Chemical and isotopic study of extraterrestrial particles from the ocean floor

An Rb-Sr isotopic analysis of deep-sea spherules (DSS) from the Pacific, vesicular iridium-rich glassy objects (VIRGO) from an Antarctic-Ocean diatomaceous-ooze core, and equigranular objects (EGO) associated with or included in VIRGO, is reported. The techniques of sample collection, preparation, c...

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Main Authors: Papanastassiou, D. A., Wasserburg, G. J., Brownlee, D. E.
Format: Other/Unknown Material
Language:unknown
Published: 1983
Subjects:
91
Antarctic
Pacific
Antarctic Ocean
Antarc*
Online Access:http://ntrs.nasa.gov/search.jsp?R=19830068180
id ftnasantrs:oai:casi.ntrs.nasa.gov:19830068180
record_format openpolar
spelling ftnasantrs:oai:casi.ntrs.nasa.gov:19830068180 2023-05-15T13:35:32+02:00 Chemical and isotopic study of extraterrestrial particles from the ocean floor Papanastassiou, D. A. Wasserburg, G. J. Brownlee, D. E. Unclassified, Unlimited, Publicly available Sep 1, 1983 http://ntrs.nasa.gov/search.jsp?R=19830068180 unknown http://ntrs.nasa.gov/search.jsp?R=19830068180 Accession ID: 83A49398 Copyright Other Sources 91 Earth and Planetary Science Letters; 64; 3, Se; Sept 1983 ftnasantrs 2012-02-15T15:33:34Z An Rb-Sr isotopic analysis of deep-sea spherules (DSS) from the Pacific, vesicular iridium-rich glassy objects (VIRGO) from an Antarctic-Ocean diatomaceous-ooze core, and equigranular objects (EGO) associated with or included in VIRGO, is reported. The techniques of sample collection, preparation, chemical analysis, and isotopic analysis (by mass spectrometry) are described in detail, and the results are presented in tables. The Sr-87/Sr-86 determination has a precision of 1-2 percent in microsamples of 2-8 x 10 to the 11th Sr atoms. The DSS are found to have Sr concentrations and Sr-87/Sr-86 (0.730-0.757) typical of chondritic meteorites. Extreme Rb depletion is attributed to volatization during meteoroid atmospheric heating. The VIRGO, while having major-element compositions like that of meteorites and high Ir levels suggesting extraterrestrial origin, have Sr-87/Sr-86 = 0.703-0.705; and the associated EGO has Sr-87/Sr-86 = 0.701 + or - 0.001, typical of MORB or basaltic achondrites. Hence their extraterrestrial origin is not proved, and some lithic component other than the EGO must be the source of the high Ir concentration. Other/Unknown Material Antarc* Antarctic Antarctic Ocean NASA Technical Reports Server (NTRS) Antarctic Pacific Antarctic Ocean
institution Open Polar
collection NASA Technical Reports Server (NTRS)
op_collection_id ftnasantrs
language unknown
topic 91
spellingShingle 91
Papanastassiou, D. A.
Wasserburg, G. J.
Brownlee, D. E.
Chemical and isotopic study of extraterrestrial particles from the ocean floor
topic_facet 91
description An Rb-Sr isotopic analysis of deep-sea spherules (DSS) from the Pacific, vesicular iridium-rich glassy objects (VIRGO) from an Antarctic-Ocean diatomaceous-ooze core, and equigranular objects (EGO) associated with or included in VIRGO, is reported. The techniques of sample collection, preparation, chemical analysis, and isotopic analysis (by mass spectrometry) are described in detail, and the results are presented in tables. The Sr-87/Sr-86 determination has a precision of 1-2 percent in microsamples of 2-8 x 10 to the 11th Sr atoms. The DSS are found to have Sr concentrations and Sr-87/Sr-86 (0.730-0.757) typical of chondritic meteorites. Extreme Rb depletion is attributed to volatization during meteoroid atmospheric heating. The VIRGO, while having major-element compositions like that of meteorites and high Ir levels suggesting extraterrestrial origin, have Sr-87/Sr-86 = 0.703-0.705; and the associated EGO has Sr-87/Sr-86 = 0.701 + or - 0.001, typical of MORB or basaltic achondrites. Hence their extraterrestrial origin is not proved, and some lithic component other than the EGO must be the source of the high Ir concentration.
format Other/Unknown Material
author Papanastassiou, D. A.
Wasserburg, G. J.
Brownlee, D. E.
author_facet Papanastassiou, D. A.
Wasserburg, G. J.
Brownlee, D. E.
author_sort Papanastassiou, D. A.
title Chemical and isotopic study of extraterrestrial particles from the ocean floor
title_short Chemical and isotopic study of extraterrestrial particles from the ocean floor
title_full Chemical and isotopic study of extraterrestrial particles from the ocean floor
title_fullStr Chemical and isotopic study of extraterrestrial particles from the ocean floor
title_full_unstemmed Chemical and isotopic study of extraterrestrial particles from the ocean floor
title_sort chemical and isotopic study of extraterrestrial particles from the ocean floor
publishDate 1983
url http://ntrs.nasa.gov/search.jsp?R=19830068180
op_coverage Unclassified, Unlimited, Publicly available
geographic Antarctic
Pacific
Antarctic Ocean
geographic_facet Antarctic
Pacific
Antarctic Ocean
genre Antarc*
Antarctic
Antarctic Ocean
genre_facet Antarc*
Antarctic
Antarctic Ocean
op_source Other Sources
op_relation http://ntrs.nasa.gov/search.jsp?R=19830068180
Accession ID: 83A49398
op_rights Copyright
_version_ 1766066924505006080

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