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

doi:10.1515/geochr-2015-0075

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 journal › Article › peer-review

9 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 (D_e) values vary with grain size and the method used for D_e 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 D_e 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 language	English
Pages (from-to)	299-306
Number of pages	8
Journal	Geochronometria
Volume	44
Issue number	1
DOIs	https://doi.org/10.1515/geochr-2015-0075
State	Published - 2017
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2016 H. Yang et al.

Funding

This work was supported by the National Natural Science Foundation of China (41702222) and Basic Scientific Research Fund, Institute of Geology, China Earthquake Administration (IGCEA1418) and State Key Lab. of Earthquake Dynamics of China (LED2016A05) and the International Science and Technology Cooperation Program of China (2008DFA20860). This manuscript was significantly improved by thoughtful comments and suggestions from two anonymous reviewers and the associate editor L.J. Arnold.

Funders	Funder number
Basic Scientific Research Fund
National Natural Science Foundation of China	41702222
China Earthquake Administration	LED2016A05, IGCEA1418
International Science and Technology Cooperation Programme	2008DFA20860

Keywords

Coarse grain
Paleo-earthquake
Quartz OSL dating
Single grain

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10.1515/geochr-2015-0075

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title = "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",

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.",

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author = "Huili Yang and Jie Chen and Naomi Porat and Tao Li and Wenqiao Li and Weipeng Xiao",

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doi = "10.1515/geochr-2015-0075",

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AU - Yang, Huili

AU - Chen, Jie

AU - Porat, Naomi

AU - Li, Tao

AU - Li, Wenqiao

AU - Xiao, Weipeng

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

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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

Abstract

Bibliographical note

Funding

Keywords

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