Comparison of Detrital Zircon U-Pb and Muscovite 40Ar/39Ar Ages in the Yangtze Sediment: Implications for Provenance Studies

Detrital zircon U-Pb and muscovite 40Ar/39Ar dating are useful tools for investigating sediment provenance and regional tectonic histories. However, the two types of data from same sample do not necessarily give consistent results. Here, we compare published detrital muscovite 40Ar/39Ar and zircon U...

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Bibliographic Details
Published in:Minerals (Basel) 2020-07, Vol.10 (7), p.643
Main Authors: Sun, Xilin, Kuiper, Klaudia F., Tian, Yuntao, Li, Chang’an, Zhang, Zengjie, Wijbrans, Jan R.
Format: Article
Language:English
Subjects:
Age
Argon
Dilution
Geochronometry
Geological time
Isotopes
Lasers
Lead
Metamorphic rocks
Mica
Muscovite
muscovite 40Ar/39Ar ages
Provenance
Radiometric dating
Rivers
Sediment
sediment provenance
Sediments
Soil erosion
Tectonics
Tributaries
Yangtze River
Zircon
zircon U-Pb ages
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Summary:Detrital zircon U-Pb and muscovite 40Ar/39Ar dating are useful tools for investigating sediment provenance and regional tectonic histories. However, the two types of data from same sample do not necessarily give consistent results. Here, we compare published detrital muscovite 40Ar/39Ar and zircon U-Pb ages of modern sands from the Yangtze River to reveal potential factors controlling differences in their provenance age signals. Detrital muscovite 40Ar/39Ar ages of the major tributaries and main trunk suggest that the Dadu River is a dominant sediment contributor to the lower Yangtze. However, detrital zircon data suggest that the Yalong, Dadu, and Min rivers are the most important sediment suppliers. This difference could be caused by combined effects of lower reaches dilution, laser spot location on zircons and difference in closure temperature and durability between muscovite and zircon. The bias caused by sediment laser spot targeting a core or rim of zircon and zircon reworking should be considered in provenance studies.
ISSN:2075-163X
2075-163X
DOI:10.3390/min10070643