极地研究

极地研究

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北冰洋西部表层沉积物矿物学特征及其物质来源

董林森 石学法 刘焱光 方习生 陈志华 王春娟 邹建军 黄元辉   

  1. 国家海洋局第一海洋研究所 海洋沉积与环境地质国家海洋局重点实验室，山东青岛266061
  • 出版日期:2014-03-30 发布日期:2014-03-30

MINERALS IN SURFACE SEDIMENTS IN THE WESTERN ARCTIC OCEAN AND THEIR SOUCES

Dong Linsen1,2，Shi Xuefa1,2，Liu Yanguang1,2，Fang Xisheng1,2，Chen Zhihua1,2，Wang chunjuan1,2，Zou jianjun1,2, Huang Yuanhui1,2   

  1.  
    1 First Institute of Oceanography, SOA, Qingdao 266061, China;
    2 Key Laboratory of Marine Sedimentology and Environmental Geology, SOA, Qingdao 266061, China
  • Online:2014-03-30 Published:2014-03-30

PDF (PC)

1668

被引次数

5

摘要： 对北冰洋西部79个表层沉积物样品进行了全岩X射线衍射矿物组成分析，结合洋流和地质背景，探讨各矿物分区的物质来源。矿物组合分区表明研究区物质来源变化较为复杂：（1）在楚科奇海的中部靠近白令海峡处长石含量很高，这主要是阿纳德尔流携带的来自阿纳德尔河的沉积物，在楚科奇海的西侧的长石含量也较高，且与其他矿物组合分区相比，角闪石含量较高，这是因为受阿纳德尔流和东西伯利亚沿岸流的双重影响，沉积物来自西伯利亚陆地的高含长石的一些火山岩及沉积岩等。在楚科奇海的东侧，石英含量很高，来源为阿拉斯加沿岸流携带的育空河及卡斯奎姆河的沉积物。在阿拉斯加北部，碳酸盐岩和石英含量高，这与马更些河搬运的沉积物有关。（2）北冰洋西部深水区中加拿大海盆的南端和中部方解石和白云石的含量较低，说明受波弗特环流携带的加拿大北极群岛的碳酸盐影响相对较小，且与其他矿物组合分区相比，云母含量最高，说明沉积物主要来源为来自拉普捷夫海的海冰沉积物，此外一些粘土级细粒物质可能由大西洋中层水携带而来。深水区的其他海域以方解石和白云石含量高为特点，主要受波弗特环流的影响，来源主要为加拿大北极群岛的班克斯岛和维多利亚岛，此外还受来自西伯利亚陆架主要是拉普捷夫海沉积物的影响。

关键词: XRD, 北冰洋西部, 矿物学, 表层沉积物, 物质来源

Abstract: Mineralogical analysis was performed on bulk sediments of 79 surface samples by the X-ray diffraction (XRD) method, combined with ocean currents and geological background, the sources of the mineral assemblages partitions have been investigated.Mineral assemblages and distribution indicate that material sources in the study area are complicated:: (1) Feldspar is high in the sediment of Chukchi Sea near the the Bering Strait, the sources are sediments from Anadyr River carried by Anadyr current. Sediments in the west side of the Chukchi Sea, also rich in feldspar, and compared with other area, the content hornblende of is high, which is t subject to Anadyr stream and Siberian Coastal Current carried sediments from Siberia where covered some volcanic and sedimentary rocks. Sediments in the eastern Chukchi Sea are rich in quartz, the sources are the Yukon River and Kasikuimu river sediments carried by Alaska coastal current. Sediments in the northern Chukchi Sea are rich in quartz and Carbonate, mainly carried by Mackenzie River.(2)In the sediments of south and center of the Canda basin, calcite and dolomite are very low,mainly due to the little impact of Beaufort gyre which can carried carbonates from Canadian Arctic Islands, and compared with other area, the content of mica is high,so the Laptev sea sediment become the main sources. In the other deep sea area, calcite and dolomite are very high,because of the sediments carried by Beaufort gyre from Canadian Arctic Islands(Banks Island and Victoria Island), and Siberia Laptev Sea also provide small parts of the sediment. In addition, Atlantic mid-water contributed some fine-grained material for the entire deep sea of the western arctic ocean.

Key words: X-ray diffraction, western Arctic Ocean, minerals, surface sediments, sources