Chronology of desert margin in western India using improved luminescence dating protocols

Journal of earth system science

Naveen Chauhan^1¹  P Morthekai^1,2,3³ 

[1]AMOPH, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India.^1

[2]Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226 007, India.^3

[3]Institute of Seismological Research, Raisan, Gandhinagar 382 009, India.^2

关键词: Quartz;    feldspar;    luminescence;    dose distribution;    NCF-SAR;    beta heterogeneity;    India;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The present study provides improved chronology for the desert margin fluvial sediments of semi-arid region located in the Mahi river basin, western India. The sequence has preserved a near-continuous record of climate change since the Last Interglacial. An earlier attempt of dating based on feldspar IRSL chronology shows a combined effect of anomalous fading and unbleached components resulting in age inversions. The present work tries to explore the possibility of using blue light stimulated luminescence (BLSL) of quartz, infra-red stimulated luminescence (IRSL) of feldspar and the newly developed methodologies, like natural correction factor based single aliquot regeneration (NCF-SAR) protocol and decision making schemes based on distribution of doses and beta heterogeneity concept for luminescence dating of sediments. Observations suggest that quartz suffered from significant sensitivity changes during natural signal measurement and partial bleaching. A combination of NCF-SAR protocol and sample specific equivalent dose computation helped in arriving at better age estimate for present samples. The study also compares the criteria for the selection of different age models that are used at present. The age of the alluvial sequence is now bracketed between 10 ka (upper aeolian unit) and 75 ka (lowermost fluvial unit).

【 授权许可】

CC BY