IIE irons: Origin, relationship to ordinary chondrites, and evidence for siderophile‐element fractionations caused by chondrule formation

2021 ◽  
Author(s):  
Alan E. Rubin ◽  
Edward Scott
Keyword(s):  
Ordinary Chondrites ◽  
Chondrule Formation

scholarly journals Tungsten isotopic constraints on the age and origin of chondrules

2016 ◽  
Vol 113 (11) ◽  
pp. 2886-2891 ◽  
Author(s):  
Gerrit Budde ◽  
Thorsten Kleine ◽  
Thomas S. Kruijer ◽  
Christoph Burkhardt ◽  
Knut Metzler
Keyword(s):  
Planet Formation ◽  
Solar Nebula ◽  
Carbonaceous Chondrite ◽  
Critical Role ◽  
Parent Body ◽  
Uneven Distribution ◽  
Time Interval ◽  
Ordinary Chondrites ◽  
Chondrule Formation ◽  
Isotopic Constraints

Chondrules may have played a critical role in the earliest stages of planet formation by mediating the accumulation of dust into planetesimals. However, the origin of chondrules and their significance for planetesimal accretion remain enigmatic. Here, we show that chondrules and matrix in the carbonaceous chondrite Allende have complementary 183W anomalies resulting from the uneven distribution of presolar, stellar-derived dust. These data refute an origin of chondrules in protoplanetary collisions and, instead, indicate that chondrules and matrix formed together from a common reservoir of solar nebula dust. Because bulk Allende exhibits no 183W anomaly, chondrules and matrix must have accreted rapidly to their parent body, implying that the majority of chondrules from a given chondrite group formed in a narrow time interval. Based on Hf-W chronometry on Allende chondrules and matrix, this event occurred ∼2 million years after formation of the first solids, about coeval to chondrule formation in ordinary chondrites.

Troilite in the chondrules of type-3 ordinary chondrites: implications for chondrule formation

1999 ◽  
Vol 63 (15) ◽  
pp. 2281-2298 ◽  
Author(s):  
Alan E Rubin ◽  
Alan L Sailer ◽  
John T Wasson
Keyword(s):  
Ordinary Chondrites ◽  
Chondrule Formation ◽  
Type 3

scholarly journals Conditions of chondrule formation in ordinary chondrites

2021 ◽  
Author(s):  
Maxime Piralla ◽  
Johan Villeneuve ◽  
Valentina Batanova ◽  
Emmanuel Jacquet ◽  
Yves Marrocchi
Keyword(s):  
Ordinary Chondrites ◽  
Chondrule Formation

26Al records in chondrules from unequilibrated ordinary chondrites: II. Duration of chondrule formation and parent body thermal metamorphism

2008 ◽  
Vol 274 (1-2) ◽  
pp. 93-102 ◽  
Author(s):  
N.G. Rudraswami ◽  
J.N. Goswami ◽  
B. Chattopadhyay ◽  
S.K. Sengupta ◽  
A.P. Thapliyal
Keyword(s):  
Parent Body ◽  
Ordinary Chondrites ◽  
Thermal Metamorphism ◽  
Chondrule Formation

Microchondrules in ordinary chondrites: Implications for chondrule formation

1997 ◽  
Vol 61 (2) ◽  
pp. 463-473 ◽  
Author(s):  
Alexander N. Krot ◽  
Alan E. Rubin ◽  
Klaus Keil ◽  
John T. Wasso
Keyword(s):  
Ordinary Chondrites ◽  
Chondrule Formation

scholarly journals Short time interval for condensation of high-temperature silicates in the solar accretion disk

2015 ◽  
Vol 112 (5) ◽  
pp. 1298-1303 ◽  
Author(s):  
Tu-Han Luu ◽  
Edward D. Young ◽  
Matthieu Gounelle ◽  
Marc Chaussidon
Keyword(s):  
Solar System ◽  
High Precision ◽  
Formation Mechanisms ◽  
Time Interval ◽  
Condensation Temperature ◽  
Short Time Interval ◽  
Ordinary Chondrites ◽  
Condensation Zone ◽  
Chondrule Formation ◽  
Short Time

Chondritic meteorites are made of primitive components that record the first steps of formation of solids in our Solar System. Chondrules are the major component of chondrites, yet little is known about their formation mechanisms and history within the solar protoplanetary disk (SPD). We use the reconstructed concentrations of short-lived 26Al in chondrules to constrain the timing of formation of their precursors in the SPD. High-precision bulk magnesium isotopic measurements of 14 chondrules from the Allende chondrite define a 26Al isochron with 26Al/27Al = 1.2(±0.2) × 10−5 for this subset of Allende chondrules. This can be considered to be the minimum bulk chondrule 26Al isochron because all chondrules analyzed so far with high precision (∼50 chondrules from CV and ordinary chondrites) have an inferred minimum bulk initial (26Al/27Al) ≥ 1.2 × 10−5. In addition, mineral 26Al isochrons determined on the same chondrules show that their formation (i.e., fusion of their precursors by energetic events) took place from 0 Myr to ∼2 Myr after the formation of their precursors, thus showing in some cases a clear decoupling in time between the two events. The finding of a minimum bulk chondrule 26Al isochron is used to constrain the astrophysical settings for chondrule formation. Either the temperature of the condensation zone dropped below the condensation temperature of chondrule precursors at ∼1.5 My after the start of the Solar System or the transport of precursors from the condensation zone to potential storage sites stopped after 1.5 My, possibly due to a drop in the disk accretion rate.

Low temperature chondrule formation by track studies of ordinary chondrites

1988 ◽  
Vol 70 (1-2) ◽  
pp. 31
Author(s):  
L.L. Kashkarov ◽  
N.N. Korotkova ◽  
A.Ya. Skripnik ◽  
G.V. Kalinina ◽  
A.K. Lavrukhina ◽  
...  
Keyword(s):  
Low Temperature ◽  
Ordinary Chondrites ◽  
Chondrule Formation
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