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Open-File Report 2005-1235
Prepared in cooperation with the Idaho Geological Survey and the Montana Bureau of Mines and Geology Spatial databases for the geology of the Northern Rocky Mountains - Idaho, Montana, and Washington By Michael L. Zientek, Pamela Dunlap Derkey, Robert J. Miller, J. Douglas Causey, Arthur A. Bookstrom, Mary H. Carlson, Gregory N. Green, Thomas P. Frost, David E. Boleneus, Karl V. Evans, Bradley S. Van Gosen, Anna B. Wilson, Jeremy C. Larsen, Helen Z. Kayser, William N. Kelley, and Kenneth C. Assmus Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government Open-File Report 2005-1235 U.S. Department of the Interior U.S. Geological Survey U.S. Department of the Interior Gale A. Norton, Secretary U.S. Geological Survey P. Patrick Leahy, Acting Director U.S. Geological Survey, Reston, Virginia 2005 For product and ordering information: World Wide Web: http://www.usgs.gov/pubprod Telephone: 1-888-ASK-USGS For more information on the USGS—the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment: World Wide Web: http://www.usgs.gov Telephone: 1-888-ASK-USGS Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report. Contents Abstract .......................................................................................................................................................... 1 Introduction -
Petrography and Physicomechanical Properties of Rocks from the Ambela Granitic Complex, NW Pakistan
Hindawi Publishing Corporation The Scientific World Journal Volume 2013, Article ID 349381, 8 pages http://dx.doi.org/10.1155/2013/349381 Research Article Petrography and Physicomechanical Properties of Rocks from the Ambela Granitic Complex, NW Pakistan Mohammad Arif,1 S. Wajid Hanif Bukhari,2 Noor Muhammad,3 and Muhammad Sajid1 1 Department of Geology, University of Peshawar, Peshawar 25120, Pakistan 2 Centre of Excellence in Mineralogy, University of Balochistan, Quetta 87300, Pakistan 3 Department of Mining Engineering, NWFP University of Engineering and Technology, Peshawar 25120, Pakistan Correspondence should be addressed to Mohammad Arif; arif [email protected] Received 17 April 2013; Accepted 11 May 2013 Academic Editors: M. Gregoire,N.Hirao,J.A.Morales,L.Tosi,andJ.Yvon´ Copyright © 2013 Mohammad Arif et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Petrography and physicomechanical properties of alkali granites, alkali quartz syenite, and nepheline syenite from Ambela, NW Pakistan, have been investigated. Whereas the alkali quartz syenite and most of the alkali granites are megaporphyritic, the nepheline syenite and some of the alkali granites are microporphyritic. Their phenocryst shape and size and abundance of groundmass are also different. The values of unconfined compressive strength (UCS) are the lowest and highest for megaporphyritic alkali granite and alkali quartz syenite, respectively. However, all the four rock types are moderately strong. Correspondingly, their specific gravity and water absorption values are within the permissible range for use as construction material. The UCS for the alkali quartz syenite is the highest, most probably because (i) it has roughly equal amounts of phenocryst and groundmass, (ii) it displays maximum size contrast between phenocryst and groundmass, (iii) its phenocrysts are highly irregular, and (iv) it contains substantial amounts of quartz. -
Formation of the Yosemite Creek Granodiorite: a Field and Geochemical Study
Formation of the Yosemite Creek Granodiorite: a field and geochemical study 14 12 10 8 6 4 15 2 14 phonolite0 13 40 50 60 70 80 12 tephri- trachyte (q<20%) phonolite 11 trachydacite (q>20%) foidite 10 phono- tephrite trachy- 9 andesite rhyolite 8 tephrite ba sa ltic (ol<10%) trachy- 7 andesite basanite trachy- 6 (ol>10%) basalt 5 4 dacite 3 asalt andesite b ba sa ltic 2 picro- andesite basalt 1 0 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 1000 syn-COLG WPG 100 10 VAG 250 1 200 1 10 100 1000 150 100 50 0 0 500 1000 1500 2000 by Erik Bliekendaal Master of Science Thesis Solid Earth Vrije Universiteit Amsterdam 2012 [..] Preface My personal interests in geology developed towards the debate of crust-mantle differentiation during my master. The processes involved in crust-mantle differentiation makes the Earth as it is nowadays. The scale of this phenomena exceed all human proportions with a time-scale that spans the complete history of Earth and will continue far into the future. Length and depth scales of the crust-mantle processes are immense with respect to human proportions. I feel it to be a honour to work with and attribute to such a important and interesting subject. The scientific debate is firm and spreads over a numerous geological disciplines. In my opinion the most interesting of these disciplines are the petrology and geochemistry. Especially the debate with respect to these disciplines is heated and firm due to new geochemical analytical techniques. -
Igneous Rocks: a Classification and Glossary of Terms
This page intentionally left blank IGNEOUS ROCKS: A CLASSIFICATION AND GLOSSARY OF TERMS Decades of field and microscope studies and more recent quantitative geo- chemical analyses have resulted in a vast, and sometimes overwhelming, array of nomenclature and terminology associated with igneous rocks. Under the auspices of the International Union of Geological Sciences (IUGS), a group of petrologists from around the world has laboured for more than 30 years to collate these terms, gain international agreement on their usage, and reassess the methods by which we categorize and name igneous rocks. This book presents the results of their work and gives a complete classifi- cation of igneous rocks based on all the recommendations of the IUGS Sub- commission on the Systematics of Igneous Rocks. Revised from the 1st edition (1989), it shows how igneous rocks can be distinguished in the sequence of pyroclastic rocks, carbonatites, melilite-bearing rocks, kalsilite-bearing rocks, kimberlites, lamproites, leucite-bearing rocks, lamprophyres and charnockites. It also demonstrates how the more common plutonic and volcanic rocks that remain can then be categorized using the familiar and widely accepted modal QAPF and chemical TAS classification systems. The glossary of igneous terms has been fully updated since the 1st edition and now includes 1637 entries, of which 316 are recommended by the Subcommission, 312 are regarded as local terms, and 413 are now considered obsolete. Incorporating a comprehensive list of source references for all the terms included in the glossary, this book will be an indispensable reference guide for all geologists studying igneous rocks, either in the field or the laboratory. -
GY303 Igneous & Metamorphic Petrology
GY303GY303 IgneousIgneous && MetamorphicMetamorphic PetrologyPetrology LabLab LabLab 1:1: FelsicFelsic IgneousIgneous RockRock TermsTerms && ClassificationClassification ColorColor IndexIndex Felsic: refers to igneous rocks where light colored minerals dominate. Remember that red (even dark red) is considered to be a “felsic” light color. The most common felsic example is Granite. Intermediate: refers toto igneousigneous rocksrocks wherewhere thethe proportionsproportions ofof light and dark minerals are roughly equal. Remember that green (even light green) is considered to be a “dark” color. An intermediate example is Diorite. Mafic: refers to igneous rocks that are dominated by dark colored minerals (including any green colors). A mafic example is Gabbro. Ultramafic: refers to igneous rocks that are dominated by dark colored minerals but have no significant proportions of feldspar. A ultramafic example is Peridotite. TexturalTextural DescriptiveDescriptive TermsTerms DegreeDegree ofof CrystallinityCrystallinity HolocrystallineHolocrystalline:: composedcomposed ofof crystalcrystal grainsgrains HypocrystallineHypocrystalline:: mixturemixture ofof glassglass andand crystalscrystals HolohyalineHolohyaline:: essentiallyessentially allall glassyglassy materialmaterial (pumice,(pumice, ash,ash, obsidian)obsidian) NoteNote thatthat allall glassyglassy materialmaterial willwill revertrevert toto ((devitrifydevitrify)) toto veryvery finefine--grainedgrained crystallinecrystalline materialmaterial overover aa periodperiod ofof 100,000100,000 -
Classification of Igneous Rocks
BRITISH GEOLOGICAL SURVEY RESEARCH REPORT NUMBER RR 99–06 BGS Rock Classification Scheme Volume 1 Classification of igneous rocks M R Gillespie and M T Styles Subject index Rock classification, igneous rocks Bibliographical Reference Gillespie, M R, and Styles, M T. 1999. BGS Rock Classification Scheme Volume 1 Classification of igneous rocks. British Geological Survey Research Report, (2nd edition) RR 99–06. © NERC Copyright 1999 British Geological Survey Keyworth Nottingham NG12 5GG UK HOW TO NAVIGATE THIS DOCUMENT HOW TO NAVIGATE THIS DOCUMENT ❑ The general pagination is designed for hard copy use and does not correspond to PDF thumbnail pagination. ❑ The main elements of the table of contents are bookmarked enabling direct links to be followed to the principal section headings and sub-headings, figures and tables irrespective of which part of the document the user is viewing. ❑ In addition, the report contains links: ✤ from the principal section and sub-section headings back to the contents page, ✤ from each reference to a figure or table directly to the corresponding figure or table, ✤ from each figure or table caption to the first place that figure or table is mentioned in the text and ✤ from each page number back to the contents page. Return to contents page Contents 1 Introduction 6.2 Melilitic rocks 1.1 Principles behind the classification scheme 6.2.1 Classification of ultramafic melilitic rocks 1.2 Changes to the IUGS recommendations 6.2.2 Non-ultramafic rocks containing melilite 1.3 Using the hierarchy 6.3 Kalsilitic rocks -
Map Analysis of Fogo, Cape Verde
Självständigt arbete Nr 86 Map analysis of Fogo, Cape Verde Olle Risby & Björn Sandback Map analysis of Fogo, Cape Verde This bachelor thesis has been produced as a project preparation for an MFS project during the autumn of 2014 on Fogo, Cape Verde. The long term aim for the MFS project is to conduct a geological survey on Fogo, gather geological information and assess the magma storage depth for future geothermal applications. Understanding the mechanisms of ocean island volcanism, magma feeding behavior and requirements for geothermal energy is essential for the future survey. Previous geological surveys done on Fogo are few in numbers and are Olle Risby & Björn Sandback primarily focused on slope stability, volcanic features or geophysical surveys, focusing on mantle plume depth. By describing rock samples from Fogo and understanding what environment the rock samples have formed in, a more accurate description of the volcanism at present can be produced. For this project we described 11 rock samples and 9 thin sections from Fogo, in terms of the samples; mineralogical composition, colour, structure, texture, matrix, phenocrysts and alteration features. By merging the rock descriptions with a previously produced geological map, we produced two digital maps with geological information. One displays Fogo on a larger scale with correlated localities of representative rock samples. The maps will be used during the field work during 2014 when additional implementations to the maps will be made. Uppsala universitet, Institutionen för geovetenskaper Kandidatexamen i Geovetenskap, 180 hp Självständigt arbete i geovetenskap, 15 hp Tryckt hos Institutionen för geovetenskaper Geotryckeriet, Uppsala universitet, Uppsala, 2014. -
Genesis of Precious Metal Mineralization in Intrusions of Ultramafic, Alkaline Rocks and Carbonatites in the North of the Siberian Platform
minerals Article Genesis of Precious Metal Mineralization in Intrusions of Ultramafic, Alkaline Rocks and Carbonatites in the North of the Siberian Platform Anatoly M. Sazonov 1,*, Aleksei E. Romanovsky 1, Igor F. Gertner 2, Elena A. Zvyagina 1, Tatyana S. Krasnova 2, Oleg M. Grinev 2 , Sergey A. Silyanov 1 and Yurii V. Kolmakov 3 1 Department of Geology, Mineralogy and Petrography, Siberian Federal University, 660041 Krasnoyarsk, Russia; [email protected] (A.E.R.); [email protected] (E.A.Z.); [email protected] (S.A.S.) 2 Department of Geology and Geography, Tomsk State University, 634050 Tomsk, Russia; [email protected] (I.F.G.); [email protected] (T.S.K.); [email protected] (O.M.G.) 3 Department of Geology and Geophysics, Tomsk Polytechnic University, 634050 Tomsk, Russia; [email protected] * Correspondence: [email protected]; Tel.: +7-(902)-923-51-77 Abstract: The gold and platinum-group elements (PGE) mineralization of the Guli and Kresty intrusions was formed in the process of polyphase magmatism of the central type during the Permian and Triassic age. It is suggested that native osmium and iridium crystal nuclei were formed in the mantle at earlier high-temperature events of magma generation of the mantle substratum in Citation: Sazonov, A.M.; the interval of 765–545 Ma and were brought by meimechite melts to the area of development of Romanovsky, A.E.; Gertner, I.F.; magmatic bodies. The pulsating magmatism of the later phases assisted in particle enlargement. Zvyagina, E.A.; Krasnova, T.S.; Native gold was crystallized at a temperature of 415–200 ◦C at the hydrothermal-metasomatic stages Grinev, O.M.; Silyanov, S.A.; Kolmakov, Y.V. -
Package 'Gcdkit'
Package ‘GCDkit’ August 16, 2019 Version 6.0 Date 2019-08-16 Title Geochemical Data Toolkit for Windows Author Vojtech Janousek <[email protected]> Colin Farrow <[email protected]> Vojtech Erban <[email protected]> Jean-Francois Moyen <[email protected]> Maintainer Vojtech Janousek <[email protected]> Depends R (>= 3.6.0),tcltk Imports stats, methods, utils, graphics, grDevices, MASS, grid, lattice, for- eign, RODBC, R2HTML, sp, compiler Suggests XML, rgdal, tkrplot, curl Description A program for recalculation of geochemical data from igneous and metamorphic rocks. With complete graphical user interface (GUI) it runs under Windows Vista/7/8/10, complete functionality/stability under 2000/XP cannot be guaranteed. The current ver- sion should also work on Mac OS X (release 10.6 and above) and various distributions of Linux (Debian, Red- Hat, SUSE, Ubuntu). License GPL (>= 2) URL http://www.gcdkit.org R topics documented: .claslist . .6 about . .6 accessVar . .7 Add contours . .8 addResults . .9 addResultsIso . .9 AFM............................................. 10 ageEps . 12 Agrawal . 14 Ague............................................. 16 appendSingle . 18 apSaturation . 19 1 2 R topics documented: ArcMapSetup . 21 assign1col . 22 assign1symb . 23 assignColLab . 24 assignColVar . 25 assignSymbGroup . 26 assignSymbLab . 27 assignSymbLett . 28 atacazo . 29 Batchelor . 30 binary . 32 binaryBoxplot . 33 blatna . 35 Boolean conditions . 35 bpplot2 . 37 Cabanis . 38 calc ............................................. 40 calcAnomaly . 41 calcCore . 43 Catanorm . 44 CIPW............................................ 45 classify . 47 clr.transform . 49 cluster . 51 contourGroups . 52 coplotByGroup . 54 coplotTri . 56 correlationCoefPlot . 58 Cox ............................................. 59 crosstab . 62 customScript . 63 cutMy . 64 Debon . 65 DebonBMgNo . 67 DebonBQF . 69 DebonKNaB . 71 DebonQB . 73 deleteSingle . 74 EarthChem . 75 Edit labels . -
Mineralogical and Geochemical Constraints on the Origin and Late
Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 27 September 2018 doi:10.20944/preprints201809.0551.v1 Peer-reviewed version available at Minerals 2018, 8, 537; doi:10.3390/min8110537 Article Mineralogical and Geochemical Constraints on the Origin and Late-Stage Crystallization History of the Breivikbotn Silicocarbonatite, Seiland Igneous Province in Northern Norway: Prerequisites for Zeolite Deposits in Carbonatite Complexes Dmitry R. Zozulya 1,*, Kåre Kullerud 2,3, Erling K. Ravna 2, Yevgeny E. Savchenko 1, Ekaterina A. Selivanova 1 and Marina G. Timofeeva 1 1 Geological Institute, Kola Science Centre, 14 Fersman Str, 184209 Apatity, Russia 2 Department of Geology, University of Tromsø, N-9037 Tromsø, Norway 3 Norwegian Mining Museum, N-3616 Kongsberg, Norway * Correspondence: [email protected]; Tel.: +7-81555-79742 Abstract: The present work reports new mineralogical and whole rock geochemical data from the Breivikbotn silicocarbonatite (Seiland igneous province, North Norway), allowing conclusions to be drawn concerning its origin and the role of late fluid alteration. The rock shows a rare mineral association: calcite + pyroxene + amphibole + zeolite group minerals + garnet + titanite, with apatite, allanite, magnetite and zircon as minor and accessory minerals, and it is classified as silicocarbonatite. Calcite, titanite and pyroxene (Di36-46 Acm22-37 Hd14-21) are primarily magmatic minerals. Amphibole of hastingsitic composition has formed after pyroxene at a late-magmatic stage. Zeolite group minerals (natrolite, gonnardite, Sr-rich thomsonite-(Ca)) were formed during hydrothermal alteration of primary nepheline by fluids/solutions with high Si-Al-Ca activities. Poikilitic garnet (Ti-bearing andradite) has inclusions of all primary minerals, amphibole and zeolites, and presumably crystallized metasomatically during a late metamorphic event (Caledonian orogeny). -
Naming Materials in the Magma/Igneous Rock System
EARTH SCIENCE REVIEWS ELSEVIER Earth-Science Reviews 37 (1994) 215-224 Naming materials in the magma/igneous rock system Eric A.K. Middlemost Department of Geology and Geophysics, Unit,ersity of Sydney, NSW 2006, Australia Received 22 June, 1993; revised and accepted 25 August, 1994 Abstract The main aim of igneous petrology is to develop a complete specification of the magma/igneous rock system. This paper is a sequel to an earlier essay (Middlemost, 1991) on the classification of igneous rocks and magmas. It explores the ways and means of developing a single, consistent method of naming all igneous materials. All modal classifications are fettered by problems arising from heteromorphism, extremes in grain size, and the presence of glass. Only chemical parameters can provide a reliable and straightforward method of classifying all the common igneous rocks and their magmas. This is undoubtedly true of glassy rocks and magmas. The potential of the TAS diagram in this new and enlarged role is evaluated, resulting in a modification of some boundaries recommended for the volcanic rocks. A new comprehensive chemical classification of the plutonic rocks is introduced. To keep it and the volcanic classification in tandem, several new terms are proposed. They include gabbroic diorite as a plutonic equivalent of basaltic andesite and peridotgabbro as a plutonic equivalent of picrobasalt. Peridotite is defined as the plutonic equivalent of picrite and by taking the idea of equivalence a step further, it is defined as a peridotgabbroic or gabbroic rock that contains more than 18% MgO and less than 2% total alkalis. The picrobasaltic and basaltic rocks that contained more than 18% MgO and more than 2% (Na20 + K20) are called alkalic picrites. -
Nepheline.Rich Foidolites and Rare.Earth Mineralization
Canadian Mineralogist Vol. 29, pp. 319-336(1991) NEPHELINE.RICHFOIDOLITES AND RARE.EARTHMINERALIZATION IN THE EL PICACHOTERTIARV INTRUSIVE COMPLEX, SIERRADE TAMAULIPAS, NORTHEASTERNMEXICO MARIANO ELIAS.HERRERA,RAUL RUBINOVICH-KOGAN, RUFINOLOZANO-SANTA CRUZ ANDJOSE LUIS SANCHEZ.ZAYALA Instituto de Geologfa, Universidad Nocional Autdnoma de Mdxico, Ciudad Universitaria, Delegacidn Coyoacdn, M510 Mdxico, D.F., Mdxico ABSTRACT suresriches en apatite et enrichiesen terresrares. Cesfoido- lites contiennent n6phdline (55-9190), pyroxEne (entre The El PicachoTertiary intrusivecomplex is locatedin Di36Hd3eAe25et Dit8Hd3zAe45)(4-3590), et orthoclase the west-centralpart of the Sierra de Tamaulipas,in the (0-220/o).Ce sont desroches sous-satur6es en silice(44-50q0 alkaline province of northeastMexico. The complexcuts de SiO2 en poids) qui sont fortement hyperalcalines Cretaceouslimestone, and it consistsof gabbro, kaersu- (11-1590 de Na2O + K2O) et d faibles teneus en Mg tite diorite, syenite, nepheline-richfoidolites (ijolite, urtite, (l-490 MgO), et qui correspondraiente destermes 6volu6s juvite), and trachytic and phonolitic dikes.The nepheline- d'une s€rie fractionnde d partir d'un parent aussi sous- rich foidolites are affected by alkali metasomatismand con- satur6. La metasomatosea donnd des f6nites d aegyrine tain apatite-rich veins enriched in the rare-earth elements. l6gdrement hyperalcalines, qui contiennent albite, The nepheline-richfoidolites consistof nepheline(55-91 9o), orthoclase, cancrinite en pseudomorphosede la n€ph61ine, pyroxene (4-35V0)(Di36Hd3eAe25 to Dil8Hd37Ae45)and et un pyroxbne sodique (entre Di14Hd21Ae5set' orthoclase(0-22V0), They are silica-undersaturatedrocks DilHd27Ae7r. Nous trouvons aussides fdnites leucocrates, (44-50 wt.olo SiOt with a strongly alkaline character i onhoclase + albite, avecde faiblesquantites de quartz, (11-15wt.9o Na2O + K2O)and low contentsof Mg (l-4 interstitiel.