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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...the Malene supracrustals (see below). The Malene metasediments comprise quartz-garnetsilimanite rocks, |
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| hanging wall of the Monashee décollement (MD), quartz δI8O = 12.3 ± 0.5‰ (lσ S.D.) for metapelite (N...(N = 2), 12.6 ± 0.6‰ (N = 4) for < 1 m thick amphibolite layers, and 12.1 ± 0.4‰ (N = 24) for the concordant...for the leucogranite anatexis. A wide range in quartz δ18O from +8 to +16 within and below the MD suggests...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, |
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| diameter in sandy matrix. Pebbles and cobbles are quartz, locally derived metamorphic rocks, and hard fine-grained...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 |
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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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| 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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| 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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| 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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| nodules of probable stromatolitic origin in amphibolite from the Neoproterozoic terrain of southern Israel...bodies of massive to banded amphibolite occur within plagioclase-quartz-biotite hornblende gneiss at...at or close to its boundary with a quartz diorite pluton in the Neoproterozoic terrain of southern Israel...Israel. Entrapped within the amphibolite are nodules consisting mainly of calcite+talc, and rare banded...amphibolites is thus enigmatic. K EY WORDS : amphibolite, stromatolite, Neoproterozoic, Arabo-Nubian Shield |
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| of glass may turn out to be a gorgeous clump of quartz crystals, or vise versa. The story of Earth’s origin...will learn how the island formed. For now, let's see how it fits into the Georgia map. The two red lines...EPRIP island about 400 million years ago. You can see the Middleton-Lowndesville Fault breaks the Piedmont...take another look at the Georgia map on page 9, and see how it relates to this picture. The Middleton-Lowndesville...rocks. Frequently, light colored minerals like quartz and feldspar migrated into bands and swirls in |
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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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| Thorium and Rare-Earth Minerals in Powderhorn District, Gunnison County, Colorado By J. C. OLSON and...rocks_________-____-___-__-____--_-__-_________ Quartz-biotite schist and quartzite.___--____-_--_-____--_-_-_...porphyry.________-___----___--__.-___-___--__ Amphibolite. ___-_____________-_-__--____---_--_-___-____Granite...nite. ___________________-____--_-_-__..__._-_ Quartz veins-_------_------__------------------_-__------Rocks...PLATE 55. Generalized geologic map of Powderhorn district showing localities examined....____________________________ |
 | 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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| 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...southwest along its strike. The zone comprises grey, quartz-mica phyllites and schists, purple phyllites, marble |
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| thought to relate to a multiphase proliferation of quartz veins within shear zones and fracture systems rather...Basalt and dolerite Granitoids Main ore zone Quartz-carbonate veining, silicification; ankerite + biotite...fuchsite; Fe sulphides ± arsenopyrite, stibnite Quartz veining; intense silicification; biotite or sericite...NWSE folding Syntectonic tin granite emplacement Quartz, veins and vein swarms Mineralisation Both tin...inclusion studies indicate that the auriferous quartz veins were formed at higher temperatures and pressures |
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| Metapelitic migmatite gneiss, quartz-feldspathic gneiss, and amphibolite from the Bucaramanga Gneiss recorded...melting event affecting mostly SC RI pelitic and quartz-feldspathic lithologies with fluid present melting...reactions. The evaluation of mesosomes (amphibolite, pelitic and quartz-feldspathic rocks) as potential protoliths...occurrence of fluid-present melting reactions involving quartz and feldspar. The leucosomes produced by crystallization...Proterozoic - Cretaceous; these events include (see Spikings et al., 2016 for a CE review): i) Permian |
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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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| 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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| . . . . . .. 21 The transport distance of amphibolite at Palojärvi . . . . . . . . . . . . . . . ....materials, and also sampies have been taken from the outcrops for lithogeochemical investigation. Copper was...coarse-grained rocks. In composition they are trondhjemitic quartz diorites and granites or oligoclase granites (...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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| 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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| coincides with the westernmost sandstone and shale outcrops of the Chilhowee Group and Sandsuck Formation...especially pronounced deep red color, and rounded quartz pebbles and cobbles in discrete layers. These features...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...CENTRAL BLUE RIDGE, NORTH CAROLINA mapped as amphibolite contain interlayers of calc-silicate granofels |
 | Garde, Adam A., Scherstén, Anders, McDonald, Iain, Keulen, Nynke (2014) Comments and corrections to the Letter to the Editor,Meteoritics & Planetary Science, May 2014: “Impact controversies: Impact recognition criteria and related issues,” and discussion of shock mineral melting at Maniitsoq and Vredefort. Meteoritics & Planetary Science, 49 (12) 2129-2132 doi:10.1111/maps.12397 | Journal (article/letter/editorial) |
| is devoted to a discussion of shock lamellae in quartz, and the reader is given the impression that poorly...that was performed on suggestion by W.U. Reimold (see Garde et al. [2013] for details). It remains uncertain...deformation of quartz crystals will necessarily affect the planarity of their PDFs (see e.g., examples...ultimately proven by identification of PDFs in quartz and go on to argue that if an impact structure...the lower continental crust with ambient upper amphibolite to granulite facies P–T conditions. This is clearly |
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| employment, only the helpers are engaged from the district in question. The research assistant directs the...each end of the levelling tube, transport it and see to the orientation. - 1 helper acts as tripod mo... . Chlorite schist ...................... . Amphibolite ... ..... .. ... .. ... ..... . . Gneiss, depending...and electric conductivity are measured on the outcrops or diamond drill cores. A geologist working in...supplies information concerning the location of the outcrops, their rock types and tectonic data. Since the |
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| 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...(Andesine) (Labradorite) (Bytownite) (Anorthite) Quartz Cristobalite Opal Pollucite Nephelite Petalite... W. (1) . ACMITE - See PYROXENE ACTINOLITE - See AMPHIBOLE GROUP ADULARIA - See FELDSPAR GROUP (ORTHOCLASE) |
 | 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 |
 | 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) |
| desirable for the program committee to fish around and see if they can get invitations for the Society to hold...maintain a mineralogical museum in the Spruce Pine District”. Copies of the resolution were sent to Congressman...its members. The opportunity is always present to see old friends, make new friends, and discuss research...21 articles by 27 authors), 1982 (Kaolin Mining District of South Carolina with 8 articles by 10 authors)...related to the stratigraphy in the kaolin mining district, Geologic Investigations in the Blue Ridge of |
