Diagenetic Alteration on Magnetic Mineralsand the Paleoclimate Implications, Results from Core YD0901 of Yangtze Subaqueous Delta
详细信息
- 责任者：Zheng Yan (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Zheng Hongbo
- 刊名：Quaternary Sciences
- 出版年：2012
- 卷期：32(4)
- 关键词：河流沉积物 ; stream sediments ; 岩石磁学 ; rock magnetism ; 古气候 ; paleoclimate ; 长江口 ; Yangtze River Mouth
- 页码：p.655-662
- 图表：3 illus., 45 refs.
- 分类号：1400
- issnNo：ISSN1001-7410
- isbnNo：CN11-2708/P
摘要
High-resolution magnetic analysis was carried out on U-channel samples from core YD0901(31°11’N,122°30’E;21 m water depth;65.23 m in length),which was drilled from the Yangtze subaqueous delta.In this paper,the authors mainly discuss the magnetic variations of the uppermost 34.22 m mud section part( < 10 μm grains are more than 60% and >63 μm grains are less than 2% in volume),with some missing intervals during coring,2.53～2.82 m,3.59～3.92 m,4.93～5.94 m,18.37～21.15 m and 21.85～22.20 m.Section Ⅰ(0～8 m) is characterized by high magnetic concentration,which contains magnetite,hematite and some iron sulfide.Section Ⅱ(8.0～34.2 m) is characterized by low magnetic concentration,which contains multidomain magnetite,hematite and iron sulfide.Variation of magnetic coercivity in the sediments has significant power at the periods of 800 years and 220 years.
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