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Titolo:
DISTRIBUTIONS OF TRANSITION-ELEMENTS IN THE SURFACE SEDIMENTS OF THE YELLOW-SEA
Autore:
KIM GB; YANG HS; KODAMA Y;
Indirizzi:
UNIV DELAWARE,COLL MARINE STUDIES NEWARK DE 19716 BUKYONG NATL UNIV,COLL MARINE SCI & TECHNOL,NAM GU PUSAN 608737 SOUTHKOREA UNIV TOKYO,OCEAN RES INST,NAKANO KU TOKYO 164 JAPAN
Titolo Testata:
Continental shelf research
fascicolo: 12, volume: 18, anno: 1998,
pagine: 1531 - 1542
SICI:
0278-4343(1998)18:12<1531:DOTITS>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTINENTAL-SHELF; CHEMICAL-ELEMENTS; TRACE-METALS; RIVER; CHINA; ABUNDANCE;
Keywords:
YELLOW SEA; SEDIMENT; METAL; TRANSITION ELEMENT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
G.B. Kim et al., "DISTRIBUTIONS OF TRANSITION-ELEMENTS IN THE SURFACE SEDIMENTS OF THE YELLOW-SEA", Continental shelf research, 18(12), 1998, pp. 1531-1542

Abstract

We report the distributions of transition elements in the surface sediments of the Yellow Sea including the coastal areas of both Korea andChina. The maximum concentrations of LOI (loss on ignition), Al, and transition elements (Ti, V, Cr, Fe, Co, Ni, Zn and Cu), except Mn, arefound in the central Yellow Sea where clay minerals predominate. A good positive correlation between silt plus clay contents and most of the transition elements (Ti, V, Cr, Fe, Co, Ni, Zn, and Cu, r =0.72-0.91) suggests that the distribution patterns of these elements are strongly controlled by quartz dilution. The distribution pattern of Mn is opposite to the other transition elements, displaying the maximum concentrations in the shallower regions where coarse sediments predominate. Higher Mn enrichment factors (max. EF: 3.0) and higher Mn/Fe ratios inthe coastal sandy regions (relative to those in the other study areasand in suspended matter of the source rivers) suggest the presence ofauthigenic Mn by forming an oxidizing condition due to higher porosity but lower organic contents. In contrast, relatively lower Mn/Al ratios and lower enrichment factors (mean EF: 0.7) are observed in the central Yellow Sea where maximum organic contents are present. This suggests that the dissolutions of Mn oxides take place in the central Yellow Sea sediments by oxygen reduction during decomposition of organic matters. (C) 1998 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 08:07:30