Skip navigation
Skip navigation

Sm-Nd systematics of zircon

Amelin, Yuri

Description

147Sm-143Nd and 146 Sm- 142Nd systems were studied in nineteen 3.32-4.02 Ga zircon grains from Jack Hills metaconglomerate, 12 of which were previously analyzed for Lu-Hf. Nd concentrations in the zircons are 0.9-20 ppm. The amount of Nd recovered was between 13 and 446 pg. The analytical precision of 142Nd/144Nd and 143Nd/144Nd ratios varied between 0.004% and 0.08% (2σm) depending on the sample size. The 147Sm/144Nd ratios vary from 0.4 to 1.2. 143Nd/144Nd ratios are variably radiogenic, from...[Show more]

dc.contributor.authorAmelin, Yuri
dc.date.accessioned2015-12-08T22:39:15Z
dc.identifier.issn0009-2541
dc.identifier.urihttp://hdl.handle.net/1885/36170
dc.description.abstract147Sm-143Nd and 146 Sm- 142Nd systems were studied in nineteen 3.32-4.02 Ga zircon grains from Jack Hills metaconglomerate, 12 of which were previously analyzed for Lu-Hf. Nd concentrations in the zircons are 0.9-20 ppm. The amount of Nd recovered was between 13 and 446 pg. The analytical precision of 142Nd/144Nd and 143Nd/144Nd ratios varied between 0.004% and 0.08% (2σm) depending on the sample size. The 147Sm/144Nd ratios vary from 0.4 to 1.2. 143Nd/144Nd ratios are variably radiogenic, from 0.5125 to 0.5346. Combined interpretation of 147Sm- 143Nd and U-Pb systems shows that LREE in zircons are a mixture of a primary component with high Sm/Nd (>1.6-2.0), and a secondary, younger component with low Sm/Nd. Determination of initial ε143Nd of ancient zircons with a precision and accuracy sufficient for petrogenetic interpretations may not be possible because of large errors in the 147Sm/144Nd ratio, which propagate to the uncertainty of ε143Nd. Additionally, the ε143Nd values are biased by the presence of secondary Nd of unknown age and isotopic composition in more altered zircons. The 147Sm-143Nd system is more promising as a gauge for this secondary, alteration-related REE component in zircon. Application of the 146Sm-142Nd system in zircon to determine the timing of early terrestrial differentiation is promising. It will require advancement of the analytical procedures to achieve the lowest possible blanks and maximum sensitivity. Ion yield as high as 20-30% will be required.
dc.publisherElsevier
dc.sourceChemical Geology
dc.subjectKeywords: Archean; crustal evolution; geochemistry; geochronology; samarium-neodymium dating; zircon 146Sm-142Nd; 147Sm-143Nd; Archean; Crustal evolution; Hadean; U-Pb; Zircon
dc.titleSm-Nd systematics of zircon
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume211
dc.date.issued2004
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationu4047674xPUB133
local.type.statusPublished Version
local.contributor.affiliationAmelin, Yuri, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.startpage375
local.bibliographicCitation.lastpage387
local.identifier.doi10.1016/j.chemgeo.2004.07.004
dc.date.updated2016-02-24T10:31:30Z
local.identifier.scopusID2-s2.0-5744226921
CollectionsANU Research Publications

Download

File Description SizeFormat Image
01_Amelin_Sm-Nd_systematics_of_zir_2004.pdf375.35 kBAdobe PDF    Request a copy


Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.

Updated:  19 May 2020/ Responsible Officer:  University Librarian/ Page Contact:  Library Systems & Web Coordinator