Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite
Terrestrial weathering in meteorites is an important process which alters pristine elemental and isotopic abundances. The Holbrook L6 chondrite fell in 1912. Material was recovered at the time of the fall, in 1931, and 1968. The weathering processes operating on the freshly fallen meteorite in a sem...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19920003710 2023-05-15T13:42:52+02:00 Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite Karlsson, H. R. Jull, A. J. T. Gibson, E. K. Socki, R. A. Unclassified, Unlimited, Publicly available JAN 1, 1991 application/pdf http://hdl.handle.net/2060/19920003710 unknown Document ID: 19920003710 Accession ID: 92N12928 http://hdl.handle.net/2060/19920003710 No Copyright CASI ASTROPHYSICS Lunar and Planetary Inst., Abstracts for the 54th Annual Meeting of the Meteoritical Society; p 217 1991 ftnasantrs 2015-03-15T05:01:06Z Terrestrial weathering in meteorites is an important process which alters pristine elemental and isotopic abundances. The Holbrook L6 chondrite fell in 1912. Material was recovered at the time of the fall, in 1931, and 1968. The weathering processes operating on the freshly fallen meteorite in a semi-arid region of northeastern Arizona have been studied after a ground residence of 19 and 56 years. It has been shown that a large portion of the carbonate material in 7 Antarctic ordinary chondrites either underwent extensive isotopic exchange with atmospheric CO2, or formed recently in the Antarctic environment. In fact it has been demonstrated that hydrated Mg-carbonates, nesquehonite and hydromagnesite, formed in less than 40 years on LEW 85320. In order to help further constrain the effects of terrestrial weathering in meteorites, the carbon and oxygen isotopes extracted from carbonates of three different samples of Holbrook L6: a fresh sample at the time of the fall in 1912, a specimen collected in 1931, and a third specimen collected at the same site in 1968. 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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ftnasantrs |
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ASTROPHYSICS |
spellingShingle |
ASTROPHYSICS Karlsson, H. R. Jull, A. J. T. Gibson, E. K. Socki, R. A. Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite |
topic_facet |
ASTROPHYSICS |
description |
Terrestrial weathering in meteorites is an important process which alters pristine elemental and isotopic abundances. The Holbrook L6 chondrite fell in 1912. Material was recovered at the time of the fall, in 1931, and 1968. The weathering processes operating on the freshly fallen meteorite in a semi-arid region of northeastern Arizona have been studied after a ground residence of 19 and 56 years. It has been shown that a large portion of the carbonate material in 7 Antarctic ordinary chondrites either underwent extensive isotopic exchange with atmospheric CO2, or formed recently in the Antarctic environment. In fact it has been demonstrated that hydrated Mg-carbonates, nesquehonite and hydromagnesite, formed in less than 40 years on LEW 85320. In order to help further constrain the effects of terrestrial weathering in meteorites, the carbon and oxygen isotopes extracted from carbonates of three different samples of Holbrook L6: a fresh sample at the time of the fall in 1912, a specimen collected in 1931, and a third specimen collected at the same site in 1968. |
format |
Other/Unknown Material |
author |
Karlsson, H. R. Jull, A. J. T. Gibson, E. K. Socki, R. A. |
author_facet |
Karlsson, H. R. Jull, A. J. T. Gibson, E. K. Socki, R. A. |
author_sort |
Karlsson, H. R. |
title |
Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite |
title_short |
Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite |
title_full |
Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite |
title_fullStr |
Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite |
title_full_unstemmed |
Carbon and oxygen isotope composition of carbonates from an L6 chondrite: Evidence for terrestrial weathering from the Holbrook meteorite |
title_sort |
carbon and oxygen isotope composition of carbonates from an l6 chondrite: evidence for terrestrial weathering from the holbrook meteorite |
publishDate |
1991 |
url |
http://hdl.handle.net/2060/19920003710 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
CASI |
op_relation |
Document ID: 19920003710 Accession ID: 92N12928 http://hdl.handle.net/2060/19920003710 |
op_rights |
No Copyright |
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1766173712181100544 |