Nature of the fossil evidence - Moon and meteorites
The nature of the fossil evidence to be found in extraterrestrial materials concerning the history of solar activity is reviewed. The various types of lunar rocks and meteorites containing evidence of exposure to solar radiations are distinguished, including igneous rocks, breccias, glassy agglutina...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19810064399 2023-05-15T13:46:48+02:00 Nature of the fossil evidence - Moon and meteorites Walker, R. M. Unclassified, Unlimited, Publicly available JAN 1, 1980 http://ntrs.nasa.gov/search.jsp?R=19810064399 unknown http://ntrs.nasa.gov/search.jsp?R=19810064399 Accession ID: 81A48803 Copyright Other Sources 91 Conference on The ancient sun: Fossil record in the earth, moon and meteorites; October 16-19, 1979; Boulder, CO 1980 ftnasantrs 2012-02-15T14:44:01Z The nature of the fossil evidence to be found in extraterrestrial materials concerning the history of solar activity is reviewed. The various types of lunar rocks and meteorites containing evidence of exposure to solar radiations are distinguished, including igneous rocks, breccias, glassy agglutinates, single mineral crystals, carbonaceous meteorites, and the Antarctic meteorites, some of which fell to earth as much as a million years ago. The characteristic effects of energetic particles from space in materials are then examined, including ion implantation and surface radiation damage to a depth of several hundred A by the solar wind, radioactivity, electron trapping and track production induced by solar flares to depths from millimeters to centimeters, and spallation due to galactic cosmic rays at depths from centimeters to meters. Complications in the interpretation of radiation exposure histories represented by dynamic surface processes, the nonsolar origin of some trapped elements, and difficulties in determining the duration and epoch of surface exposure of individual crystals are also noted. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic The Antarctic |
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NASA Technical Reports Server (NTRS) |
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91 |
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91 Walker, R. M. Nature of the fossil evidence - Moon and meteorites |
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91 |
description |
The nature of the fossil evidence to be found in extraterrestrial materials concerning the history of solar activity is reviewed. The various types of lunar rocks and meteorites containing evidence of exposure to solar radiations are distinguished, including igneous rocks, breccias, glassy agglutinates, single mineral crystals, carbonaceous meteorites, and the Antarctic meteorites, some of which fell to earth as much as a million years ago. The characteristic effects of energetic particles from space in materials are then examined, including ion implantation and surface radiation damage to a depth of several hundred A by the solar wind, radioactivity, electron trapping and track production induced by solar flares to depths from millimeters to centimeters, and spallation due to galactic cosmic rays at depths from centimeters to meters. Complications in the interpretation of radiation exposure histories represented by dynamic surface processes, the nonsolar origin of some trapped elements, and difficulties in determining the duration and epoch of surface exposure of individual crystals are also noted. |
format |
Other/Unknown Material |
author |
Walker, R. M. |
author_facet |
Walker, R. M. |
author_sort |
Walker, R. M. |
title |
Nature of the fossil evidence - Moon and meteorites |
title_short |
Nature of the fossil evidence - Moon and meteorites |
title_full |
Nature of the fossil evidence - Moon and meteorites |
title_fullStr |
Nature of the fossil evidence - Moon and meteorites |
title_full_unstemmed |
Nature of the fossil evidence - Moon and meteorites |
title_sort |
nature of the fossil evidence - moon and meteorites |
publishDate |
1980 |
url |
http://ntrs.nasa.gov/search.jsp?R=19810064399 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19810064399 Accession ID: 81A48803 |
op_rights |
Copyright |
_version_ |
1766245228225757184 |