Paleomagnetic records and mineral-magnetic properties of deep-sea sediments in the NW pacific: Paleoenvironmental implication

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• 作者：Cheong Kee Park (1)
  Wonnyon Kim (1)
  Youngtak Ko (1)
  Hyun-Bok Lee (1)
  Jai-Woon Moon (1)
  Seong-Jae Doh (2)
  
• 关键词：magnetostratigraphy ; mineral ; magnetic properties ; paleoenvironment ; Korea deep ; sea research program
• 刊名：Ocean Science Journal
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：47
• 期：4
• 页码：497-508
• 全文大小：2053KB
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• 作者单位：Cheong Kee Park (1)
  Wonnyon Kim (1)
  Youngtak Ko (1)
  Hyun-Bok Lee (1)
  Jai-Woon Moon (1)
  Seong-Jae Doh (2)
  
  1. Deep-sea and Seabed Resources Research Division, KIOST, Ansan, 426-744, Korea
  2. Department of Earth and Environmental Sciences, College of Science, Korea University, Seoul, 136-701, Korea
  
• ISSN：2005-7172

文摘

The paleomagnetic records and mineral-magnetic properties of unconsolidated core sediment from the east Mariana Basin of the western Pacific have been analyzed to trace the time-dependent variations in sedimentary environments. Progressive alternating field demagnetization effectively extracts a stable remanent magnetization showing both normal and reverse polarities. Comparison of successive polarity changes, recorded in the sediment core, with reference magnetic polarity time-scale, reveals that the recovered sediment column was deposited since the late Pliocene. From the sediment age model, calculated sedimentation rate during the late Pliocene was 9.8 times higher than that during the Pleistocene. Considering the oceanic environments and geologic setting in the study area, the anomalous high sediment flux during the late Pliocene was probably caused by enhanced current flows, such as North Equatorial Current, associated with atmospheric circulation as well as by debris flows from adjacent sea mounts. In addition, the systematic variation of mineral-magnetic properties indicates periodical fluxes of coarse and magnetically stable particles, on the fine-grained dominant sedimentary environments. Such influxes, however, would not be related to syn-volcanic activities, because the summits of seamounts were totally blanketed by biogenic Pliocene-Pleistocene sediments. It is, hence, reasonable to interpret that paleomagnetic and mineral-magnetic data probably reflect drastic paleoenvironmental changes at the boundary between the Pliocene and Pleistocene, where strong current and atmospheric circulations decreased.