Coarse versus fine-grain quartz optical dating of the sediments related to the 1985 Ms7.1 Wuqia earthquake, northeastern margin of the Pamir salient, China

Huili Yang, Jie Chen, Naomi Porat, Tao Li, Wenqiao Li, Weipeng Xiao

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Optical dating of earthquake related sediments were investigated including one modern sample and three samples from a trench excavated across the 1985 Ms7.4 Wuqia Earthquake surface rupture. The results indicated that equivalent dose (De) values vary with grain size and the method used for De determination. The residual dose of the modern sample is 0.1 ka ( 0.2+0.2-0.1 Gy) for the quartz single grain measurements. Only 1.5-3.6% of the grains have a detectable OSL signal. Single grain quartz ages are similar to the expected ages. Fine grain quartz results overestimate the De values and are much older than single grain quartz and coarse grain quartz small aliquot standardized growth curve (SA-SGC) ages. Single grain quartz OSL dating may be optimal for dating earthquake related deposits, but SA-SGC can save measurement time and has potential for dating some poorly bleaching samples.

Original languageEnglish
Pages (from-to)299-306
Number of pages8
JournalGeochronometria
Volume44
Issue number1
DOIs
StatePublished - 2017
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2016 H. Yang et al.

Keywords

  • Coarse grain
  • Paleo-earthquake
  • Quartz OSL dating
  • Single grain

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