CAJ | 학술논문

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，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一些高含长石的火山岩及沉积岩等。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，一些黏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。
대북빙양서부79개표층침적물양품진행료전암X사선연사광물조성분석，결합양류화지질배경，탐토각광물분구적물질래원。광물조합분구표명연구구물질래원변화교위복잡：（1）재초과기해적중부고근백령해협처장석함량흔고，주요시아납덕이류휴대적래자아납덕이하적침적물；재초과기해적서측적장석함량야교고，차여기타광물조합분구상비，각섬석함량교고，저시인위수아납덕이류화동서백리아연안류적쌍중영향，침적물래자서백리아륙지적일사고함장석적화산암급침적암등。재초과기해적동측，석영함량흔고，래원위아랍사가연안류휴대적육공하급잡사규모하적침적물。재아랍사가북부，탄산염암화석영함량고，저여마경사하반운적침적물유관；（2）북빙양서부심수구중가나대해분적남단화중부방해석화백운석적함량교저，설명수파불특배류휴대적가나대북겁군도적탄산염영향상대교소，차여기타광물조합분구상비，운모함량최고，설명침적물주요래원위래자랍보첩부해적해빙침적물；차외，일사점토급세립물질가능유대서양중층수휴대이래。심수구적기타해역이방해석화백운석함량고위특점，주요수파불특배류적영향，래원주요위가나대북겁군도적반극사도화유다리아도；차외，환수래자서백리아륙가，주요시랍보첩부해침적물적영향。
Mineralogical analysis was performed on bulk sediments from 79 surface samples using the X-ray diffraction (XRD)method.The results,in combination with data on ocean currents and the geological background,have been used to investigate the sources of the mineral assemblages.Mineral assemblages and distribution indicate that material sources in the study area are complicated:(1 )Feldspar is abundant in the sediments of the Chukchi Sea near the Bering Strait,and the source is material from the Anadyr River carried by the Anadyr Current.The sedi-ments on the western side of the Chukchi Sea are also rich in feldspar,and compared with other areas,which are also rich in hornblende,which is the result of the Anadyr Current and the Siberian Coastal Current carrying material from Siberia,where some volcanic and sedimentary rocks are present.The sediments in the eastern Chukchi Sea are rich in quartz,the sources of which are sediments from the Yukon River and the Kuskokwim River carried by the Alaska Coastal Current.The sediments in the northern Chukchi Sea are rich in quartz and carbonates,the sources of which are sediments from the Mackenzie River.(2)In the sediments of the southern and central parts of the Canada Basin,calcite and dolomite levels are very low,mainly because of the small impact of the Beaufort Gyre,which carries carbonates from the Canadian Arctic Archipelago.And compared with other area,the content of mica is also high,so the Laptev Sea is the main sediment source for the southern and central parts of the Canada Basin.In the other deep sea areas,calcite and dolomite levels are very high,because of the sediments carried by the Beaufort gyre from the Canadian Arctic Archipelago (Banks Island and Victoria Island).The Siberian Laptev Sea also provides small amounts of sediment.In addition,the Atlantic mid-water contributes some fine-grained ma-terial to the entire deep sea of the western Arctic Ocean.