Chemical and physical studies of type 3 chondrites. II Thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes
Thermoluminescence (TL) sensitivity values for sixteen type 3 ordinary chondrites, fourteen of them from Antarctica, have been measured. The values obtained (normalized to the TL sensitivity of the Dhajala meteorite) range from 1.6 (Allan Hills A77216) to 0.010 (Allan Hills A77176), and include two...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19840035691 2023-05-15T13:40:59+02:00 Chemical and physical studies of type 3 chondrites. II Thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes Sears, D. W. G. Weeks, K. S. Unclassified, Unlimited, Publicly available Nov 15, 1983 http://ntrs.nasa.gov/search.jsp?R=19840035691 unknown http://ntrs.nasa.gov/search.jsp?R=19840035691 Accession ID: 84A18478 Copyright Other Sources 91 Journal of Geophysical Research, Supplement; 88; B301-B31 1983 ftnasantrs 2012-02-15T15:49:23Z Thermoluminescence (TL) sensitivity values for sixteen type 3 ordinary chondrites, fourteen of them from Antarctica, have been measured. The values obtained (normalized to the TL sensitivity of the Dhajala meteorite) range from 1.6 (Allan Hills A77216) to 0.010 (Allan Hills A77176), and include two (Reckling Peak A80207 and Allan Hills A77176) that are particularly low. They fill a hiatus in the TL distribution that previously existed between St. Mary's County and Bishunpur, the latter being a meteorite with one of the lowest TL sensitivities known. The histogram of TL sensitivity values now shows a single distribution with higher values preferred; it resembles the histogram for L chondrites occupying the petrologic types 3, 4, 5, and 6. There is a tendency for the TL sensitivity of meteorites to decrease as delta O-18 increases. Theoretically, it is possible that the range of delta O-18 values observed may reflect progressive loss of O in the form of CO at very low temperatures, but very restrictive physical conditions and a complex history seem to be required. Other/Unknown Material Antarc* Antarctica NASA Technical Reports Server (NTRS) Allan Hills ENVELOPE(159.667,159.667,-76.717,-76.717) Reckling Peak ENVELOPE(159.250,159.250,-76.267,-76.267) |
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91 Sears, D. W. G. Weeks, K. S. Chemical and physical studies of type 3 chondrites. II Thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes |
topic_facet |
91 |
description |
Thermoluminescence (TL) sensitivity values for sixteen type 3 ordinary chondrites, fourteen of them from Antarctica, have been measured. The values obtained (normalized to the TL sensitivity of the Dhajala meteorite) range from 1.6 (Allan Hills A77216) to 0.010 (Allan Hills A77176), and include two (Reckling Peak A80207 and Allan Hills A77176) that are particularly low. They fill a hiatus in the TL distribution that previously existed between St. Mary's County and Bishunpur, the latter being a meteorite with one of the lowest TL sensitivities known. The histogram of TL sensitivity values now shows a single distribution with higher values preferred; it resembles the histogram for L chondrites occupying the petrologic types 3, 4, 5, and 6. There is a tendency for the TL sensitivity of meteorites to decrease as delta O-18 increases. Theoretically, it is possible that the range of delta O-18 values observed may reflect progressive loss of O in the form of CO at very low temperatures, but very restrictive physical conditions and a complex history seem to be required. |
format |
Other/Unknown Material |
author |
Sears, D. W. G. Weeks, K. S. |
author_facet |
Sears, D. W. G. Weeks, K. S. |
author_sort |
Sears, D. W. G. |
title |
Chemical and physical studies of type 3 chondrites. II Thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes |
title_short |
Chemical and physical studies of type 3 chondrites. II Thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes |
title_full |
Chemical and physical studies of type 3 chondrites. II Thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes |
title_fullStr |
Chemical and physical studies of type 3 chondrites. II Thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes |
title_full_unstemmed |
Chemical and physical studies of type 3 chondrites. II Thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes |
title_sort |
chemical and physical studies of type 3 chondrites. ii thermoluminescence of sixteen type 3 ordinary chondrites and relationships with oxygen isotopes |
publishDate |
1983 |
url |
http://ntrs.nasa.gov/search.jsp?R=19840035691 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(159.667,159.667,-76.717,-76.717) ENVELOPE(159.250,159.250,-76.267,-76.267) |
geographic |
Allan Hills Reckling Peak |
geographic_facet |
Allan Hills Reckling Peak |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19840035691 Accession ID: 84A18478 |
op_rights |
Copyright |
_version_ |
1766144097130643456 |