Coupled Nd-142, Nd-143 and Hf-176 Isotopic Data from 3.6-3.9 Ga Rocks: New Constraints on the Timing of Early Terrestrial Chemical Reservoirs
Increasingly precise data from a range of isotopic decay schemes, including now extinct parent isotopes, from samples of the Earth, Mars, Moon and meteorites are rapidly revising our views of early planetary differentiation. Recognising Nd-142 isotopic variations in terrestrial rocks (which can only...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20070009996 2023-05-15T16:29:41+02:00 Coupled Nd-142, Nd-143 and Hf-176 Isotopic Data from 3.6-3.9 Ga Rocks: New Constraints on the Timing of Early Terrestrial Chemical Reservoirs Brandon, alan D. Nutman, Allen P. Hiess, Joe Bennett, Vickie C. Unclassified, Unlimited, Publicly available [2007] application/pdf http://hdl.handle.net/2060/20070009996 unknown Document ID: 20070009996 http://hdl.handle.net/2060/20070009996 Copyright, Distribution as joint owner in the copyright CASI Lunar and Planetary Science and Exploration Lunar and Planetary Science Conference; 12-16 Mar. 2007; Houston, TX; United States 2007 ftnasantrs 2019-07-21T01:41:52Z Increasingly precise data from a range of isotopic decay schemes, including now extinct parent isotopes, from samples of the Earth, Mars, Moon and meteorites are rapidly revising our views of early planetary differentiation. Recognising Nd-142 isotopic variations in terrestrial rocks (which can only arise from events occurring during the lifetime of now extinct Sm-146 [t(sub 1/2)=103 myr]) has been an on-going quest starting with Harper and Jacobsen. The significance of Nd-142 variations is that they unequivocally reflect early silicate differentiation processes operating in the first 500 myr of Earth history, the key time period between accretion and the beginning of the rock record. The recent establishment of the existence of Nd-142 variations in ancient Earth materials has opened a new range of questions including, how widespread is the evidence of early differentiation, how do Nd-142 compositions vary with time, rock type and geographic setting, and, combined with other types of isotopic and geochemical data, what can Nd-142 isotopic variations reveal about the timing and mechanisms of early terrestrial differentiation? To explore these questions we are determining high precision Nd-142, Nd-143 and Hf-176 isotopic compositions from the oldest well preserved (3.63- 3.87 Ga), rock suites from the extensive early Archean terranes of southwest Greenland and western Australia. Other/Unknown Material Greenland NASA Technical Reports Server (NTRS) Greenland Harper ENVELOPE(-57.050,-57.050,-84.050,-84.050) |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
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ftnasantrs |
language |
unknown |
topic |
Lunar and Planetary Science and Exploration |
spellingShingle |
Lunar and Planetary Science and Exploration Brandon, alan D. Nutman, Allen P. Hiess, Joe Bennett, Vickie C. Coupled Nd-142, Nd-143 and Hf-176 Isotopic Data from 3.6-3.9 Ga Rocks: New Constraints on the Timing of Early Terrestrial Chemical Reservoirs |
topic_facet |
Lunar and Planetary Science and Exploration |
description |
Increasingly precise data from a range of isotopic decay schemes, including now extinct parent isotopes, from samples of the Earth, Mars, Moon and meteorites are rapidly revising our views of early planetary differentiation. Recognising Nd-142 isotopic variations in terrestrial rocks (which can only arise from events occurring during the lifetime of now extinct Sm-146 [t(sub 1/2)=103 myr]) has been an on-going quest starting with Harper and Jacobsen. The significance of Nd-142 variations is that they unequivocally reflect early silicate differentiation processes operating in the first 500 myr of Earth history, the key time period between accretion and the beginning of the rock record. The recent establishment of the existence of Nd-142 variations in ancient Earth materials has opened a new range of questions including, how widespread is the evidence of early differentiation, how do Nd-142 compositions vary with time, rock type and geographic setting, and, combined with other types of isotopic and geochemical data, what can Nd-142 isotopic variations reveal about the timing and mechanisms of early terrestrial differentiation? To explore these questions we are determining high precision Nd-142, Nd-143 and Hf-176 isotopic compositions from the oldest well preserved (3.63- 3.87 Ga), rock suites from the extensive early Archean terranes of southwest Greenland and western Australia. |
format |
Other/Unknown Material |
author |
Brandon, alan D. Nutman, Allen P. Hiess, Joe Bennett, Vickie C. |
author_facet |
Brandon, alan D. Nutman, Allen P. Hiess, Joe Bennett, Vickie C. |
author_sort |
Brandon, alan D. |
title |
Coupled Nd-142, Nd-143 and Hf-176 Isotopic Data from 3.6-3.9 Ga Rocks: New Constraints on the Timing of Early Terrestrial Chemical Reservoirs |
title_short |
Coupled Nd-142, Nd-143 and Hf-176 Isotopic Data from 3.6-3.9 Ga Rocks: New Constraints on the Timing of Early Terrestrial Chemical Reservoirs |
title_full |
Coupled Nd-142, Nd-143 and Hf-176 Isotopic Data from 3.6-3.9 Ga Rocks: New Constraints on the Timing of Early Terrestrial Chemical Reservoirs |
title_fullStr |
Coupled Nd-142, Nd-143 and Hf-176 Isotopic Data from 3.6-3.9 Ga Rocks: New Constraints on the Timing of Early Terrestrial Chemical Reservoirs |
title_full_unstemmed |
Coupled Nd-142, Nd-143 and Hf-176 Isotopic Data from 3.6-3.9 Ga Rocks: New Constraints on the Timing of Early Terrestrial Chemical Reservoirs |
title_sort |
coupled nd-142, nd-143 and hf-176 isotopic data from 3.6-3.9 ga rocks: new constraints on the timing of early terrestrial chemical reservoirs |
publishDate |
2007 |
url |
http://hdl.handle.net/2060/20070009996 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(-57.050,-57.050,-84.050,-84.050) |
geographic |
Greenland Harper |
geographic_facet |
Greenland Harper |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
CASI |
op_relation |
Document ID: 20070009996 http://hdl.handle.net/2060/20070009996 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766019397119377408 |