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The magnetic properties of sediment and sedimentary environment in the Huanghe Delta area after the last glacial maximum

The magnetic properties of sediment and sedimentary environment in the Huanghe Delta area after the last glacial maximum

作     者:PENG Jun LI Ping CHEN Hongquan 

作者机构:School of Urban and PlanningYancheng Teacher's University First Institute of OceanographyState Oceanic Administration 

出 版 物:《Acta Oceanologica Sinica》 (海洋学报(英文版))

年 卷 期:2016年第35卷第5期

页      面:113-123页

核心收录:

学科分类:0709[理学-地质学] 081803[工学-地质工程] 0809[工学-电子科学与技术(可授工学、理学学位)] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0818[工学-地质资源与地质工程] 0805[工学-材料科学与工程(可授工学、理学学位)] 080502[工学-材料学] 0702[理学-物理学] 

基  金:The National Natural Science Foundation of China under contract Nos 41306077 and 41501567 the Major Program of University Natural Science Foundation of Jiangsu Province of China under contract No.14KJA170006 the Natural Science Foundation of Shandong Province of China under contract No.ZR2013DQ025 

主  题:the Huanghe(Yellow River) Delta magnetic properties sedimentary environment grain size dating 

摘      要:On the basis of measuring the magnetic parameters of sediment in Core YDZ1, combined with a grain size analysis and Carbon-14 dating, the magnetic properties of sediment and sedimentary environment in the Huanghe(Yellow River) Delta area after the last glacial maximum have been studied. The results show that the ferrimagnetic minerals of a pseudo single domain and multi domain particles dominate the magnetic properties of sediment in Core YDZ1. The imperfect anti ferrimagnetic minerals have more contribution on sediment in a depth of 24.0–22.1 m, and more stable-single domain and pseudo single domain particles exist. The susceptibility of anhysteretic remanent magnetization and the ratio of the susceptibility of anhysteretic remanent magnetization to saturation isothermal remanent magnetization show a decrease trend below depth of 24 m, a marked increase trend in a depth of 24.0–13.5 m, and a rapid decrease at depth of 13.5 m, then a fluctuation trend upward. The above two magnetic parameters and the ratio of the susceptibility of anhysteretic remanent magnetization to the mass susceptibility can be regarded as the proxy indicators for the content of clay(〈4 μm)and the fine-grained size(〈32 μm). The sedimentary environment after the last glacial maximum in the Huanghe Delta area has experienced the fluvial facies, the tidal flat facies, the neritic facies, the pro delta facies, the delta front facies and the floodplain facies. Thickness of the Holocene transgression layer is 10.5 m and the depth of substrate is about 24 m according to the YDZ1 core. The sedimentary dynamic has a variation trend with strongweak-strong, which has been proved by the Flemming triangular schema.

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