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Record Details

Record 74 of 5686
Rare earth patterns in shergottite phosphates and residues
Author and Affiliation:
Laul, J. C.(Battelle Pacific Northwest Laboratories, Richland, WA, United States)
Abstract: Leaching experiments with 1M HCl on ALHA 77005 powder show that rare earth elements (REE) are concentrated in accessory phosphate phases (whitlockite, apatite) that govern the REE patterns of bulk shergottites. The REE patterns of whitlockite are typically light REE-depleted with a negative Eu anomaly and show a hump at the heavy REE side, while the REE pattern of apatite (in Shergotty) is light REE-enriched. Parent magmas are calculated from the modal compositions of residues of ALHA 77005, Shergotty, and EETA 79001. The parent magmas lack a Eu anomaly, indicating that plagioclase was a late-stage crystallizing phase and that it probably crystallized before the phosphates. The parent magmas of ALHA 77005 and Shergotty have similar REE patterns, with a subchondritic Nd/Sm ratio. However, the Sm/Nd isotopoics require a light REE-depleted source for ALHA 77005 (if the crystallization age is less than 600 Myr) and a light REE-enriched source for Shergotty. Distant Nd and Sr isotopic signatures may suggest different source regions for shergottites.
Publication Date: Mar 30, 1987
Document ID:
19870046807
(Acquired Nov 28, 1995)
Accession Number: 87A34081
Subject Category: LUNAR AND PLANETARY EXPLORATION
Document Type: Journal Article
Publication Information: Journal of Geophysical Research (ISSN 0148-0227); 92; E633-E64
Publisher Information: United States
Contract/Grant/Task Num: NAS9-15357
Financial Sponsor: NASA; United States
Organization Source: Battelle Pacific Northwest Labs.; Richland, WA, United States
Description: 8p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: METEORITIC COMPOSITION; MINERALOGY; PHOSPHATES; RARE EARTH COMPOUNDS; LEACHING; MAGMA; NEODYMIUM ISOTOPES; RESIDUES; STRONTIUM ISOTOPES
Imprint And Other Notes: (Lunar and Planetary Institute, NASA, AAS, et al., Lunar and Planetary Science Conference, 17th, Houston, TX, Mar. 17-21, 1986) Journal of Geophysical Research (ISSN 0148-0227), vol. 92, March 30, 1987, p. E633-E640.
Availability Source: Other Sources
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