The rock magnetic behavior og gravity core CSH1 from the northern Okinawa Trough and the effect of early diagenesis

GE Shu-lan; SHI Xue-fa; WU Yong-hua; LEE Teh-quei; XIONG Ying-qian; SAITO Yoshi

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Article Navigation > Haiyang Xuebao > 2005 > 27(6): 56-64

GE Shu-lan, SHI Xue-fa, WU Yong-hua, LEE Teh-quei, XIONG Ying-qian, SAITO Yoshi. The rock magnetic behavior og gravity core CSH1 from the northern Okinawa Trough and the effect of early diagenesis[J]. Haiyang Xuebao, 2005, 27(6): 56-64.

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The rock magnetic behavior og gravity core CSH1 from the northern Okinawa Trough and the effect of early diagenesis

1.
Marine Sedimentation and Environmental Geology Key Laboratory of State Oceanic Administration, Hangzhou 310012, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
Marine Sedimentation and Environmental Geology Key Laboratory of State Oceanic Administration, Hangzhou 310012, China
3.
Institute of Earth Sciences, Taipei, China
4.
Geology Survey of Japan, Tsukuba 306-8567, Japan

Received Date: 2005-03-22
Rev Recd Date: 2005-06-13

Abstract

Abstract

A detailed rock magnetic investigation was undertaken at 2~4 cm interval for the long core CSH1 (17.36 m) from the northern Okinawa T rough.A time scale of the core was constructed by two characteristic tephras and foraminferal assemblages,indicating an age of 50 ka for the bottom of the core.Except for three tephr as and abrupt decrease in surface,there are little changes in all kinds of rock magnetic parameters that can be correlated to the climate change for the last 50 ka.Being different from the common sediments,most of S value (S= -IRM_-0.3T/SIRM) for the sediments are smaller than 0.9,which implies substantial amount of magnetic minerals with high coercivity.Representative susceptibility-temperature (K-T) curves show 200~350℃ Curie temperature in addition to 580℃ of magnetite which reveals the existence of iron sulphide (greigite or pyrrhotite).This is also consistent with awful smell during heating and dark heating product which indicates the existence of iron sulphide.Both the occurrence of authigenic iron sulphide and quick decrease of magnetic parameters at the surface clearly show that sediments from Core CSH1 have undergone early diagenesis.The featureless magnetic changes of the whole core except for the three tephras mean that the postdepositonal alteration is so strong that most original signals have been destroyed.For the same reason,the organic matter in sediment and sulphate in pore water have been consumed,and iron,manganese dissolution and precipitation happen during the redox processes.Great caution must be taken when using these altered chemical parameters for the interpretation of climatic changes.
- northern Okinawa Trough,
- gravity core of CSH1,
- rock magnetic behavior,
- tephra sequences,
- early diagenesis

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References(37)

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