Mineralogical study of surface sediments in the western Arctic Ocean and their implications for material sources
Mineralogical study of surface sediments in the western Arctic Ocean and their implications for material sources
复制标题
DOI：
10.13679/j.advps.2014.3.00192
复制
发表时间：
2014-07
期刊：
影响因子：
--
通讯作者：
Dong Linsen;S. Xuefa;L. Yan-guang;Fang Xi-sheng;Chen Zhihua;Wang Chunjuan;Zou Jianjun;Hu Yuanhui
中科院分区：
文献类型：
--
作者：
Dong Linsen;S. Xuefa;L. Yan-guang;Fang Xi-sheng;Chen Zhihua;Wang Chunjuan;Zou Jianjun;Hu Yuanhui
利用X射线衍射对79个表层样品的沉积物进行了矿物学分析。根据分析结果，结合海流资料和区域地质背景，探讨了矿床的来源。沉积物中矿物组合及其在研究区的分布表明，物质来源复杂。（1）白令海峡附近楚科奇海中部沉积物中富含长石，其来源于阿纳迪尔海流携带的阿纳德尔河沉积物。楚科奇海西侧沉积的沉积物富含长石。与其它地区相比，该地区沉积物中富含由阿纳德尔流和西伯利亚沿岸流从西伯利亚火山岩和沉积岩中搬运而来的角闪石。楚科奇海东部沉积物中富含石英，石英来源于阿拉斯加沿岸流携带的育空地区和Kuskokwim河沉积物。楚科奇海北方沉积物中富含来自麦肯齐河沉积物的石英和碳酸盐。(2)加拿大海盆南部和中部沉积物中含有少量方解石和白云石，主要是受携带加拿大北极群岛碳酸盐的博福特环流影响较小所致，与其它地区相比，该地区云母含量较高，表明拉普捷夫海是加拿大海盆南部和中部的主要沉积物源。在其他深海区，方解石和白云石含量很高，这是由于博福特环流从加拿大北极群岛（班克斯和维多利亚）携带的大量沉积物输入造成的。西伯利亚拉普捷夫海也为这一地区提供了少量的沉积物。此外，大西洋中层水为整个北冰洋西部深海提供了一些细粒物质。
Mineralogical analysis was performed on bulk sediments of 79 surface samples using X-ray diffraction. The analyticalresults, combined with data on ocean currents and the regional geological background, were used to investigate the mineralsources. Mineral assemblages in sediments and their distribution in the study area indicate that the material sources are complex. (1)Feldspar is abundant in the sediments of the middle Chukchi Sea near the Bering Strait, originating from sediments in the AnadyrRiver carried by the Anadyr Current. Sediments deposited on the western side of the Chukchi Sea are rich in feldspar. Comparedwith other areas, sediments in this region are rich in hornblende transported from volcanic and sedimentary rocks in Siberia by theAnadyr Stream and the Siberian Coastal Current. Sediments in the eastern Chukchi Sea are rich in quartz sourced from sedimentsof the Yukon and Kuskokwim rivers carried by the Alaska Coastal Current. Sediments in the northern Chukchi Sea are rich inquartz and carbonates from the Mackenzie River sediments. (2) Sediments of the southern and central Canada Basin contain littlecalcite and dolomite, mainly due to the small impact of the Beaufort Gyre carrying carbonates from the Canadian Arctic Islands.Compared with other areas, the mica content in the region is high, implying that the Laptev Sea is the main sediment source forthe southern and central Canada Basin. In the other deep sea areas, calcite and dolomite levels are high caused by the input of largeamounts of sediment carried by the Beaufort Gyre from the Canadian Arctic Islands (Banks and Victoria). The Siberian LaptevSea also provides small amounts of sediment for this region. Furthermore, the Atlantic mid-water contributes some fine-grainedmaterial to the entire deep western Arctic Ocean.