 | | Report (issue) | | DEAN KLEINKOPF and MELVILLE R. MUDGE GEOPHYSICAL FIELD INVESTIGATIONS GEOLOGICAL SURVEY PROFESSIONAL ...Introduction -------------------------------------- 1 Field measurements --------------------------- 9 General...properties ------------------------------Magnetic field configuration -------------------- 10 Geologic...structure ----------------------------- 6 Gravity field configuration --------------------- 10 Precambrian...----------------- Page III r· A1 4 GEOPHYSICAL FIELD INVESTIGATIONS AEROMAGNETIC, BOUGUER GRAVITY, AND |  | | Report (volume) | | metallic minerals______________________________ 202 Magnetite deposits _-______--___--___---_---_-___-.---_...P. Ross ABSTRACT This report, based mainly on field studies by E. A. Scholz in 1943 and by C. P. Ross...shown in figure 6. The present report is based on field work as above described, and also on published articles...the Sweetgrass Hills were greatly aided by C. E. Erdmann and J. T. Gist of the Conservation Branch of the...township and section corners were found in the field and identified on the photographs in only a few |  | | Report (volume) | | pocket 15. Map showing area favorable for strip mining in sees. 15, 16, 21, and 22, T. 11 N., R. 1 E....60 feet or less and could be obtained by strip mining methods. Seven miles northeast of Castle Rock 8...area because of the paucity of coal outcrops and mine data. The district is south of the Centralia-Chehalis...fuel for steam locomotives renewed the district's mining activity in the early 1890's and several prospects...production or had been abandoned. There was little mining activity in the district during the early 1900's |  | | Journal (article/letter/editorial) | | COUNTRY-ROCK MATERIAL: AN EXPERIMENTAL STUDY Saskia ERDMANN§ Department of Earth Sciences, Dalhousie University...are new magmatic solids such as cordierite and magnetite, and a highly peraluminous partial melt. Quartz...given example, but an integrated approach involving field and textural observations, mineral and whole-rock...assimilation in igneous rocks at the best possible level. Field and textural data may give estimates of the abundance...Bouloton 1992, Clarke et al. 2005, Clarke 2007, Erdmann et al. 2004, Gottesmann & Förster 2004, Maillet |  | | Journal (article/letter/editorial) | | ARMSTRONG coals of eastern Montana; also, the magnetite-bearingbeds of certain Cretaceoussandstonesmay...benefitof discussions with them: in particular,C. E. Erdmann for informationabout the stratigraphyof central...Hills 2. Blue Buttes 3, P.kalaka HiUs and Ugnite field Uraniferous carbonaceous Location of plant specimen...the Fort Union formation. In the Ekalaka lignite field, uranium occursin ironstoneconcentrations in sandstoneof...probablyaccumulated as beachor offshoreplacerdeposits. C.E. Erdmann (written communication, 1953) foundabnormalradioactivityin |  | | Report (issue) | | more promptly available to p'roperty owners and mine operators concerned ~'lith exploration for and production...••• , •••••••••••••••••••••• , ••••• , •••• 49 Mining - Oil California •••••••••••••••••••••••e•••••••••••...011 •••••••••••••·••••••••••••,••••••••••••••• 4S Mining ••••••••••••••••••••••••••••••••••••••• 49 Oregon...eastern vein of the Argentina mine. 5. Geology and section of the Linena mine. 6. Geology and cross saction...the·Palo Verde mine. '7. Geology of the Pensamiento mine. S. Geology of the Piedra Azul mine. 9. Geology |  | | Journal (article/letter/editorial) | | conditions slightly below the quartz–fayalite–magnetite buffer. The relatively low water content is remarkable...observations, Communicated by Jochen Hoefs. * Martin Erdmann m.erdmann@mineralogie.uni‑hannover.de 1 Institut...2000; Wilson et al. 2006; Silantyev et al. 2014; Erdmann et al. 2015). The generation of highly evolved... 2007; Brophy 2009; France et al. 2010, 2014; Erdmann et al. 2015), extensive fractional crystallization...Koepke et al. 2004; France et al. 2010, 2014; Erdmann et al. 2015), crystallization processes (Juster |  | Fischer, Lennart A., Erdmann, Martin, France, Lydéric, Wolff, Paul E., Deloule, Etienne, Zhang, Chao, Godard, Marguerite, Koepke, Jürgen (2016) Trace element evidence for anatexis at oceanic magma chamber roofs and the role of partial melts for contamination of fresh MORB. Lithos, 260. 1-8 doi:10.1016/j.lithos.2016.05.001 | Journal (article/letter/editorial) | | contamination of fresh MORB Lennart A. Fischer, Martin Erdmann, Lydéric France, Paul E. Wolff, Etienne Deloule...Please cite this article as: Fischer, Lennart A., Erdmann, Martin, France, Lydéric, Wolff, Paul E., Deloule...Nb and Zr anomalies (e.g., France et al., 2014; Erdmann et al., 2015). This conductive boundary layer represents...(Wilson et al., 2006; Teagle et al., SC R 2012; Erdmann et al., 2015). The mineral assemblages of the felsic...(Gillis and Coogan, 2002; France et al., 2010, 2014; Erdmann et al., 2015). For the Oman ophiolite, this model |  | Öhman, Lennart, Nysten, Per, Langhof, Jögen (2004) Famous Mineral Localities: The Bastnäs Mines, Riddarhyttan Ore Field, Bergslagen District, Västmanland, Sweden, in Rare Earths!. The Mineralogical Record, 35 (3) 187-200 | Journal (article/letter/editorial) | | Localities: The Bastnäs Mines RIDDARHYTTAN ORE FIELD, BERGSLAGEN DISTRICT, VÄSTMANLAND, SWEDEN Lennart...and lanthanum. INTRODUCTION The Riddarhyttan ore field is situated in the county of Västmanland, south-central...county of Västmanland and the Riddarhyttan ore field. of rare-earth minerals was discovered at a depth...dumps, about 30 meters from the Sankt Göransgruvan mine. The zone contained many cerium minerals, as well...locality. HISTORY The Riddarhyttan ore field is part of the vast mining and foundry area named Bergslagen |  | | Book | | that has contributed most to the knowledge Erdmann, Scheerer, Weibye and Paijkull. of Norwegian mineralogy...book. Br0gger was able to describe eight that Norway is today a country without an academic chair in...was not possible to publish the present book in Norway. 5 ..., Introduction Alf Olav Larsen It is...diaspore from the Saga I quarry, M0rje, Porsgrunn. Field height 7 mm. Collection of A. 0. Larsen. Photo by...Edy ( 1820). Courtesy of the National Library of Norway, picture collection. 8 The history Alf Olav |  | Yudovskaya, Marina A., Costin, Gelu, Shilovskikh, Vladimir, Chaplygin, Ilya, McCreesh, Matthew, Kinnaird, Judith (2019) Bushveld symplectic and sieve-textured chromite is a result of coupled dissolution-reprecipitation: a comparison with xenocrystic chromite reactions in arc basalt. Contributions to Mineralogy and Petrology, 174 (9) doi:10.1007/s00410-019-1613-3 | Journal (article/letter/editorial) | | with host minerals, hydrothermal alteration and magnetite replacement related to serpentinization are reflected...of glass, fine-grained plagioclase laths and magnetite (Fig. 4d). The representative chemical compositions...Waterberg do not contain either cumulus chromite or magnetite. The Grasvally section is after Hulbert and von...collected from natural exposures during 2004–2013 field expeditions. Altogether, over 300 conventional polished...mineral assemblages were investigated with a FEI200 field-emission SEM equipped with an energy-dispersive |  | | Journal (article/letter/editorial) | | first time high-precision measurements of high-field-strength element (HFSE) abundances that now permit...hydrated oceanic gabbros at low pressures. Likewise, Erdmann et al. (2015) confirmed the anatexis of only slightly...clinopyroxene (cpx), 10% orthopyroxene (opx), 3% magnetite (mag) and 4% ilmenite (ilm). Importantly, the...crust around magma lenses (Beard and Lofgren 1991; Erdmann et al. 2015). The conditions for anatexis at the...melts at shallow pressures (Erdmann et al. 2015). The experiments by Erdmann et al. (2015) have also suggested |  | | Report (issue) | | average nearer mafic end of range. Accessory magnetite (2/f), sphene (1/6), minor epidote; biotite, partly...idiomorhic granular. Accessory epidote (5>&), magnetite (3%) and sphene (1/6). Foliation, well defined...to gray siltite occurs throughout. Macroscopic magnetite octahedra typical but not ubiquitous. Top placed...Medium to thin bedded, typically slabby parting. Magnetite octahedra up to 1 mm across locally abundant....contact placed at lowest occurrence of carbonate or magnetite or, lacking those, above the highest black argillite |  | | Journal (article/letter/editorial) | | granitic rocks, including silicates and phosphates (Erdmann 2006), and sulfides (Samson & Clarke 2005). Any... We used synthetic standards: rutile for Ti, magnetite for Fe, Nb2CoO6 for Nb, Ta2O5 for Ta, and MnO2...on the amount of Fe–Ti oxides and the ratio of magnetite to ilmenite, might say more about contamination...isotopic ratios (Clarke et al. 1988), cordierite (Erdmann et al. 2004), and sulfides (Samson & Clarke 2005)...samples of the Meguma rocks available, and Saskia Erdmann of Dalhousie University for sharing her samples |  | | Journal (article/letter/editorial) | | Pupier et al. 2008; Brugger and Hammer 2010). As ERDMANN AND KOEPKE: EXPERIMENTAL TEMPERATURE CYCLING all...conditions of the vessel (QFM = the quartz-fayalite-magnetite buffer; intrinsic conditions of the IHPV (measured...Cpx(9.0), Pl(28.0), Qz(7.0), Ap Notes: Mag = magnetite, Ilm = ilmenite, Cpx clinopyroxene, Opx = orthopyroxene...ImageJ (see text for details). Run no. 962 ERDMANN AND KOEPKE: EXPERIMENTAL TEMPERATURE CYCLING framework...estimated in a companion study (preliminary results in Erdmann et al. 2012). For the preparation of the starting |  | | Journal (article/letter/editorial) | | dykes (Clarke and Carruzo, 2007; Erdmann and Clarke, 2007; Erdmann et al., 2007), iv) the entrainment...source during extraction (Dorais et al., 2009; Erdmann et al., 2009; Miller et al., 1988; Sawyer, 1996;...granite body through fractionation of the magma (Erdmann et al., 2009). In migmatites, the garnet and cordierite...ferromagnesian minerals they contain. Previous studies (Erdmann et al., 2009; Stevens et al., 2007) have examined...peritectic phases have been widely dispersed (Erdmann et al., 2009; Villaros et al., 2009), or converted |  | Zhang, Chao, Koepke, Juergen, Albrecht, Moritz, Horn, Ingo, Holtz, Francois (2017) Apatite in the dike-gabbro transition zone of mid-ocean ridge: Evidence for brine assimilation by axial melt lens. American Mineralogist, 102 (3) 558-570 doi:10.2138/am-2017-5906 | Journal (article/letter/editorial) | | (Gillis 2008; Koepke et al. 2008; Zhang et al. 2014; Erdmann et al. 2015). In such circumstances, assimilation...dedicated experimental studies (France et al. 2010; Erdmann et al. 2015) indicate that 558 ZHANG ET AL.:...conducted using an Element XR fast scanning sector field ICP-MS (ThermoScientific) working in the fast mode...boundaries of quartz, albite, actinolite, and magnetite (Fig. 4). The length of apatites varies within...showing pronounced depletion in Cl with time. Tiny magnetite crystals may occur as inclusions in apatite, but |  | Whitley, Sean, Halama, Ralf, Gertisser, Ralf, Preece, Katie, Deegan, Frances M, Troll, Valentin R (2020) Magmatic and Metasomatic Effects of Magma–Carbonate Interaction Recorded in Calc-silicate Xenoliths from Merapi Volcano (Indonesia) Journal of Petrology, 61 (4) doi:10.1093/petrology/egaa048 | Journal (article/letter/editorial) | | (En15-43Fs14-36Wo41-51) + plagioclase (An37-100) ± magnetite in the outer zones towards the lava contact and...pale green clinopyroxene and a concentration of magnetite (Fig. 2A). This is followed by a finer grained...commonly Fe-bearing phases (pyrrhotite, cubanite, magnetite) and occasionally apatite. Vapour-rich CO2 fluid...published data (Gertisser, 2001; Preece, 2014; Erdmann et al., 2016). In An-FeO space, xenolith core plagioclase...magmatic skarn xenoliths is magnetite, with 0.3 to 11.5 wt% TiO2. Magnetite within the xenolith cores is |  | | Report (issue) | | to 10 cm in length. Color index 10. Accessory magnetite (2 percent), sphene (1 percent), and epidote (greater...to gray siltite occurs throughout. Macroscopic magnetite octahedra common. Top of unit placed at base of...to thinbedded, typically with slabby parting. Magnetite octahedra up to 1 mm across locally abundant....of black argillite interbeds, and change from magnetite to pyrite which causes rusty weathering throughout...that the sulfide mineralization at the Sullivan Mine, Kimberly, B.C., formed in sediment that accumulated |  | | Report (issue) | | hydrocarbon potential. The appraisal is based on field and laboratory investigations of the geology, geochemistry...many subsequent economic geology studies, and the mine production records which they compiled have been...in vein deposits, and strataform titaniferous magnetite deposits. Aeromagnetic Map (MF-858G) The aeromagnetic...S. Geological Survey in mobile laboratories at field camps or in laboratories in Golden, Colo. The rock...v. 54, no. 8, p. 1123-1167. Dobbin, C. E., and Erdmann, C. E, 1955, Structure contour map of the Montana |  | | Report (chapter) | | in Atlantic Canada, such as in the Stoney Creek field (St Peter 1993; Mukhopadhyay et al. 2000; Mukhopadhyay...Minas Basin and forms much of its floor Fig. 2. Field view of the studied Wolfville Formation at Cambridge...mostly iron and iron–titanium oxides (hematite, magnetite and ilmenite, as well as goethite and leucoxene...predominant group comprises the opaques (hematite, magnetite, ilmenite, as well as goethite and leucoxene as...(1938), all of the studied garnets fall in the field of slates + granites and granite pegmatites (Fig |  | | Report (issue) | | Trondheim - NTH Norway S. Olerud Geological Survey of Norway Box 3006 N-7001 Trondheim Norway M. Martinsen...N-7034 Trondheim - NTH Norway F. D. Pedersen Norsk Hydro Box 200 N-1321 Stabekk Norway F. S. Nordrum The...The Norwegian Mining Museum N-3600 Kongsberg Norway H. K. Schonwandt Geological Institute University of...aa, 16H7 . t Oretlt. ft /Mm# »f.i Falu copper mine has been continuously mined for more than 900 years...Dahlberg’s Sveda Antiqua et Hodierna. 6 FOREWORD Mining has ancient traditions in Scandinavia and Finland |  | | Journal (article/letter/editorial) | | and Jianfang Cai Discriminating hematite and magnetite via scanning electron microscope–mineral liberation...Taivalkoski, and Marja Lehtonen 156 The use of magnetite as a geochemical indicator in the exploration...McFarlane, and James A. Walker 290 A review of pXRF (field portable X-ray fluorescence) applications for applied...applied geochemistry—Bruno Lemière 350 The Salave mine, a Variscan intrusion-related gold deposit (IRGD)...F. Sangster 509 The Kongsberg silver deposits, Norway: Ag-Hg-Sb mineralization and constraints for the |  | | Journal (article/letter/editorial) | | Switzerland. Blanfordite. L . L . Fermor, 1906. Trans. Mining and Geol. Inst. India, vol. i, p. 78. A monoclinic...occurring at Hitter~, Arendal, and other localities in Norway, as large orthorhombic crystals, which had previously... S.] Chocolite. J. Garland, 1894. Trans. Inst. Mining and Metallurgy, 1898-4, vol. ii, pp, 128, 224....vol. xiii, p. 369). Named from the Justus I salt-mine in Hanover, where the mineral was found. Kassiterolamprit...named after Victor Mieault, of Paris. Minotte. A mining term applied to oolitic brown-lron-ores (limonire) |  | Richards, Jeremy P., Razavi, Amir M., Spell, Terry L., Locock, Andrew, Sholeh, Ali, Aghazadeh, Mehraj (2018) Magmatic evolution and porphyry–epithermal mineralization in the Taftan volcanic complex, southeastern Iran. Ore Geology Reviews, 95. 258-279 doi:10.1016/j.oregeorev.2018.02.018 | Journal (article/letter/editorial) | | amphibole (magnesio-hastingsite) phenocrysts and magnetite–ilmenite mineral pairs from the Taftan and Bazman...were collected from surface outcrops during two field seasons in August 2012 and July 2013. All surface...surface weathering was removed by hammering in the field, and hand specimens were sent for polished section...Large (multi-kg) samples were collected in the field, but much of this material was lost in shipping... Locations of all analyzed samples, along with field descriptions and whole-rock analytical data are |
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