HEAVY MINERAL DISTRIBUTION AND MAGNETIC CHARACTERISTICS OF SURFACE SEDIMENTS IN THE NORTH BRANCH OF THE CHANGJIANG RIVER
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摘要: 分析了长江口北支表层沉积物的重矿物分布,结合磁参数和粒度特征,探讨其在各沉积动力分区的分布特点及控制因素。研究表明:研究区重矿物以角闪石和绿帘石组合为主,其次为云母类和磁铁矿等。其中浅滩和潮流脊处水动力较强,沉积物颗粒较粗,重矿物以片状矿物-稳定矿物组合占优势,磁性参数相对较低;汊道和潮汐通道处水动力相对较弱,沉积物以细颗粒的黏土质粉砂为主,重矿物以角闪石-黑色金属矿物-碳酸盐矿物为特征,磁性矿物多集中于此且含量较高,对应的磁学参数也呈现高值。北支的重矿物组合分布和磁性参数均与长江口其他区域具同源关系,表明北支表层沉积物主要来源于长江流域。总之,北支的重矿物组合分布和磁性特征受制于研究区的水动力强弱、沉积物类型、泥沙来源及搬运方式。Abstract: Based on data from the surface sediments obtained from the north branch of the Changjiang River, this paper deals with the distribution of heavy minerals, the spatial variations of sediment magnetic properties and their controlling factors. Results indicate that hornblende and epidote dominate in heavy minerals in the research area, followed by mica and magnetite, but mineral assemblages vary in different sedimentary dynamic zones. The mica-stable mineral assemblage mainly occurs in sandspits and tidal sands,where, under strong hydrodynamic conditions, coarse sediments prevail and magnetic parameters, such as Xarm、Xfd%、Xarm/Xl and Xarm/SIRM are relatively low. The assemblage of hornblende-magnetite-carbonate is mainly distributed in river channels and tidal inlets, where hydrodynamic condition is relatively low and fine sediments, such as clayey silt, dominate, and as the result, magnetic parameters of Xarm、Xfd%、Xarm/Xl and Xarm/SIRM are quite high. Data suggest that the sediments in the north branch of the Changjiang River are mainly from the Changjiang River drainage. The distribution of heavy minerals and magnetic parameters are controlled by hydrodynamics, sediment types, source rocks and sediment transportation.
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[1] 陈吉余, 王宝灿, 虞志英, 等. 中国海岸发育过程和演变规律[M]. 上海:上海科学技术出版社, 1998:1-17.[CHEN Jiyu, WANG Baocan, YU Zhiying, et al. Development and evolution of China's coast[M]. Shanghai:Shanghai Scientific and Technical Publishers, 1998:1
-17.]
[2] 孟翊, 程江. 长江口北支入海河段的衰退机制[J]. 海洋地质动态, 2005, 21(1):1-10.
[MENG Yi, CHENG Jiang. The atrophy of the estuarine north branch of the Yangzte River[J]. Marine Geology Letters, 2005, 21(1):1-10.]
[3] 张军宏, 孟翊. 长江口北支的形成和变迁[J]. 人民长江, 2009, 40(7):14-17.
[ZHANG Junhong, MENG Yi. Formation and channel evolution of north branch of Yangtze Estuarine[J]. Yangtze River, 2009, 40(7):14-17.]
[4] 徐海根. 关于长江口北支河槽演变中的几个问题[C]//海岸河口研究. 北京:海洋出版社, 1990:41-56.[XU Haigen. Some developmental aspects of the north branch of the Changjiang River[C]//Coastal and Estuarine Research. Beijing:China Ocean Press, 1990:41
-56.]
[5] 恽才兴. 长江河口近期演变基本规律[M]. 北京:海洋出版社, 2004:81-107.[YUN Caixing. Recent development of the Changjiang estuary[M]. Beijing:China Ocean Press, 2004:81
-107.]
[6] 贾海林, 刘苍字, 杨欧. 长江口北支沉积动力环境分析[J]. 华东师范大学学报:自然科学版, 2001(1):90-96.[JIA Hailin, LIU Cangzi, YANG Ou. Dynamic sediment environment of the north branch of Changjiang estuary[J]. Journal of East China Normal University(Natural Science), 2001
(1):90-96.]
[7] 刑云. 基于磁性特征的长江口和黄河口表层沉积物比较研究[D]. 华东师范大学, 河口海岸科学研究院, 2007.[XING Yun. Comparative studies on the magnetic properties of surface sediments from the Changjiang estuary and Huanghe estuary[D]. East China Normal University, Institute of Estuarine and Research, 2007.]
[8] 张卫国, 戴雪荣, 张福瑞, 等. 近7000年巢湖沉积物环境磁学特征及其只是的亚洲季风变化[J]. 第四纪研究, 2007, 27(6):1053-1062.
[ZHANG Weiguo, DAI Xuerong, ZHANG Furui, et al. Magnetic properties of sediments from the Chaohu lake for the last 7000 years and their implications for the evolution of Asian monsoon[J]. Quaternary Science, 2007, 27(6):1053-1062.]
[9] Tomspson R, Oldfield F. Environmental magnetism[M]. London:Allen&Uniwin, 1986:1-227.
[10] 刘红, 何青, 王元叶, 等. 长江口表层沉积物粒度时空分布特征[J]. 沉积学报, 2007, 25(3):445-455.
[LIU Hong, HE Qing, WANG Yuanye, et al. Temporal and spatial characteristics of surface sediment grain-size distribution in Changjiang River[J]. Acta Sedimentologica Sinica, 2007, 25(3):445-455.]
[11] 刘振夏, 夏东兴. 中国近海潮流沉积沙体[M]. 北京:海洋出版社, 2004:1-210.[LIU Zhenxia, XIA Dongxing. Tidal sands in the Chinese Seas[M]. Beijing:China Ocean Press, 2004:1
-210.]
[12] 王昆山, 王国庆, 蔡善武, 等. 长江水下三角洲沉积物的重矿物分布与组合[J]. 海洋地质与第四纪地质, 2007, 27(1):7-12.
[WANG Kunshan, WANG Guoqing, CAI Shanwu, et al. Heavy mineral characteristics of surface sediments in the subaqueous Yangtze River delta[J]. Marine Geology and Quaternary Geology, 2007, 27(1):7-12.]
[13] 杨守业, 李从先, 朱金初, 等. 长江与黄河沉积物中磁铁矿成分标型意义[J]. 地球化学, 2000, 29(5):480-484.
[YANG Shouye, LI Congxian, ZHU Jinchu, et al. Provenance indicator of chemical fingerprint of magnetite from the Yangtze River and the Yellow River sediments[J]. Geochimica, 2000, 29(5):480-484.]
[14] 孙白云. 长江、黄河和珠江三角洲沉积物中碎屑矿物的组合特征[J]. 海洋地质与第四纪地质, 1990, 10(3):23-34.
[SUN Baiyun. Detrital mineral assemblages in the Huanghe,Changjiang and Zhujiang River delta sediments[J]. Marine Geology and Quaternary Geology, 1990, 10(3):23-34.]
[15] 王中波, 杨守业, 李萍, 等. 长江水系沉积物碎屑矿物组成及其示踪意义[J]. 沉积学报, 2006, 24(4):570-578.
[WANG Zhongbo, YANG Shouye, Li Ping. Detrital mineral compositions of the Changjiang River sediments and their tracing implications[J]. Acta Sedimentologica Sinica, 2006, 24(4):570-578.]
[16] ZHANG Wei-guo, XING Yun, YU Li-zhong, et al. Distinguishing sediments from the Yangtze and Yellow Rivers, China:a mineral magnetic approach[J]. The Holocene, 2008, 18(7):1139-1145.
[17] 刑云, 张卫国, 杨世伦, 等. 潮滩表层沉积物磁性特征的季节变化及其对沉积动力的响应-以杭州湾北岸为例[J]. 沉积学报, 2007, 2:267-273.[XING Yu, ZHANG Weiguo,YANG Shilun, et al. Seasonal changes in magnetic properties of surficial tidial flat sediment and their response to sedimentation dynamics:a case from the coast of the Hangzhou Bay[J]. Acta Sedimentologica Sinica, 2007
, 2:267-273.]
[18] 刘健, 秦华峰, 孔祥淮, 等. 黄东海陆架及朝鲜海峡泥质沉积物的磁学特征比较研究[J].第四纪研究, 2007, 27(6):1031-1039.
[LIU Jian, QIN Huafeng, KONG Xianghuai, et al. Comparative researches on the magnetic properties of muddy sediments from the Yellow Sea and East China Sea sediments and the Korea Strait[J]. Quaternary Science, 2007, 27(6):1031-1039.]
[19] 张卫国, 俞立中, 许羽. 环境磁学研究的简介[J]. 地球物理进展, 1995, 10(3):95-105.
[ZHANG Weiguo, YU Lizhong, XU Yu. Brief reviews on environmental magnetism[J]. Progress in Geophysics,1995,10(3):95-105.]
[20] 金翔龙. 东海海洋地质[M]. 北京:科学出版社, 1992:144-174.[JIN Xiang-long. Marine Geology of the East China Sea[M]. Beijng:Science Press, 1992:144
-174.]
[21] 林晓彤, 李巍然, 时振波. 黄河物源碎屑沉积物的重矿物特征[J]. 海洋地质与第四纪地质, 2003, 23(3):17-21.
[LIN Xiaotong, LI Weiran, SHI Zhenbo. Characteristics of mineralogy in the clastic sediments from the Yellow River provenance, China[J]. Marine Geology and Quaternary Geology, 2003, 23(3):17-21.]
[22] 袁迎如, 陈庆. 古黄河三角洲的发育和侵蚀[J]. 科学通报, 1983, 21:1322-1324.[YUAN Yingru, CHEN Qin. The development and erosion of ancient Yellow River Delta[J]. Chinese Science Bulletm, 1983
, 21:1322-1324.]
[23] 虞志英, 陈昌德, 金镠. 江苏北部旧黄河水下三角洲的形成及其侵蚀改造[J]. 海洋学报, 1986, 8(2):1997-206.
[YU Zhiying, CHEN Changde, JIN Liu. The formation and erosion rebuild of the old Yellow River estuary delta in northern Jiangsu Province.Acta Oceanalogica Sinica, 1986, 8(2):1997-206.]
[24] 恽才兴, 蔡孟裔, 王宝全. 利用卫星象片分析长江入海泥沙扩散问题[J]. 海洋与湖沼, 1981, 12(5):391-401.
[YUN Caixing, CAI Mengyi, WANG Baoquan. An analysis of the diffusion of suspended sediment discharge from the Changjiang river based on the satellite images[J]. Oceanologia et Limnologia Sinica, 1981,12(5):391-401.]
[25] 史立人, 魏特, 沈蕙漱. 长江入海泥沙扩散与北支淤积泥沙来源[J]. 长江水利水电科学研究院院报, 1985, 2:12-25.[SHI Liren, WEI Te, SHEN Huishu. The Diffusion of Seaward Sediments from Yangtze River and the sources of Depositing Sediments in the North Branch[J]. Journal of Yangtze River Scientific Research Insitute, 1985
, 2:12-25.]
[26] 杨欧, 刘苍字. 长江口北支粒径趋势及泥沙来源研究[J]. 水利学报, 2002, 2:79-84.[YANG Ou, LIU Cangzi. Analysis on sediment transport patterns and sediments source of north branch of Changjiang River[J]. Journal of Hydraulic Engineering, 2002
, 2:79-84.]
[27] 周开胜, 孟翊, 刘苍字, 等. 长江口北支潮流沙体沉积物来源分析[J]. 海南师范大学:自然科学版, 2007, 20(3):277-282.
[ZHOU Kaisheng, MENG Yi, LIU Cangzi, et al. Source of the tidal sands along the norther branch of Changjiang river,Journal of Hainan Normal University(Natural Science), 2007, 20(3):277-282.]
[28] 王永红, 沈焕庭, 张卫国. 长江口与黄河口沉积物磁性特征对比的初步研究[J]. 沉积学报, 2004, 22(4):658-663.
[WANG Yonghong, SHEN Huanting, ZHANG Weiguo. A preliminary comparison of magnetic properties of sediments from the Changjiang and the Huanghe estuaries[J]. Acta Sedimentologica Sinica, 2004, 22(4):658-663.]
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