DOI: 10.1016/j.palaeo.2014.02.014
论文题名: Assessing the time of final deposition of Youngest Toba Tuff deposits in the Middle Son Valley, northern India
作者: Neudorf C.M. ; Roberts R.G. ; Jacobs Z.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2014
卷: 399 起始页码: 127
结束页码: 139
语种: 英语
英文关键词: Archaeology
; India
; Optical dating
; Palaeoenvironments
; Toba eruption
; YTT
英文摘要: 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. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69395
Appears in Collections: 过去全球变化的重建
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作者单位: Centre for Archaeological Science, School of Earth and Environmental Sciences, University of Wollongong, Wollongong, NSW 2522, Australia; Department of Geography, University of the Fraser Valley, Abbotsford, BC V2S 7M8, Canada
Recommended Citation:
Neudorf C.M.,Roberts R.G.,Jacobs Z.. Assessing the time of final deposition of Youngest Toba Tuff deposits in the Middle Son Valley, northern India[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2014-01-01,399