Natural Titanite Reference Materials for In Situ U‐Pb and Sm‐Nd Isotopic Measurements by LA‐(MC)‐ICP‐MS

Titanite is a common accessory mineral that preferentially incorporates considerable amounts of U and light rare earth elements in its structure, making it a versatile mineral for in situ U‐Pb dating and Sm‐Nd isotopic measurement. Here, we present in situ U‐Pb ages and Sm‐Nd isotope measurement res...

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Bibliographic Details
Published in:Geostandards and geoanalytical research 2019-09, Vol.43 (3), p.355-384
Main Authors: Ma, Qian, Evans, Noreen J., Ling, Xiao‐Xiao, Yang, Jin‐Hui, Wu, Fu‐Yuan, Zhao, Zhi‐Dan, Yang, Yue‐Heng
Format: Article
Language:English
Subjects:
Cenozoic
Crystals
Dating
Earth
in situ analysis
Isotopes
LA‐(MC)‐ICP‐MS
Lead
Measurement
Rare earth elements
reference material
Reference materials
Sm‐Nd isotopes
Titanite
U‐Pb geochronology
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Summary:Titanite is a common accessory mineral that preferentially incorporates considerable amounts of U and light rare earth elements in its structure, making it a versatile mineral for in situ U‐Pb dating and Sm‐Nd isotopic measurement. Here, we present in situ U‐Pb ages and Sm‐Nd isotope measurement results for four well‐known titanite reference materials (Khan, BLR‐1, OLT1 and MKED1) and eight titanite crystals that could be considered potential reference material candidates (Ontario, YQ‐82, T3, T4, TLS‐36, NW‐IOA, Pakistan and C253), with ages ranging from ~ 20 Ma to ~ 1840 Ma. Results indicate that BLR‐1, OLT1, Ontario, MKED1 and T3 titanite have relatively homogeneous Sm‐Nd isotopes and low common Pb and thus can serve as primary reference materials for U‐Pb and Sm‐Nd microanalysis. YQ‐82 and T4 titanite can be used as secondary reference materials for in situ U‐Pb analysis because of their low common Pb. However, internal structures and mineral inclusions in YQ‐82 will require careful selection of suitable target domains. Pakistan titanite is almost concordant with an age of 21 Ma and can be used as a reference material when dating Cenozoic titanite samples. Key Points In situ measurement results for trace element mass fractions and U‐Pb and Sm‐Nd isotope ratios from natural titanite crystals are presented. Sm‐Nd isotope ratios of natural titanites are precisely determined by ID‐MC‐ICP‐MS. BLR‐1, OLT1, Ontario, MKED1 and T3 can serve as ideal primary reference materials.
ISSN:1639-4488
1751-908X
DOI:10.1111/ggr.12264