Chronology and isotopic geochemistry of apollo 14 basalts and Skaergard Gabbro, Eastern Greenland
Work completed on Apollo 14 basalts has been published. The two dates obtained from these rocks comprised the oldest and two of the three oldest ages (4.1 and 4.3 billion years) known for lunar maria basalts; thus their ages are important in understanding the moon's earliest history. Owing to t...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19860021943 2023-05-15T16:29:20+02:00 Chronology and isotopic geochemistry of apollo 14 basalts and Skaergard Gabbro, Eastern Greenland Dasch, E. J. Unclassified, Unlimited, Publicly available Jul 1, 1986 http://ntrs.nasa.gov/search.jsp?R=19860021943 unknown http://ntrs.nasa.gov/search.jsp?R=19860021943 Accession ID: 86N31415 No Copyright CASI 91 NASA. Johnson Space Center NASA/American Society for Engineering Educatio; NASA. Johnson Space 1986 ftnasantrs 2012-02-15T16:39:45Z Work completed on Apollo 14 basalts has been published. The two dates obtained from these rocks comprised the oldest and two of the three oldest ages (4.1 and 4.3 billion years) known for lunar maria basalts; thus their ages are important in understanding the moon's earliest history. Owing to the antiquity of these rocks, two more fragments have been dated as part of a second ASEE/NASA SFF program. The new ages are 3.95 and 4.12 billion years, thus further establishing and amplifying the earlier results. This work, although perhaps more interesting for its chronologic information, was begun as a test of chemical and petrographic models. Fragments of Apollo basalt were placed into five categories, based on petrologic and chemical, especially rare-earth element, composition. Isotopic studies were begun in an attempt to determine if the five groups of basalts were related by age or initial isotopic composition (isotopic composition of lava at time of extrusion). Although a few of the representatives of the five groups have the same age and/or initial strontium-isotopic composition, within the analtytical uncertainties, most apparently are unrelated. Petrologic implications of these data will be published in an appropriate journal. Other/Unknown Material Greenland NASA Technical Reports Server (NTRS) Greenland |
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91 Dasch, E. J. Chronology and isotopic geochemistry of apollo 14 basalts and Skaergard Gabbro, Eastern Greenland |
topic_facet |
91 |
description |
Work completed on Apollo 14 basalts has been published. The two dates obtained from these rocks comprised the oldest and two of the three oldest ages (4.1 and 4.3 billion years) known for lunar maria basalts; thus their ages are important in understanding the moon's earliest history. Owing to the antiquity of these rocks, two more fragments have been dated as part of a second ASEE/NASA SFF program. The new ages are 3.95 and 4.12 billion years, thus further establishing and amplifying the earlier results. This work, although perhaps more interesting for its chronologic information, was begun as a test of chemical and petrographic models. Fragments of Apollo basalt were placed into five categories, based on petrologic and chemical, especially rare-earth element, composition. Isotopic studies were begun in an attempt to determine if the five groups of basalts were related by age or initial isotopic composition (isotopic composition of lava at time of extrusion). Although a few of the representatives of the five groups have the same age and/or initial strontium-isotopic composition, within the analtytical uncertainties, most apparently are unrelated. Petrologic implications of these data will be published in an appropriate journal. |
format |
Other/Unknown Material |
author |
Dasch, E. J. |
author_facet |
Dasch, E. J. |
author_sort |
Dasch, E. J. |
title |
Chronology and isotopic geochemistry of apollo 14 basalts and Skaergard Gabbro, Eastern Greenland |
title_short |
Chronology and isotopic geochemistry of apollo 14 basalts and Skaergard Gabbro, Eastern Greenland |
title_full |
Chronology and isotopic geochemistry of apollo 14 basalts and Skaergard Gabbro, Eastern Greenland |
title_fullStr |
Chronology and isotopic geochemistry of apollo 14 basalts and Skaergard Gabbro, Eastern Greenland |
title_full_unstemmed |
Chronology and isotopic geochemistry of apollo 14 basalts and Skaergard Gabbro, Eastern Greenland |
title_sort |
chronology and isotopic geochemistry of apollo 14 basalts and skaergard gabbro, eastern greenland |
publishDate |
1986 |
url |
http://ntrs.nasa.gov/search.jsp?R=19860021943 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
CASI |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19860021943 Accession ID: 86N31415 |
op_rights |
No Copyright |
_version_ |
1766019033762627584 |