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LI Jun, GAO Shu, SUN You-bin, ZENG Zhi-gang. Grain-size Variations of Terrigenous Sediment Sequences in the South Okinawa Trough[J]. Acta Sedimentologica Sinica, 2003, 21(3): 461-466.
Citation: LI Jun, GAO Shu, SUN You-bin, ZENG Zhi-gang. Grain-size Variations of Terrigenous Sediment Sequences in the South Okinawa Trough[J]. Acta Sedimentologica Sinica, 2003, 21(3): 461-466.

Grain-size Variations of Terrigenous Sediment Sequences in the South Okinawa Trough

  • Received Date: 2002-06-05
  • Rev Recd Date: 2002-11-29
  • Publish Date: 2003-09-10
  • Terrigenous detritus samples extracted from a piston core A23, located in the so uthern Okinawa Trough, were analyzed in terms of the grain-size characteristics. The results show that the terrigenous sequences in the core can be divided int o two parts on the basis of the variations in the grain-size parameters. The l ower sequence is characterized by constant grain-size parameters; whilst the up per part is controlled by turbidite layers with a thickness of about 2~20 cm, which caused very large variations of the parameters. The large variation of gra in-size composition and distribution of the turbidite sequences significantly disturbed the normal formation of the sediment sequences. The gain-size distri bution modes and parameters of a turbidite bed were analyzed in detail, which sh ow very regular variation in the bed. According to all grain-size character istics of the core, the depositional environment and sediment dynamics is very c omplex and the main mechanism of the transportation of the terrigenous material from East China Sea Shelf to the trough is in the form of bedload through canyo ns. Furthermore, pretreatment to the marine sediments is important, which enable s us to compare the grain-size characteristics between terrigenous detritus and the bulk grain-size.
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  • Received:  2002-06-05
  • Revised:  2002-11-29
  • Published:  2003-09-10

Grain-size Variations of Terrigenous Sediment Sequences in the South Okinawa Trough

Abstract: Terrigenous detritus samples extracted from a piston core A23, located in the so uthern Okinawa Trough, were analyzed in terms of the grain-size characteristics. The results show that the terrigenous sequences in the core can be divided int o two parts on the basis of the variations in the grain-size parameters. The l ower sequence is characterized by constant grain-size parameters; whilst the up per part is controlled by turbidite layers with a thickness of about 2~20 cm, which caused very large variations of the parameters. The large variation of gra in-size composition and distribution of the turbidite sequences significantly disturbed the normal formation of the sediment sequences. The gain-size distri bution modes and parameters of a turbidite bed were analyzed in detail, which sh ow very regular variation in the bed. According to all grain-size character istics of the core, the depositional environment and sediment dynamics is very c omplex and the main mechanism of the transportation of the terrigenous material from East China Sea Shelf to the trough is in the form of bedload through canyo ns. Furthermore, pretreatment to the marine sediments is important, which enable s us to compare the grain-size characteristics between terrigenous detritus and the bulk grain-size.

LI Jun, GAO Shu, SUN You-bin, ZENG Zhi-gang. Grain-size Variations of Terrigenous Sediment Sequences in the South Okinawa Trough[J]. Acta Sedimentologica Sinica, 2003, 21(3): 461-466.
Citation: LI Jun, GAO Shu, SUN You-bin, ZENG Zhi-gang. Grain-size Variations of Terrigenous Sediment Sequences in the South Okinawa Trough[J]. Acta Sedimentologica Sinica, 2003, 21(3): 461-466.
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