Magnetostratigraphy of Borehole EY02—1 in the northern outer continental shelf of the East China Sea

GE Shu-lan; SHI Xue-fa; WU Yong-hua; XIONG Ying-qian; HAN Yi-bing; TANG Bao-gen

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Article Navigation > Haiyang Xuebao > 2008 > 30(2): 51-61

GE Shu-lan, SHI Xue-fa, WU Yong-hua, XIONG Ying-qian, HAN Yi-bing, TANG Bao-gen. Magnetostratigraphy of Borehole EY02—1 in the northern outer continental shelf of the East China Sea[J]. Haiyang Xuebao, 2008, 30(2): 51-61.

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Magnetostratigraphy of Borehole EY02—1 in the northern outer continental shelf of the East China Sea

1.
Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
3.
First Marine Geological Investigation Team, Shanghai Offshore Petroleum Bureau, Shanghai 201208, China

Received Date: 2006-11-29
Rev Recd Date: 2007-08-31

Abstract

Abstract

Rock magnetic and paleo magnetic study is under taken for the 70.20 m borehole in the East China Sea(ECS),showing that the mainmagnetic carrier is low coercivity magnetite.Magnetostratigraphy in this borehole reveals excursion at 9.62~8.58 m that is proved to be Gothenburg excursion at the beginning of Holocene with the linearly extrapolated calendarage o f 12 681~10 206 a BP from AMS ¹⁴C dating,which provides a new evidence for the aut henticity of this excursion.The stratigraphic sequences are determined for the Late Pleisto cenebased on high-resolution subbottom seismic profiles and boreholes(typical seismic profiles and boreholes in the ECS)and two rever sals are indicated.One is from 54.00 to 50.94 m with a shallow ornegative inclination,which may be an Iceland Basin event,but this is not fully discussed because of coarse sediment(which is considered as an unreliable recorder of reversal)and discontinuo us negative sample inclinations.The second continuous negative section occurs at the bottom from 70.20 to 64.31 m. Althought here is seismic profile penetrating int othe Middle Pleist ocene sequence,real boreholes reaching such long time are absent.So the bottomage is deduced according to the seismic correlation,the cycles of transg ression and regression and the time span of rever sals occurring in the Brunhes chron.The sediments of the bottom reversal are mainly coarse silty sand and fine sand,and also the length of the borehole is calculated to cross the layers of the chaotic seismic phase of MIS6 and parallel stratigraphies of marine phase underneath,so it is concluded that the bottom reversal is CR0(265~255 ka BP)happened at late MIS8.
- northern outer continental shelf of East China Sea,
- Borehole EY02-1,
- magnetostratigraphy,
- Gothenburg flip,
- CR0 reversal event

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References(36)

References

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