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Title: Chemical studies of H chondrites: III. Regolith evolution of the Fayetteville chondrite parent

Abstract

Data for Ag, Au, Bi, Cd, Co, Cs, Ga, In, Rb, Sb, Se, Te, Tl, and Zn in consortium samples of solar-gas- and track-rich dark matrix, and dark and light clasts in the Fayetteville H chondrite regolith breccia were determined by radiochemical neutron activation analysis. The matrix proved chemically homogeneous at a level never before observed in an ordinary chondrite. Most dark clasts had similar mean trace element concentrations as matrix but were compositionally much more heterogeneous. Two clasts were unusual, one having apparently formed from impact-melted soil, the other representing a mixture of 90% matrix-10% C2M chondrite. The single light clast proved compositionally similar to H4-6 chondrite falls except for its higher contents of labile Bi, Cd, In, and Tl. Relative to matrix, all other samples seemed Cs-deficient. Other H chondrite regolith breccias studied in the past had shown peculiar Ca and/or Rb contents so that these alkalis seem diagnostic of such breccias. Dark portions of such breccias apparently represent compacted regolith soil produced by isochemical comminution of normal dark and light clasts. The dark clasts, in turn, likely represent primordial nebular condensate, although it is possible that they represent planetary cold traps that garnered labile elements generated elsewheremore » in the parent body.« less

Authors:
;  [1]
  1. Purdue Univ., West Lafayette, IN (United States)
Publication Date:
OSTI Identifier:
5142514
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta; (United States)
Additional Journal Information:
Journal Volume: 55:11; Journal ID: ISSN 0016-7037
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; CHONDRITES; CHEMICAL COMPOSITION; PETROGENESIS; ANTIMONY; BISMUTH; CADMIUM; CESIUM; COBALT; GALLIUM; GEOCHEMISTRY; GEOLOGIC HISTORY; GOLD; INDIUM; NEUTRON ACTIVATION ANALYSIS; ORIGIN; RUBIDIUM; SELENIUM; SILVER; TELLURIUM; THALLIUM; ZINC; ACTIVATION ANALYSIS; ALKALI METALS; CHEMICAL ANALYSIS; CHEMISTRY; ELEMENTS; METALS; METEORITES; SEMIMETALS; STONE METEORITES; TRANSITION ELEMENTS; 580000* - Geosciences

Citation Formats

Xiao, Xiaoyue, and Lipschutz, M E. Chemical studies of H chondrites: III. Regolith evolution of the Fayetteville chondrite parent. United States: N. p., 1991. Web. doi:10.1016/0016-7037(91)90499-U.
Xiao, Xiaoyue, & Lipschutz, M E. Chemical studies of H chondrites: III. Regolith evolution of the Fayetteville chondrite parent. United States. https://doi.org/10.1016/0016-7037(91)90499-U
Xiao, Xiaoyue, and Lipschutz, M E. 1991. "Chemical studies of H chondrites: III. Regolith evolution of the Fayetteville chondrite parent". United States. https://doi.org/10.1016/0016-7037(91)90499-U.
@article{osti_5142514,
title = {Chemical studies of H chondrites: III. Regolith evolution of the Fayetteville chondrite parent},
author = {Xiao, Xiaoyue and Lipschutz, M E},
abstractNote = {Data for Ag, Au, Bi, Cd, Co, Cs, Ga, In, Rb, Sb, Se, Te, Tl, and Zn in consortium samples of solar-gas- and track-rich dark matrix, and dark and light clasts in the Fayetteville H chondrite regolith breccia were determined by radiochemical neutron activation analysis. The matrix proved chemically homogeneous at a level never before observed in an ordinary chondrite. Most dark clasts had similar mean trace element concentrations as matrix but were compositionally much more heterogeneous. Two clasts were unusual, one having apparently formed from impact-melted soil, the other representing a mixture of 90% matrix-10% C2M chondrite. The single light clast proved compositionally similar to H4-6 chondrite falls except for its higher contents of labile Bi, Cd, In, and Tl. Relative to matrix, all other samples seemed Cs-deficient. Other H chondrite regolith breccias studied in the past had shown peculiar Ca and/or Rb contents so that these alkalis seem diagnostic of such breccias. Dark portions of such breccias apparently represent compacted regolith soil produced by isochemical comminution of normal dark and light clasts. The dark clasts, in turn, likely represent primordial nebular condensate, although it is possible that they represent planetary cold traps that garnered labile elements generated elsewhere in the parent body.},
doi = {10.1016/0016-7037(91)90499-U},
url = {https://www.osti.gov/biblio/5142514}, journal = {Geochimica et Cosmochimica Acta; (United States)},
issn = {0016-7037},
number = ,
volume = 55:11,
place = {United States},
year = {Fri Nov 01 00:00:00 EST 1991},
month = {Fri Nov 01 00:00:00 EST 1991}
}