Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Stratigraphy of a Sediment Core Collected from the NE Equatorial Pacific Using Reversal Patterns of Geomagnetic Field and Be Isotope Ratio

지자기 방향변화 및 베릴륨 동위원소비를 이용한 북동 적도 태평양 주상시료의 층서확립

  • Kim, Wonnyon (Deep-sea and Seabed Mineral Resources Research Center, KIOST) ;
  • Hyeong, Kiseong (Deep-sea and Seabed Mineral Resources Research Center, KIOST) ;
  • Kong, Gee Soo (Petroleum and Marine Research Division, KIGAM)
  • 김원년 (한국해양과학기술원 심해저광물자원연구센터) ;
  • 형기성 (한국해양과학기술원 심해저광물자원연구센터) ;
  • 공기수 (한국지질자원연구원 석유해저연구본부)
  • Received : 2014.10.06
  • Accepted : 2014.11.21
  • Published : 2014.12.30
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Abstract

A 570 cm-long sediment core was retrieved at $9^{\circ}57^{\prime}N$ and $131^{\circ}42^{\prime}W$ in 5,080 m water depth from the northeast equatorial Pacific and its stratigraphy was established with $^{10}Be/^9Be$ and paleomagnetic measurements. Successive AF demagnetization reveals eight geomagnetic field reversals. In the reference geologic time scale, the eight reversal events correspond to an age of about 4.5 Ma. However, $^{10}Be/^9Be$-based age yields 9.5 Ma at a depth of 372 cm. Such a large discrepancy in determined ages is attributed to an extremely low sedimentation rate, 0.4 mm/kyr on average, of the study core and resultant loss or smoothing of geomagnetic fields. The composite age model reveals a wide range in the sedimentation rate - varying from 0.1 to 2.4 mm/kyr. However, the sedimentation rate shows systematic variation depending on sedimentary facies (Unit II and III), which suggests that each lithologic unit has a unique provenance and transport mechanism. At depths of 110-80 cm with a sedimentation rate of about 0.1 mm/kyr, ancient geomagnetic field reversal events of at least a 1.8 Myr time span have not been recorded, which indicates the probable existence of a hiatus in the interval. Such a sedimentary hiatus is observed widely in the deep-sea sediments of the NE equatorial Pacific.

Keywords

References

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