| 大连湾近海表层沉积物矿物组合分布特征及其物源环境 |
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| 引用本文： | 李艳,李安春,万世明,徐方建,李传顺,池野.大连湾近海表层沉积物矿物组合分布特征及其物源环境[J].海洋地质与第四纪地质,2009(4). |
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| 作者姓名： | 李艳 李安春 万世明 徐方建 李传顺 池野 |
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| 作者单位： | 中国科学院海洋研究所海洋地质与环境重点实验室;中国科学院研究生院; |
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| 基金项目： | 国家908专项(908-01-CJ03);;近海海洋综合调查与评价项目 |
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| 摘 要： | 对大连湾、大窑湾外近海表层沉积物进行了黏土矿物X射线衍射分析以及轻矿物的分离和鉴定,根据其组合分布特征,探讨了该区沉积物中黏土矿物和轻矿物的来源,并对沉积环境及其主控因素进行了初步分析。结果表明:研究区黏土矿物主要由伊利石(59%)、蒙皂石(20%)、绿泥石(16%)和高岭石(5%)组成,研究区西部伊利石较高,而东部绿泥石较高,蒙皂石有向湾内富集的趋势。轻矿物由斜长石(45%)、石英(34%)、钾长石(10%)、绿泥石(8%)、白云母(2%)和方解石(0.4%)组成,呈东西向条带状分布,与沉积物粒度分布特征较为一致。矿物分布受潮流、地形影响明显,研究区北部近岸水下岸坡区,水动力条件较强,沉积物粒度较粗,矿物组合以长石、石英富集为特征;向南水深增加,东部为一水下台地,矿物组合以白云母、绿泥石含量高为特征;研究区南部水深增加,又出现一水下岸坡,其下地形趋于平坦,因受出入渤海的潮流和进入渤海的黄海暖流的影响,水动力条件最强,沉积物粒度较粗,长石含量最高,轻矿物含量高。研究区潮流、地形对矿物组成、组合和含量具有控制作用。北部水下岸坡及以内近岸浅水区沉积物粒度较粗,轻矿物含量低,石英、长石含量高,物质主要来自沿岸侵蚀及...
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| 关 键 词： | 黏土矿物 轻矿物 物质来源 沉积环境 大连湾 |
DISTRIBUTION OF MINERAL ASSEMBLAGES IN OFFSHORE SURFACE SEDIMENTS OF DALIAN BAY IN THE NORTHWESTERN NORTH YELLOW SEA AND THEIR PROVENANCE AND ENVIRONMENTAL IMPLICATIONS |
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| LI Yan,LI Anchun,WAN Shiming,XU Fangjian,LI Chuanshun,CHI Ye.DISTRIBUTION OF MINERAL ASSEMBLAGES IN OFFSHORE SURFACE SEDIMENTS OF DALIAN BAY IN THE NORTHWESTERN NORTH YELLOW SEA AND THEIR PROVENANCE AND ENVIRONMENTAL IMPLICATIONS[J].Marine Geology & Quaternary Geology,2009(4). |
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| Authors: | LI Yan LI Anchun WAN Shiming XU Fangjian LI Chuanshun CHI Ye |
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| Institution: | 1 Key Laboratory of Marine Geology and Environment;Institute of Oceanology;Chinese Academy of Sciences;Qingdao 266071;China;2 Graduate University of Chinese Academy of Sciences;Beijing 100049;China |
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| Abstract: | Based on X-ray diffraction analysis of clay mineral compositions in the offshore surface sediments of Dalian Bay and Dayao Bay,together with separation and identification on light minerals,the assemblages and distribution characteristics of these minerals were studied.Their sources and sedimentary environments were discussed.Four kinds of clay minerals(illite,smectite,chlorite and kaolinite) are identified,whose average contents are 59%,20%,16% and 5%,respectively.Illite is abundant in the west part of the ... |
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| Keywords: | clay and light minerals provenance and environmental implication Dalian Bay |
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