The Fall, Recovery, Orbit, and Composition of the Tagish Lake Meteorite: A New Type of Carbonaceous Chondrite-Reference-Cited by-同舟云学术

The Fall, Recovery, Orbit, and Composition of the Tagish Lake Meteorite: A New Type of Carbonaceous Chondrite

Published:2000-10-13 Issue:5490 Volume:290 Page:320-325
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Brown Peter G.¹,Hildebrand Alan R.²,Zolensky Michael E.³,Grady Monica⁴,Clayton Robert N.⁵,Mayeda Toshiko K.⁵,Tagliaferri Edward⁶,Spalding Richard⁷,MacRae Neil D.⁸,Hoffman Eric L.⁹,Mittlefehldt David W.¹⁰,Wacker John F.¹¹,Bird J. Andrew²,Campbell Margaret D.¹,Carpenter Robert⁸,Gingerich Heather⁸,Glatiotis Michael²,Greiner Erika⁸,Mazur Michael J.²,McCausland Phil JA.⁸,Plotkin Howard¹²,Mazur Tina Rubak²

Affiliation:

1. Department of Physics and Astronomy,

2. Department of Geology and Geophysics, University of Calgary, Calgary, Alberta T2N 1N4, Canada.

3. SN2, NASA Johnson Space Center, Houston, TX 77058, USA.

4. Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK.

5. Enrico Fermi Institute, Department of Chemistry, and Department of Geophysical Sciences, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA.

6. ET Space Systems, 5990 Worth Way, Camarillo, CA 93012, USA.

7. Sandia National Laboratories, Organization 5909, Mail Stop 0978, Post Office Box 5800, Albuquerque, NM 87185, USA.

8. Department of Earth Sciences, University of Western Ontario, London, Ontario N6A 5B7, Canada.

9. Activation Laboratories Ltd., 1336 Sandhill Drive, Ancaster, Ontario L9G 4V5, Canada.

10. Lockheed Martin SO, Houston, TX 77058, USA.

11. Pacific Northwest National Laboratory, Post Office Box 999, Richland, WA 99352, USA.

12. Department of Philosophy, University of Western Ontario, London, Ontario N6A 3K7, Canada.

Abstract

The preatmospheric mass of the Tagish Lake meteoroid was about 200,000 kilograms. Its calculated orbit indicates affinity to the Apollo asteroids with a semimajor axis in the middle of the asteroid belt, consistent with a linkage to low-albedo C, D, and P type asteroids. The mineralogy, oxygen isotope, and bulk chemical composition of recovered samples of the Tagish Lake meteorite are intermediate between CM and CI meteorites. These data suggest that the Tagish Lake meteorite may be one of the most primitive solar system materials yet studied.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference40 articles.

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5. Asteroids are classified according to the shape of their reflectance spectra and albedo. The C asteroids have spectra similar to the more primitive carbonaceous chondrites and (from the shape of their spectra) are believed to be rich in carbon clays and organics. The D and P asteroids show spectral signatures suggestive of low-temperature compounds such as complex organics water and volatiles. D and P asteroids tend to be darker than C asteroids are most numerous in the outer part of the asteroid belt and have no known meteorite analogs.

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