Analytical geochemistry
; Geochemistry
; Iron
; Lead
; Magnetic susceptibility
; Magnetism
; Minerals
; Ores
; Sedimentation
; Sediments
; Underwater mineralogy
; <sup>210</sup>Pb dating
; Anthropogenesis
; Environmental magnetism
; Iron-ore mining
; Sedimentation rates
; Iron ores
; calcium carbonate
; iron
; lead 210
; mineral
; organic carbon
; trace element
; iron
; lead
; mineral
; dating method
; geomagnetism
; iron ore
; lead isotope
; Little Ice Age
; magnetic susceptibility
; mining
; sediment chemistry
; sediment core
; sedimentation rate
; Article
; concentration (parameters)
; continental shelf
; geochemical analysis
; India
; magnetism
; mining
; particle size
; radiometric dating
; sediment
; sedimentation rate
; analysis
; environmental monitoring
; human activities
; procedures
; sediment
; Arabian Sea
; Goa
; India
; Indian Ocean
; Environmental Monitoring
; Geologic Sediments
; Human Activities
; India
; Iron
; Lead Radioisotopes
; Magnetic Phenomena
; Minerals
; Mining
; Radiometric Dating
Scopus学科分类:
Agricultural and Biological Sciences: Aquatic Science
; Earth and Planetary Sciences: Oceanography
; Environmental Science: Pollution
英文摘要:
Environmental magnetic and geochemical analyses combined with210Pb 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 (LIA) climatic events of Dalton and Maunder solar minima. � 2016 Elsevier Ltd
CSIR-National Institute of Oceanography, Dona Paula, Goa, India; ENSIL—Ecole Nationale Sup�rieure d'Ing�nieurs de Limoges, University of Limoges, France
Recommended Citation:
Sebastian T.,Nath B.N.,Naik S.,et al. Offshore sediments record the history of onshore iron ore mining in Goa State, India[J]. Marine Pollution Bulletin,2017-01-01,114(2)