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  • initial sensitivity change of k-feldspar pirir

    15.12.2022· subsequently, the k-feldspar grains (ρ < 2.58 g/cm 3) were isolated by density separation with lithium heteropolytungstates (lst) heavy liquid and subjected to hf (10%) etching for 40 min to remove the α-dosed layer. finally, the k-feldspar grains were repeatedly rinsed by

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  • (pdf) depositional history and reservoir

    in book: alaskan north slope geology (pp.95-107) chapter: depositional history and reservoir description of the kuparuk river formation, north slope, alaska

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  • seldovia quadrangle alaska resource data file

    alaska resource data file this report is preliminary and has not been reviewed for conformity with u.s. geologi-cal survey editorial standards or with the north american stratigraphic code. any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the u.s. government. open-file report 99-391 o o

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  • bering glacier quadrangle alaska resource data file

    alaska resource data file this report is preliminary and has not been reviewed for conformity with u.s. geologi-cal survey editorial standards or with the north american stratigraphic code. any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the u.s. government. open-file report 02-115 o o

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  • a. bench scale flotation of feldspar using non

    a. bench scale flotation of feldspar using non-toxic activator and mixed cationic/ anionic collector : inovasi tersebut adalah mengenai proses pengkonsentratan feldspar dari pasir silika menggunakan teknik pengapungan yang berskala makmal (bench scale).

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  • some pegmatite deposits in southeastern alaska

    on the west coast of baranof island, southeastern alaska. the deposit, which comprises several pegmatite bodies, consists of quartz, albite-oligoclase, micro- cline, and mica, listed in the order of abundance. feldspar and quartz crystals in some places attain a length of more than 1 foot. muscovite mica as much as

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  • pre-late-wisconsin glacial history, coastal ahklun

    alaska, pre-late-wisconsin mountain glaciers there were much more extensive than during the most recent global glacial maximum (e.g., hamilton, 1994). the advance of late wisconsin ice was restricted to mountainous areas, thereby preserving an extensive record of older gla-ciations. the few coastal regions of the state that expose

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  • nickel-copper deposit at snipe bay baranof island, alaska

    wickel-copper deposit at swipe bay, alaska 325 from it, a soda-rich plagioclase feldspar (albite or albite- oligoclase), and a more calcic plagioclase feldspar (andesine or labradorite). apatite constitutes perhaps 1 or 2 percent of the rock. at most places the brown hornblende or its alteration prod- ucts make up more than 50 percent of the rock.

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  • apatite as a tracer for metasomatic processes in nepheline

    tionated products of the melt responsible for uralian-alaskan-type ultramafic cu-mulates found in zoned mafic-ultramafic complexes in the ural mountains (russia). these nepheline gabbros consist predominantly of coarse-grained clinopyroxene phe-nocrysts in a matrix of fine grained olivine, clinopyroxene, plagioclase, k-feldspar and nepheline.

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  • metallogenesis of gold in the tintina gold belt – alaska

    gold deposit isn interior alaska and the yukon. such gol is presend t in anastomosing stockwork quartz-feldspa, +/r - mica veins (several differen intrusionst an) d as equigranular, ductil e quart z (feldspar-biotite vein) s (pogo deposit).

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  • (pdf) geologic setting of the chena hot

    proceedings, thirty-second workshop on geothermal reservoir engineering stanford university, stanford, california, january 22-24, 2022 sgp-tr-183 geologic setting of the chena hot springs geothermal system, alaska amanda kolker1, rainer newberry1, jessica larsen2, paul layer2, and patrick stepp3 1 department of geology & geophysics, university of alaska

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  • uranium- and thorium-rich vesuvianite from the seward

    uranium- and thorium-rich vesuvianite from the seward peninsula, alaska gibn r. hnrauelnnnc u. s. geological survey department of geology, university of missouri columbia. missouri 652i i nno tnouas p. miller u. s. geological sumey 1209 orca street anchorage, alaska 99 50 l abstract

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  • data for plutonic rocks and associated gold- alaska

    data for interior alaska plutonic rocks (fig. 2) reveals a wide range of compositions, spanning diorite to alkali-feldspar granite, and accompanying mafic minerals. the more mafic rocks tend to contain hornblende and biotite; the more felsic biotite only; and the most felsic contain muscovite and biotite.

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  • geology along the taylor highway alaska

    feldspar. a common rock-forming mineral. it is white, pink, or gray. there are several different kinds. felsic rocks. light-colored rocks commonly high in quartz and light-colored feldspar. gabbro. a dark-colored, fairly coarse grained igneous rock com­ posed primarily of feldspar

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  • alteration of plagioclase and pyroxene

    adjacent to the fumarole, plagioclase >an 44 has been removed because of the increased solubility of albitic feldspar in chloride-rich solutions as a function of increasing temperature. on a submicrometer scale, a zonal sequence of replacement phases has developed at the interface between unaltered and altered feldspar.

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  • the johnson river prospect, alaska: gold-rich sea-floor

    the johnson river prospect, alaska: gold-rich sea-floor mineralization from the jurassic carl i. steefel* anaconda minerals company, anchorage, alaska 99503 abstract the johnson river prospect on the alaskan peninsula is an unusually well preserved jurassic example of gold-rich sea-floor mineralization accompanied by extensive anhydrite.

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  • eiment ter h2o anit ‑ust - ucla

    of the crystals optically identified as feldspar gave micro- probe analyseswith excess silica and were interpretedto be metastable.therefore,single-stepexperimentsonlyiden-

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  • abstract: reservoir potential of tertiary and mesozoic

    the cook inlet province of southern alaska is a forearc basin resulting from subduction of the pacific plate under continental north america. the basin is filled with up to 25,000 feet of tertiary nonmarine detritus and 30,000 feet of mesozoic marine and nonmarine deposits.

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  • intrusion-related gold deposits

    alaska 50.3 0.9 qtz-bt & calcareous schist granodiorite sheeted veins 92 bi, te, mo, as, sb, w, pb brewery creek, yukon 13.3 1.4 calcareous schist monzonite, syenite disseminated, veinlets 91.4 as, sb, (hg) shotgun, alaska quartz-biotite schist granite stockwork 70 ag, bi, mo, te, cu donlin creek, alaska 111 2.9 greywacke & shale

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  • testing post-ir irsl protocols for minimising

    request pdf | testing post-ir irsl protocols for minimising fading in feldspars, using alaskan loess with independent chronological control | concern over anomalous fading has been the biggest

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  • alaska division of geological & geophysical surveys

    blocky weathering, pyroxene and feldspar porphyritic, massive to vesicular and amygdaloidal flows 10-50 cm thick. dark gray where fresh, green to maroon where altered. apparently intercalated with basalts in southern rocky pass area between kuiu and kupreanof islands; also occurs in south central kupreanof island, and near exposures of

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  • amanita property, alaska - avidian gold

    arsenopyrite and quartz-feldspar veins gold occurs with bismuthinite, scheelite, arsenopyriteand quartz-feldspar veins modelshows inner au-bi, halo of sb-as soils show inner au-bi, halo of sb-as presentgrade of approx. 0.50 g/t au; cut-off grade 0.16 g/t au

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  • mineralogi - slideshare

    mineral feldspar terdiri dari potash feldspar (sanidin, ortoklas, mikrolin) dan soda lime feldspar (albit, oligoklas, andesit, labradorit, bitownit, anortit). mineral-mineral feldspatoid terdiri dari leusit dan nephelin. gambar 31. a. silikat tetrahedron terdiri dari satu atom silika dikelilingi oleh empat oksigen.

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  • migmatite structures in the central gneiss complex, boca

    boca de quadra, alaska e.l. mclellan, department of geology, universiry of maryland, college park, maryland 20742, usa abstract. migmatite structures in the coast plutonic-metamorphic complex are well exposed in the inlet of boca de quadra, south- east alaska. two types of anatectic migmatites are present. patch migmatites formed by in situ

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  • /i the great alaska earthquake - dtic

    mac's foto shop, anchorage, alaska, is the source for figures 94. 114, 134, 135, 136, 187, 216, 219, and 278. the anchorage daily times is credited with figures 66 and 69.

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  • volcanic activity - kean university

    2 introduction • most of the world's active volcanoes are located around the margin of the pacific ocean. • most active u.s. volcanoes are located in alaska along the northern boundary of the pacific plate. • hawaiian volcanoes are located in the interior of the pacific plate. • magma composition and eruption style differ between volcanoes on plate margins and from the plate interior.

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  • newly located occurrences of lode gold near- alaska dggs

    area of alaska, has produced at least 850,000 oz of gold (bundtzen and others, 1984), all from placer deposits. production has been from four areas (menzie and others, 19831, the majority coming from the circle mining district. during regional geologic studies, which were part of the alaska mineral resource

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