Conference on Micro-Raman and Luminescence Studies in the Earth and Planetary Sciences (Corals Ii)

Total Page:16

File Type:pdf, Size:1020Kb

Conference on Micro-Raman and Luminescence Studies in the Earth and Planetary Sciences (Corals Ii) Program and Abstract Volume LPI Contribution No. 1616 CONFERENCE ON MICRO-RAMAN AND LUMINESCENCE STUDIES IN THE EARTH AND PLANETARY SCIENCES (CORALS II) May 18–20, 2011 • Madrid, Spain Sponsors Spanish National Research Council Lunar and Planetary Institute Scientific Organizing Committee Javier Garcia-Guinea (Chair), Museo Nacional de Ciencias Naturales (MMCN) Virgilio Correcher (Co-Chair), CIEMAT Sergio Sanchez-Moral, MNCN, CSIC Soledad Cuezva, MNCN, CSIC Angel Fernandez-Cortes, MNCN, CSIC Elena Garcia Anton, MNCN, CSIC Laura Tormo, MNCN, CSIC Marta Furio, MNCN, CSIC Alberto Jorge, MNCN, CSIC Sagrario Martinez-Ramirez, IEM, CSIC Santiago Sanchez Cortes, IEM, CSIC Ana Cremades, Univ. Complutense Javier Ruiz, Univ. Complutense Elena Crespo-Feo, Univ. Complutense Susana Jorge-Villar, Univ. Burgos Miguel De la Guardia, Univ. Valencia Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058-1113 LPI Contribution No. 1616 Compiled in 2011 by Meeting and Publication Services Lunar and Planetary Institute USRA–Houston 3600 Bay Area Boulevard, Houston TX 77058-1113 The Lunar and Planetary Institute is operated by the Universities Space Research Association under a cooperative agreement with the Science Mission Directorate of the National Aeronautics and Space Administration. Any opinions, findings, and conclusions or recommendations expressed in this volume are those of the author(s) and do not necessarily reflect the views of the National Aeronautics and Space Administration. Material in this volume may be copied without restraint for library, abstract service, education, or personal research purposes; however, republication of any paper or portion thereof requires the written permission of the authors as well as the appropriate acknowledgment of this publication. Abstracts in this volume may be cited as Author A. B. (2011) Title of abstract. In Conference on Micro-Raman and Luminescence Studies in the Earth and Planetary Sciences (CORALS II), p. XX. LPI Contribution No. 1616, Lunar and Planetary Institute, Houston. ISSN No. 0161-5297 Preface This volume contains abstracts that have been accepted for presentation at the Conference on Micro-Raman and Luminescence Studies in the Earth and Planetary Sciences, May 18–20, 2011, Madrid, Spain. Administration and publications support for this meeting were provided by the staff of the Meeting and Publication Services Department at USRA’s Lunar and Planetary Institute. CORALS II Conference v Contents Program.........................................................................................................................................................xi Cathodoluminescence and Raman Spectroscopic Characterization of Phosphates in Mexican Chondrites L. A. Alba-Aldave, J. García-Guinea, M. Furio, and A. Jorge-García.............................................. 1 On the Reliable Structural Characterization of Polished Carbons in Meteorites by Raman Microspectroscopy M. R. Ammar, J.-N. Rouzaud, E. Charon, J. Aleon, G. Guimbretière, and P. Simon........................................................................................................ 2 CL-Spectral Characteristics of Quartz and Feldspars in Fresh and Hydrothermal Altered Volcanic Rocks (Cabo de Gata, Almeria, Spain) A. Aparicio and M. A. Bustillo........................................................................................................... 3 The Consequences of the Presence of Urban Atmospheric Particles and Airbornes in CorTen® Steel Surfaces J. Aramendia, L. Gómez-Nubla, K. Castro, I. Martínez-Arkarazo, G. Arana, and J. M. Madariaga........................................................................................................ 4 New Findings by Raman Microespectroscopy of Inclusions Inside a Libyan Desert Glass J. Aramendia, L. Gómez-Nubla, S. Fdez-Ortiz de Vallejuelo, K. Castro, and J. M. Madariaga ....................................................................................................... 5 Spectroscopic Characterization of Ferruginous Cements in a Temperate Beachrock Formation Close to Nerbioi-Ibaizabal Estuary (Tunelboka Cove, Bay of Biscay) N. Arrieta, A. Iturregi, I. Martinez-Arkarazo, X. Murelaga, J. I. Baceta, and J. M. Madariaga .................................................................................................... 6 Madrid L6 Chondrite (Fall 1896): ESEM-Cathodoluminescence Survey O. Azumendi, L. Tormo, J. Ruiz, and J. Garcia-Guinea .................................................................. 7 Raman Spectroscopy in Corals and Pearls L. Bergamonti, D. Bersani, and P. P. Lottici..................................................................................... 8 Raman Investigation on Pigeonite in Ureilite D. Bersani, L. Mantovani, M. Tribaudino, and P. P. Lottici .............................................................. 9 In Situ Planetary Mineralogy Using Simultaneous Time Resolved Fluorescence and Raman Spectroscopy J. Blacksberg and G. R. Rossman................................................................................................. 10 Quantitative Raman Spectroscopy (QRS), a Potential Tool to Study the Formation Mechanism of Carbonates of Early Earth and Mars L. J. Bonales, M. V. Muñoz-Iglesias, M. Sanchez-Román, D. Fernandez-Remolar, and O. Prieto-Ballesteros ........................................................................ 11 Shock-Induced Phase Transformations in Melt Pockets Within Martian Meteorite NWA 4468 S. Boonsue and J. Spray ............................................................................................................... 12 vi LPI Contribution No. 1616 Raman Microscopy of Samples of Martian Analogue Material with Cyanobacteria U. Böttger, J.-P. de Vera, J. Fritz, I. Weber, and H.-W. Hübers .................................................... 13 Micro Raman Spectroscopic Investigations of the Nature and Provenance of Carbonaceous Material in Micro-Fossil Bearing Rocks: Redefining D and G Carbon Band Parameters for the Detection of Biosignatures D. M. Bower, A. Steele, M. D. Fries, and L. Kater ......................................................................... 14 Trapped High Density Fluids and Melts in Superdeep Diamonds F. E. Brenker, S. Schmitz, L. Vincze, B. Vekemans, M. Krebs, W. de Nolf, K. Janssens, T. Stachel, and J. Harris........................................................................................... 15 Moganite in the Chalcedony Varieties of Continental Cherts (Miocene, Madrid Basin, Spain) M. A. Bustillo, J. L. Pérez-Jiménez, A. M. Alonso-Zarza, and M. Furio......................................... 16 Luminescence Behaviour and Raman Characterization of Rhodonite from Turkey N. Can, J. Garcia Guinea, M. Hatipoglu, R. Kibar, and A. Cetin ................................................... 17 Adenine Adsorbed on a Martian Meteorite as a Test Case for SERS Investigation of Extraterrestrial Life Traces S. Caporali, V. Moggi-Cecchi, M. Muniz-Miranda, M. Pagliai, G. Pratesi, and V. Schettino........................................................................................................... 18 Luminescence Spectra of Plagioclase (Labradorite) from South Greenland A. Cetin, R. Kibar, and N. Can ....................................................................................................... 19 Thermal Effect on the Cathodo- and Thermoluminescence Emission of Natural Topaz (Al2SiO4(F,OH)2) V. Correcher, J. Garcia-Guinea, C. Martin-Fernandez, and N. Can.............................................. 20 Preliminary Studies on the Spectra Luminescence of Brenkite Ca2F2CO3 E. Crespo-Feo, J. Garcia-Guinea, V. Correcher, and A. Nieto-Codina ......................................... 21 Effects of the Tectonic Stress on Luminescence of Cerussite PbCO3 E. Crespo-Feo, P. Hernandez-Ferreiros, J. Garcia-Guinea, and V. Correcher............................. 22 Vaterite Stability in the Presence of Cr (VI) J. A. Cruz, N. Sánchez-Pastor, A. M. Gigler, and L. Fernández-Díaz........................................... 23 Raman Micro-Spectroscopy Performed on Extraterrestrial Particles S. De Angelis, V. Della Corte, G. A. Baratta, R. Brunetto, P. Palumbo, A. Ciucci, and A. Rotundi ............................................................................................................... 24 Thermoluminescence Studies of Dergaon Meteorite P. Dutta and K. Duorah.................................................................................................................. 25 Raman Spectroscopic Characterisation of Green-Blue Stalactites in Lantz Cave (Navarra, North of Spain) S. Fdez-Ortiz de Vallejuelo, K. Castro, I. Martínez-Arkarazo, and J. M. Madariaga ..................... 26 Content of Rare Earth Elements in a Speleothem Analyzed by ICP-MS and CL-Spectroscopy A. Fernandez-Cortes, S. Cuezva, J. C. Cañaveras, J. Garcia-Guinea, and S. Sanchez-Moral.................................................................................................................... 27 CORALS II Conference vii Old and Modern Pigments Identification from a 14th Century Sculpture by Micro-Raman M. L. Franquelo, A. Duran, D. Arquillo, and J. L. Perez-Rodriguez............................................... 28 Francevillite [(Ba,Pb)(UO2)2(V2O8)5H2O] on the Hydroxyapatite Bond Fossils of Loranca (Cuenca, Spain): Spectrum Cathodoluminescence of Uranyl-Vanadates M. Furió, L. Merino, L. Tormo, A. Jorge, and J. Garcia-Guinea..................................................... 29 Mineral Variations Study
Recommended publications
  • New Mineral Names*,†
    American Mineralogist, Volume 104, pages 625–629, 2019 New Mineral Names*,† DMITRIY I. BELAKOVSKIY1 AND FERNANDO CÁMARA2 1Fersman Mineralogical Museum, Russian Academy of Sciences, Leninskiy Prospekt 18 korp. 2, Moscow 119071, Russia 2Dipartimento di Scienze della Terra “Ardito Desio”, Universitá di degli Studi di Milano, Via Mangiagalli, 34, 20133 Milano, Italy IN THIS ISSUE This New Mineral Names has entries for 8 new minerals, including fengchengite, ferriperbøeite-(Ce), genplesite, heyerdahlite, millsite, saranchinaite, siudaite, vymazalováite and new data on lavinskyite-1M. FENGCHENGITE* X-ray diffraction pattern [d Å (I%; hkl)] are: 7.186 (55; 110), 5.761 (44; 113), 4.187 (53; 123), 3.201 (47; 028), 2.978 (61; 135). 2.857 (100; 044), G. Shen, J. Xu, P. Yao, and G. Li (2017) Fengchengite: A new species with 2.146 (30; 336), 1.771 (36; 24.11). Single-crystal X-ray diffraction data the Na-poor but vacancy-dominante N(5) site in the eudialyte group. shows the mineral is trigonal, space group R3m, a = 14.2467 (6), c = Acta Mineralogica Sinica, 37 (1/2), 140–151. 30.033(2) Å, V = 5279.08 Å3, Z = 3. The structure was solved by direct methods and refined to R = 0.043 for all unique I > 2σ(I) reflections. Fengchengite (IMA 2007-018a), Na Ca (Fe3+,) Zr Si (Si O ) 12 3 6 3 3 25 73 Fenchengite is the Fe3+ analog of eudialyte with a structural difference (H O) (OH) , trigonal, is a new eudialyte-group mineral discovered in 2 3 2 in vacancy dominant N5 site and splitting its Na site N1 into N1a and the agpaitic nepheline syenites and its pegmatite facies near the Saima N1b sites.
    [Show full text]
  • ECONOMIC GEOLOGY RESEARCH INSTITUTE HUGH ALLSOPP LABORATORY University of the Witwatersrand Johannesburg
    ECONOMIC GEOLOGY RESEARCH INSTITUTE HUGH ALLSOPP LABORATORY University of the Witwatersrand Johannesburg CHROMITITES OF THE BUSHVELD COMPLEX- PROCESS OF FORMATION AND PGE ENRICHMENT J.A. KINNAIRD, F.J. KRUGER, P.A.M. NEX and R.G. CAWTHORN INFORMATION CIRCULAR No. 369 UNIVERSITY OF THE WITWATERSRAND JOHANNESBURG CHROMITITES OF THE BUSHVELD COMPLEX – PROCESSES OF FORMATION AND PGE ENRICHMENT by J. A. KINNAIRD, F. J. KRUGER, P.A. M. NEX AND R.G. CAWTHORN (Department of Geology, School of Geosciences, University of the Witwatersrand, Private Bag 3, P.O. WITS 2050, Johannesburg, South Africa) ECONOMIC GEOLOGY RESEARCH INSTITUTE INFORMATION CIRCULAR No. 369 December, 2002 CHROMITITES OF THE BUSHVELD COMPLEX – PROCESSES OF FORMATION AND PGE ENRICHMENT ABSTRACT The mafic layered suite of the 2.05 Ga old Bushveld Complex hosts a number of substantial PGE-bearing chromitite layers, including the UG2, within the Critical Zone, together with thin chromitite stringers of the platinum-bearing Merensky Reef. Until 1982, only the Merensky Reef was mined for platinum although it has long been known that chromitites also host platinum group minerals. Three groups of chromitites occur: a Lower Group of up to seven major layers hosted in feldspathic pyroxenite; a Middle Group with four layers hosted by feldspathic pyroxenite or norite; and an Upper Group usually of two chromitite packages, hosted in pyroxenite, norite or anorthosite. There is a systematic chemical variation from bottom to top chromitite layers, in terms of Cr : Fe ratios and the abundance and proportion of PGE’s. Although all the chromitites are enriched in PGE’s relative to the host rocks, the Upper Group 2 layer (UG2) shows the highest concentration.
    [Show full text]
  • Brushite and Taranakite from Pig Hole Cave, Giles County, Virginia
    BRUSHITE AND TARANAKITE FROM PIG HOLE CAVE, GILES COUNTY, VIRGINIA Jonw W. MunnAv, Department oJ Chemistry, and Rrcnano V. Drrrnrcu, Departmenl.of Geo- logical S ciences,V ir ginia P olytechnicI nstitute, Blacksburg, Virginia. Ansrnacr Brushite occurs as nodular massesof platy crystals in the lower part of a bat guano and hair deposit in Pig Hole Cave, Giles County, Virginia. Taranakite occurs as flour-like masses near contacts between the guano and hair deposit and clay and along fractures within brecciated clay within the same cave. Chemical, physical, optical, r-ray, and thermal data for each of these minerals are presented. Some of the thermal data for brushite ano many of the data for taranakite are reported here for the first time. It is suggested that the taranakite formed as the result of reactions between the bat guano and bat hair and clay. Iwrnorucuow The presenceof the minerals later identified as brushite and taranakite in a bat guano and hair deposit in Pig Hole Cave, Giles County, Virginia, was discoveredin January, 1954. So far as has been ascertainedby a search of the literature, this is the first reported natural occurrence of either brushite or taranakite in the United States of America. After posi- tive identification of the minerals, further investigations of them were undertaken mainly becauseof their relative abundance within the cave. Locar,try AND OccURRENCES Pig Hole Cave is located beneath the property of A. B. Porterfield on Johns Creek Mountain in southeastern Giles County, southwestern Virginia. The cave was so named becauseof the former presencewithin it of the odoriferous remains of a pig lodged in a crawlway beneath the natural opening to the cave.
    [Show full text]
  • Mineral Processing
    Mineral Processing Foundations of theory and practice of minerallurgy 1st English edition JAN DRZYMALA, C. Eng., Ph.D., D.Sc. Member of the Polish Mineral Processing Society Wroclaw University of Technology 2007 Translation: J. Drzymala, A. Swatek Reviewer: A. Luszczkiewicz Published as supplied by the author ©Copyright by Jan Drzymala, Wroclaw 2007 Computer typesetting: Danuta Szyszka Cover design: Danuta Szyszka Cover photo: Sebastian Bożek Oficyna Wydawnicza Politechniki Wrocławskiej Wybrzeze Wyspianskiego 27 50-370 Wroclaw Any part of this publication can be used in any form by any means provided that the usage is acknowledged by the citation: Drzymala, J., Mineral Processing, Foundations of theory and practice of minerallurgy, Oficyna Wydawnicza PWr., 2007, www.ig.pwr.wroc.pl/minproc ISBN 978-83-7493-362-9 Contents Introduction ....................................................................................................................9 Part I Introduction to mineral processing .....................................................................13 1. From the Big Bang to mineral processing................................................................14 1.1. The formation of matter ...................................................................................14 1.2. Elementary particles.........................................................................................16 1.3. Molecules .........................................................................................................18 1.4. Solids................................................................................................................19
    [Show full text]
  • Mineralogical Reconnaissance of Caves from Mallorca Island
    ENDINS, núm. 27. 2005. Mallorca MINERALOGICAL RECONNAISSANCE OF CAVES FROM MALLORCA ISLAND by Bogdan P. ONAC 1, Joan J. FORNÓS 2, Àngel GINÉS 3 and Joaquín GINÉS 2 Resum S’han fet prospeccions des d’un punt de vista mineralògic a divuit cavitats de l’illa de Mallorca. Han estat identificats, mitjançant anàlisis de difracció de raigs-X, infraroigs, tèrmics i microscopia electrònica (SEM), 16 minerals que s’engloben dins de quatre grups químics diferents. La calcita ha estat l’únic mineral present a totes les cavitats prospeccionades. En espeleotemes de quatre coves diferents s’ha iden- tificat aragonita, guix i hidroxilapatita. Endemés, també han estat identificats alguns altres minerals dels grups dels carbonats, fosfats i silicats, presents en forma de crostes, cristalls diminuts o masses terroses. Els mecanismes responsables de la deposició mineral en les coves de Mallorca són: (i) precipitació a partir de l’aigua de percolació, (ii) precipitació en la zona de mescla (aigua dolça – aigua marina), (iii) reacció entre la roca encaixant i diversos espeleotemes, i les solucions enriquides en fosfats procedents del guano de les rates pinyades, i (iv) transició de fases mi- nerals. Des del punt de vista de la mineralogia, la Cova de sa Guitarreta i la Cova de ses Rates Pinyades s’han confirmat com a dues de les coves més destacables; cada una d’elles presenta vuit autèntics minerals de cova. L’associació de fosfats que contenen és diversa i interessant. Abstract Eighteen caves on the Mallorca Island were investigated with respect to their mineralogy. Sixteen minerals, divided into four chemical groups, were identified and described using X-ray diffraction, infrared, thermal, and scanning electron microsco- pe analyses.
    [Show full text]
  • The Effect of Sub-Surface Strontium Depletion on Oxygen Diffusion In
    Journal of Materials Chemistry A View Article Online PAPER View Journal | View Issue The effect of sub-surface strontium depletion on oxygen diffusion in La Sr Co Fe O Àd† Cite this: J. Mater. Chem. A, 2020, 8, 0.6 0.4 0.2 0.8 3 19414 Mathew A. R. Niania, *a Andrew K. Rossall, b Jaap A. Van den Berg b and John A. Kilner a The immediate surface and sub-surface composition of heat treated La0.6Sr0.4Co0.2Fe0.8O3Àd samples was measured by ion beam analysis and compared to oxygen transport properties over the same depth scale. Consistent with the literature, strontium segregation was observed for samples that received thermal treatments with the formation of an Sr–O based monolayer at the surface. Just below this, a sub-surface strontium depletion region over a depth scale of approximately 2–15 nm was seen. In this sub-surface region, a depletion of lanthanum was also observed. Oxygen transport properties were measured using isotopic labelling techniques and showed that, despite large changes in composition, the transport Received 18th June 2020 properties remain largely unchanged. Because strontium diffusion is slow in the bulk and grain Accepted 2nd September 2020 boundaries only account for 0.03% of the material (due to large grains), it is suggested that 2D defects Creative Commons Attribution-NonCommercial 3.0 Unported Licence. DOI: 10.1039/d0ta06058e (such as dislocations and twins) can act as fast diffusion pathways for the strontium to account for the Sr rsc.li/materials-a depletion region observed below the surface.
    [Show full text]
  • JOHN HENNI Nevjvian the O Rigins and a P P Licatio N of H Is E Ducational Ideas Ph.D. T Hesis 1968 JOHN JACKSON
    JOHN HENNI NEVJvIAN The Origins and Application of his Educational Id eas Ph.D. Thesis 1968 JOHN JACKSON ProQuest Number: U622466 All rights reserved INFORMATION TO ALL USERS The quality of this reproduction is dependent upon the quality of the copy submitted. In the unlikely event that the author did not send a complete manuscript and there are missing pages, these will be noted. Also, if material had to be removed, a note will indicate the deletion. uest. ProQuest U622466 Published by ProQuest LLC(2015). Copyright of the Dissertation is held by the Author. All rights reserved. This work is protected against unauthorized copying under Title 17, United States Code. Microform Edition © ProQuest LLC. ProQuest LLC 789 East Eisenhower Parkway P.O. Box 1346 Ann Arbor, Ml 48106-1346 CONTENTS C hapter Page One Introduction • • • 1 Two The impact of his family 16 Three The impact of Ealing School .. 31 Four The impact of Oxford University 52 Five His early ventures 71 Six His work in Ireland 84 Seven How he established the Oratory School 120 Eight How he saved the Oratory School 149 Nine His work as headmaster of the Oratory School 193 Ten His abortive plans to return to Oxford 234 Eleven His reaction to Manning’s Kensington scheme 241 Twelve Conclusion 245 Appendices 258 Bibliography 280 CHAPTER ONE INTHODUCTION 1. CHAPTER ONE INTRODUCTION When he wrote his memoirs, Newman declared that **from first to last education in the large sense of the word has been my line," (1 ) ( 2) By this he meant that his educational ideas 'were an integral part of his philosophical and spiritual thinking, that they were basic to the most fundamental and personal of his beliefs, and had been acquired gradually over the years.
    [Show full text]
  • The Mineralogical Magazine Journal
    THE MINERALOGICAL MAGAZINE AND JOURNAL OF THE MINERALOGICAL SOCIETY. 1~o. 40. OCTOBER 1889. Vol. VIII. On the Meteorites which have been found iu the Desert of Atacama and its neighbourhood. By L. FLETCHER, M.A., F.R.S., Keeper of Minerals in the British Museum. (With a Map of the District, Plate X.) [Read March 12th and May 7th, ]889.J 1. THE immediate object of the present paper is to place on record J- the history and characters of several Atacama meteorites of which no description has yet been published; but incidentally it is con- venient at the same time to consider the relationship of these masses to others from the same region, which either have been already described, or at least are stated to be preserved in one or more of the known Meteo. rite-Collections. 2. The term " Desert of Atacama " is generally applied to that part of western South America which lies between the towns of Copiapo and Cobija, about 330 miles distant from each other, and which extends island as far as the Indian hamlet of Antofagasta, about 180 miles from 224 L. FLETCHER ON THE METEORITES OF ATACAMA. the coast. The Atacama meteorites preserved in the Collections have been found at several places widely separated throughout the Desert. 3. A critical examination of the descriptive literature, and a compari- son of the manuscript and printed meteorite-lists, which have been placed at my service, lead to the conclusion that all the meteoritic frag- ments from Atacama now preserved in the known Collections belong to one or other of at most thirteen meteorites, which, for reasons given below, are referred to in this paper under the following names :-- 1.
    [Show full text]
  • Thirty-Fourth List of New Mineral Names
    MINERALOGICAL MAGAZINE, DECEMBER 1986, VOL. 50, PP. 741-61 Thirty-fourth list of new mineral names E. E. FEJER Department of Mineralogy, British Museum (Natural History), Cromwell Road, London SW7 5BD THE present list contains 181 entries. Of these 148 are Alacranite. V. I. Popova, V. A. Popov, A. Clark, valid species, most of which have been approved by the V. O. Polyakov, and S. E. Borisovskii, 1986. Zap. IMA Commission on New Minerals and Mineral Names, 115, 360. First found at Alacran, Pampa Larga, 17 are misspellings or erroneous transliterations, 9 are Chile by A. H. Clark in 1970 (rejected by IMA names published without IMA approval, 4 are variety because of insufficient data), then in 1980 at the names, 2 are spelling corrections, and one is a name applied to gem material. As in previous lists, contractions caldera of Uzon volcano, Kamchatka, USSR, as are used for the names of frequently cited journals and yellowish orange equant crystals up to 0.5 ram, other publications are abbreviated in italic. sometimes flattened on {100} with {100}, {111}, {ill}, and {110} faces, adamantine to greasy Abhurite. J. J. Matzko, H. T. Evans Jr., M. E. Mrose, lustre, poor {100} cleavage, brittle, H 1 Mono- and P. Aruscavage, 1985. C.M. 23, 233. At a clinic, P2/c, a 9.89(2), b 9.73(2), c 9.13(1) A, depth c.35 m, in an arm of the Red Sea, known as fl 101.84(5) ~ Z = 2; Dobs. 3.43(5), D~alr 3.43; Sharm Abhur, c.30 km north of Jiddah, Saudi reflectances and microhardness given.
    [Show full text]
  • Platinum Group Minerals in Eastern Brazil GEOLOGY and OCCURRENCES in CHROMITITE and PLACERS
    DOI: 10.1595/147106705X24391 Platinum Group Minerals in Eastern Brazil GEOLOGY AND OCCURRENCES IN CHROMITITE AND PLACERS By Nelson Angeli Department of Petrology and Metallogeny, University of São Paulo State (UNESP), 24-A Avenue, 1515, Rio Claro (SP), 13506-710, Brazil; E-mail: [email protected] Brazil does not have working platinum mines, nor even large reserves of the platinum metals, but there is platinum in Brazil. In this paper, four massifs (mafic/ultramafic complexes) in eastern Brazil, in the states of Minas Gerais and Ceará, where platinum is found will be described. Three of these massifs contain concentrations of platinum group minerals or platinum group elements, and gold, associated with the chromitite rock found there. In the fourth massif, in Minas Gerais State, the platinum group elements are found in alluvial deposits at the Bom Sucesso occurrence. This placer is currently being studied. The platinum group metals occur in specific Rh and Os occur together in minerals in various areas of the world: mainly South Africa, Russia, combinations. This particular PGM distribution Canada and the U.S.A. Geological occurrences of can also form noble metal alloys (7), and minerali- platinum group elements (PGEs) (and sometimes sation has been linked to crystallisation during gold (Au)) are usually associated with Ni-Co-Cu chromite precipitation of hydrothermal origin. sulfide deposits formed in layered igneous intru- In central Brazil there are massifs (Americano sions. The platinum group minerals (PGMs) are do Brasil and Barro Alto) that as yet are little stud- associated with the more mafic parts of the layered ied, and which are thought to contain small PGM magma deposit, and PGEs are found in chromite concentrations.
    [Show full text]
  • Mineralogical Data on Bat Guano Deposits from Three Romanian Caves
    Studia UBB Geologia, 2013, 58 (2), 13 – 18 Mineralogical data on bat guano deposits from three Romanian caves Alexandra GIURGIU1* & Tudor TĂMAŞ1,2 1Department of Geology, Babeș-Bolyai University, Kogălniceanu 1, 400084 Cluj-Napoca, Romania 2“Emil Racoviţă” Institute of Speleology, Clinicilor 5, 400006 Cluj-Napoca, Romania Received August 2013; accepted September 2013 Available online 14 October 2013 DOI: http://dx.doi.org/10.5038/1937-8602.58.2.2 Abstract. Mineralogical studies performed on crusts, nodules and earthy masses from the Romanian caves Gaura cu Muscă, Gaura Haiducească and Peștera Zidită have revealed the presence of three different phosphate associations. The minerals have been identified by means of X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy. Five phosphates have been identified in the samples, with hydroxylapatite the only common mineral in all the three caves. Brushite, taranakite, leucophosphite and variscite are the other phosphates identified. Associated minerals include gypsum, calcite, quartz, and illite-group minerals. Aside from differences in the lithology, the occurrences of the different phosphate minerals indicate variable pH and relative humidity conditions near or within the guano accumulations. Keywords: guano, cave phosphate associations, Gaura cu Muscă, Gaura Haiducească, Zidită Cave, Romania INTRODUCTION environmental conditions in which they have formed. Of these three caves, only Gaura cu Muscă was previously studied with respect to Phosphate minerals are a common feature in caves containing its mineralogy, and a phosphate association consisting of vashegyite, bat guano accumulations, where they form as a result of the crandallite, and ardealite was described (Onac et al., 2006). interaction of guano derived solutions with the cave bedrock or with secondary (chemical or detrital) cave deposits.
    [Show full text]
  • DISTRIBUTION of PULTUSK METEORITE FRAGMENTS. T. Brachaniec1 and J. W. Kosiński2, 1University of Silesia; Faculty of Earth Science; Bedzinska Str
    45th Lunar and Planetary Science Conference (2014) 1067.pdf DISTRIBUTION OF PULTUSK METEORITE FRAGMENTS. T. Brachaniec1 and J. W. Kosiński2, 1University of Silesia; Faculty of Earth Science; Bedzinska str. 60, 41-200 Sosnowiec; email: [email protected], 2Comet and Meteor Workshop - Meteorites Section, Warsaw; email: [email protected]. Pultusk meteorite, which is classified as a brec- Modern research of literature and field working ciated H5 chondrite [1] fell at 30th of January 1868 in (Fig. 1) clearly show that the map created by Sam- Central Poland. The bolide was witnessed over a huge sonowicz is only a approximate picture of the distribu- part of Europe, from cities in Hungary and Austria in tion of Pultusk meteorites. The result of a field search- the south, to Gdańsk (Poland), Russia, in the north, ing is an observation that in a small area occur small and big specimens. Author has been claimed that in and from Berlin (Germany), in the west to Grodno the central part of the ellipse should be found speci- (Belarus), in the east. The shock from the bolide re- mens from 0.2 to 2 kg, however, in this area occur portedly collapsed structures in Warsaw, 60 km south small meteorites, weighing a few grams, called “Pul- of where it impacted. Within a few days of the fall, tusk peas”. There are many indications that Sam- about 400 pieces of the meteorite were collected. sonowicz also overestimated the amount of fallen me- After 80 years after the fall Samsonowicz as first teorites [3][4]. published his field working results [2].
    [Show full text]