globalchange  > 影响、适应和脆弱性
DOI: 10.1016/j.epsl.2018.04.021
Scopus记录号: 2-s2.0-85046992347
论文题名:
Particle size distributions in chondritic meteorites: Evidence for pre-planetesimal histories
作者: Simon J.I.; Cuzzi J.N.; McCain K.A.; Cato M.J.; Christoffersen P.A.; Fisher K.R.; Srinivasan P.; Tait A.W.; Olson D.M.; Scargle J.D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 494
起始页码: 69
结束页码: 82
语种: 英语
英文关键词: asteroids ; CAIs ; chondritic meteorites ; chondrules ; planetesimals ; protoplanetary disks
Scopus关键词: Aggregates ; Asteroids ; Computer aided instruction ; Magnesium compounds ; Meteorites ; Particle size ; Planets ; Screening ; Silicates ; Size distribution ; Sorting ; Broad size distribution ; Carbonaceous chondrites ; Chondritic meteorites ; chondrules ; Microscopic image analysis ; Narrow size distributions ; planetesimals ; Protoplanetary disks ; Particle size analysis
英文摘要: Magnesium-rich silicate chondrules and calcium-, aluminum-rich refractory inclusions (CAIs) are fundamental components of primitive chondritic meteorites. It has been suggested that concentration of these early-formed particles by nebular sorting processes may lead to accretion of planetesimals, the planetary bodies that represent the building blocks of the terrestrial planets. In this case, the size distributions of the particles may constrain the accretion process. Here we present new particle size distribution data for Northwest Africa 5717, a primitive ordinary chondrite (ungrouped 3.05) and the well-known carbonaceous chondrite Allende (CV3). Instead of the relatively narrow size distributions obtained in previous studies (Ebel et al., 2016; Friedrich et al., 2015; Paque and Cuzzi, 1997, and references therein), we observed broad size distributions for all particle types in both meteorites. Detailed microscopic image analysis of Allende shows differences in the size distributions of chondrule subtypes, but collectively these subpopulations comprise a composite “chondrule” size distribution that is similar to the broad size distribution found for CAIs. Also, we find accretionary ‘dust’ rims on only a subset (∼15–20%) of the chondrules contained in Allende, which indicates that subpopulations of chondrules experienced distinct histories prior to planetary accretion. For the rimmed subset, we find positive correlation between rim thickness and chondrule size. The remarkable similarity between the size distributions of various subgroups of particles, both with and without fine grained rims, implies a common size sorting process. Chondrite classification schemes, astrophysical disk models that predict a narrow chondrule size population and/or a common localized formation event, and conventional particle analysis methods must all be critically reevaluated. We support the idea that distinct “lithologies” in NWA 5717 are nebular aggregates of chondrules. If ≥cm-sized aggregates of chondrules can form it will have implications for planet formation and suggests the sticking stage is where the preferential size physics is operating. © 2018
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109849
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Center for Isotope Cosmochemistry and Geochronology, ARES, EISD-XI3, NASA Johnson Space Center, Houston, TX 77058, United States; NASA Ames Research Center, Moffett Field, CA 94035, United States; The University of Chicago, Chicago, IL 60637, United States; Western Carolina University, Cullowhee, NC 28723, United States; St. Lawrence University, Canton, NY 13617, United States; University of Cincinnati, Cincinnati, OH 45219, United States; Rutgers University, Piscataway, NJ 08854, United States; Monash University, Clayton, VIC 3168, Australia; BAERI, inc., Petaluma, CA 94952, United States; Former summer interns at JSC through Lunar and Planetary Institute or NASA Co-op Programs, United States; University of California, Los Angeles, Department of Earth, Planetary, and Space Sciences, Los Angeles, CA 90095, United States; University of New Mexico, Department of Earth and Planetary Sciences, Albuquerque, NM 87131, United States; Centre for Planetary Science and Exploration, Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 3K7, Canada; ARES, NASA Johnson Space Center, Houston, TX 77058, United States; University of Stirling, Department of Biological and Environmental Sciences, Stirling, FK9 4LA, United Kingdom

Recommended Citation:
Simon J.I.,Cuzzi J.N.,McCain K.A.,et al. Particle size distributions in chondritic meteorites: Evidence for pre-planetesimal histories[J]. Earth and Planetary Science Letters,2018-01-01,494
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