Temat: L-chondrite - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Bulk chemical composition of Sołtmany chondrite
Autorzy:: Przylibski, T. A.
Łuszczek, K.
Tematy:: meteorite
ordinary chondrite
L-chondrite
bulk composition
meteorite fall
observed fall; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/411498.pdf Link otwiera się w nowym oknie
Opis:: The authors examined the bulk chemical composition of the Sołtmany chondrite which fell on April 30th, 2011 in Northern Poland. Based on the analysis of 47 elements, it was concluded that Sołtmany is representative of L-type of ordinary chondrites. However, compared to the average values observed in other L-type ordinary chondrites, Sołtmany displays higher content of Ni, P, Cd, Pb, and As. The Ni and P content closely resembles typical values for H-type ordinary chondrites. Furthermore, Sołtmany displays other distinct properties including very low Zn content and lower contents of Mo and Zr than the average values found in other L-type ordinary chondrites. Consistent with other L-type ordinary chondrites, the absolute content of REE in Sołtmany is higher than that of CI-type carbonaceous chondrites while the REE trend lines for both Sołtmany and CI-chondrites are similar. Due to similar times of year of when both falls took place and the proximity of their strewn fields, the chemical composition of Sołtmany was compared with that of Jesenice, an L6 ordinary chondrite which fell on April 9th, 2009 in Europe. The analysis led to a conclusion that Sołtmany and Jesenice are not launch-paired. Nevertheless, even though they do not represent fragments of the same meteoroid, their origin on a common parent body (an asteroid – planetesimal) cannot be conclusively ruled out on the sole basis of their bulk chemical composition.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Charakterystyka petrologiczna i chemiczna meteorytu Antonin – klasyfikacja oraz zarys historii termicznej i uderzeniowej
Petrology and chemistry of the Antonin meteorite – classification and reconstruction of thermal-collisional history
Autorzy:: Krzesińska, Agata
Tematy:: Antonin
L5 chondrite
meteorite; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/2195010.pdf Link otwiera się w nowym oknie
Opis:: Meteorite Antonin fell on 15th July 2021 in Poland. The bolide was observed and recorded by cameras of European Bolide Network, Astronomical Institute of Czech Academy of Sciences. Soon after the fall, specimen of meteorite was recovered and delivered for classification. In this paper, analytical results collected in order to classify the Antonin meteorite are reported. Antonin is L5 ordinary chondrite with deformation degree S3 or S4. This paper includes reports of heterogeneous texture of chondrite and reports on chemical composition of minerals: olivine, low-Ca pyroxene, diopside and glasses, phosphates, chromite and ilmenite, as well as sulfides and native FeNi alloy. The minerals reveal different equilibration degree. Analysis of the texture and chemical composition of Antonin allows to put the meteorite in the framework of current classification of meteorites. It also facilitates making hypotheses on the thermal and collisional processes, that the meteorite experienced while on its parent body.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Nowy chondryt zwyczajny L6, S1, W1: Northwest Africa 11779
A new ordinary chondrite L6, S1, W1: Northwest Africa 11779
Autorzy:: Przylibski, Tadeusz A.
Łuszczek, Katarzyna
Kryza, Ryszard
Tematy:: L6 chondrite
NWA chondrite
bulk chemistry
chemistry of minerals
meteorite
ordinary chondrite; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/1033133.pdf Link otwiera się w nowym oknie
Opis:: Based on petrological, mineralogical and geochemical research authors classified new meteorite Northwest Africa 11779 as the ordinary chondrite L6, S1, W1. Chemical composition of olivine crystals (Fa 24.9 mol.%) and of pyroxene crystals (Fs 19.4 mol.%) proved that this meteorite belongs to L chondrites. However, bulk chemical composition of NWA 11779 is not typical for L chondrites. Nevertheless, all analyzed elements (except Mo, Sn and Nb) are in abundances reported for L chondrites, some of elements have concentration closed to average abundances for L chondrites. The content of chosen, characteristic lithophile, siderophile and chalkophile elements in NWA 11779 chondrite is in most cases in accord with its typical abundance in L chondrites. Presence of poorly defined chondrules, secondary feldspar crystals larger than 50 µm in size, absence of glass within chondrules, coarse recrystallized matrix (with olivine crystals of 0.5 mm in diameter and pyroxene crystals of 0.3 mm in diameter) as well as carbon content below 0.2 wt% proved that studied meteorite belongs to the petrologic type 6. The only difference from characteristic features of petrologic type 6 in case of NWA 11779 chondrite is presence of ca. 10% of monoclinic Ca-poor pyroxenes. Undulatory extinction by olivine and absence of other shock features in this chondrite allow to determine the shock level as S1. Weathering grade of NWA 11779 was identified as W1 based on weathering of only FeNi alloy grains. The outer part of metallic grains as well as contact zones of FeNi and FeS are changed due to weathering. Between 10 and 20% of FeNi alloy grains are oxidized to iron oxides and hydroxides. These secondary products of weathering replace outer zone of FeNi grains and fill the small cracks, creating a few thin veins.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Sołtmany meteorite
Autorzy:: Karwowski, Ł.
Tematy:: meteorite
ordinary chondrite
L6 chondrite
meteorite fall
hammer meteorite
Warmia-Masuria Province
Sołtmany village; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/411492.pdf Link otwiera się w nowym oknie
Opis:: This paper presents the results of a mineralogical and petrological study of the Sołtmany meteorite, which fell on April 30, 2011 in northern Poland. The meteorite was found almost immediately after it fell and has been little altered by weathering. Sołtmany is not the only observed fall of an L6 chondrite over Europe in the past few years. The preceding fall of this type, Jesenice (Slovenia), was also witnessed in April of 2009. However, it was not until several weeks after the fall that the first specimen of Jesenice was found, whereas Sołtmany was collected after a few minutes and submitted for analysis within a couple of days. The author presents mineral and petrographic features and chemical characteristics of mineral phases in Sołtmany. The mineral components are represented by metallic phases (kamacite, taenite, tetrataenite, native copper), as well as chromite, olivine, low and high-calcium pyroxene, feldspar, chlorine-bearing apatite, and merrillite. This study also describes the texture of the meteorite and takes notice of a low number of preserved chondrules and the presence of oval chondrule like areas, which exhibit a metamorphosed, recrystallized texture. Sołtmany was classified as an L6 ordinary chondrite with a weathering grade of W0. A shock stage S2 was determined on the basis of undulose extinction and lack of planar fractures in olivine crystals.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: The meteorite fall near Boumdeid, Mauritania, from September 14, 2011
Autorzy:: Buhl, S.
Toueirjenne, C.
Hofmann, B.
Laubenstein, M.
Wimmer, K.
Tematy:: Boumdeid (2011)
meteorite fall
Mauritania
trajectory scenario
L6 chondrite
cosmogenic radionuclides; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/411504.pdf Link otwiera się w nowym oknie
Opis:: On the evening of September 14, 2011 at 21:00 GMT a bright bolide was observed by hundreds of eyewitnesses in the area north and west of the town of Kiffa, in the department of Assaba, in south Mauritania. A terminal fragmentation and sound phenomena were observed near the end point of the trajectory. At least one mass of 3.5 kg was observed to impact and recovered the morning after the fall near Boumdeid (or Bou Mdeid), around 60 km north of Kiffa. Subsequently a large number of eyewitness accounts were recorded and mapped by GPS. The present paper provides a scenario for the trajectory of the Boumdeid (2011) meteorite based on the available parameters and wind data at the relevant altitudes. In addition the paper presents the results of the mineralogical and chemical analysis of the recovered meteorite which is consistent with a classification as ordinary chondrite of type L6, shock stage S2, and a weathering grade of W0. Following its analysis and classification, the meteorite was published under the official name Boumdeid (2011) in Meteoritical Bulletin, no. 100, MAPS 49(8), (2014). Gamma ray spectroscopy was conducted 84 days after the fall and the detection of short-lived radionuclides such as ⁵⁶Co and ⁴⁶Sc confirmed the recency of the event. Derived from the data of ⁶⁰Co, ⁵⁴Mn and ²²Na the approximate preatmospheric radius of the meteorite body was 10–20cm. The report is also intended to serve as a case example for post-event data recovery and trajectory reconstruction in areas not covered by sky-camera networks and with limited scientific infrastructure.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Nowy Polski meteoryt z Drelowa: charakterystyka geochemiczna, mineralogiczna i petrologiczna
New Polish meteorite from Drelów: geochemical, mineralogical and petrological investigation
Autorzy:: Szopa, Krzysztof
Mirek, Agnieszka
Żmija, Mateusz
Kmieciak, Kryspin
Krzykawski, Tomasz
Tematy:: new Polish meteorite
Drelów
ordinary chondrite L6; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/60167821.pdf Link otwiera się w nowym oknie
Opis:: The meteorite fall was recorded and found by the Skytinel fireball network. The fall was observed on 18 Feb 2025, at 18:04 (UT+1). The meteoroid’s orbit, atmospheric trajectory, and strewn field were calculated, and about 60 fragments with a mass of approx. 3700 g were till the end of March 2025. The first fragment (93 g) was found four days after the fall. The fusion crust is black (composed of glassy material with Fe-rich skeletal spinel inclusions). Chondrules are rare, and they are not bigger than 1.5 mm in diameter. Typically they are up to 0.8 mm in size. Chondrules are represented by different types. The main types are: porphyritic olivine chondrules (PO), barred olivine chondrules (BO)>granular olivine pyroxene (GOP)>radial pyroxene (RP). Most of the chondrules are easily distinguished, and are deformed. In some parts of the specimens, black shock veins are visible in a hand specimens. Metal alloys are represented by kamacite, taenite and tetrataenite. The investigated meteorite also shows native copper grains (up to 5 mm in diameter). The main composition of the meteorite is (vol.%): Ol (35.5), Opx (43), Cpx (9.2), Pl (5.0), Tr (3.5), Kam (2.7), Mer+Ap (0.4) and Chr (0.3). The Fa, Fs, and Te content in olivine (mean content; mol.%) is 25.94, 73.35, and 0.55, respectively. Low-Ca pyroxenes are homogenous, where Wo is 1.65, Fs is 22.00, and En is 76.34 (mol.%). The mean content of Al2O3, MgO and TiO2 in chromium spinel is 5.6 wt.%, 2.36 wt.% and 2.73 wt.%, respectively. Homogenous troilite is with minimal sulpfur deficiency. The Ni and Co content in troilite is up to 0.04 wt.% and 0.11 wt.%, respectively. The metal phases are represented by kamacite, taenite and tetrataenite. The kamacite has a Ni content in the 5.83–6.81 wt.% range, while the Co content is 0.39 to 0.56 wt.%. The tetrataenite is characterised by a Ni content from 49.68 to 50.46 wt.% and Co up to 0.05 wt.%. High-Ca monoclinic pyroxene, similar to diopside, is rare. Pyroxene with plagioclase is located in the mezostasis. The feldspar composition is as follows (mean; N = 37): Ab (83.91%), Or (5.78%), An (10.31%) and Cs (0.03%). The feldspars grains are also between the matrix and close to metamorphosed chondrules. Feldspars are up to 200 um in length. Accessory minerals are phosphates (chlorapatite<merrillite) and native copper (Ni = 1.48 wt.%.). Based on the classical method, the meteorite is classified as ordinary chondrite L6 (based on Ol and Px composition (Fa/Fs) and the Co content in kamacite compared with Fa in olivine) with the W0 weathering grade and the S3 metamorphic type.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Meteoryt Święcany
Święcany meteorite
Autorzy:: Karwowski, Łukasz
Badur, Łukasz
Mazur, Marcin
Tematy:: meteorites
new polish chondrite L 4-5
schock stage s2
warthering stage w3
Święcany meteorite; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/1032662.pdf Link otwiera się w nowym oknie
Opis:: The new Polish meteorite Święcany represents an old fall. It was found in 2004 in the Podkarpacie region, at Święcany village, commune Skołyszyn, district Jasło. The coordinates of this find are: φ = 49°47'29"N; λ = 21°15'28"E; or „1992”, x= 216194,11, y= 662339,76. It was found by 12 year old Katarzyna Depczyńska on the village gravel road. Probable primary mass is ca. 8 g. The present mass is 6.62 g., and one polished thin section. The classification: ordinary chondrite L4-5, weathering stage w3, shock stage s2.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: A new classification of Nyirábrany, an ordinary chondrite from Hungary
Autorzy:: Mészáros, M.
Kereszturi, A.
Ditrói-Puskás, Z.
Tematy:: chondrite
classification
L and LL chondrites.; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/411486.pdf Link otwiera się w nowym oknie
Opis:: The Nyirábrany meteorite is an ordinary chondrite from Hungary that fell in 1914 and, to date, has been studied very little. The aim of this work was to carry out a more detailed examination of this meteorite (using optical polarization microscope, energy dispersive X-ray spectroscopy and Raman micro spectroscopy) and re-investigate its previous classification as an LL5 type ordinary chondrite, moreover to complete its classification with a shock stage and a weathering grade. Our new results indicate that Nyirábrany could be a transition type between the L and LL chondrites. The main mineral phases of Nyirábrany are olivine, pyroxene and opaque minerals (e.g. Fe-Ni metal, troilite, chromite), minor constituents are plagioclase, Cl-apatite, cristobalite and glass. The Fe-Ni metal content (1.32 vol%) of Nyirábrany is typical of the LL group, the Fa content of olivines (26.71 mol%) is between the range of the L and LL types, while the Fs-content of the low-Ca pyroxenes (20.51 mol%) is typical of the L-chondrites. Chondrules appear in different sizes, mineral compositions and textures. The textural and mineralogical features (e.g. mostly homogeneous silicate minerals, dominance of clinopyroxenes, recrystallized matrix, well-defined chondrules) indicate petrological type 4-5 for Nyírábrány. The shock stage and the weathering grade of this meteorite were examined for the first time. On the basis of the observed optical and textural features of the olivine grains (e. g. sharp optical extinction, irregular and planar fractures) Nyirábrany has an S2 shock stage. About 30–40% of the opaque phases are affected by oxidation, which shows a W2 weathering grade.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Chondryt Sołtmany
Sołtmany chondrite
Autorzy:: Przylibski, Tadeusz A.
Tematy:: Gefion family
L6
asteroid
atomic weight
bulk chemistry
cosmic-ray exposure age
cosmogenic radionuclides
density
fusion crust
magnetic susceptibility
meteorite
meteorite age
meteorite fall
mössbauer spectroscopy
noble gas
ordinary chondrite
organic matter
parent body
porosity
primordial radionuclides
thermophysical properties
troilite thermometer; Pokaż więcej
Wydawca:: Polskie Towarzystwo Meteorytowe
Powiązania:: https://bibliotekanauki.pl/articles/1033061.pdf Link otwiera się w nowym oknie
Opis:: The Sołtmany hammer meteorite is classified as an ordinary chondrite type L6, W0, S2. At present it is the most thoroughly and comprehensively examined Polish meteorite. A comprehensive petrological, mineralogical and geochemical analysis alongside the investigation of its physical and particularly thermophysical properties, and, most of all, analyses of cosmogenic radionuclides and noble gases isotopes content, as well as the use of a troilite thermometer has made it possible to draw interesting conclusions concerning the genesis and evolution of the parent body and the history of the parent meteoroid and, finally, the Sołtmany meteorite. The present report attempts at summing up the results of studies conducted at several European research centres in the last four years. The age of the the Sołtmany chondrite parent rock has been defined at 4.137 billion years. It was formed at a temperature of up to 440–450 K (about 170°C), probably at a depth of up to 3 to 7 km under the surface of the parent body, i.e. at a pressure of the order of 1–2.4 kbar. Such a low temperature during the accretion, diagenesis and metamorphism of the parent body may point to its complicated development, which may be in part due to collisions of partially melted planetesimals. Like with other type L ordinary chondrites, one can infer that the parent body could have been destroyed about 467 million years ago, at the time of a catastrophic collision which led to the formation of Gefion family of planetoids. Perhaps one of the bodies in this family was involved in another collision about 29.2 million years ago, which resulted in ejecting the parent meteoroid of the Sołtmany chondrite onto the Earth collision trajectory. Before entering the Earth’s atmosphere, this meteoroid had the mass of about 36 kg and the diameter of ca 13.5 cm. During its flight through the atmosphere, it rotated and somersaulted, which resulted in the formation of an uniform thin (0.5–0.7 mm) fusion crust, whose temperature reached 1000°C. In the last phase, the Sołtmany meteorite fell almost vertically and its mass was a mere 3% of the mass of the parent meteoroid – 1.066 kg. It hit the roof and then the concrete stairs of a farm building, which caused it to break into two bigger and many small pieces. It was found a few minutes after the fall, which occurred at 6:03 a.m. (CEST, UTC+2:00) on 30 April 2011, by Wydmińskie Lake in northern Poland (54°00,53’N, 22°00,30’E). The Sołtmany chondrite is one of just 14 meteorites in which the activity concentration of the cosmogenic 52Mn has been determined, and one of the few ordinary chondrites where the concentration of organic matter has been defined. As a result, it was found out that unlike in carbonaceous CI chondrites, the composition of organic particles is dominated by less complex compounds (CHO and CHOS) than CHNO and CHNOS compounds. This may indicate the decomposition of more complex organic compounds into particles with simple structures during magmatic and metamorphic processes related to formation of type L ordinary chondrites.
Dostawca treści:: Biblioteka Nauki

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