Ordinary chondrites: Multivariate statistical analysis of trace element contents

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(91)90396-M· OSTI ID:5836105

Lipschutz, M E; Samuels, S M ^[1]

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1. Purdue Univ., West Lafayette, IN (USA)

The authors used standard multivariate Discriminant Functions, borrowed from Linear Discriminant Analysis and Logistic Regression, to compare contents of mobile trace elements (Co, Au, Sb, Ga, Se, Rb, Cs, Te, Bi, Ag, In, Tl, Zn, Cd) in various populations of L4-6 or H4-6 chondrites. To aid in their analysis they developed a non-standard Randomization-Simulation method that permits probability assignments on a distribution-free basis. Because the sample database for Antarctic L4-6 chondrites is very limited, they could not establish that mildly and strongly shocked (<22 GPa and {ge}22 GPa, respectively) populations differ compositionally. For non-Antarctic L4-6 chondrites, where the sample data-base is larger and the degree of shock-loading in the strongly shocked population is greater on average, a highly significant compositional difference is evident. This difference probably reflects shock-induced loss of mobile trace elements from parent material of the strongly shocked population. The authors believe that the case for compositional difference between Antarctic and non-Antarctic H4-6 chondrite populations, as well as between these populations of L4-6 chondrites, in now conclusively established. Various lines of evidence demonstrate that for various sorts of meteorites, especially H4-6 chondrites, the Antarctic/non-Antarctic compositional difference is not due to trivial (terrestrial) causes but rather to preterrestrial differences in the genesis of their parent materials.

• OSTI ID: 5836105
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 55:1; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ANTARCTIC REGIONS
ANTARCTICA
CHEMICAL COMPOSITION
CHONDRITES
COMPARATIVE EVALUATIONS
DATA
GEOLOGIC HISTORY
IMPACT SHOCK
INFORMATION
MATHEMATICAL MODELS
METEORITES
NUMERICAL DATA
PETROGENESIS
POLAR REGIONS
PROBABILISTIC ESTIMATION
STATISTICAL DATA
STATISTICAL MODELS
STONE METEORITES