Elemental geochemical records of modern seafloor hydrothermal activities in sediments from the central Okinawa Trough

ZHAI Shi-kui; YU Zeng-hui; DU Tong-jun

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ZHAI Shi-kui, YU Zeng-hui, DU Tong-jun. Elemental geochemical records of modern seafloor hydrothermal activities in sediments from the central Okinawa Trough[J]. Haiyang Xuebao, 2007, 29(1): 58-65.

Citation:

ZHAI Shi-kui, YU Zeng-hui, DU Tong-jun. Elemental geochemical records of modern seafloor hydrothermal activities in sediments from the central Okinawa Trough[J]. Haiyang Xuebao, 2007, 29(1): 58-65.

ZHAI Shi-kui, YU Zeng-hui, DU Tong-jun. Elemental geochemical records of modern seafloor hydrothermal activities in sediments from the central Okinawa Trough[J]. Haiyang Xuebao, 2007, 29(1): 58-65.

Citation:

ZHAI Shi-kui, YU Zeng-hui, DU Tong-jun. Elemental geochemical records of modern seafloor hydrothermal activities in sediments from the central Okinawa Trough[J]. Haiyang Xuebao, 2007, 29(1): 58-65.

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Elemental geochemical records of modern seafloor hydrothermal activities in sediments from the central Okinawa Trough

College of Marine Geosciences.Ocean University of China. Oingdao 266003, China

Received Date: 2006-05-05
Rev Recd Date: 2006-07-26

Abstract

Abstract

Major and minor element contents in the sediment core H 9 from the hydrothermal fields of the central Okinawa.Trough show a sharp change at the depth of 80 cm.The elements enriched in the upper 80 cm core are those enriched in the hydrothermal deposits and in the surface sediments recovered from the hydrothermal fields in the trough, which indicates the input of hydro thermal materials.Comparing with other hydrothermal sediments from Midocean Ridges or the LauBasin, the degree of the enrichment of elements firon, copper, cobalt and nickel is relatively low.However, the enrichment of elements manganese, lead, arsenic, stibium and mercury is remarkable.The average contents of these elements in the upper 80 cm core sediments are 3~6 times of those in the lower section, and 3~12 times of those in the surface sediments which are not influenced by the hydrothermal activities.The hydrot hermal activities have contributed significant manganese, lead, arsenic, stibium and mercury to the sediments, and these elements are distinct indicators for the hydrothermal activities in the Okinawa Trough.The significant enrichment of these elements in Core H9 upward from the depth 80 cm indicates the start or the significanten hancing of the hydrothermal activities in this area at about 5 740 a BP.The average accumulation rate of mang anese during this period is about 40.461 µg/(cm²·ka), which is similar to the hydrothermal sediments in the Lau Basin or the East Pacific Rise.
- Okinawa Trough,
- hydrothermal activity,
- elemental geochemical record,

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References(39)

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