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Rutile crystals as potential trace element and isotope mineral standards for microanalysis

Artikel i vetenskaplig tidskrift
Författare G. L. Luvizotto
Thomas Zack
H. P. Meyer
T. Ludwig
S. Triebold
A. Kronz
C. Munker
D. F. Stockli
S. Prowatke
S. Klemme
D. E. Jacob
H. von Eynatten
Publicerad i Chemical Geology
Volym 261
Nummer/häfte 3-4
Sidor 346-369
ISSN 0009-2541
Publiceringsår 2009
Publicerad vid Institutionen för geovetenskaper
Sidor 346-369
Språk en
Ämnesord homogeneity test, sims calibration, rutile age standard, u-pb geochronology, hf isotopes, isotopic dilution, la-icp-ms, u-pb geochronology, reference glasses, bamble sector, metamorphic rutile, crustal evolution, cooling history, oxygen isotopes, south norway, shear belt
Ämneskategorier Geovetenskap och miljövetenskap, Geokemi, Geologi, Berggrundsgeologi och petrologi, Mineralvetenskap

Sammanfattning

The present paper reports trace element concentrations of 15 elements (V, Cr, Fe, Zr, Nb, Mo, Sn, Sb, Hf, Ta, W, Lu, Pb, Th and U) as well as Ph and Hf isotope data for four relatively homogeneous and large (centimeter size) rutile grains. Methods employed are SIMS, EMP, LA-ICP-MS, ID-MC-ICP-MS and TIMS. For most elements homogeneity is usually within +/- 10% and occasionally variations are even narrower (+/- 5%), particularly in the core of two of the studied grains. The trace element concentrations of the grains span a broad compositional range (e.g., Zr concentrations are ca. 4, 100, 300 and 800 ppm). Provisional concentration values, calculated based on the homogeneity of the element and agreement between techniques, are presented for Zr, Nb, Sn, Sb, Hf, Ta, W and U. The present work represents a significant step forward in finding a suitable mineral standard for rutile microanalysis and encourages not only further search for mineral standards but also applications of rutile in the field of geochemistry and geochronology. In this sense, the rutiles presented here are useful as mineral standard in general in-situ rutile measurements, particularly for Zr-in-rutile thermometry, quantitative provenance studies (Nb and Cr concentrations as index of source rock type) and U-Pb dating. One of the studied grains has a relatively high U concentration (ca. 30 ppm) and rather constant U-Pb ages (1085.1 to 1096.2 Ma (207)Pb/(235)U ages and 1086.3 to 1096.6 Ma, (206)Pb/(238)U ages), favoring its application as an age standard for U-Pb rutile dating. Since Lu concentrations in rutile are very low and Hf concentrations can be relatively high (tens of ppm), detrital rutiles may be suitable for obtaining initial Hf isotope composition of source rocks, therefore the rutiles presented here can be used as calibration material for in-situ rutile Hf isotope studies. (C) 2008 Elsevier B.V. All rights reserved.

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