DOCSLIB.ORG

Planetoidy I Meteoryty – Brachinity – Cabin Creek, Landes – Zag³ada Sprzed 65 Mln Lat Zapisana W Ska³ach – Wiedeñska Kolekcja Meteorytów – Morávka — 11 Lat Póÿniej

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Planetoidy I Meteoryty – Brachinity – Cabin Creek, Landes – Zag³ada Sprzed 65 Mln Lat Zapisana W Ska³ach – Wiedeñska Kolekcja Meteorytów – Morávka — 11 Lat Póÿniej KWARTALNIK MI£OŒNIKÓW METEORYTÓW METEORYTMETEORYT Nr 3 (79) Wrzesieñ 2011 ISSN 1642-588X – Boso w Greenwich – Planetoidy i meteoryty – Brachinity – Cabin Creek, Landes – Zag³ada sprzed 65 mln lat zapisana w ska³ach – Wiedeñska kolekcja meteorytów – Morávka — 11 lat póŸniej 3/2011 METEORYT 1 Od redaktora: METEORYT Badanie pozaziemskich ska³ pozwala oderwaæ siê na chwilê od przyziemnych kwartalnik dla mi³oœników problemów, ale one i tak cz³owieka dopadn¹. Meteorytyków sprowadzaj¹ na ziemiê meteorytów g³ównie dwa problemy, oba na „p”: pieni¹dze, a raczej ich brak, i polityka, nastawiona na konfrontacjê zamiast wspó³pracy. Gdy na konferencji Meteoritical Wydawca: Society nie pojawi³a siê Wiera Semenenko, pomyœla³em o pierwszym z nich. Dla mnie Olsztyñskie Planetarium by³ to nie lada problem, a na Ukrainie jest z tym znacznie gorzej. Po konferencji i Obserwatorium Astronomiczne dowiedzia³em siê jednak, ¿e powód by³ polityczny: brytyjska ambasada nie da³a wizy. Al. Pi³sudskiego 38 Urzêdników nie interesowa³o, ¿e pani profesor pracowa³a ju¿ i w USA i we Francji. Dostali polecenie, by nie wpuszczaæ Ukraiñców do Wielkiej Brytanii i kropka. 10-450 Olsztyn Przykre by³o te¿ to, ¿e organizatorzy s³owem nie wspomnieli, ¿e z powodów tel. (0-89) 533 4951 politycznych niektórzy naukowcy nie mogli wzi¹æ udzia³u w konferencji. [email protected] Polityka brytyjskich konserwatystów, którzy rok wczeœniej doszli do w³adzy, zaszkodzi³a konferencji tak¿e w inny sposób: doprowadzi³a poœrednio do powa¿nych konto: zamieszek w Londynie i innych miastach. Na szczêœcie dla konferencji jedynym 88 1540 1072 2001 5000 3724 0002 skutkiem by³o tylko odwo³anie sesji plakatowej, akurat tej, na której mia³ byæ BOŒ SA O/Olsztyn pokazany plakat o So³tmanach. Odnoszê wra¿enie, ¿e ten meteoryt przynosi pecha. Pieni¹dze s¹ problemem dla wszystkich i dlatego konferencje organizowane s¹ Kwartalnik jest dostêpny g³ównie na ró¿nych kontynentach, by umo¿liwiæ udzia³ przynajmniej w niektórych. Tym w prenumeracie. Roczna prenu- razem z Polski by³y a¿ cztery osoby, z tego trzy m³ode, rozpoczynaj¹ce karierê merata wynosi w 2011 roku 44 z³. naukow¹, co dobrze wró¿y na przysz³oœæ. Niestety cztery kolejne konferencje bêd¹ Zainteresowanych prosimy o wp³a- poza Europ¹ i znalezienie pieniêdzy na delegacjê do Cairns, w Australii, cenie tej kwoty na konto wydawcy w przysz³ym roku, bêdzie znacznie trudniejszym zadaniem. Wiêksza szansa bêdzie nie zapominaj¹c o podaniu czytel- zapewne na wyjazd do Maroka za trzy lata. nego imienia, nazwiska i adresu do Ten numer „Meteorytu” jest siedemdziesi¹ty dziewi¹ty z kolei, co dla wysy³ki. Wydawca dysponuje tak¿e kwartalnika oznacza, ¿e nastêpny numer zamknie 20 lat wydawania. Z satysfakcj¹ numerami archiwalnymi. zauwa¿am, ¿e w tegorocznych numerach pojawi³o siê wiele artyku³ów polskich autorów i ta tendencja siê utrzymuje. Jest to powa¿na zachêta dla redakcji, by Wiêkszoœæ publikowanych arty- kontynuowaæ wydawanie kwartalnika. ku³ów jest t³umaczona z kwartalnika Podczas nagrywania odcinka serialu „Meteorite Men” w rezerwacie Morasko METEORITE za zgod¹ jego wy- Steve Arnold zlokalizowa³ meteoryt wa¿¹cy 34 kg, wbity w i³y poznañskie na dawcy, który zachowuje prawa do g³êbokoœæ blisko 2 m. Jego znalezienie po³o¿y³o kres domniemaniom, ¿e meteoryty tych artyku³ów. Morasko mog³y byæ z³o¿one przez lodowiec na morenie czo³owej. Meteoryt jest doœæ mocno zwietrza³y i prof. Karwowski z zainteresowaniem bada jego piêkn¹ Redaguje i t³umaczy wiêkszoœæ kolekcjê wtórnych minera³ów utworzonych w wyniku wietrzenia. Szczegó³y tekstów: w nastêpnym numerze. Andrzej S. Pilski Andrzej S. Pilski skr. poczt. 6 14-530 Frombork tel. kom. 696 805 247 [email protected] Sk³ad: Jacek Dr¹¿kowski Druk: studiomartin.pl METEORITE THE INTERNATIONAL QUARTERLY OF METEORITES AND METEORITE SCIENCE Arkansas Center for Space and Planetary Sciences FELD 202 University of Arkansas Fayetteville, AR 72701, USA Email:[email protected] http://meteoritemag.uark.edu Meteorite is available only by sub- Przekrój meteorytu Morasko wykopanego przez „Meteorite Men”. Z lewej liczne paski cohenitu scription, for US$35 per year. Over- widoczne tak¿e w zwietrzelinie. Fot. A. S. Pilski. Ok³adka: U góry Katarzyna £uszczek podczas sesji plakatowej w Greenwich. Na dole budynki seas airmail delivery is available for Uniwersytetu widziane z Tamizy. Sesje plakatowe odbywa³y siê pod kolumnami; po prawej ta prze- an additional US$12 per year. niesiona z wtorku, a po lewej czwartkowa. Prezentacje by³y w budynku za wie¿yczk¹ z kopu³¹ po prawej. W oddali na wzgórzu widaæ Obserwatorium z po³udnikiem zerowym. Fot. A. S. Pilski 2 METEORYT 3/2011 Boso w Greenwich Andrzej S. Pilski oso oznacza pokorê. W przy- idealizacj¹ doœæ odleg³¹ od rzeczywi- kopalisk prowadzonych na Danebury padku siedemdziesi¹tej czwar- stoœci. Okruch ten musia³ powstaæ jako Hill, starym forcie z epoki ¿elaza. Skla- Btej konferencji Meteoritical czêœæ ska³y magmowej na planetoidzie, syfikowano go oficjalnie w roku 1991, Society, która odbywa³a siê na Uniwer- która uformowa³a siê i zosta³a rozbita po czym gdzieœ siê zapodzia³. Dopiero sytecie w Greenwich, a której gospo- przed uformowaniem siê cia³a macie- w ostatnich latach odnaleziono go i oba darzami byli Natural History Museum rzystego tego chondrytu EH3. meteoryty poddano dok³adnym bada- oraz Imperial College w Londynie, po- Gdy po kilku prezentacjach nadesz³a niom. Poniewa¿ oba s¹ typu H5, podej- kora ta by³a jak najbardziej uzasadnio- pora na seriê prac na temat bencubbi- rzewano, ¿e mog¹ pochodziæ z jedne- na. Nie tylko wobec osób o s³awnych nitów z Gujb¹ na czele, prezentowa- go spadku. Okaza³o siê jednak, ¿e wiek nazwiskach, które po raz pierwszy mo- nych w sesji o chondrytach wêglistych, ziemski i stopieñ zwietrzenia to wyklu- g³em zobaczyæ bezpoœrednio, a nie tyl- sporo osób wywêdrowa³o z sali. Ponie- czaj¹. Du¿y meteoryt le¿y na Ziemi od ko na monitorze komputera, ale przede wa¿ siedzia³em na œrodku, wola³em nie oko³o 10 tys. lat, a ma³y spad³ oko³o wszystkim wobec ogromu poruszanych robiæ dodatkowego zamieszania i zo- 2300 lat temu do czêœciowo zasypane- tematów. Oczywiœcie nie wszystkie sta³em, za co zosta³em nagrodzony cie- go do³u w wapiennej skale, w którym z ponad piêciuset prezentacji by³y wy- kaw¹ prezentacj¹ o posolonych chon- wczeœniej mieszkañcy fortu przecho- bitne, ale tych donios³ych by³o wystar- drytach, któr¹ przedstawi³ Mark Fries wywali zbo¿e. czaj¹co du¿o, by popaœæ w lekkie przy- z kolegami. Autorzy analizowali krysz- Prof. Pillinger zwróci³ uwagê, ¿e gnêbienie, ¿e nie jest siê w stanie tego ta³ki halitu w chondrytach Monahans w okolicy Lake House, niedaleko Sa- wszystkiego ogarn¹æ. i Zag i znaleŸli w nich inkluzje minera- lisbury i Stonehenge, przebiega po³u- Aby konferencja nie trwa³a tygo- ³ów o innym sk³adzie, ni¿ typowy dla dniowa granica zlodowacenia. Jest wiêc dniami, prezentacje odbywa³y siê na chondrytów H. Doszli do wniosku, ¿e mo¿liwe, ¿e le¿y tam wiêcej meteory- trzech równoleg³ych sesjach i trudno kryszta³y halitu mog³y zostaæ wyrzuco- tów przyniesionych i pozostawionych by³o oczekiwaæ, ¿e organizatorzy ne przez gejzery na planetoidzie prze- przez lodowiec, a kamieñ z Lake Ho- wezm¹ pod uwagê moje zainteresowa- latuj¹cej niedaleko macierzystej plane- use mo¿e byæ jednym z nich. nia i u³o¿¹ program tak, bym móg³ wy- toidy chondrytów H, która w rezultacie Po po³udniu znów by³y zaplanowa- s³uchaæ najciekawszych referatów. Nie zosta³a posolona. Temat gejzerów i wul- ne trzy sesje, ale tym razem wybór by³ tylko ja mia³em z tym problem, o czym kanów na m³odych planetoidach zaczy- oczywisty. Sala, któr¹ wybra³em, pêka- œwiadczy³y nieustanne wêdrówki lu- na pojawiaæ siê coraz czêœciej. Wiele ³a w szwach, a dwie pozosta³e zapew- dów miêdzy salami wyk³adowymi. planetoid musia³o byæ stopionych, wiêc ne œwieci³y pustkami. Tematem sesji We wtorek na przyk³ad mia³em trud- takie zjawiska musia³y zachodziæ i war- by³a Westa, a pierwsz¹ prezentacjê ny wybór miêdzy sesj¹ na temat chon- to rozwa¿aæ ich œlady w meteorytach. przedstawi³ Harry Y. McSween z zespo- drytów wêglistych, a sesj¹ o chondry- Po zakoñczeniu tej sesji stan¹³em ³u badawczego Dawn Mission. Kiedyœ tach zwyczajnych i enstatytowych. przed kolejnym trudnym wyborem. t³umaczy³em na polski jego ksi¹¿kê Wybra³em tê drug¹ i okaza³o siê, ¿e Program przewidywa³ przerwê na „Od gwiezdnego py³u do planet” i mia- podobnego wyboru dokonali Alan Ru- lunch, ale niespodziewanie brytyjscy ³em nadziejê spotkaæ siê z nim, ale po bin, Derek Sears i John Wasson. Nie badacze meteorytów zaprosili nas na zakoñczeniu sesji gdzieœ znikn¹³ i wiê- mia³em najmniejszych trudnoœci z ich specjalny wyk³ad prof. Pillingera cej go nie widzia³em. Sama prezenta- rozpoznaniem, bo trudno by³o ich nie z Open University o meteorytach znaj- cja nie zawiera³a niespodzianek, bo son- zauwa¿yæ. Uczestniczyli praktycznie dowanych na po³udniu Anglii. Oba me- da dopiero co wesz³a na orbitê wokó³ w ka¿dej dyskusji i widaæ by³o, ¿e do- teoryty mia³y byæ prezentowane na se- Westy i na prezentacjê wyników by³o skonale orientuj¹ siê w chondrytowej sjach plakatowych, ale widaæ profesor za wczeœnie. By³a bardziej form¹ tematyce. Podobnie aktywny by³ Ah- mia³ du¿o wiêcej do powiedzenia. Po- uczczenia sukcesu. med El Goresy, mo¿e nie tak znany niewa¿ dotyczy³o to znanej mi okolicy, Po prezentacji zostaliœmy niestety w œwiecie, jak trzej poprzedni, ale wybra³em wyk³ad. boleœnie sprowadzeni na ziemiê. w Niemczech nie trzeba go nikomu Na pó³noc od Winchesteru, z które- Wszed³ jeden z organizatorów i poin- przedstawiaæ. go doje¿d¿a³em na konferencjê, znale- formowa³, ¿e ze wzglêdu na niepokoje W³aœnie Ahmed El Goresy rozpocz¹³ ziono w odleg³oœci ok.
Load more

Recommended publications
  • (Sptpang Coil.) [I49] I50 Bulletin American Museum of Natural History
    Article VIII.-CATALOGUE OF METEORITES IN THE COLLECTION OF THE AMERICAN MUSEUM OF NATURAL HISTORY, TO JULY i, I896. By E. 0. HOVEY. 'T'he Collection of Meteorites in the Arnerican Museum of Natural History consists of fifty-five slabs, fragments and com- plete individuals, representing twenty-six falls and finds. The foundation of the mineralogical department of the Museum was laid in I874 by the purchase of the collection of S. C. H. Bailey, in which there were a few meteorites. More were acquired with the portion of the Norman Spang Collection of Minerals which was purchased in I89I, and other meteorites have been bought by the Museum from time to time, or have been presented to it by friends. The soujrce from which each specimen came has been indicated in the following cataloguLe. This publication is made to assist. the large number of persons who have become interested in knowing the extent to which the material of various falls and finds has been distributed among collections and the present location of specimens. AEROSIDERITES. (IRON METEORI ES.) Cat. Date of NAME AND Weight No. Discovery. DE;SCRIPTION. in grams. 18 1784 Tejupilco, Toluca Valley, Mexico. A complete individual, the surface of which has scaled off somewhat. A polished and etched surface shows coarse Widmanstatten figures. 1153. (Bailey Co/i.) 17841 Xiquipilco, Toluca Valley, Mexico. A complete individual of ellipsoidal form, which had been used as a pounder by the natives. 564. (Sptpang Coil.) [I49] I50 Bulletin American Museum of Natural History. [Vol. VIII, AEROSIDERITES.-Continued. Cat. Date of NAME AND DESCRIPTION.
    [Show full text]
  • Iron Meteorites Are Made of Fe-Ni Metal Phases with Such Minor Minerals As Schrebersite, Troilite, Cohenite and Other Fe-Ni Carbides
    Bulk elemental analyses of iron meteorites by using INAA and LA-ICPMS. N. Shirai1, A. Yamaguchi2, M. K. Haba2, T. Ojima2, M. Ebiahra1 and H. Kojima2, 1Tokyo Metropolitan Univer- sity, 2National Institute of Polar Research. Introduction: Iron meteorites are made of Fe-Ni metal phases with such minor minerals as schrebersite, troilite, cohenite and other Fe-Ni carbides. As most iron meteorites are believed to be samples from the metallic core of differentiated planetesimals, petrological, mineralogical and chemi- cal studies of iron meteorites are fundamental for unraveling the process of planetary differentiation. Based on the structures, iron meteorites are originally classified into hexahedrites, octahedrites and ataxites. Hexahedrites and ataxites are nearly made of kamacite and taenite, respectively. Octahedrites consist of kamacite and taenite, and they are further divided into six subgroups on the basis of the width of the kamcite from finest (>0.2 mm) to coarsest (>3.3 mm). Almost all iron meteorites are classified into octahedrites. The chemical clas- sification of iron meteorites is based on their trace element compositions (Ni, Ga, Ge and Ir). Bulk elemental abundances for iron meteorites have been obtained by using neutron activation analysis (NAA). Other analytical methods such as laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) have not been very often applied to iron meteorites. In this study, we present simple and effective procedures for the chemical classification of iron meteorites by using INAA and LA-ICPMS. Based on the analytical data obtained by two analytical techniques, we discuss the accuracy and the precision of our data and how promisingly our analytical methods can be applied to classifica- tion of iron meteorites.r 9, 2016 (12:00 pm, JST) Experimental: Canyon Diablo (IAB), Toluca (IAB), Cape York (IIIAB), Muonionalusta (IVA) and Dronino (ungrouped) were analyzed by using two analytical methods (INAA and LA-ICPMS).
    [Show full text]
  • Linking the Chassigny Meteorite and the Martian Surface Rock Backstay: Insights Into Igneous Crustal Differentiation Processes on Mars
    Meteoritics & Planetary Science 44, Nr 6, 853–869 (2009) Abstract available online at http://meteoritics.org Linking the Chassigny meteorite and the Martian surface rock Backstay: Insights into igneous crustal differentiation processes on Mars Hanna NEKVASIL*, Francis M. MCCUBBIN, Andrea HARRINGTON, Stephen ELARDO, and Donald H. LINDSLEY Department of Geosciences, Stony Brook University, Stony Brook, New York 11794–2100, USA *Corresponding author. E-mail: [email protected] (Received 05 August 2008; revision accepted 18 March 2009) Abstract–In order to use igneous surface lithologies to constrain Martian mantle characteristics, secondary processes that lead to compositional modification of primary mantle melts must be considered. Crystal fractionation of a mantle-derived magma at the base of the crust followed by separation and ascent of residual liquids to the surface is common in continental hotspot regions on Earth. The possibility that this process also takes place on Mars was investigated by experimentally determining whether a surface rock, specifically the hawaiite Backstay analyzed by the MER Spirit could produce a known cumulate lithology with a deep origin (namely the assemblages of the Chassigny meteorite) if trapped at the base of the Martian crust. Both the major cumulus and melt inclusion mineral assemblages of the Chassigny meteorite were produced experimentally by a liquid of Backstay composition within the pressure range 9.3 to 6.8 kbar with bulk water contents between 1.5 and 2.6 wt%. Experiments at 4.3 and 2.8 kbar did not produce the requisite assemblages. This agreement suggests that just as on Earth, Martian mantle-derived melts may rise to the surface or remain trapped at the base of the crust, fractionate, and lose their residual liquids.
    [Show full text]
  • Sitzungsberichte Und Abhandlungen Der Naturwissenschaftlichen Gesellschaft Isis in Dresden
    ZOBODAT - www.zobodat.at Zoologisch-Botanische Datenbank/Zoological-Botanical Database Digitale Literatur/Digital Literature Zeitschrift/Journal: Sitzungsberichte und Abhandlungen der Naturwissenschaftlichen Gesellschaft Isis in Dresden Jahr/Year: 1911 Band/Volume: 1911 Autor(en)/Author(s): Schreiter Rudolf Artikel/Article: VI. Die Meteoriten des Kgl. Mineralogischen Museums in Dresden 1058-1075 © Biodiversity Heritage Library, http://www.biodiversitylibrary.org/;www.zobodat.at VI. Die Meteoriten des Kgl. Mineralogischen Museums in Dresden. Yon Dr. R. Schreiter. Die Meteoritensammlung des Kgl. Mineralogischen Museums in Dresden hat besonders im Laufe der letzten Jahre wertvollen Zuwachs erfahren, so dafs es geboten erscheint, über ihren derzeitigen Stand einen Bericht zu veröffentlichen, in dem zugleich eine gedrängte Übersicht über ihre Entwicklung gegeben werden soll. Nach Ausweis des von H. Gössel aufgestellten alten Katalogs vom Jahre 1846 waren, abgesehen von zweifel- haften Meteoriten, wie Collina di Brianza, San Sacramento Lake u. a. bis dahin Stücke von nur fünf Fall- bzw. Fundorten vorhanden. Drei Stück des berühmten Pallaseisens Krasnojarsk und zwei Magura bildeten den einzigen Bestand an Meteoreisen, während die Meteorsteine mit L’Aigle, Lasdany und Stannern vertreten waren. Bis Ende 1875 führt der General- katalog des Kgl. Mineralogischen Museums Meteorsteine von acht verschie- denen Fallorten an (Bishopville, Hessle, Kernouve, Knyahinya, L’Aigle, Lasdany, Pultusk und Stannern) und Meteoreisen bereits von 14 Fundorten (Bitburg, Bohumilitz, Braunau, Elbogen, Imilac, Krasnojarsk, Madoc, Magura, Nenntmansdorf, Putnam County, Seeläsgen, Steinbach, Toluca, Zacatecas); In der im Jahre 1882 in den Sitzungsberichten der Isis von A. Purgold veröffentlichten Abhandlung wird ein Verzeichnis über die Meteoritensammlung gegeben, die danach 24 verschiedene Fälle von Meteor- steinen und 34 verschiedene Fälle von Meteoreisen umfafst.
    [Show full text]
  • Metal-Silicate Fractionation and Chondrule Formation
    A756 Goldschmidt 2004, Copenhagen 6.3.12 6.3.13 Metal-silicate fractionation and Fe isotopes fractionation in chondrule formation: Fe isotope experimental chondrules 1 2 2,3 constraints S. LEVASSEUR , B. A. COHEN , B. ZANDA , 2 1 1 1 1 2 2 R.H. HEWINS AND A.N. HALLIDAY X.K. ZHU , Y. GUO , S.H. TANG , A. GALY , R.D. ASH 2 AND R.K O’NIONS 1 ETHZ, Dep. of Earth Sciences, Zürich, Switzerland ([email protected]) 1 Lab of Isotope Geology, MLR, Chinese Academy of 2 Rutgers University, Piscataway, NJ, USA Geological Sciences, 26Baiwanzhuang Road, Beijing, 3 Muséum National d’Histoire Naturelle, Paris, France China ([email protected]) 2 Department of Earth Sciences, Oxford University, Parks Road, Oxford, OX1 3PR, UK Natural chondrules show an Fe-isotopic mass fractionation range of a few δ-units [1,2] that is interpreted either as the result of Fe depletion from metal-silicate Recent studies have shown that considerable variations of fractionation during chondrule formation [1] or as the Fe isotopes exist in both meteoritic and terrestrial materials, reflection of the fractionation range of chondrule precursors and that they are related, through mass-dependent [2]. In order to better understand the iron isotopic fractionation, to a single isotopically homogeneous source[1]. compositions of chondrules we conducted experiments to This implies that the Fe isotope variations recorded in the study the effects of reduction and evaporation of iron on iron solar system materials must have resulted from mass isotope systematics. fractionation incurred by the processes within the solar system About 80mg of powdered slag fayalite was placed in a itself.
    [Show full text]
  • Re-Os ISOTOPIC CONSTRAINTS on the CRYSTALLIZATION HISTORY of IIAB IRON METEORITES
    Lunar and Planetary Science XXVIII 1258.PDF Re-Os ISOTOPIC CONSTRAINTS on the CRYSTALLIZATION HISTORY of IIAB IRON METEORITES. M.I. Smoliar, R.J. Walker, J.W. Morgan. Dept. of Geol., Univ. MD, College Park, MD 20742 The IIAB group represents one of the clearest cases of face bet-ween IIA and IIB subgroups [4]. It also shows an fractional crystallization of metallic magma during core intermediate struc-ture - roughly half of this 2700 kg iron is formation. The Ni-Ir trend in the IIAB group (Fig. 1) has a a single hexahedral crystal of kamasite (typical for IIA sub- very steep negative slope which indicates a correspon- group), while the other part has the coarsest octahedral dingly high Ir distribution coefficient, and, consequently, structure, very similar to Navajo and Mount Joy - the neigh- high sulfur content in the parental metallic magma [1]. Sta- bors of Old Woman from IIB subgroup [5]. Specimens from tistical analyses of the IIAB Ni-Ir trend indicates that the both octahedral and hexahedral parts of Old Woman were observed scatter of datapoints along the ideal crystalli- analyzed. zation line is mostly due to analytical uncertainty. This Fig. 2 shows the Re-Os experimental results for the IIB implies that the Ni-Ir distribution pattern in IIAB irons re- meteorites along with previously publisued IIA isochron flects fractional crystallization, with no significant parallel ([7], age = 4.537 ± 8 Ga, initial 187Os/188Os ratio = 0.09550 or subsequent processes. Originally two separate groups ± 7, MSWD = 1.15). Low age uncertainty and low MSWD were recognized (IIA and IIB) on the basis of their different value imply that the whole IIA subgroup crystallized in a crystallographic structure and the prominent hiatus in the Ir narrow time interval not exceeding 16 m.y.
    [Show full text]
  • Wednesday, March 22, 2017 [W453] MARTIAN METEORITE MADNESS: MIXING on a VARIETY of SCALES 1:30 P.M
    Lunar and Planetary Science XLVIII (2017) sess453.pdf Wednesday, March 22, 2017 [W453] MARTIAN METEORITE MADNESS: MIXING ON A VARIETY OF SCALES 1:30 p.m. Waterway Ballroom 5 Chairs: Arya Udry Geoffrey Howarth 1:30 p.m. Nielsen S. G. * Magna T. Mezger K. The Vanadium Isotopic Composition of Mars and Evidence for Solar System Heterogeneity During Planetary Accretion [#1225] Vanadium isotope composition of Mars distinct from Earth and chondrites. 1:45 p.m. Tait K. T. * Day J. M. D. Highly Siderophile Element and Os-Sr Isotope Systematics of Shergotittes [#3025] The shergottite meteorites represent geochemically diverse, broadly basaltic, and magmatically-derived rocks from Mars. New samples were processed and analyzed. 2:00 p.m. Armytage R. M. G. * Debaille V. Brandon A. D. Agee C. B. The Neodymium and Hafnium Isotopic Composition of NWA 7034, and Constraints on the Enriched End-Member for Shergottites [#1065] Couple Sm-Nd and Lu-Hf isotopic systematics in NWA 7034 suggest that such a crust is not the enriched end-member for shergottites. 2:15 p.m. Howarth G. H. * Udry A. Nickel in Olivine and Constraining Mantle Reservoirs for Shergottite Meteorites [#1375] Ni enrichment in olivine from enriched versus depleted shergottites provide evidence for constraining mantle reservoirs on Mars. 2:30 p.m. Jean M. M. * Taylor L. A. Exploring Martian Mantle Heterogeneity: Multiple SNC Reservoirs Revealed [#1666] The objective of the present study is to assess how many mixing components can be recognized, and address ongoing debates within the martian isotope community. 2:45 p.m. Udry A. * Day J.
    [Show full text]
  • Lost Lake by Robert Verish
    Meteorite-Times Magazine Contents by Editor Like Sign Up to see what your friends like. Featured Monthly Articles Accretion Desk by Martin Horejsi Jim’s Fragments by Jim Tobin Meteorite Market Trends by Michael Blood Bob’s Findings by Robert Verish IMCA Insights by The IMCA Team Micro Visions by John Kashuba Galactic Lore by Mike Gilmer Meteorite Calendar by Anne Black Meteorite of the Month by Michael Johnson Tektite of the Month by Editor Terms Of Use Materials contained in and linked to from this website do not necessarily reflect the views or opinions of The Meteorite Exchange, Inc., nor those of any person connected therewith. In no event shall The Meteorite Exchange, Inc. be responsible for, nor liable for, exposure to any such material in any form by any person or persons, whether written, graphic, audio or otherwise, presented on this or by any other website, web page or other cyber location linked to from this website. The Meteorite Exchange, Inc. does not endorse, edit nor hold any copyright interest in any material found on any website, web page or other cyber location linked to from this website. The Meteorite Exchange, Inc. shall not be held liable for any misinformation by any author, dealer and or seller. In no event will The Meteorite Exchange, Inc. be liable for any damages, including any loss of profits, lost savings, or any other commercial damage, including but not limited to special, consequential, or other damages arising out of this service. © Copyright 2002–2010 The Meteorite Exchange, Inc. All rights reserved. No reproduction of copyrighted material is allowed by any means without prior written permission of the copyright owner.
    [Show full text]
  • March 21–25, 2016
    FORTY-SEVENTH LUNAR AND PLANETARY SCIENCE CONFERENCE PROGRAM OF TECHNICAL SESSIONS MARCH 21–25, 2016 The Woodlands Waterway Marriott Hotel and Convention Center The Woodlands, Texas INSTITUTIONAL SUPPORT Universities Space Research Association Lunar and Planetary Institute National Aeronautics and Space Administration CONFERENCE CO-CHAIRS Stephen Mackwell, Lunar and Planetary Institute Eileen Stansbery, NASA Johnson Space Center PROGRAM COMMITTEE CHAIRS David Draper, NASA Johnson Space Center Walter Kiefer, Lunar and Planetary Institute PROGRAM COMMITTEE P. Doug Archer, NASA Johnson Space Center Nicolas LeCorvec, Lunar and Planetary Institute Katherine Bermingham, University of Maryland Yo Matsubara, Smithsonian Institute Janice Bishop, SETI and NASA Ames Research Center Francis McCubbin, NASA Johnson Space Center Jeremy Boyce, University of California, Los Angeles Andrew Needham, Carnegie Institution of Washington Lisa Danielson, NASA Johnson Space Center Lan-Anh Nguyen, NASA Johnson Space Center Deepak Dhingra, University of Idaho Paul Niles, NASA Johnson Space Center Stephen Elardo, Carnegie Institution of Washington Dorothy Oehler, NASA Johnson Space Center Marc Fries, NASA Johnson Space Center D. Alex Patthoff, Jet Propulsion Laboratory Cyrena Goodrich, Lunar and Planetary Institute Elizabeth Rampe, Aerodyne Industries, Jacobs JETS at John Gruener, NASA Johnson Space Center NASA Johnson Space Center Justin Hagerty, U.S. Geological Survey Carol Raymond, Jet Propulsion Laboratory Lindsay Hays, Jet Propulsion Laboratory Paul Schenk,
    [Show full text]
  • CHAPTER 1 Introduction
    Chemical analysis of organic molecules in carbonaceous meteorites Torrao Pinto Martins, Zita Carla Citation Torrao Pinto Martins, Z. C. (2007, January 24). Chemical analysis of organic molecules in carbonaceous meteorites. Retrieved from https://hdl.handle.net/1887/9450 Version: Corrected Publisher’s Version Licence agreement concerning inclusion of doctoral License: thesis in the Institutional Repository of the University of Leiden Downloaded from: https://hdl.handle.net/1887/9450 Note: To cite this publication please use the final published version (if applicable). ______________________________________________________ CHAPTER 1 ______________________________________________________ Introduction 1.1 Heavenly stones-from myth to science Ancient chronicles, from the Egyptian, Chinese, Greek, Roman and Sumerian civilizations documented the fall1 of meteorites, with Sumerian texts from around the end of the third millennium B. C. describing possibly one of the earliest words for meteoritic iron (Fig. 1.1 Left). Egyptian hieroglyphs meaning “heavenly iron” (Fig. 1.1 Right) found in pyramids together with the use of meteoritic iron in jewellery and artefacts show the importance of meteorites in early Egypt. Meteorites were worshiped by ancient Greeks and Romans, who struck coins to celebrate their fall, with the cult to worship meteorites prevailing for many centuries. For example, some American Indian tribes paid tribute to large iron meteorites, and even in modern days the Black Stone of the Ka´bah in Mecca is worshiped and regarded by Muslims as “an object from heaven”. The oldest preserved meteorite that was observed to fall (19th May 861) was found recently (October 1979) in a Shinto temple in Nogata, Japan. It weighted 472 g and it was stored in a wooden box.
    [Show full text]
  • Aqueous Alteration in Martian Meteorites: Comparing Mineral Relations in Igneous-Rock Weathering of Martian Meteorites and in the Sedimentary Cycle of Mars
    AQUEOUS ALTERATION IN MARTIAN METEORITES: COMPARING MINERAL RELATIONS IN IGNEOUS-ROCK WEATHERING OF MARTIAN METEORITES AND IN THE SEDIMENTARY CYCLE OF MARS MICHAEL A. VELBEL Department of Geological Sciences, 206 Natural Science Building, Michigan State University, East Lansing, Michigan 48824-1115 USA e-mail: [email protected] ABSTRACT: Many of the minerals observed or inferred to occur in the sediments and sedimentary rocks of Mars, from a variety of Mars-mission spacecraft data, also occur in Martian meteorites. Even Martian meteorites recovered after some exposure to terrestrial weathering can preserve preterrestrial evaporite minerals and useful information about aqueous alteration on Mars, but the textures and textural contexts of such minerals must be examined carefully to distinguish preterrestrial evaporite minerals from occurrences of similar minerals redistributed or formed by terrestrial processes. Textural analysis using terrestrial microscopy provides strong and compelling evidence for preterrestrial aqueous alteration products in a numberof Martian meteorites. Occurrences of corroded primary rock-forming minerals and alteration products in meteorites from Mars cover a range of ages of mineral–water interaction, from ca. 3.9 Ga (approximately mid-Noachian), through one or more episodes after ca. 1.3 Ga (approximately mid–late Amazonian), through the last half billion years (late Amazonian alteration in young shergottites), to quite recent. These occurrences record broadly similar aqueous corrosion processes and formation of soluble weathering products over a broad range of times in the paleoenvironmental history of the surface of Mars. Many of the same minerals (smectite-group clay minerals, Ca-sulfates, Mg-sulfates, and the K-Fe–sulfate jarosite) have been identified both in the Martian meteorites and from remote sensing of the Martian surface.
    [Show full text]
  • A Martian Meteorite with Indigenous Organic Carbonaceous Features D
    74th Annual Meteoritical Society Meeting (2011) 5051.pdf NAKHLA: A MARTIAN METEORITE WITH INDIGENOUS ORGANIC CARBONACEOUS FEATURES D. S. McKay1, E. K. Gibson1, K. L. Thomas-Keprta2, S. J. Cle- mett2, , L. Le2, Z. Rahman2, S. J. Wentworth2; 1ARES, NASA/JSC, Mail Code KA, Houston, TX 77058, 2ESCG at NASA/JSC, Mail Code JE23, Houston, TX 77058. Email: [email protected] The Nakhla meteorite possesses discrete, well defined, struc- turally coherent morphologies of carbonaceous phases present within iddingsite alteration zones. Based upon both isotopic measurements and analysis of organic phases the presence of pre- terrestrial organics is now recognized. Within the microcrystal- line layers of Nakhla’s iddingsite, discrete clusters of salt crystals are present. These salts are predominantly halite (NaCl) with minor MgCl2 crystals. Some CaSO4, likely gypsum, appears to be partially intergrown with some of the halite. EDX mapping shows discrete C-rich features are interspersed among these crys- tals. A hollow semi-spherical ‘bowl’ structure (~ 3µm ) has been identified and analyzed after using a focused ion beam (FIB) to cut a transverse TEM thin section of the feature and the underly- ing iddingsite. TEM/EDX analysis reveals that the feature is pri- marily carbonaceous containing C with lesser amounts of Si, S, Ca, Cl, F, Na, and minor Mn and Fe; additionally a small peak consistent with N, which has been previously seen in Nakhla car- bonaceous matter, is also present. Selected area electron diffrac- tion (SAED) shows that this C-rich material is amorphous (lack- ing any long-range crystallographic order) and is not graphite or carbonate.
    [Show full text]