Calcium–aluminum-rich inclusions (CAIs) from chondritic meteorites are the oldest objects formed in the Solar System as indied by their absolute radiometric ages using the U–Pb chronometer (e.g. Amelin et al., 2010; Bouvier and Wadhwa, 2010; Connelly et
2008/12/19· Examples of calcium-aluminum-rich inclusions (CAIs) surrounded by thick chondrule mantles have been found in chondritic meteorites and cast doubt on the conventional belief that CAIs and chondrules possessed different spacetime origins in the primitive solar
2009/8/14· Virtually all chondritic meteorites have depletions in 142 Nd of between ~20 and 40 ppm relative to Earth. There is also a systematic 142 Nd depletion of ~10–15 ppm between carbonaceous and enstatite chondrites and the ordinary chondrites, which has been interpreted by Andreasen & Sharma ( 2007 ) and Carlson et al. ( 2007 ) to reflect distinct nucleosynthetic components and not radioactive
2013/10/22· MacPherson GJ (2003) Calcium-aluminum-rich inclusions in chondritic meteorites. Meteorites, Comet and Planets, Treatise on Geochemistry, ed Davis AM, ser ed Holland HD, Turekian KK (Elsevier–Pergamon, Oxford), Vol 1, pp 201–246.
Our evaluation of three models of the origin of spinel‐rich chondrules and inclusions includes new calculations of the major element refractory mineral condensation sequence from
Calcium–aluminum-rich inclusions (CAIs) from the metal-rich (CH/CB-like) carbonaceous chondrite Isheyevo are mineralogically pristine and show no evidence for postcrystallization alteration. Many of them are composed of very refractory minerals, such as 12O
Bosumtwi Ghana Impact crater Calcium-aluminum-rich inclusions (CAIs) Chicxulub Geochemistry Impact Impact cratering Impact craters Impact ejecta Kuiper Belt Mars Martian meteorites Meteorites Moon NASA Stardust mission Noble gases Olivine
Calcium-aluminum-rich inclusions (CAIs) in chondritic meteorites preserve a petrologic and isotopic record of the formation and later complex processing of the first solids in the solar nebula (MacPherson et al. 1988; MacPherson 2003; Scott and Krot 2005). Most
1.2 Chondritic Components 1.2.1 Calcium-Aluminum-Rich Inclusions Calcium-aluminum-rich inclusions are sub-millimeter to centimeter-sized clasts in chondrites that are found in nearly all types of chondrites, except for Ivuna-type chondrites (CI). They
Calcium-aluminum–rich inclusions (CAIs) and amoeboid olivine aggregates (AOAs), a refractory component of chondritic meteorites, formed in a high-temperature region of the protoplanetary disk characterized by approximately solar chemical and oxygen 17
inclusions (CAIs) in chondritic meteorites are <100 µm to >2 cm-sized objects consisting mostly of oxides and silies of calcium, aluminum, titanium, and magne-sium [1–4]. The dominant primary minerals are spinel (MgAl2O4), Al-Ti 3+-rich calcic pyroxene 2
2020/7/24· We selected the IIE iron meteorites Colomera and Techado, which contain achondritic and chondritic silie inclusions, respectively (). Their metal matrices contain cloudy zones (CZs), nanoscale intergrowths of ferromagnetic Ni-rich islands eedded in a paramagnetic Ni-poor matrix ( 22 ) that form at kamacite-taenite (K-T) interfaces (fig. S1) during cooling at ≲10 4 °C Ma −1 through
Melilite is a constituent of some calcium- and aluminum-rich inclusions (CAIs) in chondritic meteorites. These minerals crystallize from calcium-rich, alkaline magmas and from many artificial melts and blast-furnace slags. Isotope ratios of magnesium and some
The goal of this project is to begin a detailed study of the hydrogen content and isotopic compositions of H and O in calcium-aluminum rich inclusions (CAIs) and chondrules from primitive chondritic meteorites. CAIs are the oldest objects in chondritic meteorites
PresoIar Grains as Tracers of Nebular and Parent-Body Processing of Chondritic Material Russell S.S.* MacPherson G.J. [15 minutes] Alteration of Calcium-Aluminum-rich Inclusions: Times and Places Wark D.A.* [10 minutes] Conditions for Forming Calcium
Refractory materials, such as calcium-aluminum-rich inclusions (CAIs) and crystalline silies, are widely found in chondritic meteorites as well as comets, taken as evidence for large-scale
Un''Inclusione ricca di calcio e alluminio, anche detta calcium-aluminium-rich inclusion o abbreviata in Ca-Al-rich Inclusion o CAI, è un''inclusione refrattaria ricca di calcio e alluminio che si trova in alcune meteoriti primitive. Si tratta di inclusioni chiare le cui dimensioni vanno da meno di un millimetro fino a circa un centimetro
calcium-aluminum–rich inclusions (CAIs) in primitive meteorites (~5 × 10−5) is frequently assumed to reflect the (26Al/27Al) 0 of the entire protoplanetary disc, and predicts its initial 26Mg/24Mg to be ~35 parts per million (ppm) less radiogenic than modern Earth
Two new carbonaceous chondrites, GRV 023155 and GRV 050179, collected from the Grove Mountains (GRV), Antarctica, have been classified as the oxidized CV3 and CM2 chondrites, respectively. A total of 9 Ca-, Al-rich inclusions (CAIs) were found in the two meteorites. Most of the inclusions are extensively altered, with phyllosilies commonly found in the alteration asselages of CAIs
Chondrules, silie spheres typically 0.1 to 1 mm in diameter, are the most abundant constituents in the most common meteorites falling on Earth, the ordinary chondrites. In addition, many primitive meteorites have calcium-aluminum-rich inclusions (CAIs).
inclusions Chondritic meteorites, undifferentiated samples from early Solar System planetesimals, However, 53 Mn– 53 Cr ages range from before the formation of calcium–aluminum-rich inclusions (CAIs), nominally the oldest objects in the Solar System, to10
Chondrules and calcium-aluminum-rich inclusions (CAIs) experienced short melting events uncharacteristic of the asteroid belt where meteorites originate. The inner edge of the solar nebula has the shortest orbital timescale available to the system, a few days.
G.J. MacPherson, Calcium–Aluminum-Rich Inclusions in Chondritic Meteorites, Treatise on Geochemistry, 10.1016/B0-08-043751-6/01065-3, (1-47), (2007). Crossref Takayuki Ushikubo, Hajime Hiyagon, Naoji Sugiura, A FUN-like hibonite inclusion with a large 26Mg-excess, Earth and Planetary Science Letters, 10.1016/j.epsl.2006.11.031, 254 , 1-2, (115-126), (2007).
calcium-aluminum-rich inclusions (CAI) in primitive chondritic meteorites range in size from tens of mi-crometers to centimeters, and represent the earliest solids …
Author''s personal copy Calcium isotopic ratios and rare earth element abundances in refractory inclusions from the Allende CV3 chondrite Shichun Huang , Juraj Farkas 1,2, Gang Yu, Michail I. Petaev3, Stein B. Jacobsen Department of Earth and Planetary
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