TY - JOUR

T1 - Detrital apatite Lu–Hf and U–Pb geochronology applied to the southwestern Siberian margin

AU - Glorie, Stijn

AU - Gillespie, Jack

AU - Simpson, Alexander

AU - Gilbert, Sarah

AU - Khudoley, Andrei

AU - Priyatkina, Nadezhda

AU - Hand, Martin

AU - Kirkland, Christopher L

N1 - Publisher Copyright: © 2022 The Authors. Terra Nova published by John Wiley & Sons Ltd.

PY - 2022/6

Y1 - 2022/6

N2 - Apatite is increasingly used in sedimentary provenance studies. However, detrital apatite U–Pb geochronology can be challenging due to the presence of non-radiogenic Pb, its intermediate closure temperature (~350–550°C) and/or age-resetting by metamorphic/metasomatic processes. The Lu–Hf system in apatite has a higher closure temperature (~675–750°C) and is, therefore, more robust to thermal resetting. Here we present the first detrital apatite Lu–Hf age spectra. We have developed a laser-ablation Lu–Hf dating technique, using reaction-cell mass spectrometry, that allows rapid cost-effective analysis, required for detrital apatite studies. The method is best suited to Precambrian detritus, permitting greater radiogenic Hf ingrowth. Using samples from Siberia, we demonstrate: (1) excellent correlations between U–Pb and Lu–Hf dates for apatites from igneous protoliths; and (2) that Lu–Hf dating can detect primary age information in metamorphic grains. Hence, when used in tandem with U–Pb zircon and apatite geochronology, Lu–Hf apatite dating provides a powerful new tool for provenance studies.

AB - Apatite is increasingly used in sedimentary provenance studies. However, detrital apatite U–Pb geochronology can be challenging due to the presence of non-radiogenic Pb, its intermediate closure temperature (~350–550°C) and/or age-resetting by metamorphic/metasomatic processes. The Lu–Hf system in apatite has a higher closure temperature (~675–750°C) and is, therefore, more robust to thermal resetting. Here we present the first detrital apatite Lu–Hf age spectra. We have developed a laser-ablation Lu–Hf dating technique, using reaction-cell mass spectrometry, that allows rapid cost-effective analysis, required for detrital apatite studies. The method is best suited to Precambrian detritus, permitting greater radiogenic Hf ingrowth. Using samples from Siberia, we demonstrate: (1) excellent correlations between U–Pb and Lu–Hf dates for apatites from igneous protoliths; and (2) that Lu–Hf dating can detect primary age information in metamorphic grains. Hence, when used in tandem with U–Pb zircon and apatite geochronology, Lu–Hf apatite dating provides a powerful new tool for provenance studies.

UR - http://www.scopus.com/inward/record.url?scp=85124714064&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/72f69ad4-246d-3cc8-abfa-6fd44faa8204/

U2 - 10.1111/ter.12580

DO - 10.1111/ter.12580

M3 - Article

AN - SCOPUS:85124714064

VL - 34

SP - 201

EP - 209

JO - Terra Nova

JF - Terra Nova

SN - 0954-4879

IS - 3

ER -