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Optical dating of aeolian and fluvial sediments in north Tian Shan range, China: luminescence characteristics and methodological aspects

Journal Article


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Abstract


  • Loess and fluvial sand are important materials for dating river terraces and alluvial fans. This study focuses on the methodological aspects of dating loess and fluvial deposits from the northern flank of the Tian Shan range, China, using sand-sized quartz and potassium (K) feldspar. Luminescence characteristics of quartz and K-feldspar were studied for searching suitable dating procedures. Our results indicate that 1) most quartz aliquots were contaminated by feldspar, and were dated using a post-infrared optically stimulated luminescence (post-IR OSL) procedure. A Fast ratio acceptance threshold of 15 can be applied to select these aliquots with post-IR OSL signals dominated by quartz OSL; 2) the multi-elevated-temperature post-IR IR stimulated luminescence (MET-pIRIR) procedures are applicable for K-feldspar. A test dose of ∼30% of the natural dose is appropriate for dating of older (>10 ka) samples. An Age (T, t) plateau test can be used to evaluate the dating results; 3) for the loess samples, both quartz and K-feldspar were well bleached and are suitable for dating. Dating using K-feldspar is preferred for its higher efficiency; 4) for the fluvial sand samples, only the quartz grains were fully bleached. Single-aliquot dating of quartz gives reliable ages.

UOW Authors


  •   Fu, Xiao (external author)
  •   Li, Sheng-Hua (external author)
  •   Li, Bo

Publication Date


  • 2015

Citation


  • Fu, X., Li, S. & Li, B. (2015). Optical dating of aeolian and fluvial sediments in north Tian Shan range, China: luminescence characteristics and methodological aspects. Quaternary Geochronology, 30 (Part B), 161-167.

Scopus Eid


  • 2-s2.0-84947046990

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4526&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3503

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 161

End Page


  • 167

Volume


  • 30

Issue


  • Part B

Place Of Publication


  • Netherlands

Abstract


  • Loess and fluvial sand are important materials for dating river terraces and alluvial fans. This study focuses on the methodological aspects of dating loess and fluvial deposits from the northern flank of the Tian Shan range, China, using sand-sized quartz and potassium (K) feldspar. Luminescence characteristics of quartz and K-feldspar were studied for searching suitable dating procedures. Our results indicate that 1) most quartz aliquots were contaminated by feldspar, and were dated using a post-infrared optically stimulated luminescence (post-IR OSL) procedure. A Fast ratio acceptance threshold of 15 can be applied to select these aliquots with post-IR OSL signals dominated by quartz OSL; 2) the multi-elevated-temperature post-IR IR stimulated luminescence (MET-pIRIR) procedures are applicable for K-feldspar. A test dose of ∼30% of the natural dose is appropriate for dating of older (>10 ka) samples. An Age (T, t) plateau test can be used to evaluate the dating results; 3) for the loess samples, both quartz and K-feldspar were well bleached and are suitable for dating. Dating using K-feldspar is preferred for its higher efficiency; 4) for the fluvial sand samples, only the quartz grains were fully bleached. Single-aliquot dating of quartz gives reliable ages.

UOW Authors


  •   Fu, Xiao (external author)
  •   Li, Sheng-Hua (external author)
  •   Li, Bo

Publication Date


  • 2015

Citation


  • Fu, X., Li, S. & Li, B. (2015). Optical dating of aeolian and fluvial sediments in north Tian Shan range, China: luminescence characteristics and methodological aspects. Quaternary Geochronology, 30 (Part B), 161-167.

Scopus Eid


  • 2-s2.0-84947046990

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4526&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3503

Has Global Citation Frequency


Number Of Pages


  • 6

Start Page


  • 161

End Page


  • 167

Volume


  • 30

Issue


  • Part B

Place Of Publication


  • Netherlands