Journal Article10.1016/0009-2541(86)90094-X
Dating the oldest terrestrial rocks — fact and fiction
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TL;DR: A review of geochronological and related isotopic evidence for the age and total crustal residence time of the oldest known terrestrial rocks, mainly using Rb/1bSr, Sm/ 1bNd and U/1 bPb decay schemes, is presented in this article.
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About: This article is published in Chemical Geology. The article was published on 15 Dec 1986. The article focuses on the topics: Isua Greenstone Belt & Akilia.
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Citations
Evidence for life on Earth before 3,800 million years ago.
Stephen J. Mojzsis,Gustaf Arrhenius,Kevin D. McKeegan,T. M. Harrison,Allen P. Nutman,Clark R.L. Friend +5 more
TL;DR: In this article, ion-microprobe measurements of the carbon-isotope composition of carbonaceous inclusions within grains of apatite (basic calcium phosphate) from the oldest known sediment sequences a approx. 3,800 Myr-old banded iron formation from the Isua supracrustal belt, West Greenland and a similar formation from Akilia island that is possibly older than 3,850 Myr.
Nd and Sr isotopic systematics of river water suspended material: implications for crustal evolution
TL;DR: In this article, the average Sm-Nd and Rb-Sr isotope parameters for the upper continental crust today are refined using a model of the North American continental surface.
986
Early-middle archaean crustal evolution deduced from Lu-Hf and U-Pb isotopic studies of single zircon grains
TL;DR: In this paper, high precision combined single grain U-Pb and Lu-Hf studies of early zircons were performed to obtain more reliable indications of the extent of mantle depletion and crustal recycling in the Archean.
664
The Itsaq Gneiss Complex of southern West Greenland; the world's most extensive record of early crustal evolution (3900-3600 Ma)
TL;DR: The Itsaq Gneiss Complex of southern West Greenland contains the best-preserved occurrences of ⩾ 3600 Ma crust as discussed by the authors, and its known area is ∼ 3000 km2 with almost continuous exposure in some places.
468
The Mean Age of Mantle and Crustal Reservoirs for the Planet Mars
S. B. Jacobsen,Yin Q-Z. +1 more
- 01 Apr 2002
TL;DR: Based on all available isotopic and trace element data for SNCs, the authors obtained a mean age of formation of the crust on Mars of 34 +/- 6 Ga, which is the same as the age of the Earth's crust.
373
References
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TL;DR: In this paper, it was shown that none of the analyzed meteorite samples deviated more than 0.5 e-units from a 4.6-AE reference isochron and defined an initial 4.5-AE value for CHUR using the Juvinas data of Lugmair.
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Neodymium isotopes in the Colorado Front Range and crust–mantle evolution in the Proterozoic
TL;DR: In this article, an empirical model is constructed that may provide accurate crust-formation ages f or rocks of all ages, based on the isotopic data of major rock types of the basement underlying the Rocky Mountains in Colorado.
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A Sm-Nd isotopic study of atmospheric dusts and particulates from major river systems
TL;DR: In this paper, the average ratio of Sm/Nd is about 0.19 in the upper continental crust, and has remained so since the early Archean, thereby precluding the likelihood of major mafic-to-felsic or felsicto-mafic trends in the overall composition of the sedimentary mass through earth history.
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Ore lead isotope ratios in a continuously changing earth
G.L. Cumming,J.R. Richards +1 more
TL;DR: In this paper, a critical re-assessment of the construction of simple ore lead isotopic development curves is followed by three fresh approximations, all designed to involve the minimum possible number of assumptions.
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143Nd/146Nd, a natural tracer: an application to oceanic basalts*
TL;DR: In this paper, the possibility of using 143Nd/146Nd as a natural tracer was examined by analyzing two Hercynian granitic rocks, one carbonatite, three alkali basalts and nine tholeiites.
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