 | | Journal (issue) | | attached to what was then the western edge of the North American continent. The location shown here, along...Baker terranes, east-central Oregon by Charles D. Blome, U.S. Geological Survey, MS 919, Federal Center...British Columbia and northern Washington on the north and northwestern Nevada on the south (Dickinson...displaced from their original site of formation (Blome and others, 1986). Although the terrane concept...terrane (Blome and Nestell, 1991). A complementary study is being prepared by Nestell and Blome on the |  | | Report (issue) | | island-arc terrane that was accreted to ancient North America in the late Mesozoic Era, of a large batholith...Its Late 'Department of Geology, University of North Carolina, Chapel Hill, NC 27599-3315 Manuscript...Mention is made here only of those investigations of North Carolina. This manuscript benefited from that provided...the Wallowa Mountains on Wallowa terrane with the North American continent the southwest flank of Chief...calcarexposed and only slightly recrystallized. In the north- eous siltstone and sandstone. Locally, lithologies |  | Schardt, Christian, Garven, Grant, Kelley, Karen D., Leach, David L. (2008) Reactive flow models of the Anarraaq Zn–Pb–Ag deposit, Red Dog district, Alaska. Mineralium Deposita, 43 (7) 735-757 doi:10.1007/s00126-008-0193-3 | Journal (article/letter/editorial) | | within radiolarite-rich host rocks. Sphalerite and galena concentrations and base metal sulfide distribution...and Economic Geology, RWTH Aachen, Aachen 52064, Germany e-mail: schardt@iml.rwth-aachen.de are primarily...Anchorage Lisburne HillsHerald Arch Thrust Belt North Slope Deformation Front De Long Mountains Lisburne...terrane Endicott Mountains allochthon Schist belt North Slope foreland basin Ruby terrane Picnic Creek...2004). Two tectonic events influenced the north-central and north-western Brooks Range: Mississippian extension |  | | Journal (article/letter/editorial) | | Alaska LORNE E. YOUNG† Consulting Geologist, 12015 North Fairwood Drive, Spokane, Washington 99218 Abstract...Abstract The Brooks Range is a 950-km-long north-vergent fold and thrust belt, which was formed during Mesozoic...extensional sags or half-grabens in the subsurface north of the Brooks Range. Climate, terrestrial ecosystems...physiographic elements (Fig. 1a), from south to north: the Yukon-Koyukuk borderlands, Brooks Range, and...Arctic foothills and Arctic coastal plain of the North Slope (Patton and Box, 1989; Grantz et al., 1990a) |  | | Journal (article/letter/editorial) | | of the deposit (210 to almost 350 m) than to the north and south (maximum of 164 m). The mineralized zone...g/t Ag (King et al., 2002). Barite, sphalerite, galena, and iron sulfides are hosted by the Ikalukrok...accompany the disseminated pyrite. Euhedral cubic galena crystals up to 2 mm in diameter are also locally...found locally within the zones. Sphalerite and/or galena, where present, typically enclose or exist as infillings...and are characterized by laminated sphalerite, galena, and iron sulfide (pyrite and marcasite). In some |  | Kelley, K. D., Wilkinson, J. J., Chapman, J. B., Crowther, H. L., Weiss, D. J. (2009) ZINC ISOTOPES IN SPHALERITE FROM BASE METAL DEPOSITS IN THE RED DOG DISTRICT, NORTHERN ALASKA. Economic Geology, 104 (6) 767-773 doi:10.2113/gsecongeo.104.6.767 | Journal (article/letter/editorial) | | trend of increasing δ66Zn values from south to north (Main-Aqqaluk-Paalaaq-Anarraaq). The δ66Zn values...shale-hosted massive sulfide deposits contain sphalerite, galena, pyrite, and marcasite, with rare chalcopyrite...The dominant mineral is sphalerite with lesser galena, pyrite, marcasite, chalcopyrite, and trace boulangerite;...Local oxidation of Fe sulfides to hematite and galena to anglesite has occurred. Geochemical, fluid inclusion...increasing δ66ZnJMC3-0749L values from south to north (Fig. 3B). Comparison of the Zn isotope results |  | | Journal (article/letter/editorial) | | δ34S(V-CDT) values of pyrite, sphalerite, and galena range from +10.9 to +29.8‰. The highest δ34S values...(extending for several kilometers in the Zarigan and north of the Esfordi areas; Rajabi 2012) suggest that...rhyolitic cryptodome intruded the Dahu Formation in the north of the deposit, and several diabase dikes and sills...data were obtained from pyrite, sphalerite, and galena separates from mineralized drill core samples....banded body of pyrite, sphalerite, and disseminated galena; and (4) distal facies, formed by beds of chert |  | Crowe, Douglas E., Nelson, Steven W., Brown, Philip E., Shanks, Wayne C., Valley, John W. (1992) Geology and geochemistry of volcanogenic massive sulfide deposits and related igneous rocks, Prince William Sound, south-central Alaska. Economic Geology, 87 (7) 1722-1746 doi:10.2113/gsecongeo.87.7.1722 | Journal (article/letter/editorial) | | massivesulfidedeposit,and Plafker et al., 1985; Blome et al., 1990). Both the morerecently,Crowe et al...althoughboth deposittypescontainarsenopyriteand galena,the sediment-hosted depositscontaina much greaterpercentageof...Open-FileRept. OF 89-345, 22 p. VOL., p. 485-627. Blome,C. D., Nelson,S. W., and Karl, S. M., 1990, Accretionary...mineralresources of Alaska,reportonprogress Nelson,S. W., Blome, C. D., Harris, A. H., Reed, K. M., andWilson,F...character,and analysesof tectonostrati- Nelson, S. W., Blome, C. D., and Karl, S. M., 1987a, Late Triassic and |  | | Report (issue) | | deposits of previous eruptions (dark). View of north side of mountain from east on April 18. Center right:...eruption exceeded 550 °C (120 °F). Photograph taken on north side of cone April 27. GEOLOGIC STUDIES IN ALASKA...natural gas hydrate in the Kuparuk 2D-15 well, North Slope, Alaska 24 Timothy S. Collett, Keith A. Kvenvolden...paleoclimate of the Kogosukruk Tongue (Late Cretaceous), North Slope, Alaska 47 Robert A. Spicer and Judith Totman...complex, southern Alaska Steven W. Nelson, Charles D. Blome, and Susan M. Karl 96 Effects of weathering on |  | Morelli, R. M., Creaser, R. A., Selby, D., Kelley, K. D., Leach, D. L., King, A. R. (2004) Re-Os Sulfide Geochronology of the Red Dog Sediment-Hosted Zn-Pb-Ag Deposit, Brooks Range, Alaska. Economic Geology, 99 (7) 1569-1576 doi:10.2113/gsecongeo.99.7.1569 | Journal (article/letter/editorial) | | present in the Red Dog mine area—from south to north—the Qanaiyaq, Main, Aqqaluk, and Paalaaq deposits...orebodies become successively deeper from south to north. The Main deposit is the highest grade of the four...bedded to massive strata-bound lens; sphalerite, galena, and pyrite or marcasite are the dominant sulfide...variations and geochemical zoning from south to north between deposits, Kelley et al. (2004) suggest that...Sphalerite is the most common sulfide mineral; galena and pyrite or marcasite are present in lesser amounts |  | Ayuso, Robert A., Karl, Susan M., Slack, John F., Haeussler, Peter J., Bittenbender, Peter E., Wandless, Gregory A., Colvin, Anna (2005) Oceanic Pb-isotopic sources of proterozoic and paleozoic volcanogenic massive sulfide deposits on Prince of Wales Island and vicinity, southeastern Alaska. Professional Paper Vol. 1732 (1732e) US Geological Survey doi:10.3133/pp1732e | Report (issue) | | signatures were determined on sulfide minerals (galena, pyrite, chalcopyrite, pyrrhotite, and sphalerite)...the region. Except for the Ruby Tuesday deposit, galena is relatively rare in most of these deposits. Pb-isotopic...and oceanic terranes that were accreted to the North American craton from Late Cambrian through Middle...this terrane to the evolution of the west flank of North America (Gehrels and others, 1996). Transportation...through Early Cretaceous along the western margin of North America (Monger and others, 1982; Gehrels and others |  | | Journal (article/letter/editorial) | | the shale-hosted deposits includes sphalerite, galena, pyrite and/or marcasite. Barite is abundant in...but the dominant sulfide mineral is sphalerite; galena, pyrite, and chalcopyrite are present in lesser...(Ellersieck et al., 1982; Kurtak et al., 1995), and galena at the Vidlee occurrence possesses curved crystal...would be reflected in the lead isotope ratios in galena from the vein-breccias. Red Dog District Exploration...analysis of gravity anomalies, and drill indications north of the Main deposit resulted in the discovery of |  | Kelley, K. D., Leach, D. L., Johnson, C. A., Clark, J. L., Fayek, M., Slack, J. F., Anderson, V. M., Ayuso, R. A., Ridley, W. I. (2004) Textural, Compositional, and Sulfur Isotope Variations of Sulfide Minerals in the Red Dog Zn-Pb-Ag Deposits, Brooks Range, Alaska: Implications for Ore Formation. Economic Geology, 99 (7) 1509-1532 doi:10.2113/gsecongeo.99.7.1509 | Journal (article/letter/editorial) | | most likely reflect submicroscopic inclusions of galena, chalcopyrite and/or tetrahedrite in the sphalerite...sphalerite with abundant barite, minor pyrite, and trace galena immediately beneath the sea floor in unconsolidated...deposits is a simple assemblage of barite, sphalerite, galena, pyrite, and marcasite. The textures of the ores...spectrometry Sulfur isotope compositions of pyrite, galena, and sphalerite were measured in situ using a CAMECA...0‰ CDT), Balmat pyrite (14.6‰ CDT), and Balmat galena (15.6‰ CDT) from the Balmat mine, New York (Crowe |  | | Journal (article/letter/editorial) | | pyrrhotite and was found in rocks dominated by galena and sphalerite. The ages the two components are...into its current location relative to the rest of North America and then rotated counterclockwise by 50°...lewchukm@casady.org *Present address: Casady School, 9500 North Pennsylvania Avenue, Oklahoma City, Oklahoma 73120...AL. 160 ° A III Red Dog Mine 50° B tin g north limit of thru s ge Brooks Ran ute Kobu kute...120 I 60° 70° FIG. 1. A. Arctic projection of North America and Asia, showing the proposed Mesozoic |  | Leach, David L., Marsh, Erin, Emsbo, Poul, Rombach, Cameron S., Kelley, Karen D., Anthony, Mike (2004) Nature of Hydrothermal Fluids at the Shale-Hosted Red Dog Zn-Pb-Ag Deposits, Brooks Range, Alaska. Economic Geology, 99 (7) 1449-1480 doi:10.2113/gsecongeo.99.7.1449 | Journal (article/letter/editorial) | | mineralization. Regionally, quartz, sphalerite, pyrite, galena, and chalcopyrite (Meyer et al., 1995; Kelley et...rapid cooling and kilometer-scale erosion of the north-central flank of the Brooks Range was associated...0361-0128/98/000/000-00 $6.00 stage of sphalerite and galena (Kelley et al., 2004b) formed contemporaneously...sediment. However, the main stages of sphalerite, galena, and coarse crystalline barite (Kelley et al.,...deposit, barite and sulfides (pyrite, sphalerite, and galena) extensively replaced carbonate turbidites (Kelley |  | Ayuso, R. A., Kelley, K. D., Leach, D. L., Young, L. E., Slack, J. F., Wandless, J. F., Lyon, A. M., Dillingham, J. L. (2004) Origin of the Red Dog Zn-Pb-Ag Deposits, Brooks Range, Alaska: Evidence from Regional Pb and Sr Isotope Sources. Economic Geology, 99 (7) 1533-1553 doi:10.2113/gsecongeo.99.7.1533 | Journal (article/letter/editorial) | | vein-breccias are found in the Endicott Group. Galena formed during the main mineralization stages in...to 15.621, and 208Pb/204Pb = 38.083 to 38.323. Galena and sphalerite formed during the main ore-forming...significantly disturb the isotopic compositions of galena and sphalerite after the main mineralization event...variability of the hydrothermal fluids, as represented by galena in the Red Dog district, appears to be consistent...a simple mixing system. Evidence indicates that galena was deposited from largely similar hydrothermal |  | Graham, Garth E., Deszcz-Pan, Maria, Abraham, Jared E., Kelley, Karen D. (2011) Investigation of the potential for concealed base-metal mineralization at the Drenchwater Creek Zn-Pb-Ag occurrence, northern Alaska, using geology, reconnaissance geochemistry, and airborne electromagnetic geophysics. Professional Paper Vol. 1784 (1784b) US Geological Survey doi:10.3133/pp1784b | Report (issue) | | quadrangle, within the NPRA. It is approximately 7 km north of the Brooks Range crest (1,000–1,400 m elevation)...southern part of the study area to about 100 m in the north, and it becomes essentially flat 6.5 km northeast...Drenchwater Creek Geology The northern Brooks Range is a north-vergent fold and thrust belt with a complex history...False Wager Creek—two in the DWTP and one to the north in the TCTP (Werdon, 1996). Stratigraphically higher...fenster into five east-west striking thrust plates (north to south): Mother Bear (MBTP), Two Cubs (TCTP), |  | Kelley, Karen D., Selby, David, Falck, Hendrik, Slack, John F. (2017) Re-Os systematics and age of pyrite associated with stratiform Zn-Pb mineralization in the Howards Pass district, Yukon and Northwest Territories, Canada. Mineralium Deposita, 52 (3) 317-335 doi:10.1007/s00126-016-0663-y | Journal (article/letter/editorial) | | include (a) fine-scale laminations of sphalerite, galena, and pyrite from <0.05 mm to 1 cm thick, interbedded...precipitation (and by inference, sphalerite and galena) occurred during the early Silurian, consistent... Miner Deposita minerals include sphalerite, galena, and minor pyrite; chalcopyrite is rare. Collectively...al. (2012) Northwest Territories Yukon Pelly North BC Northwest Territories OP West OP ANNIV West...eastward docking of allochthonous terranes against the North American continent (Gordey and Anderson 1993; Mair |  | | Report (issue) | | Effect on Faunal Content and Biozonal Correlation BLOME, C.D., AND REED, K.M. ...................... 11...River Member showed that basin-axis streams flowed north-northwest through the geographic center of the basin...coarse-grained pyrite, lesser amounts of sphalerite and galena, and micron-sized particles that contain various...epithermal gold deposits in the Carlin trend of north-central Nevada. Spore counts of Bacillus cereus...and 40 km long, which is underlain both on the north and south by gneissic basement of the Guayana Shield |  | Slack, J. F., Kelley, K. D., Anderson, V. M., Clark, J. L., Ayuso, R. A. (2004) Multistage Hydrothermal Silicification and Fe-Tl-As-Sb-Ge-REE Enrichment in the Red Dog Zn-Pb-Ag District, Northern Alaska: Geochemistry, Origin, and Exploration Applications. Economic Geology, 99 (7) 1481-1508 doi:10.2113/gsecongeo.99.7.1481 | Journal (article/letter/editorial) | | deposit, wall rocks without visible sphalerite or galena (<300 ppm Zn + Pb) have anomalous Eu/Eu*, Tl, Sb...Hilltop) to the south and Aqqaluk and Paalaaq to the north (Fig. 2). Throughout this paper, the term “Red Dog...1990; Pigage, 1990), the Rammelsberg deposit in Germany (Brockamp and Renner, 1988; Sperling and Walcher...in the district consists mainly of sphalerite, galena, and lesser iron sulfides (pyrite ± marcasite)...Red Dog deposits to locally layered at Anarraaq. Galena is present generally as disseminations or in thin |  | | Journal (article/letter/editorial) | | Mountains of northwestern Alaska, approximately 135 km north of Kotzebue (Fig. 1). They consist of ZnPb-Ag (±...159o 100 Km 156o 153o Barrow Beaufort Sea North Slope Chukchi Sea o 69 Figure 2 De Lo ng Mts...Spanning northern Alaska, the Brooks Range is a north-directed fold and thrust belt consisting of a thin...(Angayucham terrane) and folded sedimentary rocks in the north (Arctic Alaska terrane) that has had a long, episodic...and metamorphic grade generally decreases to the north from high-pressure–low-temperature blueschist facies |  | | Report (issue) | | mineralized deposits may occur nearby. The ridge is north of the Arctic Circle and tree line and, like most...complex of GUlkana River, and Wrangellia terrane, north-central and northwestern Gulkana quadrangle, ~Warren...area of the Alaska Peninsula. 19. Photograph of north shore of Hallo Bay, showing coquina horizon and...each of six regional subdivisions of Alaska fran north to south. The subdivisions of Alaska are shown in...depositional history of Jurassic and Cretaceous sequences, North Slope Reservoir characteristics of the Lisburne |  | Miller, Lance J., Goldfarb, Richard J., Snee, Lawrence W., Gent, Carol A., Kirkham, Richard A. (1995) Structural geology, age, and mechanisms of gold vein formation at the Kensington and Jualin deposits, Berners Bay District, Southeast Alaska. Economic Geology, 90 (2) 343-368 doi:10.2113/gsecongeo.90.2.343 | Journal (article/letter/editorial) | | Alaska99801 Abstract The BernersBaydistrictat the north end of the Juneaugoldbelt, southeastAlaska,containsa...formation. Mostof the vein depositsare controlledby north-to northwest-striking andsteeplyeast-dipping shearzones...Three setsof auriferousnetworkveinsstriketo the north anddip moderatelyto shallowlyeastandwest.Individualveinsrangefrom...KensingtonandJualindepositsin BernersBay on the north (Fig. 1). Nearly 7 Moz of gold have been producedfrom...JualinDiorite and, rarely, adjacent metabasalticrocks.From north to south,significantdevelopment has historically |  | Slack, John F., Shanks, Wayne C., Karl, Susan M., Gemery, Pamela A., Bittenbender, Peter E., Ridley, W. Ian (2007) Geochemical and Sulfur-Isotopic Signatures of Volcanogenic Massive Sulfide Deposits on Prince of Wales Island and Vicinity, Southeastern Alaska. Professional Paper Vol. 1732 (1732c) US Geological Survey doi:10.3133/pp1732c | Report (issue) | | discontinuously from northwest of Haines in the north to Prince of Wales Island in the south (Newberry...Lake; HZ, Hozer; KI, Keete Inlet; KIN, Keete Inlet North; KY, Khayyam; LO, Lookout Mountain; LP, Lime Point...NB, Nichols Bay; NKM, Nutkwa Main; NKN, Nutkwa North; NL, Niblack; RL, Rock Lake; RTF, Ruby Tuesday (Fish...record transform faulting between the Pacific and North American Plates, after Jurassic through Cretaceous...deposit (NL, fig. 1), in the Moira Sound unit on the north side of Moira Sound, was mined from 1902 to 1908 |  | | Journal (article/letter/editorial) | | significant VMS deposit in Alaska and the largest in North America, respectively. The occurrences are hosted...Valu Fa Ridge to the Taupo volcanic zone of the North Island, New Zealand. 1997, 1999; Newberry et al...15 = Hamilton Island, 16 = North Shore, 17 = Cave Mountain Point, 18 = North Gambier, 19 = Yellow Bear...Goodfellow et al., 1993) genetic models. From south to north, they occur from the islands west of Ketchikan (Fig...Alexander Triassic metallogenic belt. From south to north, a distinct variation in host rock lithology is |
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