Variation in Luminescence Characteristics and Paramagnetic Defect Centres in Fine-Grained Quartz From a Loess-Palaeosol Sequence in Tajikistan: Implications for Provenance Studies in Aeolian Environments

被引：9

作者：

Dave, Aditi K. ^{[1
,2
]}

Timar-Gabor, Alida ^{[3
,4
]}

Scardia, Giancarlo ^{[5
]}

Safaraliev, Nosir ^{[6
]}

Fitzsimmons, Kathryn E. ^{[1
,2
]}

机构：

[1] Max Planck Inst Chem, Res Grp Terr Palaeoclimates, Mainz, Germany

[2] Univ Tubingen, Dept Geosci, Tubingen, Germany

[3] Babes Bolyai Univ, Fac Environm Sci & Engn, Cluj Napoca, Romania

[4] Babes Bolyai Univ, Interdisciplinary Res Inst Bionanoscience, Cluj Napoca, Romania

[5] Univ Estadual Paulista UNESP, Inst Geociencias & Ciencias Exatas, Rio Claro, Brazil

[6] Tajik Natl Univ, Dept Geol, Dushanbe, Tajikistan

来源：

FRONTIERS IN EARTH SCIENCE | 2022年 / 10卷

关键词：

provenance; luminescence sensitivity; defect centres; Tajikistan; Central Asia; loess; RESONANCE SIGNAL INTENSITY; NORTHERN CHINA; CENTRAL-ASIA; ATMOSPHERIC CIRCULATION; SENSITIVITY CHANGES; OSL COMPONENTS; DUST; SEDIMENTS; DEPOSITS; DYNAMICS;

D O I：

10.3389/feart.2022.835281

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Trapped charge characteristics in quartz are of increasing interest for their utility as indicators of sediment provenance. These include sensitivity of optically stimulated luminescence (OSL) and thermoluminescence (TL) signal and paramagnetic E-1' defect centre in quartz. Up until now, these methods have largely been used independently in provenance investigations, especially in aeolian systems. Variations in quartz OSL and TL signal sensitivity in loess-palaeosol sequences has been linked to shifts in sediment source corresponding to climatic fluctuations. However, the processes responsible for observed variation in OSL and TL sensitivity in quartz, including its link to the original rock source and/or its sedimentary history, remains a topic of contention. On the other hand, the intensity of E-1' defect centre in quartz is known to reflect the provenance of quartz, and is also routinely utilised as a provenance indicator in aeolian studies. In this study we aim to understand the variations in E-1' intensity and OSL (and TL) sensitivity by direct comparison of these characteristics in fine-grained quartz from a c. 60 m-thick loess-palaeosol sequence in Tajikistan. In doing so, we investigate the natural processes that may have led to variability in trapped-charge characteristics over the c. 500 ky timespan covered by the sequence. Our results suggest that apart from the inherent link to its provenance signature, the observed luminescence sensitivity of quartz especially in loess-palaeosol sequences are largely influenced by depositional and post-depositional processes during soil formation.

引用

页数：10