title: Offshore sediments record the history of onshore iron ore mining in Goa State, India.
abstract: 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 41cm (1982CE). 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.
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, India. Electronic address: tsebastian@nio.org.
authors.forename: Tyson
authors.initials: T
authors.lastname: Sebastian
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, India.
authors.forename: B Nagender
authors.initials: BN
authors.lastname: Nath
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, India.
authors.forename: Sangeeta
authors.initials: S
authors.lastname: Naik
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, India.
authors.forename: D V
authors.initials: DV
authors.lastname: Borole
authors.affiliation: ENSIL-Ecole Nationale Supérieure d'Ingénieurs de Limoges, University of Limoges, France.
authors.forename: Salou
authors.initials: S
authors.lastname: Pierre
authors.affiliation: CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, India.
authors.forename: Armoury Kazip
authors.initials: AK
authors.lastname: Yazing
mesh_terms: D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000032:analysis*; D006802:Human Activities; D007194:India; D007501:Iron / Q000032:analysis*; D007856:Lead Radioisotopes / Q000032:analysis; D060328:Magnetic Phenomena; D008903:Minerals / Q000032:analysis; D008906:Mining / Q000379:methods; D055110:Radiometric Dating
chemical_list: D007856:Lead Radioisotopes; D008903:Minerals; D007501:Iron
keywords: (210)Pb dating; Anthropogenesis; Environmental magnetism; Iron ore mining; Sedimentation rate