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| Mineralogist, Volume 68, pages 512-516, 1983 Alkremite, garnetite and eclogitexenolithsfrom Bellsbank and Jagersfontein...South Africa Rrcueno A. ExLev, JosepH V. Sutrn Department of the GeophysicalSciences The University of...Chicago Chicago, Illinois 60637 eNp J. Bnnnv DawsoN Department of Geology University of Sheffield Shffield,...flesh-colored (5Vo).Xenolith B is essentially a garnetite, with euhedral garnets(5 mm). Marginal inclusions...2$02.00 512 513 EXLEY ET AL.: ALKREMITE. GARNETITE AND ECLOGITE XENOLITHS Table l. Electron microprobe |
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| suggest that the transformation from eclogite to garnetite would occur primarily over a limited depth interval... Gasparik Center for High Pressure Research, Department of Earth and Space Sciences, State University...Pressure-composition phase diagram for the join (enstatite, ity of the garnet on the enstatite-jadeite join. In the...re- bility, the transformation from eclogite to garnetite will sults can be used to estimate the mineral...pleted at 17 GPa, and eclogite will transform to garnetite. tholeiites by Irifune et al. (1986). However |
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| Johannesburg, Private Bag 3, Wits 2050, South Africa b Department of Physics, University of Botswana, Private Bag...Bag UB704, Gaborone, Botswana c Department of Geological Survey, Private Bag 14, Lobatse, Botswana Abstract...Alternative explanations include the presence of garnetite-rich material or ilmenite-forming phase transformations...(2003) 353–367 355 Fig. 1. Map showing locations of mine tremors and earthquakes recorded by broadband stations...crust to form a gravitationally stable layer of garnetite some 50 km thick on top of the 660-km discontinuity: |
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| mafic massifs; subduction * Present address: Department of Terrestrial Magnetism, Carnegie Institution...clinopyroxenite; Wb, websterite; Me, megacryst; Gnt, garnetite; PxPe, pyroxenite that contains thin pendotite...pattern as expected (WV2), the pattern of the other garnetite (WV1) is more complex. A strong fractionation... Apatite is present only as a minor phase in garnetite samples WV1 and WV2, where it serves as an important...clinopyroxenite (DW321B) and an apatite-ilmenite garnetite (WV1). The garnet clinopyroxenite is representative |
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| of the diamond inclusion were performed in the Department of Earth and Planetary Sciences, Tokyo Institute...Urakawa, S., 1996, In-situ measurement of viscos ity and density of carbonate melts at high pressures:...E., and Hibberson, W. 0., 1986, The eclogite-garnetite transformation at high pressure and some geophysical |
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| mag mas, according to the recent experimental and mine r a l o g i c a l d a t a (Ringwood a n d Irifune...mushroom close to the boundary of the refractive garnetite material (Fig. 6). T h e s e broad spots could...plume head separation at the 660 km discontinu ity: Science, v. 266, p.1367-1369. Berzina, A. P., Dobretsov...flux between lower and upper mantle and stabil ity of layering: Earth and Planetary Sciences Letters |
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| temperature variations but by variations in the alkalin ity of the fluid (a) at a low K and Na activity, the...number of types: pyroxenite, garnet pyroxenite, garnetite, garnet amphibolite, etc. Figure 19 presents a...a micrograph of scapolite–hornblende garnetite in which scapolite is chlorinefree sulfatemeionite (Table...E.V. Guseva and N.N. Kara taeva (both of the Department of Petrology, Moscow State University) for conducting |
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| Advertising Department of the Sullivan Machinery Company. Address all Communications to MINE AND QUARRY...address upon request. Readers are requested to notify MINE AND QUARRY of any correction or change in address...in this issue. may be interesting at this time. MINE AND QUARRY 202 The new West Neebish channel; the...THE ST. MARY’S RIVER. swarm]. cmuncsmmnaxcr; or “MINE & QUARRY.” Sault Ste. Marie, Mich.) During the...ore carriers, many of which are over 600 feet MINE AND QUARRY 203 long and draw 19 feet or more of |
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| Stacey L. Corrie1 and Christopher Markley1 1 Department of Geosciences, Boise State University, Boise...Powell model also overpredicts stabil- Table 1. ity of coexisting amphibole assemblages. Overall, however...consequences for 176Lu-176Hf geochronometry. Department of Geosciences, 197. University of Arizona, Tucson...geochemistry of zircon, monazite and garnet from the garnetite and/or associated other high-grade rocks: Implications |
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| Cemetery ................... 12 Mowry Town Site and Mine ........................ 14 Mowry Sme ter l Site...shop, and from eight to ten Chinese laundries. The mine was closed in 1884 after producing about $500,000...This was the patented mill site for the American Mine. In the 1882 patent survey, the large sycamore tree...Trench Camp town site and the World's Fair Mine. The Trench Mine is one of the oldest mines in Arizona, dating...by Cambrian sedimentary rocks south of the Mowry mine; Paleozoic carbonate and clastic rocks; Triassic |
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| single mineral. masses In such Tourmalinite, Garnetite, as occur cases The separation rocks is based... D A A G N E Name. A . Hard- Grav- ness. ity. Streak. Color. I N 1. Fusibility Easy. 2.5...LUSTRE. Name. . Hard- Grav- Fusibil- ness. ity. ity. Color. IN 1. Streak White. 2. Bismuth. ...LUSTRE. | O 5S NAME. . 1. Hard- Grav- ness. ity. Lustre. Color. N Streak White. (a) Volatile... 1. METALLIC N s . N Hard- Grav- ness. ity. Streak. Color. Fusibility Easy. Sternbergite |
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| 1989, Portland, Oregon 1990 STATE OF OREGON DEPARTMENT OF GEOLOGY AND MINERAL INDUSTRIES 91 0 State...Michigan Tampa, Florida 7th 197 1 8th 1972 Iowa C ity. Iowa 9 th 1973 Paducah, Kemucky Columbus, Ohio...Oregon o nh Aurora. Illinois NOTICE The Oregon Department of Geology and M incml Industries is publishing...subject m:mer is consistent with the mission of the Department. To facilitate time ly distribution of information...contact the appropriate authors directly. Oregon Department of Geology and Mineral Industries Special Papers |
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| Butte and Ball Rockareas, northernCal iforni a Coast Ranges 365 BURNHAM, C.V.: Presentationof t h e M...I inanite1049 ilrnenite geobarometer qn6 5L2 Garnetite, SouthAfrica di agrams pyroxene 477 G A S P AJR...7?1 carbonatitesfrom Jacupiranga quartz solubil ity 960 Complex,Brazil Exsolution Magnetitein and_: h...(Jones) 854 731 gai nesi te Gemstones 1022 sol ubi ity H.E.: lilineralsof Pemberton, P e i s l e y i t e |
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| One of such hypotheses considers the possibil ity of diamond formation by cavitation during collapse...vein) ultrabasic and basic rocks of high alkalin ity. However, according to modern concepts, kimber lites...(HM 009) from the kimberlite dikes of the Helam Mine deposit, South Africa [102]. The Na content of these...experimentally established significant solubil ity of the sodium majorite component in garnets allows...buffer). As a whole, the range of oxygen fugac ity in natural diamond reaches six orders of magni tude |
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| represent those of eclogites and only a small minor ity belong to ultramafic rocks, the term "eclogites"...belts were derived from protoliths of oceanic affin ity. The relics of UHP conditions, if any, do not directly...Eclogite Eclogite Eclogite Eclogite Eclogite Garnetite Ga lherzolite Eclogite Ga pyrox. Ga pyrox. Ga |
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| Quite often, decimeter-sized quartz-bearing garnetite or quartz-rich eclogite nodules occur, as centimeterthick..., and Schreyer, W., 1983, Synthesis and stabil ity of the garnet calderite in the system Fe-Mn-Si-O: |
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| G. Liou , R. Y. Zhang & Bor-Ming Jahn b a Department of Geological and Environmental Sciences , Stanford... East-Central China J. G. LIOU, R. Y. ZHANG, Department of Geological and Environmental Sciences, Stanford...1994; Yang et al., 1998). Rare corundum-bearing garnetite and eclogite occur as lenses in the Zhimafang...(3) What is the maximum pressure for the stabil ity of the hydrous-carbonate phases contained in the |
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| their hard work and dedication. Brian J. Skinner Department of Geology and Geophysics Yale University New...Processes in Geologic History Charles Meyer Department of Geology and Geophysics, University of California...base of the Complex (Vermaak, 1976). At the Atok mine, platinoid minerals tend to occur at the boundaries...cratonic basins, and from the fact that much of ity and weathering both contributed extensively to the...breakup seems to have initiated the generative capac¬ ity for sulfide ores in shelf sediments as at Ducktown |
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| Association of Canada - Mineral Deposits Division Department of Earth Sciences Me1norial University of Newfoundland...avec l'editeur. Gold-rich specimen fro1n the Don,e Mine, Tim1nins, Ontario that was presented to GSC in...adjusted using lhe inflation rates of United States Department Labor (2006) and $USO converted to $CAD using... may change the para1neters of the mathematical mine n1odel referred to above. Modifications to the 1nine...l-producing mines closed and only one (Voisey's Bay Ni-Cu mine in Labrador) opened. On the brighter side, the potential |
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| 271 5 H. A. Lewis *369 "260 A 345 Bishop Creek Mine 8S Black Diamond Header H. Briggs 208 Blackwater...Beresite Dikes Biological Necessity, -J. A Report Mine Tunneling 332 330 6 72 149 113 109 Report Report...(P-t.) Chuquicamata Banks and Industry Barraniia Mine, Sudan Bastin, Edson S Pitchblende Behrens, Broken...) Concentrator, Hughes' Alluvial (p.t.) Concrete Mine-Supports, Reinforced (P-t.) Congo, Mineral Resources...Dredging in New South Wales Drucker, A. E Drumlummon Mine, History of (p.t.) Short Tube-Mills (c.l.) Dryer |
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| . . . . . . . . . . . Sketch 1nap of Atlantic coast from NW Africa up to southern Scotland Shropshire...distance of 700 km south from the Mediterranean Coast and as far as 200 km north of the outcropping Pre-Cambrian...SS\V of the to,vn of Algiers on the Mediterranean coast. Soon after the International Geological Congress...,·e find a state1nent: "subsidence of the Gulf Coast geosyncline is thought to have accompanied the same...volconics Geosynclinol metosedimenls Gebel Mountain Mine ; 0 Mb Marble 25 km 25° ',......, --'- 24° |
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| been a tendency among those who search for and mine industrial minerals to call them ‘ore’ and to measure...reluctance to allow large isolated have mines or mine a because ment unemploy into plunged communities...with many metals during this century has been to mine lower and lower grade ores. This has led to the...For example, to develop the large RTZ copper-gold mine at Bougainville, at 1979 prices. Papua New Guinea...branching as they go, an example being the Providencia mine in Mexico where a single pipe at depth feeds into |
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| IN AUSTRALIA Cover Picture—The Argyle Diamond mine Photo by courtesy of Ashton Mines Limited GEOLOGICAL...deposits An exploration case history in the Telfer mine corridor The discovery and evaluation of gold mineralisation...Territory Tertiary to Recent deposits Boddington gold mine Mt Gibson gold deposit M. P. M. M. El-Ansary and...exploration in Australia Elura zinc-lead-silver mine, Cobar, N.S.W. Exploration at Dugald River, Queensland...recognition for outstanding studies of the West Coast mining fields that had come into being. The South |
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| Frontispiece: Olivenite, 1.6-cm cluster, Majuba Hill Mine, Antelope district, Pershing County. N. Prenn collection...cultural heritage for future an agency of the U.S. Department of the Interior. This land comprises 67 percent...COLOR PLATES (following page 242) Gold, Mexican Mine Gold, Majuba Placer Pyromorphite after Galena with...with Conichalcite Gold, Round Mountain Mine Quartz, Lovelock area Acanthite Grossular, Nightingale...Meikle Mine Malachite and Azurite, Aurichalcite with Hemimorphite Azurite Barite, Meikle Mine Barite |
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| Leigh McDonald Co\·er photo: \\ 7 ulfenite, Rowley Mine, Maricopa County, 4 cm high specimen, Evan and Melissa...been added. TI1eRRUFF project in the Geosciences Department at the University of Arizona has been a significant...1941, Frederick 'vf./.Galbraith, chairman of the Department of Geology at the Universityof Arizona and curator...material was cut parallel to the grain. The Blue Ball Mine, in Gila County, has produced thousands of azurite...quantity of this material came from the United Verde Mine at Jerome, GEMSTONES ANDLAPIDARYMATERIALS OF ARIZONA |
