Bulk Densities of Meteorites in the Vatican Collection and ... PDF Densities and Porosities of Ordinary Chondrites; Do High ... As one possible solution for the presence of " shock" veins in seemingly unshocked ordinary chondrites, Rubin Based on these studies the bulk density of the. We report and describe an L6 ordinary chondrite fall that occurred in Ardón, León province, Spain (longitude 5.5605°W, latitude 42.4364°N) on July 9th, 1931. We report density and porosity measurements of 42 pieces of 30 ordinary chondrites and provide a quantification of the errors of the gas pycnometer method used in this study. The grain density, bulk density, and porosity were measured for 19 ordinary chondrite and 5 carbonaceous chondrite meteorites, and the grain density was measured for an additional 30 ordinary chondrite and 7 carbonaceous chondrite meteorites. The average grain density of our OC samples was 3.51 g/cm3. This meteorite is classified as an LL5 ordinary chondrite with shock stage S4/5. The unweathered ordinary chondrites generally have porosities ranging from 5 to 25%, while the . Bulk density is 3.23 g/cm 3, and grain density is 3.61 g/cm 3. 1999; Wilkison et al. In this study, we present new measurements of ordinary chondrite densities. I compared the bulk density of the asteroid 433 Eros (2.67 ± 0.03 g/cm 3 ) with that of ordinary chondrites (3.40 g/cm 3 ), to estimate that the total porosity of the asteroid is 21 33%. PDF Physical Property Comparison of Ordinary Chondrite Classes ... The bulk densities of 82 samples of 72 ordinary chondrites (OCs) were measured to an accuracy of ~1% using a modified Archimedian method. posted September 30, 2005 Soon after the Portales Valley meteorite fell in 1998, it was classified as one of the most common types of meteorites, an H6 ordinary chondrite. Orgueil. Chondrule - an overview | ScienceDirect Topics The PE-criterion is related to different types of material and thus may help decide whether a meteorite fall is probable or not. We performed impact disruption experiments on pieces from eight different anhydrous chondritic meteorites - four weathered ordinary chondrite finds from North Africa (NWA791, NWA620, NWA869 and MOR001), three almost unweathered ordinary chondrite falls (Mbale, Gao, and Saratov), and an almost unweathered carbonaceous chondrite fall (Allende). OSTI.GOV Journal Article: Pore size distribution in an uncompacted equilibrated ordinary chondrite Journal Article: Pore size distribution in an uncompacted equilibrated ordinary chondrite Density, magnetic susceptibility, and the characterization ... Physical properties of meteorites—Applications in space ... We report and describe an L6 ordinary chondrite fall that occurred in Ardon, Leon province, Spain (longitude 5.5605 degrees W, latitude 42.4364 degrees N) on July 9th, 1931. 4.25 ( ± 0.02) Pallasites. Abstract-Densities and porosities of meteorites are physical properties that can be used to infer characteristics of asteroid interiors. The Cali Meteorite: Luminescence of a recently fallen H/L ... (subtype 3.05) ungrouped ordinary chondrite which contains two apparently distinct lithologies. Grain density and magnetic susceptibility combined provide a reliable method of classifying unweathered ordinary . This classification is based on the abundance of metallic iron and PDF Lunar and Planetary Science XXIX 1730.pdf ORDINARY ... Abstract— Densities and porosities of meteorites are physical properties that can be used to infer characteristics of asteroid interiors. This rare (less than 5% of all meteorite falls) class of meteorites are a time capsule from the earliest days in the formation of our solar system. Morphological Evolution of Ordinary Chondrite ... Of all the measured OCs data, densities, and porosities of 37 OC falls (14 H, 17 L, and 6 LL), 31 non-Antarctic finds . The Ardón L6 ordinary chondrite: A long-hidden Spanish ... In the picture below, one tip has been cut off, exposing the lighter gray and speckled interior of the meteorite. The unweathered ordinary chondrites generally have porosities ranging from 5 to 25%, while the carbonaceous chondrites have porosities in the range 10 to . 1. In ordinary chondrites, this rapid and non-destructive measurement essentially determines the amount of metal in the sample, which occurs in a very narrow range for each chondrite class (though terrestrial weathering can result in a variable decrease in susceptibility, especially in finds). Physical Properties Data: Density and Porosity. Measured porosities in this survey ranged from effectively 0 to 13%, with most stones falling below 7%. One ordinary chondrite Chondrite meteorites are the most common accounting for 83.6% of falls. An overview of Ordinary Chondrites: Unequilibrated Ordinary Chondrites, Ll Ordinary Chondrites, L6 Ordinary Chondrites, 43° 53′ N., 1° 23′ E. This very rare carbonaceous chondrite. Density, porosity, and pore morphology constitute the basic physical properties of meteorites. The magnetic susceptibility and grain density of the meteorite are higher than typical LL chondrites, however together with the physical properties of the rock, Dingle Dell . The preatmospheric radius of Huaxi is ~11 cm, corresponding to ~21 kg. dominantly control variations of density within the OC subgroups. ordinary chondrites were rare, largely unpublished, and gave little indication of the error in the measurement technique. In large cut meteorite slabs, the darker of these, lithology A, looks to host the second, much lighter in color, lithology B (upper left, Fig. The average ablation for 83 ordinary chondrites was found to be equal to 78.4 +3.1 -3.4 %. recoveries of the Tamdakht H5 chondrite (Weisberg et al. For L'Aigle L6 chondrite, for example, it was predicted that grain densities for the whole rock is equal to 3.59 g/cm3, and 3.33 g/cm3 for the silicates [11]. The Villalbeto de la Peña meteorite has been classified as a moderately shocked (S4) L6 ordinary chondrite (Russell et al. 2006) and from the Tenham L6 chondrite. Meteorite porosity and density can provide insight into how asteroid materials respond to regolith-forming and shock processes. ble with the grain density of silicates of other ordinary chondrites. 2004;Llorca et al. - L (Low Iron -Ordinary Chondrite) - LL (Low Iron, Low metal Ordinary Chondrite) - H (high iron Ordinary Chondrite) • The unit models are also developed for rock analogs like basalt that can serve as a means to validate these models. The analysis of the data obtained demonstrated that the average preatmospheric mass of chondrites is M ∼ 90 kg, and for 95% of the meteorites, the preatmospheric masses fall in the interval ∼2-3500 kg, which corresponds to radii from ∼5 to ∼60 cm. The properties of ordinary chondrites (OC) reflect both nebular and asteroidal processes. In ordinary chondrites, this rapid and non-destructive measurement essentially determines the amount of metal in the sample, which occurs in a very narrow range for each chondrite class (though terrestrial weathering can result in a variable decrease in susceptibility, especially in finds). 2006). Of the studied meteorites, Tamdakht is an average H chondrite. A third example is Arcadia (LL6) (Fig. We report density and porosity measurements of 42 pieces of 30 ordinary chondrites and provide a quantification of the errors of the gas pycnometer method used in this study. The 42 ordinary chondrite meteorites in The ordinary chondrites are thought to have originated from three parent asteroids, with the fragments making up the H chondrite, L chondrite and LL chondrite groups respectively. Structural porosity, best estimated to be ∼20%, is constrained to be between 6% and 33%. 2003; Wilkison and Robinson 2000) have shown that L . The measurement of meteorite physical properties (i.e. Abstract— Bulk and grain densities of 132 ordinary chondrites from the Vatican Observatory collection were measured and compared with their magnetic susceptibility (for the most part using previously measured values; ten new susceptibility measures were taken for this study). [3] showed that ordinary chondrite falls group into three distinct regions (corresponding to H, L and LL chondrites, Shock‐blackened meteorites are less porous than other meteorites. Fig. (a) The Semarkona L3.0 ordinary chondrite in PL showing a high density of chondrules with different textures (textural types) including barred and porphyritic chondrules, surrounded by opaque matrix. Huaxi has been classified as an H5 ordinary chondrite, with a shock grade S2, and weathering W0. (21.9KB) Note that the bulk density of a given meteorite varies from sample to sample, and even more among meteorites within a class (see mesosiderites; but even within an ordinary chondrite class, bulk density can vary by 0.5 g/cm3) and that, to date, all meteorites measured are significantly more dense than Ida or Phobos. Ordinary chondrites do not show any correlation of porosity (model or measured) with petrographic grade or sample size (over a range from 0.2 g to 2 kg). CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Abstract: In this review, we summarize the data published up to December 2001 on the porosity and density of stony meteorites. 1). Manuscript Generator Sentences Filter • CT scans will be performed on ground based meteorites to Unfortunately, there are large uncertainties in chondrule speed and the provenance of the joined chondrules, which make estimates of the chondrule density very uncertain. Ordinary Chondrites consist primarily of olivine (40% to 50%), pyroxene (15% to 25%), Fe/Ni alloys of kamacite and taenite Porosities for ECs are on the low end for the chondrite group. (c) The Peekskill density, porosity, magnetic susceptibility) supplements detailed chemical and isotopic analyses for small samples (thin sections or ~300 mg portions) by providing whole-rock data for samples massing in the tens of grams. OC chondrite chondrules have densities between 3.15 and 3.26 g/cm 3, as may be expected from their mineral and glass compositions 2. Most ordinary chondrites are in the range 3.0 to 3.7 g/cm 3, which is denser than most terrestrial rocks. Porosity of Eros Wilkison and team used two sets of density and porosity data for ordinary chondrite meteorites from Consolmagno and Britt (1998) and Flynn and others (1999) as their starting point to estimate the porosity of Eros. temperatures (> 1000° C). Ghadamis HAH 346 Meteorite Fall 2019 Ordinary chondrite L6 63.75 grams w/COA. Typically, ordinary chondrites have a porosity of just under 10%, while most carbonaceous Abstract— Bulk and grain densities of 132 ordinary chondrites from the Vatican Observatory collection were measured and compared with their magnetic susceptibility (for the most part using previously measured values; ten new susceptibility measures were taken for this study). Kink bands, and "curved and jogged" dislocations attributed to climb, were observed in a TEM study of olivine in the Saint-Séverin (LL6) chondrite [12]. Determining the volume of soluble, fragile and/or . The grain density, bulk density, and porosity were measured for 19 ordinary chondrite and 5 carbonaceous chondrite meteorites, and the grain density was measured for an additional 30 ordinary chondrite and 7 carbonaceous chondrite meteorites. Consolmagno et al. Acoustic Velocities. Enstatite Chondrites: The enstatite chondrite data in hand are consistent with the possibility that they participated in the same physical history as the ordi- In the case of ordinary chondrites, magnetic susceptibility in conjunction with grain density (also largely dependent on the quantity of dense iron metal relative to less-dense silicates and other phases) has been shown to serve as a viable tool for rapid classification of stones into H, L, and LL subgroups (Consolmagno et al. Image not available. The 5.5 g single stone was kept hidden for 83 yr by Rosa Gonzalez Perez, at the time an 11 yr old who had observed the fall and had recovered the meteorite. The lowest magnetic susceptibility values are characteristic to achondrites, followed by the chondrites, stony-irons and irons. Together, these measurements imply Dingle Dell has a porosity of 10.5%, which is close to the mean for lightly shocked, unweathered ordinary chondrite falls. (b) The Semarkona chondrite in PL showing a large indented cryptocrystalline chondrule, porphyritic chondrules, and matrix. About 46% of ordinary chondrite falls belong to this group, which makes them the most common type of meteorite to fall to earth. Bulk density measurements of eleven pieces of one fall, Pultusk (H group . 2003; Wilkison and Robinson 2000) have shown that L . The average bulk density of ordinary chondrites is 3-4 g/cm3, stony-irons is 4-6 g/cm3, and irons is 7-8 g/cm3 [3]. In over half of these, the chondrules that collided have . Grain density versus bulk mass magnetic susceptibility for six fragments of the Grimsby meteorite (modified H, L, LL chondrite fields from Consolmagno et al., 2008). 4.76 (± 0.10) Irons: Iron meteorites are composed primarily of an Iron/Nickel blend which will often have a density of approximately 7g/cm 3 - 8g/cm 3. Abstract. All Antarctic meteorites have 1.5-2 times larger po-rosities caused by weathering. The grain density and bulk density are all slightly higher than the corresponding values reported by Macke, though the porosity is comparable. Chelyabinsk and the studied Antarctic meteorites have lower bulk and higher grain densities yielding above average The 5.5 g single stone was kept hidden for 83 yr by Rosa González Pérez, at the time an 11 Results:We measured the grain densities, bulk densities, and porosities of 42 pieces of 30 ordinary chondrites. INTRODUCTION Ordinary chondrites (OCs), the most common type of meteorites collected, have been suggested to originate from the most prevalent asteroids (S-type) in the inner asteroid belt (Wetherill and Chapman, 1988; Pellas, 1988a,b). By comparison, ordinary chondrites average about 9% porosity with a range that exceeds 20%, and carbonaceous chondrites tend to much higher porosities. Grain density and magnetic susceptibility combined provide a reliable method of classifying unweathered ordinary chondrites. Forest City (H5 ordinary chondrite, below) is covered by a fusion coating. A spate of recent studies of ordinary-chondrite density and porosity (e.g., Britt and Consolmagno 2003;Flynn et al.

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