 | | Report (issue) | | Pegmatite Investigations 1942-45 New England By EUGENE N. CAMERON and OTHERS GEOLOGICAL SURVEY PROFESSIONAL..._______ _ Geology of the pegmatite districts of New Hampshire_ Rock units ________________________________...quality __ AnalyHis of the wartime mica industry of New England ________________________________________...Androscoggin County ______________________ _ Berry feldspar quarry __________________ _ Cumberland County ___...LaChance mines _______________________ _ Oxford County ____________________________ _ Barrett beryl prospect |  | | Journal (article/letter/editorial) | | localities, and authars mentioned in the 26th List of new mineral names (p. 954) are not included in this index...216; Rockall, opt., cell-dimensions, 216. Adularia, New Zealand, hydrothermal, anal., opt., genesis, 916...AKHTER (S. M.), see QAISER(M. A.), 735. Alaer6n mine, Copiap6, Chile, arsenolamprite, 732. Ala di Stura...dickite or both, i28. Amblygonite, France, Maine, New South Wales, Saxony, anal., cell-dimensions, distinction...montebrasite, 4r4. Amblygonite mine, Caceres, Spain, montebrasite, 414. Amelia County, Virginia, albite, I56; |  | | Field Trip Notes | | //' . GUIDEBOOK FOR FIELD IN ''fy,.'t:J TRIPS NEW ENGLAND NOVEMBER 10-12, 1952 Organized by the...Before visiting any of the sites described in the New England Intercollegiate Geological Conference guidebooks...Highlands of East-Central New York, Southern Vermont, and Southern New Hampshire Field Trip No. 2, Outstanding...Outstanding pegmatites of Maine and New Hampshire 73 Geology of the "Chelmsford Granite" 103 Field Trip...OF EAST-CENTRAL NEW YORK, SOUTHER Leaders: VERJ-IONT, AND SOUTHERN NEW HAMPSHIRE Marland P, Billings |  | | Journal (article/letter/editorial) | | quartz. A variety of syenites occur and consist of perthite (+ atbite + orthoclase),ferro-edenite,annite,...to alkalic igneous complexes that occur in New Hampshire, southern Maine, and Vermont (Billings, 1928...Hills in the St. Lawrence Lowlands of Quebec and the New England SeamountChain. (Eby, I 985; Gold, I 967;...and age for the White Mountain, Monteregian, and New England Seamount intrusions (Foland and Falul, 1977;...subhedral granular medium-grained aggregatesof perthite, hornblende, and biotite. Minor constituents include |  | CORNELL, D, HUMPHREYS, H, THEART, H, SCHEEPERS, D (1992) A collision-related pressure-temperature-time path for Prieska copper mine, namaqua-natal tectonic province, South Africa. Precambrian Research, 59 (1) 43-71 doi:10.1016/0301-9268(92)90051-o | Journal (article/letter/editorial) | | pressure-temperature-time path for Prieska Copper Mine, Namaqua-Natal tectonic Province, South Africa D...pressure-temperature-time path for Prieska Copper Mine, Namaqua-Natal tectonic Province, South Africa.... Precambrian Res., 59:43-71. Prieska Copper Mine lies in highly metamorphosed gneisses of the 1100 Ma...geochronology to develop a model PTt path for the Prieska Mine region. The model envisages an orogenic cycle at...and 0.05 mm/yr uplift rate envisaged for Prieska Mine are long and slow compared with Phanerozoic examples |  | | Book | | detail those already known. In recent years many new occurrences of alkaline rocks and carbonatites have...that have led to the discovery of many impo1Ā·tant new localities. The present volume is likely to be of...be a considerable source of data, particularly of new occurrences, but a re generally unsatisfactory because...rocks n11d t!te dept!ts of the Enrt/1 . McGraw-Hill, New York. 598 pp. DAWSON, J . B . Ā· t 980. Ki111/Jerlites...Verlag, Berlin. 252 pp. DEANS, T. 1966. Economic mine ralogy of African carbonatites. 111 O . F. Tuttle |  | Wu, Jia-Lin, Zhang, Hua-Feng, Zhai, Ming-Guo, Guo, Jing-Hui, Liu, Liang, Yang, Wen-Qiang, Wang, Hao-Zheng, Zhao, Lei, Jia, Xiao-Liang, Wang, Wei (2016) Discovery of pelitic high-pressure granulite from Manjinggou of the Huaiāan Complex, North China Craton: Metamorphic PāT evolution and geological implications. Precambrian Research, 278. 323-336 doi:10.1016/j.precamres.2016.03.001 | Journal (article/letter/editorial) | | outcrop is about 50 km away to southeast of Huaiāan county, and consists of six lithological units: the Shuigoukou...show corroded morphology, and are surrounded by perthite, quartz, locally by secondary biotite, muscovite...minor grains occurring as irregular patches within perthite (Fig. 3q). The less amounts of plagioclase might...include two types of variants: perthite and microline (Fig. 3m, p, q). The perthite grains including some small...plagioclase grains, displaying irregular patches within perthite (Fig. 3q), exhibit relatively large variation |  | | Journal (article/letter/editorial) | | in the Precambrian Complex of Gold Butte, Clark County, Nevada A VOLBORTH Geological Society of America...org/cgi/alerts to receive free e-mail alerts when new articles cite this article Subscribe click www...in the Precambrian Complex of Gold Butte, Clark County, Nevada Abstract: The Precambrian complex of the...about 25 by 35 km and consists of gray porphyntic perthite-quartz-biotite granites and quartz monzonites...first in this granite. The main constituents are perthite, quartz, oligoclase-andesme, albite, and biotite |  | FRANÄK, J., SCHULMANN, K., LEXA, O., ULRICH, S., Å TĆPSKĆ, P., HALODA, J., TĆCOVĆ, P. (2011) Origin of felsic granulite microstructure by heterogeneous decomposition of alkali feldspar and extreme weakening of orogenic lower crust during the Variscan orogeny. Journal of Metamorphic Geology, 29 (1) 103-130 doi:10.1111/j.1525-1314.2010.00911.x | Journal (article/letter/editorial) | | preservation of lattice orientation of the parental perthite crystals are all explained by a discontinuous...may favour the diffusion creep or GBS according to new results of Schulmann et al. (2008) and ZaĢvada et...850 C (OĆBrien & RoĢtzler, 2003; SĢtıĢpskaĢ & Powell, 2005), where the available ļ¬uid is represented...a maximum of 850 C ā 1.6ā1.8 GPa (SĢtıĢpskaĢ & Powell, 2005) or TWEEQU yielding 970ā1000 C ā 1.6ā1.7...0.5ā0.8 GPa (KroĢner et al., 2000; SĢtıĢpskaĢ & Powell, 2005; Verner et al., 2007). 2010 Blackwell Publishing |  | | Journal (article/letter/editorial) | | localities, and authors mentioned in the 29th List of new mineral names are not ineluded in this Index ABEDINr...biotite, 453 Alkali feldspar solvus, 59 Allanite, New South Wales, anal., opt., 652; metamict, .4remtal...infra-red spectra, I97 Aorangi gold mine, Nelson, South Island, New Zeaiatul, cymrite, 31 I Apatite, Greenland...julgoldite, 76I Avondale, Auckland, New Zealand, pseudometeorite, 529 Awaruite, New Zealand, anal., opt., X-ray...), see KASHKAI(M.-A.), 5OI Back Creek, Pambula, New South Wales, cookcite, diaspore, pyrophyllite, 765 |  | | Report (issue) | | Eagle Mountain Mineā geology of the former Kaiser Steel operation in Riverside County, California By...eastern and central parts of the Eagle Mountain mine area on topographic base..........................investigation of the Eagle Mountain Mine area, though cursory, revealed new structural, alteration, and stratigraphic...Eagle Mountain Mine of southeastern California (fig. 1) was by far the largest iron mine of the western...1992). Kaiser built its own 52-mile railroad to the mine and operated 100-car trains. From 1965 onward it |  | | Journal (article/letter/editorial) | | the albite facies: replacement of preexisting perthite by albite, late precipitations of aegirine and...those of Nigeria (Jacobson et al., 1958) or with New ttampshire (Billings, 1956). The general characteristics...proposed, all ages have been recalculated using the new decay constant: 2 = 1.42- 10 11 yr. 1 (Steigeret...5Myr and an initial ratio of 0.7073+0.0022. The perthite feldspar--whole rock isochron of the hypersolvus...Quin (1969) and Parfenoff et al. (1973) a Quartz Perthite K-phase Na-phase Microcline Albite Riebeckite |  | | Journal (article/letter/editorial) | | the surrounding matrix material. For kyanite in perthite, a thermodynamic analysis reveals that the kyanite...became metastable at the interface with the host perthite at the peak metamorphic pressure, and therefore...Plagioclase rims around kyanite inclusions within large perthite have a radial thickness of up to 50 lm. In contrast...same crystallographic orientation as the host perthite. The difference in rim thickness for the two microstructural...inclusion within host perthite. (b) Compositional proļ¬le across garnet enclosed in perthite. (c) BSE image of |  | | Report (chapter) | | geochemical and isotopic studies. We also present new data concerning the pressure-temperature conditions...Qz-plag-kspar-bi_+ opx Qianan Area Qz-plag-bi-hb-cpx-perthite Qz-perthite-plag-bi Qz-plag-bi-antiperthite Qz-plag-bi-gt...Qz-plag-bi-gt ā¢ opx Qz-plag-bi-opx-perthite Qz-plag-gt-cord-bi-sill Qz-plag-kspar-bi-gt _+sill Opx-gt-qz-magt...1983). Garnet-hornblende temperatures (Graham & Powell 1984) are in the same range, 690-730~ but garnet-orthopyroxene...are heterogeneous and have had a complex history. New radiometric data suggest that the southern area between |  | | Journal (article/letter/editorial) | | melting and melt-solid interaction in the lower crust: new evidence from UHT granulites of Eastern Ghats Belt...from the sparse occurrence of quartz plagioclase perthite leucosome layers in the migmatitic aluminous granulites...dispersal and eventual loss of melt (White and Powell, 2002). Therefore, rocks have limited access for...and spinel, while the leucosome contains quartz, perthite and plagioclase in variable proportions. In major...portions of the leucosomes, quartz (with either perthite or plagioclase) is separated from sapphirine and |  | | Journal (article/letter/editorial) | | Sciences, Stanford University, Stanford, CA 94305-2115, USA 3 Beijing SHRIMP Center, Beijing 100037, China ABSTRACT...granulites are garnet + quartz + ternary feldspar (now perthite) rocks containing kyanite, plagioclase, biotite...been garnet + kyanite + ternary feldspar (now perthite) + quartz, together with accessory rutile, apatite...high-strain ductile deformation (Fig. 4a). Rounded perthite grains commonly occur in garnet (Fig. 4b). Garnet...porphyroblasts with inclusions of kyanite, rutile, quartz, perthite and minor zircon and apatite (zircon is enclosed |  | | Journal (article/letter/editorial) | | Smithsonian Institution March-April: Wulfenite, Red Cloud mine, Arizona; photo by Jeffrey Scovil May-June: Calcite...Crystallized gold on quartz, Colorado Quartz mine, Mariposa County, California. Ā© Harold and Erica Van Pelt...342 Apatite, 33, 58, 75, 220 Arizona's Red Cloud Mine: A 1985 Report, R. W. Grant, 54 Arsenopyrite, 75...Averett, W. R . , Dinosaur Valley, ColoĀ rado's New Paleontological Museum, Grand Junction, Colorado...Andesine Anorthosite Body Near Montpelier, Hanover County, Virginia, 57 Bowenite, 251, 266, 288 Britholite |  | | Report (volume) | | the Beecher No. 3-Black Diamond Pegmatite Custer County South Dakota GEOLOGICAL SURVEY BULLETIN 1072-1...the Beecher No. 3-Black Diamond Pegmatite Custer County South Dakota By JACK A. REDDEN CONTRIBUTIONS TO...THE BEECHER NO. 3-BLACK DIAMOND PEGMATITE, CUSTER COUNTY, SOUTH DAKOTA By JACK A. EEDDEN ABSTRACT The Beecher...quartzalbite-muscovite-perthite-beryl pegmatite, (4) perthite-quartz-albite pegmatite, (5) perthite-quartz pegmatite...claim, about 4y2 miles south of Custer, Custer County, S. Dak. (fig. 21). This is in an area known for |  | | Report (issue) | | pegmatite in granite, Short Tom Smith mine, Rockingham County, N. C______ ____ ____________________ ...between pegmatite and granite, E. R. Self mine, Gaston County, N. C____________________ 6. Sinuous discordant...wall, Knight mine, Rockingham County, N. C- ~ -7. Sharp hanging-wall contact, Knight mine ______ _______________...of granite underlain by schist, Hawkins mine, Stokes County, N. C _ _ _ _ _ _ __ _ _ __ _ _ _ _ _ 9....and other units in the Big Bess pegmatite, Gaston County, N. C _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ |  | | Journal (article/letter/editorial) | | the Khondalite belt. The presence of abundant perthite/mesoperthite in these rocks reflects post-peak...and Dongpo, and reveal similar conditions in the new localities reported here, suggesting that UHT metamorphism...(UHT) metamorphism, two-feldspar geothermometer, perthite/ mesoperthite, Paleoproterozoic, Khondalite belt...assemblages. In this context, ternary feldspars (perthite, Per) provide a robust alternative, as they are...leucosomes. The Grt-Sil-Spr granulites have 10ā15% perthite and 5ā10% plagioclase; all minerals are listed |  | Shimizu, Hisako, Tsunogae, Toshiaki, Santosh, M., Liu, S. J., Li, J. H. (2013) Phase equilibrium modelling of Palaeoproterozoic ultrahigh-temperature sapphirine granulite from the Inner Mongolia Suture Zone, North China Craton: implications for counterclockwiseP-Tpath. Geological Journal, 48 (5) 456-466 doi:10.1002/gj.2504 | Journal (article/letter/editorial) | | Peking University, Beijing 100871, China We report new petrological data on the sapphirine granulite from...Suture Zone (Santosh, 2010). In this study, we report new mineralogical and petrological data on sapphirine...KFMASHTO, and NCKFMASHTO systems (Taylor-Jones and Powell, 2010; Korhonen et al., 2012; Shimizu et al., 2012)...quartzofeldspathic layer is composed mainly of quartz (40ā50%), perthite (30ā40%), and garnet (10ā15%) with minor biotite...coarse-grained quartz and perthite is present as a matrix phase. Perthite is in places mantled by ļ¬ne-grained |  | | Journal (article/letter/editorial) | | metapelites (garnet + sillimanite + K feldspar (perthite) + graphite Ā± plagioclase + quartz Ā± melt), maļ¬c...metapelitic granulites contain restitic sillimanite + perthite Ā± garnet assemblage interspersed with melt represented...area calculation of host and exsolution. The two perthite grains represent the variability of proportion...76 5.005 95.65 3.54 0.81 2.017 2.002 Fe* Perthite Ab An Or Plagioclase Ilmenite Rutile N.C...Green (1979), G: Ganguly (1979), D: Dahl (1980), P: Powell (1985), K: Krogh (1988), PTN: Pattison and Newton |  | | Journal (article/letter/editorial) | | Los Angeles, CA 90095, USA New Mexico Bureau of Geology and Mineral Resources, New Mexico Tech, Socorro...Socorro, NM 87801, USA a r t i c l e i n f o Article history: Accepted 21 September 2010 Available online...(1988) surmised that the turbid regions of patch perthite had lost 40Ar* via micropores that formed during...dating ā that provides a test of this hypothesis. Our new T.M. Harrison et al. / Earth and Planetary Science...began to exsolve into braid cryptoperthite (Br) perthite as the hypabyssal pluton cooled (within ca. 104ā105) |  | | Report (issue) | | quadrangle, the mapping was by Norton (1976) and Powell and others (1973). Reports thus far published on...caused largely by concentrations of coarse graphic perthite in lenses a fraction of a meter to several meters...dikes. The segregations are mainly coarse-grained perthite-rich bodies, generally lenticular or pod-shaped...granite. Others range from plagioclase-perthite-quartz through perthite-quartz to monomineralic quartz fracture...consisting predominantly of albite, quartz, and perthite. Though numerous, their size is so small that |  | | Journal (article/letter/editorial) | | lithological and geochemical descriptions and a new tectonostratigraphy summarized in Boyd et al. (2010)...Kfs + Bt + Qz + Spl + Mag + Ilm Metapelite Crd + perthite + Bt + Qz Heterogranular; early-stage coarse...after Whitney & Evans, 2010). K-feldspar occurs as perthite, but often shows Downloaded from https:/www.cambridge...Mafic/ intermediate granulite Grt + Cpx + Pl + Kfs/perthite + Bt + Qz + Mag + Ilm Grt + Bt TBM056 31840...31840 201119 8655724 37 Orthogneiss Qz + Pl + perthite + Cpx I + Bt + Opq Grt + Bt + Cpx IH52 35220 |
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