期刊
MARINE POLLUTION BULLETIN
卷 114, 期 2, 页码 805-815出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2016.10.075
关键词
Environmental magnetism; Iron ore mining; Sedimentation rate; Pb-210 dating; Anthropogenesis
资金
- CSIR-Shyama Prasad Mukherjee Fellowship (SPMF)
- CSIR XII Plan GEOSINKS project [PSC0106]
Environmental magnetic and geochemical analyses combined with Pb-210 dating were carried out on a sediment core off Goa from Arabian Sea to reconstruct the sedimentation history of last three and a half centuries and to investigate the impact of onshore iron ore mining on the offshore sedimentation. A drastic increase in sedimentation rate and mineral magnetic concentration parameters divides the core into two units (1 & 2) at a depth of 41 cm (1982 CE). The high magnetic susceptibility values in Unit 1 sediments are coeval with increased iron ore production on land and illustrate the role of terrestrial mining on the increased offshore sedimentation. The early diagenetic signals were observed in Unit 2 of the core with low concentration parameters, coarse magnetic grain size and magnetically hard mineralogy. The geochemical data of the core also record the Little Ice Age (HA) climatic events of Dalton and Maunder solar minima. (C) 2016 Elsevier Ltd. All rights
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