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Shock-induced volatile loss from a carbonaceous chondrite: implications for planetary accretion

Tyburczy, James A. and Frisch, Benjamin and Ahrens, Thomas J. (1986) Shock-induced volatile loss from a carbonaceous chondrite: implications for planetary accretion. Earth and Planetary Science Letters, 80 (3-4). pp. 201-207. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20141029-091822400

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Abstract

Solid-recovery impact-induced volatile loss experiments on the Murchison C2M meteorite indicate that for an impact of a given velocity, H_2O and total volatiles are driven from the sample in the same proportion as present initially. We infer that the volatiles other than H_2O driven from the meteorite also have the same bulk composition as those of the starting material. Thus, the early bulk composition of an impact-induced atmosphere of a planet growing by accretion from material like Murchison would be the same as the volatile composition of the incident planetesimals. Incipient devolatilization of Murchison occurs at an initial shock pressure of about 11 GPa and complete devolatilization occurs at a pressure of about 30 GPa. If an Earth-sized planet were formed from the infall of planetesimals of Murchison composition, incipient and complete devolatilization of accreting planetesimals would occur when the planet reached approximately 12% and 27%, respectively, of its final radius. Thus, impact-induced devolatilization of accreting planetesimals and of the hydrated surface would profoundly affect the distribution of volatiles within the accreting planet. For example, for a cold, homogeneous accretion of a planet, prior to metallic core formation and internal differentiation, the growing planet would have a very small core with the same volatile content as the incident material, a volatile-depleted “mantle”, and an extremely volatile-rich surface.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0012-821X(86)90104-4DOIArticle
http://www.sciencedirect.com/science/article/pii/0012821X86901044PublisherArticle
Additional Information:© 1986 Elsevier Science Publishers B. V. Received February 5, 1986, revised version received July 30, 1986. Supported under NASA grant NGL-05-002-105. We are grateful to Professor Carleton Moore and the Center for Meteorite Studies, Arizona State University for samples. We appreciate the use of laboratory facilities operated by George Rossman and E.M. Stolper as well as helpful comments on the manuscript proffered by William Anderson. Fred Horz and two anonymous reviewers provided constructive reviews Division of Geological and Planetary Sciences Contribution No. 4293.
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NASANGL-05-002-105
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Caltech Division of Geological and Planetary Sciences4293
Record Number:CaltechAUTHORS:20141029-091822400
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20141029-091822400
Official Citation:James A. Tyburczy, Benjamin Frisch, Thomas J. Ahrens, Shock-induced volatile loss from a carbonaceous chondrite: implications for planetary accretion, Earth and Planetary Science Letters, Volume 80, Issues 3–4, November 1986, Pages 201-207, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(86)90104-4. (http://www.sciencedirect.com/science/article/pii/0012821X86901044)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50986
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Oct 2014 16:26
Last Modified:29 Oct 2014 16:26

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