Assessing mineral fertility and bias in sedimentary provenance studies: examples from the Barents Shelf
Posted on 2019-01-11 - 11:19
The development of laser ablation techniques using inductively coupled plasma mass spectrometry
has enabled the routine and fast acquisition of in situ U–Pb and Pb–Pb isotope ratio data from single detrital
grains or parts of grains. Detrital zircon dating is a technique that is increasingly applied to sedimentary provenance
studies. However, sand routing information using zircon analysis alone may be obscured by repeated
sedimentary reworking cycles and mineral fertility variations. These biases are illustrated by two clear case studies
from the Triassic–Jurassic of the Barents Shelf where the use of U–Pb geochronology on apatite and rutile
and Pb–Pb isotopic data from K-feldspar is highly beneficial for provenance interpretations. In the first case
study, U–Pb apatite ages from the (Induan–Norian) Havert, Kobbe and Snadd formations indicate an evolving
provenance and identify possible episodes of storage within foreland basins prior to delivery onto the Barents
Shelf. In the second case study, U–Pb rutile and Pb isotopic analyses of K-feldspar from the Norian–Pliensbachian
Realgrunnen Subgroup provide a clear distinction between north Norwegian Caledonides and Fennoscandian
Shield sources and suggest that a similar approach may be used to test competing models for sand dispersal
for this Subgroup in regions farther north than this study.
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Flowerdew, Michael J.; Fleming, Edward J.; Morton, Andrew C.; Frei, Dirk; Chew, David M.; Daly, J. Stephen (2019). Assessing mineral fertility and bias in sedimentary provenance studies: examples from the Barents Shelf. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4363838.v1
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AUTHORS (6)
MF
Michael J. Flowerdew
EF
Edward J. Fleming
AM
Andrew C. Morton
DF
Dirk Frei
DC
David M. Chew
JD
J. Stephen Daly