 | | Journal (article/letter/editorial) | | high-temperature metamorphism A . KALT,' B. G R A U E R T 2 A N D A . B A U M A N N ' 'Minerlogisch-Petrographisches...particular is still not very well constrained and is a matter of discussion. Recent papers on migmatites...material (Patiiio Douce & Johnston, 1991; Skjerlie et a l . , 1993). Studies on natural migmatites (Sawyer...fluids and melts. These implications 667 668 A . KALT FT A L . are often not considered when dating migmatites...Massif Central L./ { ALPS .A: Baden B a d e n f i GEOLOGICAL SETTING A N D PREVIOUS GEOCHRONOLOGICAL |  | | Journal (article/letter/editorial) | | Original Article The metahyaloclastitic matrix of a unique metavolcanic block reveals subduction in the...implications for the assembly of Pangea I. Novo-Fernández1, A. Garcia-Casco2,3, R. Arenas1*, R. Díez Fernández1... CSIC), Universidad Complutense. 28040 Madrid, Spain. 2 Departamento de Mineralogía y Petrología, Universidad...Universidad de Granada. 18071 Granada, Spain. 3 Instituo Andaluz de Ciencias de la Tierra (CSIC, UGR).... E-18100 Armilla, Granada, Spain * Corresponding author at: Departamento de Petrología y Geoquímica |  | Merschat, Arthur J., Holm-Denoma, Christopher S., Levine, Jamie, McAleer, Ryan J., Southworth, Scott, Wilson, Crystal G. (2016) Geology of the Mount Rogers area, revisited, Blue Ridge, VA–NC–TN. Field Trip Guidebook. Carolina Geological Society | Report (issue) | | ....................................29 Elizabeth A. McClellan, Christopher S. Holm-Denoma, Raymundo Balderas...stay there very long and moved to the USGS to begin a long and successful career. I do not think that Doug...the small classes that we had in those days, but a few of us were drawn to the subjects that he taught...Doug frequently read his presentations that with a thorough understanding of the subject. Optical mineralogy...up for petrology and thought that there would be a similar arrangement, but it turned out that I was |  | | Journal (article/letter/editorial) | | Thesegridsindicatethatstibniteis the stableantimony phasefor a widerangeof physicochemical conditions encountered...withf% across thekermesite-stibnite boundary for a widerangeof pH (--...stablephaseovera broadrangeoff%-pH conditions andconsequently is a common supergene mineral.Senarmontite stability is...form at a lowtemperature, evenwhentheorefluidswereinitially at a veryhightemperature; (9,)why a highproportion...deposits commonly conore mineralof antimony in all but a fewprimaryantimony geneconditions; goldandviceversa |  | | Journal (article/letter/editorial) | | England). 3 ° Strips for Fourier A n a l y s i s and S y n t h e s i s A t h i r d issue of these Fourier...Fourier strips has now been completed, a n d the sets can be supplied in the following two forms: (1) U n...(except t h a t the h = 30 tables are printed on one side only). Instructions for c u t t i n g a n d for...for the m a k i n g of suitable boxes can be supplied. Delivery of this form is prompt. Price £15, plus... m o u n t e d in two mah o g a n y boxes w i t h sloping sides, r e a d y for use. Delivery time in |  | | Journal (article/letter/editorial) | | T HN A MERICAN M INERALoGIST JOURNAL OF THE MINERAIOGICAL SOCIETY OF AMERICA Vol. 18 JANUARY, 1933...southwestern Arkansas. \Mhile engaged in a petrographic examination of a suite of these ores for Dr. GeorgeC...county, near the towns of Crawford and Jackfork. A furnace is now in operation and economic appraisals...the fractures and bedding planes of the sandstone, a gray to buff rock which has been firmly cemented with...measure, on the average, 0.1 mm. in diameter and have a well rounded appearanceas if waterworn. Other detrital |  | | Report (issue) | | Smoky Mountains National Park (GSMNP) as part of a U.S. Geological Survey (USGS)-National Park Service...used by GSMNP in the preparation of a digital geologic database and a new l:100,000-scale bedrock and surflcial...discussed in detail by Hadley and Goldsmith (1963). A regional tectonic syntheses, which includes the area...extensive reference list accompanies a recent study by Montes (1997). A non-technical summary and guide to...be found in Harry L. Moore (1988). Additionally, a visitor's type geologic map and text on the rock types |  | Holdaway, M. J., Mukhopadhyay, Biswajit, Dyar, M. D., Guidotti, C. V., Dutrow, B. L. (1997) Garnet-biotite geothermometry revised; new Margules parameters and a natural specimen data set from Maine. American Mineralogist, 82 (5) 582-595 doi:10.2138/am-1997-5-618 | Journal (article/letter/editorial) | | Garnet-biotitegeothermometry revised:NewMargulesparametersand a naturalspecimendata setfrom Maine M.J. HolnAwAy,r...reducing /o, with graphite, a limited range of P (-3 to 4.5 kbar), and a moderaterange in Z (-550650...(-550650 'C), and which were all analyzedon a single microprobe using the same standards. Results indicate that...with 530 'C previously calculated and that the muscovite-breakdown7 is consistentwith experimental data...Perchuk and Lavrent'eva (1983) experimental Is with a standarddeviation of 12 "C and discriminatesthe assemblasesin |  | | Journal (article/letter/editorial) | | Starra,Osborne,andBigCadiadeposits)formthe basisfor a moregeneralvolcanogenic copper-bearing oxidemodel...ide-chlorite, to massive quartz-ironoxide,to muscovite-epidote-chlorite, depending on the salinityandpH...orepositions recordthreeepisodes ofhydrothermal activityin a stackedsystem,with evidenceof overprintingin the earlierexhalites...precipitation fromtheoxidizedandH2S-deficient versionof a volcanic-hostedmassivesulfide fluid, in an oxidized...therequisiteoxidizedfluvialandshallow-marine sediments. A second possible sourceofoxidizedmetal-bearingflui |  | | Journal (article/letter/editorial) | | excellent, but terminates at a potassium content significantly less than that of a true mica The excellent...untii the beginning of metamorphism. h.rtnoouctrow A crucial matter in the problem of the origin of illite...temperaturedependence of the stable polymorphs of ideal muscovite. Yoder and Eugster (1955) found that the 1Md polymorph...muscovitecomposition.I{owever, the 1M polymorph appearsto be a stablepolynlorph in dioctahedralmicas containingconsiderableamounts...fraction, thus reopeningthe considerationof illite as a diageneticproduct. Independently of how thesetwo sets |  | | Journal (article/letter/editorial) | | four bands observed in each case are consistent with a random distribution of the magnesium and substituting...more theoretical substitutions. It was subjected to a careful infrared study (Farmer, 1958) before similar...subsequentwork (Saksena,1961; Stubican and Roy, 1961 a, b; Farmer and Russeil 1964) has been largely concerned...recorded in the present paper has already been used in a study of part of the hydroxyl stretching region of...Immediately after the precipitation of hydrated silica, a total of 3 mM of Mg, Ni, Co, Zn, Fe, Mn and Cu in |  | | Journal (article/letter/editorial) | | scale, the LCT pegmatites’ emplacement. Here we apply a spatial statistical analysis to the LCT-pegmatites...individual rock types or structures. We show that a spatial relationship can be quantified between LCT-type...N015° direction as the trend of the A class-faults, which is parallel to a large sheared corridor described...between faults and pegmatites, our results point out a lack of spatial link between each of the pegmatite...thus suggest that pegmatites were emplaced along A-faults trend. The development of these faults could |  | Cao, Shuyun, Neubauer, Franz, Bernroider, Manfred, Genser, Johann, Liu, Junlai, Friedl, Gertrude (2017) Low-grade retrogression of a high-temperature metamorphic core complex: Naxos, Cyclades, Greece. Geological Society of America Bulletin, 129 (1) 93-117 doi:10.1130/b31502.1 | Journal (article/letter/editorial) | | Retrogression of a high-temperature metamorphic core complex Low-grade retrogression of a high-temperature...Geology, University of Salzburg, Hellbrunnerstrasse 34, A-5020 Salzburg, Austria State Key Laboratory of Geological...the footwall interior. In order to contribute to a better understanding of exhumationrelated retrogression...within the Aegean Sea is presented that provides a new perspective on low-grade retrogression during...conditions during brittle-ductile transition. Within a continuum of retrogression, 40Ar/ 39Ar white mica |  | Morey, A. A., Tomkins, A. G., Bierlein, F. P., Weinberg, R. F., Davidson, G. J. (2008) Bimodal Distribution of Gold in Pyrite and Arsenopyrite: Examples from the Archean Boorara and Bardoc Shear Systems, Yilgarn Craton, Western Australia. Economic Geology, 103 (3) 599-614 doi:10.2113/gsecongeo.103.3.599 | Journal (article/letter/editorial) | | Systems, Yilgarn Craton, Western Australia ANTHONY A. MOREY, predictive mineral discovery*Cooperative Research...analyses show that the gold-bearing minerals possess a number of similar textural features, including the...alteration rims. The alteration rims are characterized by a higher-thanaverage atomic mass (mainly owing to arsenic...also have been added by hydrothermal fluids during a later stage of mineralization. In situ geochemistry...trace elements within pyrite and arsenopyrite have a relatively uniform distribution, whereas later-stage |  | | Report (issue) | | determination (0.02 ppm) in the rest of the samples. A few samples contain small amounts of bismuth, molybdenum...tin. INTRODUCTION In the fall of 1968, Lesure made a geochemical reconnaissance of some gold and copper...S. Geological Survey (USGS) heavy metals program. A few samples are from the Hamme tungsten mine, Vance...the rock for an interval of 0.3 to 8 m (table 1). A few samples are composites of dump or float material...and were pulverized to minus 140-mesh (0.105 mm) in a vertical grinder with ceramic plates. Each sample |  | Nuelle, L.M., Proctor, P.D., Grant, S.K. (1985) Vein formation and distribution, Ohio and Mt. Baldy districts, Marysvale, Piute County, Utah, USA. Mineralium Deposita, 20 (2) doi:10.1007/bf00204323 | Journal (article/letter/editorial) | | districts near Marysvale, Utah, are situated within a calc-alkalic rock assemblage of the Bullion Canyon...three portions: 1) a lower laharic sequence of epiclastic breccias and autobreccias, 2) a middle portion...portion containing mostly lava flows, including a dacite flow with cupola magma characteristics, and tuff and...lapilli breccias, and 3) an upper portion containing a local volcanic vent complex and the ash-flow Delano...changes during vein fluid deposition account for a district wide zonation of vein types: 1) the boiling |  | | Journal (issue) | | in March, 1998. To my knowledge there has not been a large quantity of good specimens. The ~stals can get...completely coated with inesite, apophyllite, etc. A Continued on page 4 Fig. 1. Apophyllite, Jianghshan...apophyllite group these specimens belong. A more recent find involves a new locality for spessartine 1998 California...California Show was held again in Pomona, but luckily in a hall that was not quite so large. The theme was pyrite...society in the Western United States (since 1931!) has a great many advanced collectors, and with the variety |  | | Report (issue) | | LIST 09.02.01 Preliminary Draft 2 OF TABLES TABLE A: TABLE B: TABLE C: ANOMAWUS TABLE D: 17 ANOMALOUS...AT Bø MINE. 25 26 TABLE 1: METALS ANALYZED FOR A SAMPLE COLLECTED AT FJELESTAD 26 TABLE J: ANOMALOUS...SHEAR ZONES FIGURE 7: COLVINE'S (1989) MODEL OF A DEEPCRUSTAL SHEAR ZONE SHOW1NGTRANSMONS BETWEEN DEFORMAT1ONAL...MAP OF 11-IEROTEMO - Bo AREA FIGURE 19: PHOTO OF A PILLAR SUPPORITNGTHE HANGING WALL AT Bø MINE Valley...2 Executive Summary The Mandal —Ustaoset zone is a large transcrustal fault that extends from near Mandal |  | | Report (issue) | | North Carolina Geological Survey graphic province, a major geographic entity that extends for nearly 600...Front, an erosional escarpment. Hack (1982) presented a comprehensive geomorphic analysis of the Blue Ridge...(Fenneman, 1938), Hack divides the area into a northern and a southern section. Hack’s Southern Blue Ridge...within these areas may mark old erosional levels. A distinctive soil, classified as Braddock by area soil...rather than residual material. It is distinguished by a high sticky clay content, especially pronounced deep |  | Baziotis, Ioannis, Mposkos, Evripides, Windley, Brian F., Lamont, Thomas N. (2020) Exhumation of Attica high-pressure rocks in a subduction channel: New metamorphic PT constraints from Attica, NW Cyclades, Greece. Lithos, 354. 105266 doi:10.1016/j.lithos.2019.105266 | Journal (article/letter/editorial) | | Pre-proof Exhumation of Attica high-pressure rocks in a subduction channel: new metamorphic PT constraints...L.N, Exhumation of Attica high-pressure rocks in a subduction channel: new metamorphic PT constraints...https://doi.org/10.1016/j.lithos.2019.105266. This is a PDF file of an article that has undergone enhancements...enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability...We provide new integrated thermodynamic data from a lower tectonic unit indicating 6 that the metamorphic |  | | Book (volume) | | Inter-Union Commission on Geodynamics Editorial Board A. L. Hales, Chairman R. D. Russell, Secretary O. L...Anelasticity in the Earth F.D. Stacey, M.S. Patterson,and A. Nicholas [Editors] 5 Evolution of the Earth R.J...THE Gee, OF J.W. REPUBLIC OF SOUTH AFRICA, A SUMMARY 21 IN THE LIGHT OF RECENT 31 DATA...DAMARA UPINGTON THE A. Borsuk CORRELATION J.F. THE ACROSS THROUGH A.M. A Heidecker, CALEDONIDES...Halbich POSSIBLE R. B.A. Turner GEODYNAMICS A AUSTRALIA Rickard, OF THE and W.A. APPALACHIAN |  | | Report (issue) | | in composition, and many bodies comprise more than a single rock type. The rock classification used throughout...addition, a small body of unusual monzonite of unknown extent crops out near Erskine Creek. A generalized... basement rocks of the southern Sierra Nevada at a scale of 1:250,000 locates and briefly describes 63...to show the extent of individual units and also in a summary figure to show the areal distribution of various...biotite, and black hornblende. One of my colleagues (a highly-placed government official) refers to these |  | | Journal (article/letter/editorial) | | between 1897 and 1958. Such lists evidently meet a generally-felt need, as they now appear in the American...(including mistransliterations ; only those errors t h a t are dangerously near another accepted name, or are...consistently used b y their author, or whose original m a y not easily be recognized, have been included) ;...28 are names for mixtures or for groups rather t h a n for individual species ; and 36 were probably not...characterized or of such uncertain individuality t h a t a species name is premature, and 68 are superfluous |  | | Journal (issue) | | the author Handbook for the Amateur ypidary A must for a jem cutt Nd potential gem cut ters. Price: $3...00. . The Gem Hunter's Guide by Russe P. Macfall. A list of all important gem locale n the United State...Flint, Schuchert, and Dunbar iT navent a ge } TexT y Ww want a py tT Th . r lrad f |; trat Actua Ww i...i K noine nt )S€ n 4 j eae t Tr } sbroa We have a limit ed uUpDE tr é 7 r af sa Price: $4.50. The Art...piate pursuing Tne hopoboy rT gem utting should have a DY t thi book. Written by H. C. Dake tor of The Mineralogist |  | | Book | | pages; figures. 276 ELEMENTARY ECONOMIC GEOLOGY a H. RIES, A.M., Pu.D, = PROFESSOR OF GEOLOGY NEW...book the aim has been to make one ‘short enough for a one term course in Economic Geology. It has therefore...description of individual localities to a minimum, although a sufficient number are briefly discussed...much technology, as this is hardly appropriate to a text on Economic Geology. The author has retained...separately. This seems to him to be a more logical method than to group a number together according to their |
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