DOCSLIB.ORG

APPENDIX A4.11: Geological Characteristics of the Project Area

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
APPENDIX A4.11: Geological Characteristics of the Project Area APPENDIX A4.11: Geological characteristics of the project area Distance (KP) Geological Period or era Major lithology of primary (upper unit) formation (primary unit) AB mainline Volcanic rocks, predominantly mafic; basalt, trachyte, trachybasalt, trachyandesite, Mafic volcanic Cainozoic leucitite, basanite, nephelinite, limburgite, rock rhyolite, tuff and high level intrusives; rare AB0 to AB28 volcaniclastic sediments. Lithic sandstone, pebbly lithic sandstone, Rewan Group Triassic green to reddish brown mudstone and minor volcanilithic pebble conglomerate (at base). Quartz sandstone, clayey sandstone, Sutton mudstone and conglomerate; fluvial and Cainozoic Formation lacustrine sediments; minor interbedded basalt. Colluvium and/or residual deposits, talus, scree, sheet wash; boulder, gravel, sand; Colluviums Quaternary may include minor alluvial owler sand plain deposits. Lithic sandstone, pebbly lithic sandstone, Rewan Group Triassic green to reddish brown mudstone and minor volcanilithic pebble conglomerate (at base). AB28 to AB74 Channel and flood-plain alluvium; gravel, Alluvium Quaternary sand, silt, clay; may be incised by present day drainage. Ferruginous duricrust, laterite; may include Ferruginous Cainozoic massive to pisolitic ferruginous subsoil, duricrust mottled clays. Volcanic rocks, predominantly mafic; basalt, trachyte, trachybasalt, trachyandesite, Mafic volcanic Cainozoic leucitite, basanite, nephelinite, limburgite, rocks rhyolite, tuff and high level intrusives; rare volcaniclastic sediments. Sandstone, siltstone, shale, mudstone, coal, Blackwater tuff, conglomerate. AB74 to AB93 Late Permian Group Section includes mafic volcanic rocks, Rewan Group, alluvium. Sand plain, may include some residual alluvium; sand dominant, gravel, clay. AB93 to AB142 Sand plain Cainozoic Section includes alluvium, Rewan Group, Blackwater Group, colluviums. Mudstone, sandstone, conglomerate, Duaringa AB142 to AB180 Late Eocene siltstone, oil shale, lignite, basalt. Formation Section includes sandplain, alluvium. Arrow Bowen Pipeline Project Environmental Impact Statement Appendix A.4.11-1 Distance (KP) Geological Period or era Major lithology of primary (upper unit) formation (primary unit) Quartzose to lithic sandstone, siltstone, carbonaceous shale, minor coal and sandy Back Creek AB180 to AB227 Late Permian coquinite Group Section includes sandplain, Duaringa Formation, alluvium. Igneous intermediate volcanic. AB227 to AB261 Trachyte Cainozoic Section includes Duaringa Formation, alluvium, sand plain, Back Creek Group. Basaltic to andesitic lava and volcaniclastic rocks (including breccia and arenite), Lizzie Creek rhyolitic to dacitic lava and volcaniclastic AB261 to AB279 Permian Volcanics rocks (including ignimbrite); local siltstone, shale and polymictic conglomerate. Section includes alluvium, sand plain Siltstone and mudstone, volcanilithic sandstone and conglomerate and minor altered basalt; local rhyolitic to dacitic AB279 to AB307 Carmila beds Early Permian ignimbrite and volcaniclastic rocks. Section includes Back Creek Group, alluvium. Undifferentiated consolidated Cainozoic sedimentary rocks; sandstone, limestone, Sedimentary AB307 to AB313 Cainozoic conglomerate, siltstone commonly rocks ferruginised, silicified or poorly consolidated. Section includes colluviums. Basalt and high-level mafic intrusives, minor Rookwood AB313 to AB316 Early Permian rhyodacite lava, volcaniclastic breccia, lithic Volcanics sandstone, siltstone and mudstone. Dark grey mudstone, siltstone, felsic volcaniclastic sandstone, polymictic conglomerate, ooid-bearing sandstone and Rockhampton Early conglomerate with mudstone rip-up clasts; AB316 to AB234 Group Carboniferous oolitic and pisolitic limestone and minor skeletal limestone; rare rhyolitic ignimbrite. Section includes Rookwood Volcanics, alluvium. Sandstone, siltstone, mudstone, andesitic to dacitic volcanics, volcaniclastic breccia, AB324 to AB328 Craigilee beds Early Devonian limestone, polymictic conglomerate, sparse peperite and andesite to dacite intrusive. Thinly interbedded fine-grained sandstone and siltstone and thick beds of conglomerate Mount Alma Early with andesitic to dacitic clasts and siltstone AB328 to AB348 Formation Carboniferous rip-up-clasts. Section includes Craigilee beds, alluvium, Rockhampton Group. Arrow Bowen Pipeline Project Environmental Impact Statement Appendix A.4.11-2 Distance (KP) Geological Period or era Major lithology of primary (upper unit) formation (primary unit) Grey medium-grained biotite-hornblende to hornblende-biotite granodiorite, grey to Ridgelands cream medium-grained biotite-hornblende AB348 to AB354 Early Triassic Granodiorite tonalite to quartz diorite, locally xenolith- bearing. Section includes alluvium. Thinly interbedded fine-grained sandstone and siltstone and thick beds of conglomerate Mount Alma Early with andesitic to dacitic clasts and siltstone AB354 to AB358 Formation Carboniferous rip-up-clasts. Section includes Ridgelands Granodiorite, alluvium. Alton Downs AB358 to AB360 Late Cretaceous Olivine- and feldspar-phyric basalt. Basalt Rhyolitic and trachytic flows, breccia, ignimbrite and tuff; basalt. Mount Salmon AB360 to AB392 Cretaceous Volcanics Section includes Rockhampton Group, Mount Alma Formation, alluvium, Alton Downs Basalt. Altered grey medium-grained hornblende quartz monzodiorite, dark grey hornblende- Kabra Quartz AB392 to AB396 Triassic augite quartz gabbro, hornblende- Monzodiorite hypersthene-augite-biotite quartz gabbro Section includes alluvium Pale grey medium-grained leucocratic hornblende-biotite tonalite, minor pale pink Bundaleer AB396 to AB411 Early Triassic medium-grained biotite granite. Tonalite Section includes sand plain, alluvium, Rockhampton Group, mafic intrusive. Dolerite, gabbro, diorite. AB411 to AB472 Mafic intrusives Cretaceous Section includes Rockhampton Group, alluvium, Mount Alma Formation. Siltstone, lithofeldspathic sandstone, intermediate to felsic intrusive and extrusive domes, volcanic breccia, minor AB472 to AB477 Berserker Group Permian conglomerates. Section includes alluvium, Rockhampton Group. Elphinstone Lateral Lithic sandstone, pebbly lithic sandstone, green to reddish brown mudstone and minor EL0 to EL11.4 Rewan group Triassic volcanilithic pebble conglomerate (at base). Potential presence of alluvium. EL11.4 to Channel and flood plain alluvium; gravel, Alluvium Quaternary EL12.8 sand, silt, clay. Arrow Bowen Pipeline Project Environmental Impact Statement Appendix A.4.11-3 Distance (KP) Geological Period or era Major lithology of primary (upper unit) formation (primary unit) Undifferentiated consolidated Cainozoic sedimentary rocks; sandstone, limestone, EL12.8 to Sedimentary Cainozoic conglomerate, siltstone; commonly EL23.8 rocks ferruginised, silicified or poorly consolidated. Section includes Rewan group, alluvium. Sand plain may include some residual alluvium; sand dominant, gravel, clay. EL23.8 to EL52 Sand plain Cainozoic Section includes colluviums, Rewan group, alluvium, sedimentary rocks. Saraji Lateral Sand plain, may include some residual Sand plain Cainozoic alluvium; sand dominant, gravel, clay. SL0 to SL26 Channel and flood plain alluvium; gravel, Alluvium Quaternary sand, silt, clay. Dysart Lateral Duaringa Mudstone, sandstone, conglomerate, Middle Eocene DL0 to DL19.7 formation siltstone, oil shale, lignite, basalt. Quaternary Sand plain Sand, silt, gravel and clay. DL19.7 to Blackwater Sandstone, siltstone, shale, mudstone, coal, Late Permian DL21.1 group tuff, conglomerate. Sand plain, may include some residual DL21.1 to DL26 Sand plain Cainozoic alluvium; sand dominant, gravel, clay. Arrow Bowen Pipeline Project Environmental Impact Statement Appendix A.4.11-4 .
Load more

Recommended publications
  • Summary of the Mineral Information Package for the Khanneshin Carbonatite Area of Interest
    Chapter 21A. Summary of the Mineral Information Package for the Khanneshin Carbonatite Area of Interest Contribution by Robert D. Tucker, Harvey E. Belkin, Klaus J. Schulz, Stephen G. Peters, and Kim P. Buttleman Abstract The Khanneshin carbonatite is a deeply dissected igneous complex of Quaternary age that rises approximately 700 meters above the flat-lying Neogene sediments of the Registan Desert, Helmand Province, Afghanistan. The complex consists almost exclusively of carbonate-rich intrusive and extrusive igneous rocks, crudely circular in outline, with only three small hypabyssal plugs of leucite phonolite and leucitite outcropping in the southeastern part of the complex. The complex is broadly divisible into a central intrusive vent (or massif), approximately 4 kilometers in diameter, consisting of coarse-grained sövite and brecciated and agglomeratic barite-ankerite alvikite; a thin marginal zone (less than 1 kilometer wide) of outwardly dipping (5°–45°). Neogene sedimentary strata; and a peripheral apron of volcanic and volcaniclastic strata extending another 3–5 kilometers away from the central intrusive massif. Small satellitic intrusions of biotite-calcite carbonatite, no larger than 400 meters in diameter, crop out on the southern and southeastern margin of the central intrusive massif. In the 1970s several teams of Soviet geologists identified prospective areas of interest for uranium, phosphorus, and light rare earth element (LREE) mineralization in four regions of the carbonatite complex. High uranium concentrations are reported in two regions; the greatest concentrations are confined to silicified shear zones in sandy clay approximately 1.1 kilometers southwest of the peripheral part of the central vent. An area of phosphorus enrichment, primarily occurring in apatite, is present in coarse-grained agglomeratic alvikite, with abundant fenite xenoliths, approximately 750 meters south of the periphery of the central vent.
    [Show full text]
  • The Mineralogy and Chemistry of the Anorogenic Tertiary Silicic Volcanics
    JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 86, NO. Bll, PAGES 10242-10256, NOVEMBER 10, 1981 The Mineralogyand Chemistryof the AnorogenicTertiary SilicicVolcanics of S.E. Queenslandand N.E. New South Wales, Australia A. EWART Departmentof Geology& Mineralogy,University of Queensland,St. Lucia,Brisbane, Queensland 4067 The Late Oligocene-EarlyMiocene volcanismof this regionis chemicallystrongly bimodal; the mafic lavas(volmetrically dominant) comprise basalts, hawaiites, and tholeiiticandesites, while the silicic eruptivesare mainly comendites,potassic trachytes, and potassic,high-silica rhyolites.The comendites and rhyoliteshave distinctivetrace element abundancepatterns, notably the extreme depletionsof Sr, Ba, Mg, Mn, P, Cr, V, and Eu, and the variable em'ichraentof suchelements as Rb, Zr, Pb, Nb, Zn, U, and Th. The trachytesexhibit thesecharacteristics to lesserdegrees. The comenditesare distinguished from the rhyolitesby their overall relative enrichmentof the more highly chargedcations (e.g., LREE, Nb, Y, and especiallyZr) and Zn. The phenocrystmineralogy of the trachytesand rhyolitescomprises various combinationsof the following phases:sodic plagioclase(albite-andesine), calcic anorthoclase, sanidine, quartz, ferroaugite-ferrohedenbergite,ferrohypersthene, fayalitic olivine, ilmenite, titano- magnetite,and rarely biotite (near annite) and Fe-hastingsiticamphibole. Accessories include apatite, zircon, chevkinite (ferrohedenbergite-bearingrhyolites only), and allanite (amphibole and botite rhyo- lites only). The comenditesgenerally contain
    [Show full text]
  • Source to Surface Model of Monogenetic Volcanism: a Critical Review
    Downloaded from http://sp.lyellcollection.org/ by guest on September 28, 2021 Source to surface model of monogenetic volcanism: a critical review I. E. M. SMITH1 &K.NE´ METH2* 1School of Environment, University of Auckland, Auckland, New Zealand 2Volcanic Risk Solutions, Massey University, Palmerston North 4442, New Zealand *Correspondence: [email protected] Abstract: Small-scale volcanic systems are the most widespread type of volcanism on Earth and occur in all of the main tectonic settings. Most commonly, these systems erupt basaltic magmas within a wide compositional range from strongly silica undersaturated to saturated and oversatu- rated; less commonly, the spectrum includes more siliceous compositions. Small-scale volcanic systems are commonly monogenetic in the sense that they are represented at the Earth’s surface by fields of small volcanoes, each the product of a temporally restricted eruption of a composition- ally distinct batch of magma, and this is in contrast to polygenetic systems characterized by rela- tively large edifices built by multiple eruptions over longer periods of time involving magmas with diverse origins. Eruption styles of small-scale volcanoes range from pyroclastic to effusive, and are strongly controlled by the relative influence of the characteristics of the magmatic system and the surface environment. Gold Open Access: This article is published under the terms of the CC-BY 3.0 license. Small-scale basaltic magmatic systems characteris- hazards associated with eruptions, and this is tically occur at the Earth’s surface as fields of small particularly true where volcanic fields are in close monogenetic volcanoes. These volcanoes are the proximity to population centres.
    [Show full text]
  • Hydrovolcanic Vs Magmatic Processes in Forming Maars and Associated Pyroclasts: the Calatrava -Spain- Case History
    1 Hydrovolcanic vs Magmatic Processes in Forming Maars and Associated Pyroclasts: The Calatrava -Spain- Case History F. Stoppa, G. Rosatelli, M. Schiazza and A. Tranquilli Università Gabriele d'Annunzio, Dipartimento di Scienze, Chieti Italy 1. Introduction The Calatrava Volcanic Field (CVF) of Castilla-La Mancha is characterised by numerous monogenetic volcanic centres, that erupted mainly foidites, melilitites and carbonatites (ultra-alkaline rock-association sensu, Le Bas, 1981) carrying abundant mantle xenoliths. At CVF, carbonatites have been described by Bailey et al. (2005) and Stoppa et al. (2011). Along with the volcanic field of Eifel of Germany, Limagne basin of France and Intra-mountain Ultra-alkaline Province (IUP) of Italy, the CVF encompasses the most numerous Pliocene- Quaternary extrusive carbonatites in Western Europe in terms of dimension, number and size of volcanoes (Bailey et al., 2005; Bailey et al., 2006). Similar volcanic fields are Toro- Akole and Bufumbira in Uganda (Bailey & Collier, 2000), the Avon district in Missouri (Callicoat et al., 2008), Mata da Corda in Brazil (Junqueira-Brod et al., 1999) and West Qinling in Gansu Province, China (Yu et al., 2003). In spite of abundant local studies (González Cárdenas et al., 2010; Peinado et al., 2009), the CVF has been mostly neglected by the international audience, although Bailey (2005) outlined the need for a long-term research program on CVF. This work focuses on the role of deep CO2 at CVF, which is considered an intrinsic component of carbonatitic mantle magmatism (Hamilton et al., 1979). Previous, studies of CVF volcanoes considered that the hydrovolcanism is a necessary and sufficient condition to explain the CVF volcanological features, and, as a corollary that the carbonate present in the pyroclastic rocks is remobilised limestones (e.g., López-Ruiz et al., 2002).
    [Show full text]
  • A Simple Classification of Volcanic Rocks Summary Introduction
    A Simple Classification of Volcanic Rocks E. A. K. MIDDLEMOST* Summary There is a considerable volume of information on the abundance, distribu- tion and chemical composition of volcanic rocks. In this paper an attempt is made to use these data to construct a simple chemical classification of the volcanic rocks. Silica content is used to divide the rocks into seven major classes; and the major classes are then subdivided using soda, potash, alumina and lime. Introduction At the present time there is a reawakening of interest in the problem of the classification of igneous rocks (STRECr~ISEN, 1965, 1967; IRVINE and BARAaAR, 1971). Much of this interest has been generated by attempts to use electronic computers to store and manip- ulate large volumes of petrological data (CHAYES, 1969b; HUBAUX, 1969; HARRISON and SABINE, 1970). It has also been shown that it is not possible to devise a single comprehensive classification of igneous rocks that can be used in both the fields of petrography and petro- genesis (MIDDLEMOST, 1971). Petrographic classifications are essentially concerned with producing a systematic framework that provides compartments into which rocks can be placed (i.e. JOHANNSEN, 1931). The needs of petrogenesis are different, as this branch of petrology is constantly searching for ways in which to adapt our vocabulary of rock names so that the language we use is able to change in response to new discoveries, or new ways of interpreting old discoveries. * Dept. of Geology and Geophysics, University of Sydney, NSW, Australia. I -- 383 There is a large store of information on the abundance, composi- tion and distribution of igneous rocks.
    [Show full text]
  • Derivation of Intermediate to Silicic Magma from the Basalt Analyzed at the Vega 2 Landing Site, Venus
    RESEARCH ARTICLE Derivation of intermediate to silicic magma from the basalt analyzed at the Vega 2 landing site, Venus J. Gregory Shellnutt* National Taiwan Normal University, Department of Earth Sciences, Taipei, Taiwan * [email protected] Abstract a1111111111 a1111111111 Geochemical modeling using the basalt composition analyzed at the Vega 2 landing site a1111111111 indicates that intermediate to silicic liquids can be generated by fractional crystallization and a1111111111 equilibrium partial melting. Fractional crystallization modeling using variable pressures (0.01 a1111111111 GPa to 0.5 GPa) and relative oxidation states (FMQ 0 and FMQ -1) of either a wet (H2O = 0.5 wt%) or dry (H2O = 0 wt%) parental magma can yield silicic (SiO2 > 60 wt%) composi- tions that are similar to terrestrial ferroan rhyolite. Hydrous (H2O = 0.5 wt%) partial melting can yield intermediate (trachyandesite to andesite) to silicic (trachydacite) compositions at OPEN ACCESS all pressures but requires relatively high temperatures ( 950ÊC) to generate the initial melt Citation: Shellnutt JG (2018) Derivation of at intermediate to low pressure whereas at high pressure (0.5 GPa) the first melts will be intermediate to silicic magma from the basalt generated at much lower temperatures (< 800ÊC). Anhydrous partial melt modeling yielded analyzed at the Vega 2 landing site, Venus. PLoS mafic (basaltic andesite) and alkaline compositions (trachybasalt) but the temperature ONE 13(3): e0194155. https://doi.org/10.1371/ journal.pone.0194155 required to produce the first liquid is very high ( 1130ÊC). Consequently, anhydrous partial melting is an unlikely process to generate derivative liquids. The modeling results indicate Editor: Axel K Schmitt, Heidelberg University, GERMANY that, under certain conditions, the Vega 2 composition can generate silicic liquids that pro- duce granitic and rhyolitic rocks.
    [Show full text]
  • Chemical and Isotopic Studies of Monogenetic Volcanic Fields: Implications for Petrogenesis and Mantle Source Heterogeneity
    MIAMI UNIVERSITY The Graduate School Certificate for Approving the Dissertation We hereby approve the Dissertation of Christine Rasoazanamparany Candidate for the Degree DOCTOR OF PHILOSOPHY ______________________________________ Elisabeth Widom, Director ______________________________________ William K. Hart, Reader ______________________________________ Mike R. Brudzinski, Reader ______________________________________ Marie-Noelle Guilbaud, Reader ______________________________________ Hong Wang, Graduate School Representative ABSTRACT CHEMICAL AND ISOTOPIC STUDIES OF MONOGENETIC VOLCANIC FIELDS: IMPLICATIONS FOR PETROGENESIS AND MANTLE SOURCE HETEROGENEITY by Christine Rasoazanamparany The primary goal of this dissertation was to investigate the petrogenetic processes operating in young, monogenetic volcanic systems in diverse tectonic settings, through detailed field studies, elemental analysis, and Sr-Nd-Pb-Hf-Os-O isotopic compositions. The targeted study areas include the Lunar Crater Volcanic Field, Nevada, an area of relatively recent volcanism within the Basin and Range province; and the Michoacán and Sierra Chichinautzin Volcanic Fields in the Trans-Mexican Volcanic Belt, which are linked to modern subduction. In these studies, key questions include (1) the role of crustal assimilation vs. mantle source enrichment in producing chemical and isotopic heterogeneity in the eruptive products, (2) the origin of the mantle heterogeneity, and (3) the cause of spatial-temporal variability in the sources of magmatism. In all three studies it was shown that there is significant compositional variability within individual volcanoes and/or across the volcanic field that cannot be attributed to assimilation of crust during magmatic differentiation, but instead is attributed to mantle source heterogeneity. In the first study, which focused on the Lunar Crater Volcanic Field, it was further shown that the mantle heterogeneity is formed by ancient crustal recycling plus contribution from hydrous fluid related to subsequent subduction.
    [Show full text]
  • Rhyolite and Trachyte Formation at Lake City Caldera: Insight from Quantitative Textural and Geochemical Analyses
    Michigan Technological University Digital Commons @ Michigan Tech Dissertations, Master's Theses and Master's Reports 2016 Rhyolite and Trachyte Formation at Lake City Caldera: Insight from Quantitative Textural and Geochemical Analyses Jordan Lubbers Michigan Technological University, [email protected] Copyright 2016 Jordan Lubbers Recommended Citation Lubbers, Jordan, "Rhyolite and Trachyte Formation at Lake City Caldera: Insight from Quantitative Textural and Geochemical Analyses", Open Access Master's Thesis, Michigan Technological University, 2016. https://doi.org/10.37099/mtu.dc.etdr/99 Follow this and additional works at: https://digitalcommons.mtu.edu/etdr Part of the Geochemistry Commons, and the Geology Commons RHYOLITE AND TRACHYTE FORMATION AT LAKE CITY CALDERA: INSIGHT FROM QUANTITATIVE TEXTURAL AND GEOCHEMICAL ANALYSES By Jordan E. Lubbers A THESIS Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE In Geology MICHIGAN TECHNOLOGICAL UNIVERSITY 2016 © 2016 Jordan E. Lubbers This thesis has been approved in partial fulfillment of the requirements for the Degree of MASTER OF SCIENCE in Geology. Geological and Mining Engineering and Sciences ThesisDepartment Advisor: ofChad Deering Committee Member: Olivier Bachmann Committee Member: William Rose Department Chair: John Gierke Table of Contents Acknowledgements ................................................................................................................................................. 6 Abstract ......................................................................................................................................................................
    [Show full text]
  • Basalt-Trachybasalt Samples in Gale Crater, Mars
    Open Research Online The Open University’s repository of research publications and other research outputs Basalt-trachybasalt samples in Gale Crater, Mars Journal Item How to cite: Edwards, Peter H.; Bridges, John C.; Wiens, Roger; Anderson, Ryan; Dyar, Darby; Fisk, Martin; Thompson, Lucy; Gasda, Patrick; Filiberto, Justin; Schwenzer, Susanne P.; Blaney, Diana and Hutchinson, Ian (2017). Basalt- trachybasalt samples in Gale Crater, Mars. Meteoritics & Planetary Science, 52(11) pp. 2391–2410. For guidance on citations see FAQs. c 2017 The Authors Meteoritics Planetary Science https://creativecommons.org/licenses/by-nc-nd/4.0/ Version: Version of Record Link(s) to article on publisher’s website: http://dx.doi.org/doi:10.1111/maps.12953 Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online’s data policy on reuse of materials please consult the policies page. oro.open.ac.uk Meteoritics & Planetary Science 52, Nr 11, 2391–2410 (2017) doi: 10.1111/maps.12953 Basalt–trachybasalt samples in Gale Crater, Mars Peter H. EDWARDS1, John C. BRIDGES 1*, Roger WIENS2, Ryan ANDERSON3, Darby DYAR4, Martin FISK5, Lucy THOMPSON 6, Patrick GASDA2, Justin FILIBERTO7, Susanne P. SCHWENZER8, Diana BLANEY9, and Ian HUTCHINSON1 1Department of Physics and Astronomy, Leicester Institute for Space and Earth Observation, University of Leicester, Leicester LE1 7RH, UK 2Los Alamos National Lab, Los Alamos, New Mexico 87545, USA 3USGS Astrogeology Science
    [Show full text]
  • Lunar Crater Volcanic Field (Reveille and Pancake Ranges, Basin and Range Province, Nevada, USA)
    Research Paper GEOSPHERE Lunar Crater volcanic field (Reveille and Pancake Ranges, Basin and Range Province, Nevada, USA) 1 2,3 4 5 4 5 1 GEOSPHERE; v. 13, no. 2 Greg A. Valentine , Joaquín A. Cortés , Elisabeth Widom , Eugene I. Smith , Christine Rasoazanamparany , Racheal Johnsen , Jason P. Briner , Andrew G. Harp1, and Brent Turrin6 doi:10.1130/GES01428.1 1Department of Geology, 126 Cooke Hall, University at Buffalo, Buffalo, New York 14260, USA 2School of Geosciences, The Grant Institute, The Kings Buildings, James Hutton Road, University of Edinburgh, Edinburgh, EH 3FE, UK 3School of Civil Engineering and Geosciences, Newcastle University, Newcastle, NE1 7RU, UK 31 figures; 3 tables; 3 supplemental files 4Department of Geology and Environmental Earth Science, Shideler Hall, Miami University, Oxford, Ohio 45056, USA 5Department of Geoscience, 4505 S. Maryland Parkway, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA CORRESPONDENCE: gav4@ buffalo .edu 6Department of Earth and Planetary Sciences, 610 Taylor Road, Rutgers University, Piscataway, New Jersey 08854-8066, USA CITATION: Valentine, G.A., Cortés, J.A., Widom, ABSTRACT some of the erupted magmas. The LCVF exhibits clustering in the form of E., Smith, E.I., Rasoazanamparany, C., Johnsen, R., Briner, J.P., Harp, A.G., and Turrin, B., 2017, overlapping and colocated monogenetic volcanoes that were separated by Lunar Crater volcanic field (Reveille and Pancake The Lunar Crater volcanic field (LCVF) in central Nevada (USA) is domi­ variable amounts of time to as much as several hundred thousand years, but Ranges, Basin and Range Province, Nevada, USA): nated by monogenetic mafic volcanoes spanning the late Miocene to Pleisto­ without sustained crustal reservoirs between the episodes.
    [Show full text]
  • The Boring Volcanic Field of the Portland-Vancouver Area, Oregon and Washington: Tectonically Anomalous Forearc Volcanism in an Urban Setting
    Downloaded from fieldguides.gsapubs.org on April 29, 2010 The Geological Society of America Field Guide 15 2009 The Boring Volcanic Field of the Portland-Vancouver area, Oregon and Washington: Tectonically anomalous forearc volcanism in an urban setting Russell C. Evarts U.S. Geological Survey, 345 Middlefi eld Road, Menlo Park, California 94025, USA Richard M. Conrey GeoAnalytical Laboratory, School of Earth and Environmental Sciences, Washington State University, Pullman, Washington 99164, USA Robert J. Fleck Jonathan T. Hagstrum U.S. Geological Survey, 345 Middlefi eld Road, Menlo Park, California 94025, USA ABSTRACT More than 80 small volcanoes are scattered throughout the Portland-Vancouver metropolitan area of northwestern Oregon and southwestern Washington. These vol- canoes constitute the Boring Volcanic Field, which is centered in the Neogene Port- land Basin and merges to the east with coeval volcanic centers of the High Cascade volcanic arc. Although the character of volcanic activity is typical of many mono- genetic volcanic fi elds, its tectonic setting is not, being located in the forearc of the Cascadia subduction system well trenchward of the volcanic-arc axis. The history and petrology of this anomalous volcanic fi eld have been elucidated by a comprehensive program of geologic mapping, geochemistry, 40Ar/39Ar geochronology, and paleomag- netic studies. Volcanism began at 2.6 Ma with eruption of low-K tholeiite and related lavas in the southern part of the Portland Basin. At 1.6 Ma, following a hiatus of ~0.8 m.y., similar lavas erupted a few kilometers to the north, after which volcanism became widely dispersed, compositionally variable, and more or less continuous, with an average recurrence interval of 15,000 yr.
    [Show full text]
  • Th- Ra- Pb Disequilibria. 2 3 Ramananda
    ManuscriptView metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Woods Hole Open Access Server 1 Timescales of Magmatic Processes and Eruption Ages of the Nyiragongo 2 volcanics from 238U-230Th-226Ra-210Pb disequilibria. 3 4 Ramananda Chakrabarti 1#*, Kenneth W. W. Sims2, 3, Asish R. Basu1, Mark Reagan4, 5 Jacques Durieux5 6 7 1. Department of Earth and Environmental Sciences, University of Rochester, 8 Rochester, NY-14627 9 10 2. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, 11 Woods Hole, Massachusetts, MA 02543 12 13 3. Dept of Geology and Geophysics, University of Wyoming, Laramie, WY 82071 14 15 4. Department of Geoscience, University of Iowa, Iowa City, Iowa 52242 16 17 5. Deceased, formerly at Unite De Gestion Des Risques Volcaniques, UNDP / 18 UNOPS, Goma - Nord-Kivu - RD Congo 19 20 # Current address: Department of Earth and Planetary Sciences, Harvard University, 21 Cambridge, MA 02138 22 * Corresponding author - email: [email protected] 23 24 Keywords: Silica-undersaturated volcanism, 238U-230Th-226Ra-210Pb series 25 disequilibria, Magma transport and residence time, Carbonate metasomatism, Volcanic 26 hazard assessment. 27 28 29 Abstract 30 The silica-undersaturated Nyiragongo volcanics, located in the East African rift, have 31 globally unique chemical compositions and unusually low viscosities, only higher than 32 carbonatite lavas, for terrestrial silicate magmas. We report 238U-230Th-226Ra-210Pb series 33 disequilibria in 13 recent and prehistoric lava samples from Nyiragongo including those 34 from the 2002 flank eruption and a 2003 lava lake sample. (230Th/238U) ranges from 0.90- 35 0.97 in the recent lavas and from 0.94-1.09 in the prehistoric lavas.
    [Show full text]