Geochemical and Sr-Nd isotopic variations in a deep-sea sediment core from Eastern Indian Ocean: constraints on dust provenances, paleoclimate and volcanic eruption history in the last 300,000 years

Liu, Entao, Wang, Xuan-Ce, Zhao, Jian-xin and Wang, Xuan (2015) Geochemical and Sr-Nd isotopic variations in a deep-sea sediment core from Eastern Indian Ocean: constraints on dust provenances, paleoclimate and volcanic eruption history in the last 300,000 years. Marine Geology, 367 38-49. doi:10.1016/j.margeo.2015.05.005


Author Liu, Entao
Wang, Xuan-Ce
Zhao, Jian-xin
Wang, Xuan
Title Geochemical and Sr-Nd isotopic variations in a deep-sea sediment core from Eastern Indian Ocean: constraints on dust provenances, paleoclimate and volcanic eruption history in the last 300,000 years
Journal name Marine Geology   Check publisher's open access policy
ISSN 0025-3227
1872-6151
Publication date 2015-09-01
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.margeo.2015.05.005
Volume 367
Start page 38
End page 49
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Collection year 2016
Language eng
Formatted abstract
This study reported geochemical and Sr–Nd isotopic variation of fine-grained mineral components in a deep-sea piston core G6-4, south of the Sumba Island, Eastern Indian Ocean. The new data enables us to characterize dust contributions from Australian continent and volcanic eruption history in the adjacent volcanic arc over approximately the last 300,000 years. The geochemical and isotopic features of the fine-grained components (< 20 μm) in Core G6-4 are broadly consistent with mixing between aeolian dusts from the Australian continent and volcanic ashes of the Sunda arcs. Simple two-component modeling shows that the majority of the core samples probably are composed of 50–80% aeolian dusts derived from the Australian continent. Sr–Nd isotopic ratios are fairly uniform for samples older than 180 ka, in contrast with those of the samples younger than 180 ka, which are much more variable with three anomalies characterized by higher 143Nd/144Nd and lower 87Sr/86Sr values recognized. We interpret the three anomalies in the last 80 ka as recording episodes of eruptions from nearby volcanoes. Thus, it is likely that volcanism become more active in the last 80 ka. Excluding these anomalies, the average 143Nd/144Nd was generally lower, and average 87Sr/86Sr was higher in the post-180 ka section than in the older section, which might be associated with increased Australian continental aridity toward more recent time.
Keyword Dust provenance
Paleoclimate
Volcanic eruption
Geochemistry
Sr-Nd isotopes
Eastern Indian Ocean
Late Quaternary
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Earth Sciences Papers
Official 2016 Collection
 
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