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Studies　on　sedimentary　events　in　Mariana　Trough　and　characteristics　of　geomagnetic　field　change

Acta Oceanologica Sinica 1996年第4期15卷 457-468页

作者： Cong Youzi Han Guozhong Cheng Guoliang Sun Yuhang Wei Qingyun and Jiang Li First Institute of Oceanography State Oceanic Administration Qingdao 266003 China Institute of Geology State Seismological Bureau Beijing 100029 China Institute of Geophysics Academia Sinica Beijing 100101 China

The analysis on the magnetic fabric of profile of the sedimentary core taken in five stations in the small spreading ridge area in Mariana Trough shows that the effect of indicating its depositional fabric, sedimentary *** events, sedimentary interfaces and sediment composition as well as sedimentary dynamic environment by magnetic. Parameters is clearer than that by traditional method of analysis. The indication of sedimentary events can show its high resolution. The study on the Late Quaternary sedimentary events in this area shows that this area underwent four big events of sudden change in the Holocene epoch based on the sudden change of underflow direction and the position relationship between ash beds and erosion sediment layers. The sudden change of underflow direction is a believable evidence for judgement and study of sudden event within this area. The direction changes of its geomagnetic field show three morphotypes i. e. relatively stable type and non-stable type of oscillatory amplitude of magnetic inclination (Inc) which existed during the relatively stable period of amplitude of magnetic declination (Dnc). Anothertype is characterized by big amplitude of both inclination and *** space-time series of the three type mentioned above is a new way for forming a high-resolution stratigraphical timetable.

关键词： alimentary magnetic fabric underflow direction sedimentary events geomagnetic field direction

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