Hf–W Thermochronometry: II. Accretion and Thermal History of the Acapulcoite–Lodranite Parent Body
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New Major and Trace Element Data from Acapulcoite-Lodranite Clan
52nd Lunar and Planetary Science Conference 2021 (LPI Contrib. No. 2548) 1307.pdf New Major and Trace Element Data from Acapulcoite-Lodranite Clan Meteorites: Evidence for Melt-Rock Reaction Events and Early Collisional Fragmentation of the Parent Body Michael P. Lucas1, Nick Dygert1, Nathaniel R. Miller2, and Harry Y. McSween1, 1Department of Earth & Planetary Sciences, University of Tennessee, Knoxville, [email protected], 2Department of Geological Sciences, Univer- sity of Texas at Austin. Introduction: New major and trace element data illumi- patterns exhibit negative Eu anomalies. REE patterns are nate the magmatic and thermal evolution of the acapul- generally consistent among the three groups, however coite-lodranite parent body (ALPB). We observe major comparison of calculated equilibrium melts for acapulco- and trace element disequilibrium in the acapulcoite and ite and transitional cpx and opx demonstrates disequilib- transitional groups that provide evidence for melt infil- rium partitioning in those samples, especially for light- tration and melt-rock reaction processes. In lodranites, REEs in cpx. In contrast, lodranites are in apparent trace which represent sources of the infiltrating melts, we ob- element equilibrium (Fig 1b). They are depleted in serve rapid cooling from high temperatures (hereafter REE+Y relative to acapulcoite-transitional samples in temps), consistent with collisional fragmentation of the cpx (Fig. 1a), and display consistent REE abundances parent body during differentiation. except NWA 5488, which -
U-Pb Age, Re-Os Isotopes, and Hse Geochemistry of Northwest Africa 6704
44th Lunar and Planetary Science Conference (2013) 1841.pdf U-PB AGE, RE-OS ISOTOPES, AND HSE GEOCHEMISTRY OF NORTHWEST AFRICA 6704. T. Iizuka1, Y. Amelin2, I. S. Puchtel3, R. J. Walker3, A. J. Irving4, A. Yamaguchi5, Y. Takagi6, T. Noguchi6 and M. Kimura5. 1Department of Earth and Planetary Science, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan ([email protected]), 2Research School of Earth Sciences, Australian National University, Canberra ACT, Australia, 3Department of Geology, University of Maryland, College Park, MD, USA, 4Department of Earth and Space Sciences, University of Washington, Seattle, WA, USA, 5National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan, 6College of Science, Ibaraki University, Bunkyo 2-1-1, Mito, Ibaraki 310-8512, Japan. Introduction: Northwest Africa (NWA) 6704 is a of Maryland using standard high temperature acid diges- very unusual ungrouped fresh achondrite. It consists of tion, chemical purification and mass spectrometry tech- abundant coarse-grained (up to 1.5 mm) low-Ca py- niques [3]. The quantities of each of the HSE was at roxene, less abundant olivine, chromite, merrillite and least 1000 times greater than the blanks measured at the interstitial sodic plagioclase. Minor minerals are same time. Thus, blanks had no impact on the measure- awaruite, heazlewoodite, and pentlandite. Raman spec- ments. Accuracy and precision of Ir, Ru, Pt and Pd con- troscopy shows that a majority of the low-Ca pyroxene centrations are estimated to be <2%, of Re <0.4%, and is orthopyroxene. Bulk major element abundances are of Os <0.1%. -
Petrography and Mineral Chemistry of Escalón Meteorite, an H4 Chondrite, México
148 Reyes-SalasRevista Mexicana et al. de Ciencias Geológicas, v. 27, núm. 1, 2010, p. 148-161 Petrography and mineral chemistry of Escalón meteorite, an H4 chondrite, México Adela M. Reyes-Salas1,*, Gerardo Sánchez-Rubio1, Patricia Altuzar-Coello2, Fernando Ortega-Gutiérrez1, Daniel Flores-Gutiérrez3, Karina Cervantes-de la Cruz1, Eugenio Reyes4, and Carlos Linares5 1 Universidad Nacional Autónoma de México, Instituto de Geología, Del. Coyoacán, 04510 México D.F., Mexico. 2 Universidad Nacional Autónoma de México, Centro de Investigación en Energía, Campus Temixco, Priv. Xochicalco s/n, 62580 Temixco Morelos, Mexico. 3 Universidad Nacional Autónoma de México, Instituto de Astronomía, Del. Coyoacán, 04510 México D.F., Mexico. 4 Universidad Nacional Autónoma de México, Facultad de Química, Del. Coyoacán, 04510 México D.F., Mexico. 5 Universidad Nacional Autónoma de México, Instituto de Geofísica, Del. Coyoacán, 04510 México D.F., Mexico. * [email protected] ABSTRACT The Escalón meteorite, a crusted mass weighing 54.3 g, was recovered near Zona del Silencio in Escalón, state of Chihuahua, México. The stone is an ordinary chondrite belonging to the high iron group H, type 4. Electron microprobe analyses of olivine (Fa18.1) and pyroxene (Fs16.5), phosphate, plagioclase, opaque phases, matrix and chondrule glasses are presented. The metal phases present are kamacite (6.08 % Ni), taenite (31.66 % Ni), high nickel taenite (50.01 % Ni) and traces of native Cu. The chondrules average apparent diameter measures 0.62 mm. X-ray diffraction pattern shows olivine, pyroxene and kamacite. Alkaline-type glass is found mainly in chondrules. This meteorite is a stage S3, shock-blackened chondrite with weathering grade W0. -
Chondrule Sizes, We Have Compiled and Provide Commentary on Available Chondrule Dimension Literature Data
Invited review Chondrule size and related physical properties: a compilation and evaluation of current data across all meteorite groups. Jon M. Friedricha,b,*, Michael K. Weisbergb,c,d, Denton S. Ebelb,d,e, Alison E. Biltzf, Bernadette M. Corbettf, Ivan V. Iotzovf, Wajiha S. Khanf, Matthew D. Wolmanf a Department of Chemistry, Fordham University, Bronx, NY 10458 USA b Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY 10024 USA c Department of Physical Sciences, Kingsborough College of the City University of New York, Brooklyn, NY 11235, USA d Graduate Center of the City University of New York, 365 5th Ave, New York, NY 10016 USA e Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964 USA f Fordham College at Rose Hill, Fordham University, Bronx, NY 10458 USA In press in Chemie der Erde – Geochemistry 21 August 2014 *Corresponding Author. Tel: +718 817 4446; fax: +718 817 4432. E-mail address: [email protected] 2 ABSTRACT The examination of the physical properties of chondrules has generally received less emphasis than other properties of meteorites such as their mineralogy, petrology, and chemical and isotopic compositions. Among the various physical properties of chondrules, chondrule size is especially important for the classification of chondrites into chemical groups, since each chemical group possesses a distinct size-frequency distribution of chondrules. Knowledge of the physical properties of chondrules is also vital for the development of astrophysical models for chondrule formation, and for understanding how to utilize asteroidal resources in space exploration. To examine our current knowledge of chondrule sizes, we have compiled and provide commentary on available chondrule dimension literature data. -
Petrogenesis of Acapulcoites and Lodranites: a Shock-Melting Model
Geochimica et Cosmochimica Acta 71 (2007) 2383–2401 www.elsevier.com/locate/gca Petrogenesis of acapulcoites and lodranites: A shock-melting model Alan E. Rubin * Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, USA Received 31 May 2006; accepted in revised form 20 February 2007; available online 23 February 2007 Abstract Acapulcoites are modeled as having formed by shock melting CR-like carbonaceous chondrite precursors; the degree of melting of some acapulcoites was low enough to allow the preservation of 3–6 vol % relict chondrules. Shock effects in aca- pulcoites include veins of metallic Fe–Ni and troilite, polycrystalline kamacite, fine-grained metal–troilite assemblages, metal- lic Cu, and irregularly shaped troilite grains within metallic Fe–Ni. While at elevated temperatures, acapulcoites experienced appreciable reduction. Because graphite is present in some acapulcoites and lodranites, it seems likely that carbon was the principal reducing agent. Reduction is responsible for the low contents of olivine Fa (4–14 mol %) and low-Ca pyroxene Fs (3–13 mol %) in the acapulcoites, the observation that, in more than two-thirds of the acapulcoites, the Fa value is lower than the Fs value (in contrast to the case for equilibrated ordinary chondrites), the low FeO/MnO ratios in acapulcoite olivine (16–18, compared to 32–38 in equilibrated H chondrites), the relatively high modal orthopyroxene/olivine ratios (e.g., 1.7 in Monument Draw compared to 0.74 in H chondrites), and reverse zoning in some mafic silicate grains. Lodranites formed in a similar manner to acapulcoites but suffered more extensive heating, loss of plagioclase, and loss of an Fe–Ni–S melt. -
The Hamburg Meteorite Fall: Fireball Trajectory, Orbit and Dynamics
The Hamburg Meteorite Fall: Fireball trajectory, orbit and dynamics P.G. Brown1,2*, D. Vida3, D.E. Moser4, M. Granvik5,6, W.J. Koshak7, D. Chu8, J. Steckloff9,10, A. Licata11, S. Hariri12, J. Mason13, M. Mazur3, W. Cooke14, and Z. Krzeminski1 *Corresponding author email: [email protected] ORCID ID: https://orcid.org/0000-0001-6130-7039 1Department of Physics and Astronomy, University of Western Ontario, London, Ontario, N6A 3K7, Canada 2Centre for Planetary Science and Exploration, University of Western Ontario, London, Ontario, N6A 5B7, Canada 3Department of Earth Sciences, University of Western Ontario, London, Ontario, N6A 3K7, Canada ( 4Jacobs Space Exploration Group, EV44/Meteoroid Environment Office, NASA Marshall Space Flight Center, Huntsville, AL 35812 USA 5Department of Physics, P.O. Box 64, 00014 University of Helsinki, Finland 6 Division of Space Technology, Luleå University of Technology, Kiruna, Box 848, S-98128, Sweden 7NASA Marshall Space Flight Center, ST11, Robert Cramer Research Hall, 320 Sparkman Drive, Huntsville, AL 35805, USA 8Chesapeake Aerospace LLC, Grasonville, MD 21638, USA 9Planetary Science Institute, Tucson, AZ, USA 10Department of Aerospace Engineering and Engineering Mechanics, University of Texas at Austin, Austin, TX, USA 11Farmington Community Stargazers, Farmington Hills, MI, USA 12Department of Physics and Astronomy, Eastern Michigan University, Ypsilanti, MI, USA 13Orchard Ridge Campus, Oakland Community College, Farmington Hills, MI, USA 14NASA Meteoroid Environment Office, Marshall Space Flight Center, Huntsville, Alabama 35812, USA Accepted to Meteoritics and Planetary Science, June 19, 2019 85 pages, 4 tables, 15 figures, 1 appendix. Original submission September, 2018. 1 Abstract The Hamburg (H4) meteorite fell on January 17, 2018 at 01:08 UT approximately 10km North of Ann Arbor, Michigan. -
Frontier Mountain Meteorite Specimens of the Acapulcoite-Lodranite Clan: Petrography, Pairing, and Parent-Rock Lithology of an Unusual Intrusive Rock
Meteoritics & Planetary Science 43, Nr 4, 731–744 (2008) Abstract available online at http://meteoritics.org Frontier Mountain meteorite specimens of the acapulcoite-lodranite clan: Petrography, pairing, and parent-rock lithology of an unusual intrusive rock Alessandro BURRONI and Luigi FOLCO* Museo Nazionale dell’Antartide, Università di Siena, Via Laterina 8, I-53100 Siena, Italy *Corresponding author. E-mail: [email protected] (Received 31 January 2007; revision accepted 10 October 2007) Abstract–In this paper we reconstruct the heterogeneous lithology of an unusual intrusive rock from the acapulcoite-lodranite (AL) parent asteroid on the basis of the petrographic analysis of 5 small (<8.3 g) meteorite specimens from the Frontier Mountain ice field (Antarctica). Although these individual specimens may not be representative of the parent-rock lithology due to their relatively large grain size, by putting together evidence from various thin sections and literature data we conclude that Frontier Mountain (FRO) 90011, FRO 93001, FRO 99030, and FRO 03001 are paired fragments of a medium- to coarse-grained igneous rock which intrudes a lodranite and entrains xenoliths. The igneous matrix is composed of enstatite (Fs13.3 ± 0.4 Wo3.1 ± 0.2), Cr-rich augite (Fs6.1 ± 0.7 Wo42.3 ± 0.9), and oligoclase (Ab80.5 ± 3.3 Or3.2 ± 0.6). The lodranitic xenoliths show a fine-grained (average grain size 488 ± 201 µm) granoblastic texture and consist of olivine Fa9.5 ± 0.4 and Fe,Ni metal and minor amounts of enstatite Fs12.7 ± 0.4 Wo1.8 ± 0.1, troilite, chromite, schreibersite, and Ca-phosphates. Crystals of the igneous matrix and lodranitic xenoliths are devoid of shock features down to the scanning electron microscope scale. -
Marek ZBIK1,2, Peter SELF3
MINERALOGIA POLONICA Vol. 36, No 1, 2005 PL ISSN 0032-6267 Marek ZBIK1,2, Peter SELF3 HIGH RESOLUTION X-RAY MICROTOMOGRAPHY ANALYSIS IN NON-DESTRUCTIVE INVESTIGATION OF INTERNAL STRUCTURE IN TWO CHONDRITES Abstract.Acomparison of the internal structure of two stony meteorites has been carried out using computer-aided X-ray microtomography (X-ray CT). The meteorites are both chondrites of the petrological type 5 with one (Baszkowka) being a group L chondrite and the other (Pultusk) being a group H chondrite. The volume of metal grains in the Pultusk meteorite (7.7 vol.%) is larger than that in the Baszkowka meteorite (5.1 vol.%). The metal grains in the Baszkowka meteorite are generally larger than those in the Pultusk meteorite. The Baszkowka meteorite has a much higher void volume (8.7 vol.%) than the Pultusk meteorite (3.4 vol.%). The voids in the Pultusk meteorite are generally much smaller than the voids in the Baszkowka meteorite. X-ray CT shows that the two meteorites, despite being structurally different, reveal in each similar correlations between the structural characteristics of the metal grains and voids. From an analysis of the structural features of both meteorites it is postulated that more regularly shaped intergranular voids were formed at the same time as the regularly shaped metal and silicate grains. It means they had formed when the meteorite parent body had been assembled, i.e. before metamorphism inside the meteorite parent bodies. It is also postulated that the less porous, high aspect ratio void systems seen in the Pultusk meteorite (elongated, fissures) formed after pressure metamorphic period and during a shock event that fragmented the parent body of this meteorite. -
The Origin and History of Ordinary Chondrites: a Study by Iron Isotope Measurements of Metal Grains from Ordinary Chondrites
Available online at www.sciencedirect.com Geochimica et Cosmochimica Acta 72 (2008) 4440–4456 www.elsevier.com/locate/gca The origin and history of ordinary chondrites: A study by iron isotope measurements of metal grains from ordinary chondrites K.J. Theis a,*, R. Burgess a, I.C. Lyon a, D.W. Sears b a School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK b Arkansas Center for Space and Planetary Science and Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR 72701, USA Received 15 August 2007; accepted in revised form 30 May 2008; available online 14 June 2008 Abstract Chondrules and chondrites provide unique insights into early solar system origin and history, and iron plays a critical role in defining the properties of these objects. In order to understand the processes that formed chondrules and chondrites, and introduced isotopic fractionation of iron isotopes, we measured stable iron isotope ratios 56Fe/54Fe and 57Fe/54Fe in metal grains separated from 18 ordinary chondrites, of classes H, L and LL, ranging from petrographic types 3–6 using multi-col- lector inductively coupled plasma mass spectrometry. The d56Fe values range from À0.06 ± 0.01 to +0.30 ± 0.04& and d57Fe values are À0.09 ± 0.02 to +0.55 ± 0.05& (relative to IRMM-014 iron isotope standard). Where comparisons are possible, these data are in good agreement with published data. We found no systematic difference between falls and finds, suggesting that terrestrial weathering effects are not important in controlling the isotopic fractionations in our samples. -
Grove Mountains (Grv) 020043: Acapulcoite-Lodranite Genesis from the View of the Most Primitive Member
51st Lunar and Planetary Science Conference (2020) 2130.pdf GROVE MOUNTAINS (GRV) 020043: ACAPULCOITE-LODRANITE GENESIS FROM THE VIEW OF THE MOST PRIMITIVE MEMBER. T.J. McCoy1, C.M. Corrigan1, T.L. Dickinson2, G.K. Benedix3, D.L. Schrader4 and J. Davidson4, 1Dept. of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560-0119 USA ([email protected]), 2Science Matters Consulting, LLC, Washington DC 20016 USA, 3Curtin University, Bentley, WA 6102, Australia, 4Arizona State University, Tempe AZ 85287-1404 USA. Introduction: The formation of acapulcoites and An unusual, well-defined radial chondrule (Fig. 2) lodranites by partial melting of a chondritic precursor consists of a core of low- and high-Ca pyroxene rimmed has long been recognized from their broadly chondritic by SiO2 and mantled by low- and high-Ca pyroxene and mineralogy and bulk composition. Rarely, relict plagioclase. Chondrules range in diameter from ~200 to chondrules have been observed in these meteorites [1– ~2000 μm, with the mode between 400 and 500 μm and 5]. In a recent survey of acapulcoites and lodranites, [6] the mean diameter is 690 μm, essentially identical to the highlighted Grove Mountains (GRV) 020043, which results of [7]. was reclassified by [7] as a possible chondritic precursor to acapulcoites. The meteorite is remarkable for the abundance of chondrules and chondrule fragments (~62 vol.%; [7]) and mineral compositions (Fa10.7, Fs10.8) intermediate between enstatite and ordinary chondrites. [7] reported isotopic compositions for oxygen and chromium that fall within the field of acapulcoites and lodranites. Our primary motivation in studying GRV 020043 is examining several long-standing questions in acapulcoite-lodranite petrogenesis that can be uniquely addressed by such a primitive member of the group. -
Identification of Meteorite Source Regions in the Solar System
Icarus 311 (2018) 271–287 Contents lists available at ScienceDirect Icarus journal homepage: www.elsevier.com/locate/icarus Identification of meteorite source regions in the Solar System ∗ Mikael Granvik a,b, , Peter Brown c,d a Department of Physics, P.O. Box 64, 0 0 014 University of Helsinki, Finland b Department of Computer Science, Electrical and Space Engineering, Luleå University of Technology, Kiruna, Box 848, S-98128, Sweden c Department of Physics and Astronomy, University of Western Ontario, London N6A 3K7, Canada d Centre for Planetary Science and Exploration, University of Western Ontario, London N6A 5B7, Canada a r t i c l e i n f o a b s t r a c t Article history: Over the past decade there has been a large increase in the number of automated camera networks that Received 27 January 2018 monitor the sky for fireballs. One of the goals of these networks is to provide the necessary information Revised 6 April 2018 for linking meteorites to their pre-impact, heliocentric orbits and ultimately to their source regions in the Accepted 13 April 2018 solar system. We re-compute heliocentric orbits for the 25 meteorite falls published to date from original Available online 14 April 2018 data sources. Using these orbits, we constrain their most likely escape routes from the main asteroid belt Keywords: and the cometary region by utilizing a state-of-the-art orbit model of the near-Earth-object population, Meteorites which includes a size-dependence in delivery efficiency. While we find that our general results for escape Meteors routes are comparable to previous work, the role of trajectory measurement uncertainty in escape-route Asteroids identification is explored for the first time. -
UNIVERSITY of CALIFORNIA, SAN DIEGO Primitive and Differentiated
UNIVERSITY OF CALIFORNIA, SAN DIEGO Primitive and differentiated achondrite meteorites and partial melting in the early Solar System A Thesis submitted in partial satisfaction of the requirements for the degree Master of Science in Earth Sciences By Christopher Andrew Corder Committee in charge: Professor James M. D. Day, Chair Professor Geoffrey W. Cook Professor David R. Stegman 2015 © Christopher Andrew Corder, 2015 All rights reserved. The Thesis of Christopher Corder is approved and it is acceptable in quality and form for publication on microfilm and electronically: Chair University of California, San Diego 2015 iii Dedication This manuscript would be far from complete without thanking those who helped set the stage for the many hours of work it documents, and those thank-yous would be far from complete without recognizing my parents and their unwavering support throughout years of study. I know I was the one in the lab, but I never would have made it there, or to my defense, or through any of the long days and nights if it weren’t for you both. Thank you, so much. I’d love to thank my entire family, especially Stephen. You’re a brother Stephen, and you encourage me more than you know. Whenever it seemed like research was going nowhere, you were there to remind me why science is always a worthwhile endeavor. Even more importantly you remind me, by example, that there are exceptional people in this world. Many thanks are due to the lab group I worked with and other smart folks at SIO. First of all, thank you James for trusting this intriguing suite of meteorites to my care.