...Archaean gneisses. The gneisses are mostly in amphibolite facies though granulite facies gneisses occur...remobilised basement gneisses under upper greenschist-amphibolite facies conditions during the formation of the...to Late Proterozoic sandstones and quartzites outcrops in a narrow belt across North Greenland from Inglefield...Godthabsfjord, located of gneiss and on fig. 60. amphibolite Copyright north Geodetic Institute, Denmark |
