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| 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...folding and have been metamorphosed up to the amphibolite facies (Chadwick and Coe 1983). Isotopic evidence...indicating that tourmaline formed prior to the amphibolite-facies metamorphism (Appel 1985 b). The tourmaline...separated from each other by 5-10 m of banded amphibolite with very sparsely disseminated scheelite. The |
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| within the Bohemian Massif. These units mostly show lower metamorphic grade and different P-T histories. The...higher contents of K2O, P2O5, La, Ce, Cr, Ni and lower contents of CaO and N2O. Unlike the above mentioned...levels (in the amphibolite facies field), strain partitioned into structurally lower unit (Micaschist...Laurussia (Baltica) collision in the Devonian to Lower Carboniferous. Variscan convergence, culminated...units (in Saxothuringicum and Moldanubicum): 8. lower part of allochthonous units consisting of weakly |
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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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| control stations . . . . .. Control station loops land II . . . . . . . . . . . . . . . . . . . . . . ...summer measured new triangulation stations of the lower order. The Geological Survey received the coordinates...Comm. geol. Finlande N:o 233 Diagonal lines marked Land Kare tied to triangulation stations 2, 3, 4 and...employment, only the helpers are engaged from the district in question. The research assistant directs the... At the lower end of the map sheet a point is chosen, which can be, for instance, the lower west corner |
 | | Book |
| Maps screen shot) on page 9, mark the upper and lower boundaries of our ancient island which we will call...roughly southwest through Dahlonega and Canton. The lower red line marks another important fault called the...you hit the Middleton-Lowndesville Fault, EBRIP's lower limit. Incidentally, rocks of the Carolina Terrane...arranged in longitudinal stripes or bands across the land, with a different rock type in each band. The bands...pushed up on top of the Snowbird sediments. The lower red line shows the Greenbrier Fault that marks this |
 | | Report (issue) |
| amphibolitized 38 olivine gabbro 22. Photomicrograph of amphibolite . 39 23. Photograph of a diallage-plagioclase...olivine gabbro show a progressive alteration into amphibolite which consists of an assemblage of hornblend...occurs locally within the sill. Evidence that the amphibolite margin, previously termed Roan Gneiss, is orthoamphibolite...of Keith (1907) shows associated ultramafic-amphibolite bodies within a thick interlayered sequence of...likely that many of the attitudes measured at small outcrops represent some of the smaller minor folds. The |
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| several distinct NW-trending belts separated by amphibolite sheets. The most prominent belt comprises the...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...the plagioclase and mica content correspondingly lower. Typical samples contain Table 4.1. Lithotectonic |
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| rock forming dikes as much as 10 feet thick. Outcrops rare. Mapped largely from float PEGMATITE coarse-grained...thin slabs. Breaks Commonly makes prominent outcrops and relatively thin sandy residual soils. Locally...Locally contains abundant lenses and layers of amphibolite and hornblende gneiss similar to those described...exposed over areas greater than a few acres AMPHIBOLITE, HORNBLENDE GNEISS, AND ASSOCIATED ROCKS Predominantly...fine- to medium-grained dark-green to black amphibolite and medium- to dark-gray-green hornblende gneiss |
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| coincides with the westernmost sandstone and shale outcrops of the Chilhowee Group and Sandsuck Formation...Asheville Basin, and the Waynesville- Canton Basin. Lower, much more subdued landscapes characterize intermontane...that of the field mapper. We have recorded many outcrops on our field sheets while making cross-country...oversimplification to relate isolated or selected outcrops of mylonite in these basement rocks to single...virtually unmetamorphosed sandstones and shales of the Lower Cambrian Chilhowee Group along the northwest margin |
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| compared to the eastern domain along the Eastern Palmer Land Shear Zone (EPLSZ) of the Antarctic Peninsula. The...between Alexander Island (the Western Domain), Palmer Land (Central Domain) and the Gondwana margin (the Eastern...Palmer Land, (2) the exhumation and shearing of low to medium pressure rocks in western Palmer Land and...and along the Eastern Palmer Land Shear Zone, and (3) shallow burial and subsequent exhumation of sediments...margin along the Eastern Palmer Land Shear Zone. Based on the high-amphibolite grade rocks exposed in central |
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| features with coherent drainage only from their lower-most slopes and on surrounding pediments. In the...that has caved from the working. The waste rock, outcrops in the ends of the larger trenches, and pillars...1 where seen since they provide excellent local land marks. Geology Figure 2 is a geologic map of Samrah...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 |
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| . . . . . .. 21 The transport distance of amphibolite at Palojärvi . . . . . . . . . . . . . . . ....(e.g. as malachite) and is thus enriched in the lower parts of the weathering zone. In this cementation...materials, and also sampies have been taken from the outcrops for lithogeochemical investigation. Copper was...the basement complex is the Presvecokarelidic amphibolite formation. It includes voleanogenic amphibolites...partly from acid lavas (Nykänen 1971 b). The amphibolite formation is heterogeneous and the rock types |
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| indicates they were produced by greenschist to amphibolite facies dynamothermal metamorphism of alkalic...p r i s e s a. p r e d o m i n a n t l y mafic lower unit a n d an u p p e r m o s t l y allocht h o...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 |
 | 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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| 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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| the magmatic character and tectonic setting of amphibolite-facies basic rocks, in which former textures...pre-metamorphic magmatic characters of amphibolite bodies subjected to amphibolite-facies metamorphism may be determined...Division in the type area is almost devoid of amphibolite bodies. Further north, in northern Ross-shire...concordant bodies of garnet amphibolite, known locally as Sgurr Mor amphibolite, occur sporadically (Winchester...to consist of a series rather than a single amphibolite body. 51 At most of the collecting traverses |
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| including pelitic schist and minor garnet-bearing amphibolite, which are faulted against a sequence of low-grade...high-pressure epidote amphibolite facies is recorded by medium-grade schist and amphibolite and was synchronous...mica-schist, quartzite, and minor garnet-bearing amphibolite outcrops between Red Point [442500E, 5178500N; GDA94...of peak metamorphic minerals including garnet (lower left). (g) S2 and S3 in low-grade phyllite. (h)...a typical mineral assemblage in medium-grade amphibolite, note the brighter oligoclase zones surrounding |
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| The Swakop Terrane was metamorphosed to upper amphibolite-facies conditions with anatexis in the Uitdraai...marble as it forms the core of the dome with the lower contact not exposed. The Quelle Formation comprises...Omusema amphibolite separates the Quelle from the Kudulecke unit. In this locality, the lower part of...of this amphibolite is interlayered with the upper beds of the Quelle Formation (Figure 6). Against the...small lens of Quelle rocks separates the Omusema amphibolite from the Etusis meta-arkose. This complex stratigraphic |
 | Garihan, John M., Ranson, William A., Muthukrishnan, Suresh, Bridgeman, James L., Goforth, Tom (2012) Geologic Studies of the Inner Piedmont, Brevarrd Zone, and Blue RIdge, South Carolina and North Carolina. Field Trip Guidebook. Carolina Geological Society | Report (issue) |
| maintain a mineralogical museum in the Spruce Pine District”. Copies of the resolution were sent to Congressman...21 articles by 27 authors), 1982 (Kaolin Mining District of South Carolina with 8 articles by 10 authors)...Geology of the Piedmont and Coastal Plain near Page- land, SC and Wadesboro, NC Geology of the Blue Ridge...related to the stratigraphy in the kaolin mining district, Geologic Investigations in the Blue Ridge of...1-2 Little Switzerland, NC Spruce Pine Mining District, North Carolina Alex Glover and Kenneth Taylor |
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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...terrain of southern Israel. Entrapped within the amphibolite are nodules consisting mainly of calcite+talc...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 |
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| represents a fragment of a single North Atlantic land mass. The largest part of the ice-free area is made...structural divisions of Greenland the neighbouring land areas. in relation to Along the west coast of...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 |
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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...being that those rocks are overall 0.5 to 1.5‰ lower in δ18O than in the middle crust at Thor-Odin. These...driven by the weakening of the mid dle and/or lower crust by anatexis (Patiño Douce et al., 1990; Hollister...1993) and/or injection of basal tic magma into the lower crust (Gans, 1987; Grunder and Wickham, 1991). It...This basement terrane is comprised of ~2200 Ma, Lower Proterozoic paragneiss together with multiple intrusive |
 | Dlamini, N., Hofmann, A., Belyanin, G., Xie, H., Kröner, A., Wilson, A., Slabunov, A. (2017) Supracrustal gneisses in southern Swaziland: a basalt-sandstone assemblage of the upper Mozaan Group deformed in the Neoarchaean. South African Journal of Geology, 120 (4) 477-498 doi:10.25131/gssajg.120.4.477 | Journal (article/letter/editorial) |
| assemblage of ductilely deformed supracrustal rocks (amphibolite and quartzite) and granitoid gneisses intruded...three deformational events (D1, D2 and D3) at amphibolite and retrograde greenschist facies grade. The..., 2013; Wilson et al., 2013). It consists of a lower volcano-sedimentary unit known as the Nsuze Group...Nsuze Group, suggesting that the deposition of the lower Nsuze Group occurred at around 3.0 Ga (Hegner et...South Africa, 1988) as greenstone remnants (amphibolite, talc-carbonate schist and serpentinebearing |
| | Book |
| Greenland represents a fragment single North Atlantic land mass. with of a The largest part of the ice-free...1. The structural divisions the neighbouring land areas. of Greenland in relation to Along the...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 ...major mid-Palaeozoic fold belts occur in Green- land: the Caledonian fold belt of East and North-East |
 | 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...thick developments of graphitic schist occur in the lower and middle parts of the succession. In overall terms...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 |
