PRODUCTS

  • Rare Earth Abundances in Meteoritic Chondrules

    The overall RE decrease in Forest City and Richardton chondrules seems consistent with diffusion of REE out of the chondrules. The nearly identical abundances of Eu in the chondrules and whole-rock chondrites of Forest City and Richardton strongly suggest that the preponderance of Eu exists or existed in the divalent oxidation state in chondrules and the chondritic matrix during metamorphism.

    (PDF) Rare-Earth Element Abundances in Chondrules

    Rare earth elements (REE) are important trace elements for evaluating geological processes and are strategic metals with applications in high technology.

    Rare Earth Abundance s in Meteoritic Chondrules 7 R. A

    2020-3-12 · The 14 rare earth elements (REE) and Y were determined by radiochemical neutron activation analysis (RNAA) in 30 combined magnetic chondrules (0.079 g) from Mokoia (Type I11 carbonaceous I 9 chondrite), in 30 combined chondrules (0.080 g) from Chainpur (Un- equilibrated LLgroup chondrite), in 35 combined chondrules (0.081 9)

    Rare-earth elements in matrix, inclusions, and

    1973-8-1 · ICARUS 19, 523-530 (1973) Rare-Earth Elements in Matrix, Inclusions, and Chondrules of the Allende Meteorite TSUYOSHI TANAKA Geological Survey of Japan, Hisamoto, Takatsu-ku, Kawasaki, Japan AND AKIMASA MASUDA Department of Chemistry, Science University of Tokyo, Kagurazaka, Shinjuku-ku, Tokyo, Japan Received February 21, 1973; revised March 26, 1973 rth elements in a

    Distribution of Na, K, and rare-earth elements in

    1989-9-1 · The contents and the composition of REE in individual chondrules were found to vary considerably. On the basis of correlations between the known behavioral characteristics of Na, K, and REE during the processes of condensation, melting, magmatic differentiation, and metamorphism, and the contents of REE and oxygen isotopes in various chondrules, eight genetic chondrule types were

    Rare Earth Element Fractionation in Chondrules

    2004-3-1 · We report REE data from OC and CC chondrules. The fractionation indicates the presence of reduced components in the precursor material.

    RARE EARTH ELEMENTS AND OXYGEN ISOTOPES IN

    2003-2-3 · Rare Earth Elements. The majority of the Allende chondrules have flat chondritic normalized REE pat-terns, with Eu variations following mineralogical con-trols. Figure 1 shows the pattern for the mean of six analyses of the mesostasis of A7, a coarse grained barred olivine chondrule. The abundances for most chondrules vary around

    Rare Earth Abundances in Meteoritic Chondrules CORE

    Rare earth elements abundance in meteoritic chondrites determined by radiochemical neutron activation analysi

    RARE EARTH ELEMENTS IN BULK CHONDRITES AND

    2017-7-27 · RARE EARTH ELEMENTS IN BULK CHONDRITES AND CHONDRITE COMPONENTS V. Bendel1*, A. Patzer2, A. Pack1, D. C. Hezel3 and C. Münker4, 1Georg-August-Universität Göttingen, Geoscience Center, Department of Isotope Geology, Goldschmidtstrasse 1, D-37077 Göttingen, Germany (*[email protected]ni-

    RARE EARTH ELEMENTS IN CV CARBONACEOUS

    2018-1-9 · Generally, chondrule mesostasis is enriched ~10x CI with a flat pattern, while chondrule minerals (olivine and pyroxene) have a sub-CI to CI abundance of REE. Some variation in the REE abundance patterns is observed in these chondrule components but the average pattern is flat favoring neither the light-REE nor the heavy-REE.

    Rare Earth Abundance s in Meteoritic Chondrules 7 R. A

    2020-3-12 · The 14 rare earth elements (REE) and Y were determined by radiochemical neutron activation analysis (RNAA) in 30 combined magnetic chondrules (0.079 g) from Mokoia (Type I11 carbonaceous I 9 chondrite), in 30 combined chondrules (0.080 g) from Chainpur (Un- equilibrated LLgroup chondrite), in 35 combined chondrules (0.081 9)

    Chondrules with peculiar REE patterns: implications

    2004-2-13 · Rare earth element (REE) data from two ordinary chondrite chondrules show distinct negative chondrite-normalized concentration anomalies of samarium, europium, and ytterbium. The peculiar patterns may be the result of REE gas/solid fractionation at an oxygen fugacity lower than has been assumed for the canonical solar nebula.

    Rare Earth Abundances in Meteoritic Chondrules CORE

    Rare Earth Abundances in Meteoritic Chondrules . By R. H. Smith, D. A. Olehy and R. A. Schmitt. Get PDF (899 KB) Abstract. Rare earth elements abundance in meteoritic chondrites determined by radiochemical neutron activation analysi Topics: GEOPHYSICS

    Volatile element evolution of chondrules through

    2018-8-21 · Here we have determined the bulk chemical composition—rare earth, refractory, main group, and volatile element contents—of a suite of chondrules previously dated using the Pb−Pb system. The volatile element contents of chondrules increase with time from ∼1 My after Solar System formation, likely the result of mixing with a volatile

    Volatile element evolution of chondrules through time

    chondrules, including their volatile element history and the prevailing conditions of their formation, has implications not only for the understanding of chondrule formation and evolution but for that of larger bodies such as the terrestrial planets. Here we have determined the bulk chemical composition—rare earth

    Volatile element evolution of chondrules through time

    2020-6-1 · Here we have determined the bulk chemical composition—rare earth, refractory, main group, and volatile element contents—of a suite of chondrules previously dated using the Pb−Pb system. The volatile element contents of chondrules increase with time from ∼1 My after Solar System formation, likely the result of mixing with a volatile

    The formation conditions of enstatite chondrites:

    Rare earth element (REE) and other lithophile element patterns are shown in Figs. 2-4 (with comparison to LL chondrites; cf. Jacquet et al. 2015). We now describe the chemical composition of the chondrules, starting with type I chondrules (excepting two with anomalous results, discussed afterward), with particular emphasis on REE.

    [1812.03702] Chondrule heritage and thermal

    2018-12-10 · Abstract: We report combined oxygen isotope and mineral-scale trace element analyses of amoeboid olivine aggregates (AOA) and chondrules in ungrouped carbonaceous chondrite Northwest Africa 5958. The trace element geochemistry of olivine in AOA, for the first time measured by LA-ICP-MS, is consistent with a condensation origin although the shallow slope of its rare earth element (REE)

    Chondrites: The Most Abundant Earths Rare

    Chondrites are the most common type of meteorite, but they are still rare. Chondrites take their name from the chondrules they contain small grain-like spheres of varying sizes and colors. Chondrules are never found in terrestrial rocks and are believed to have formed within the solar nebula disk, billions of years ago, and therefore predate

    Determination of picogram quantities of rare-earth

    2019-5-25 · Determination of rare earth elements in USGS rock standards by isotope dilution mass spectrometry and comparison with neutron activation and inductively coupled plasma atomic emission spectrometry. Analytica Chimica Acta 1990,236,487-493.

    Chondrules with peculiar REE patterns: implications

    2004-2-13 · Rare earth element (REE) data from two ordinary chondrite chondrules show distinct negative chondrite-normalized concentration anomalies of samarium, europium, and ytterbium. The peculiar patterns may be the result of REE gas/solid fractionation at an oxygen fugacity lower than has been assumed for the canonical solar nebula.

    Volatile element evolution of chondrules through time

    chondrules, including their volatile element history and the prevailing conditions of their formation, has implications not only for the understanding of chondrule formation and evolution but for that of larger bodies such as the terrestrial planets. Here we have determined the bulk chemical composition—rare earth

    Volatile element evolution of chondrules through time

    2020-6-1 · Here we have determined the bulk chemical composition—rare earth, refractory, main group, and volatile element contents—of a suite of chondrules previously dated using the Pb−Pb system. The volatile element contents of chondrules increase with time from ∼1 My after Solar System formation, likely the result of mixing with a volatile

    Rarity of Chondrules and CAI iopscience.iop.org

    Among the meteorites falling to Earth, the CAI are rare, being only 15% by volume of a class that constitutes 0.84% of observed falls, however chondrules are ubiquitous. Here it is pointed out 96% of the meteorites entering the atmosphere contain few or no chondrules because atmospheric passage destroys such meteorites 1000 times more

    [1812.03702] Chondrule heritage and thermal

    2018-12-10 · Abstract: We report combined oxygen isotope and mineral-scale trace element analyses of amoeboid olivine aggregates (AOA) and chondrules in ungrouped carbonaceous chondrite Northwest Africa 5958. The trace element geochemistry of olivine in AOA, for the first time measured by LA-ICP-MS, is consistent with a condensation origin although the shallow slope of its rare earth element (REE)

    EarthRef.org Reference Database (ERR) -- Alexander

    Keywords unequilibrated ordinary chondrites, type-3 ordinary chondrites, barred-olivine chondrules, rare-earth elements, al-rich chondrules, dynamic crystallization, semarkona chondrules, ion

    Earth And Planetary Sciences

    2020-6-14 · Online Materials for Populations of Calcium-and Aluminum Inclusions and Rare Earth Elements in Ornans-group Carbonaceous Chondrites as Associated with the PhD Dissertation of Ellen J. Crapster-Pregont (Constraining the Chemical Environment and Processes in the Protoplanetary Disk: Perspective from Populations of Calcium-and Aluminum-rich

    EarthRef.org Reference Database (ERR) -- Boynton 1984

    EarthRef.org is the web site for Earth Reference Data and Models EarthRef.org Reference Database (ERR) Development and Maintenance by the EarthRef.org Database Team

    The tell-tale clue to how meteorites were made, at the

    2019-6-7 · This meteor crater in Arizona was created 50,000 years ago when an iron meteorite struck the Earth. It is about one mile across. W. Herbst, CC BY-SA The mysterious chondrules

    Minerals in Meteorites CERN

    2014-7-18 · Albite is the sodium end member of the plagioclase solid solution series. It is very rare in mete-orites. Minor amounts in SNC meteorites. Anorthite CaAl 2 Si 2 O 8 Anorthite is the calcium end member of the plagioclase solid solution series. It is a common accessory mineral in chondrites and achondrites. It is a major mineral in eucrites and

    Volatile element evolution of chondrules through time

    chondrules, including their volatile element history and the prevailing conditions of their formation, has implications not only for the understanding of chondrule formation and evolution but for that of larger bodies such as the terrestrial planets. Here we have determined the bulk chemical composition—rare earth

    Volatile element evolution of chondrules through time

    2018-8-6 · Here we have determined the bulk chemical composition-rare earth, refractory, main group, and volatile element contents-of a suite of chondrules previously dated using the Pb-Pb system. The volatile element contents of chondrules increase with time from ∼1 My after Solar System formation, likely the result of mixing with a volatile-enriched

    Volatile element evolution of chondrules through time

    2020-6-1 · Here we have determined the bulk chemical composition—rare earth, refractory, main group, and volatile element contents—of a suite of chondrules previously dated using the Pb−Pb system. The volatile element contents of chondrules increase with time from ∼1 My after Solar System formation, likely the result of mixing with a volatile

    CHONDRULES, Annual Review of Earth and Planetary

    1997-5-1 · Abstract Chondrules are ∼1-mm igneous droplets in primitive meteorites, and their abundance suggests widespread melting in the protoplanetary disk. Chondrules with relict unmelted grains or igneous rims record multi111ple melting events. There are two main types of chondrules, type I (FeO-poor and volatile-poor) and type II FeO-rich and approximately chondritic (solar) in composition. Type I

    Chondrules as direct thermochemical sensors of solar

    2018-7-1 · Chondrules, millimeter-sized igneous spherules comprising the major component of most chondritic meteorites, formed during the first 4 million to 5 million years of the evolution of the solar protoplanetary disk and, therefore, can potentially offer important constraints on the conditions in the disk, provided that the processes that led to their formation can be understood.

    Trace element geochemistry of ordinary chondrite

    We report trace element concentrations of silicate phases in chondrules from LL3 ordinary chondrites Bishunpur and Semarkona. Results are similar to previously reported data for carbonaceous chondrites, with rare earth element (REE) concentrations increasing in the sequence olivine. <. pyroxene. <. mesostasis, and heavy REE (HREE) being enriched by 1-2 orders of magnitude (CI-normalized

    EarthRef.org Reference Database (ERR) -- Alexander

    Keywords unequilibrated ordinary chondrites, type-3 ordinary chondrites, barred-olivine chondrules, rare-earth elements, al-rich chondrules, dynamic crystallization, semarkona chondrules, ion

    Al-Mg systematics of CAIs, POI, and ferromagnesian

    Al-Mg systematics of CAIs, POI, and ferromagnesian chondrules from Ningqiang We have made aluminum-magnesium isotopic measurements on 4 melilite-bearing calcium-aluminum-rich inclusions (CAIs), 1 plagioclase-olivine inclusion (POI), and 2 ferromagnesian chondrules from the Ningqiang carbonaceous chondrite.

    The rare‐Earth distribution in sediments Haskin

    Larry Haskin, Mary A. Gehl, The rare‐Earth contents of standard rocks G‐1 and W‐1 and their comparison with other rare‐Earth distribution patterns, Journal of Geophysical Research, 10.1029/JZ068i007p02037, 68, 7, (2037-2043), (2012).

    Trace Element Conundrum of Natural Quasicrystals

    2021-2-25 · This is particularly important for interpreting the light rare-earth elements in natural icosahedrite. As an example, Figure S4 shows time-resolved signals for Al, La, and Ce of sample NI2_02. The Al signal ( Figure S4a ) is reported to highlight the behavior of the internal standard, and it can be used as a proxy for well-resolved elements.