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Assessing the time of final deposition of Youngest Toba Tuff deposits in the Middle Son Valley, northern India

Journal Article


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Abstract


  • We present optical ages for quartz and K-feldspar grains extracted from sedimentary deposits above and below Youngest Toba Tuff (YTT) at two localities in the Middle Son Valley (MSV), Madhya Pradesh, India. These ash deposits have been the focus of past palaeoenvironmental investigations that aim to understand the effects of the ~ 74 ka Toba super-eruption on ecosystems and human populations in northern India. Age estimates from both quartz and feldspar grains post-date the Toba eruption and single-grain age distributions suggest that YTT ash-bearing sediments in the MSV are mainly composed of a mixture of recently sun-exposed, flood-transported grains and older grains from slumped river bank deposits. This study highlights the hazards of using YTT ash as an isochronous marker horizon in the MSV, and illustrates the need to independently assess the time of final deposition of reworked volcanic ash beds in sedimentary sequences used in stratigraphic correlations and palaeoenvironmental reconstructions.

Publication Date


  • 2014

Citation


  • Neudorf, C. M., Roberts, R. G. & Jacobs, Z. (2014). Assessing the time of final deposition of Youngest Toba Tuff deposits in the Middle Son Valley, northern India. Palaeogeography, Palaeoclimatology, Palaeoecology, 399 127-139.

Scopus Eid


  • 2-s2.0-84896747679

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2600&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/1582

Number Of Pages


  • 12

Start Page


  • 127

End Page


  • 139

Volume


  • 399

Abstract


  • We present optical ages for quartz and K-feldspar grains extracted from sedimentary deposits above and below Youngest Toba Tuff (YTT) at two localities in the Middle Son Valley (MSV), Madhya Pradesh, India. These ash deposits have been the focus of past palaeoenvironmental investigations that aim to understand the effects of the ~ 74 ka Toba super-eruption on ecosystems and human populations in northern India. Age estimates from both quartz and feldspar grains post-date the Toba eruption and single-grain age distributions suggest that YTT ash-bearing sediments in the MSV are mainly composed of a mixture of recently sun-exposed, flood-transported grains and older grains from slumped river bank deposits. This study highlights the hazards of using YTT ash as an isochronous marker horizon in the MSV, and illustrates the need to independently assess the time of final deposition of reworked volcanic ash beds in sedimentary sequences used in stratigraphic correlations and palaeoenvironmental reconstructions.

Publication Date


  • 2014

Citation


  • Neudorf, C. M., Roberts, R. G. & Jacobs, Z. (2014). Assessing the time of final deposition of Youngest Toba Tuff deposits in the Middle Son Valley, northern India. Palaeogeography, Palaeoclimatology, Palaeoecology, 399 127-139.

Scopus Eid


  • 2-s2.0-84896747679

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2600&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/1582

Number Of Pages


  • 12

Start Page


  • 127

End Page


  • 139

Volume


  • 399