CAJ | 학술논문

通过对白令海盆中部BR02岩芯高分辨率的颜色、粒度和元素地球化学地层的研究发现：（1）该岩芯较为完整地记录了末次盛冰期结束以来（约16．3 ka BP）的多期冰筏碎屑事件，包括H1、OD、YD和北方2期，其中以H1和YD最为显著，反映了末次冰消期以来该地区海冰/冰山以及区域性冰川的消长变化；（2）BR02岩芯上部17-25 cm段出现富Mn、富Ba的氧化型沉积，说明在全新世高海面时期，白令海与北太平洋、北冰洋之间的水体交换达到极点，白令海环流加强，海盆底层水含氧状况明显改善，并引发海洋生产力增加；（3）CaO、Na2 O、Sr、Zr及Na2 O/K2 O比值的分布说明，海盆冰筏碎屑主要来自富碳酸盐的育空河流域，其次为阿拉斯加半岛和阿留申群岛等火山岩区；岩芯上部Na2 O/K2 O比值的递增暗示10 ka BP以来与火山物质输运有关的北太平洋入流（阿拉斯加流）可能增加。
통과대백령해분중부BR02암심고분변솔적안색、립도화원소지구화학지층적연구발현：（1）해암심교위완정지기록료말차성빙기결속이래（약16．3 ka BP）적다기빙벌쇄설사건，포괄H1、OD、YD화북방2기，기중이H1화YD최위현저，반영료말차빙소기이래해지구해빙/빙산이급구역성빙천적소장변화；（2）BR02암심상부17-25 cm단출현부Mn、부Ba적양화형침적，설명재전신세고해면시기，백령해여북태평양、북빙양지간적수체교환체도겁점，백령해배류가강，해분저층수함양상황명현개선，병인발해양생산력증가；（3）CaO、Na2 O、Sr、Zr급Na2 O/K2 O비치적분포설명，해분빙벌쇄설주요래자부탄산염적육공하류역，기차위아랍사가반도화아류신군도등화산암구；암심상부Na2 O/K2 O비치적체증암시10 ka BP이래여화산물질수운유관적북태평양입류（아랍사가류）가능증가。
From a high-resolution study of sediment grain size,color reflectance and elemental stratigraphy of core BR02, which was dredged from the central part of the Bering Basin,we came to the following conclusions.(1 )Core BR02 provides perfect records of the ice-rafted detritus (IRD)events that have happened since 16.3 ka BP at the end of the Last Glacial Maximum,including the H1 ,OD,YD and Boreal 2 events,of which H1 and YD are the most sig-nificant.These IRD events all happened during cold episodes or stadials,and indicate changes in sea ice/icebergs in the sea and local glaciers in the surrounding lands.(2)The interval of Mn-and Ba-rich sediments at 17-25 cm in the upper part of BR02 indicates that water exchange between the North Pacific Ocean,the Bering Sea,and the Arctic Ocean increased to its highest level during the Holocene high-sea-level period,which induced changes in the circulation and seabed redox and an increase in marine productivity in the Bering Basin.(3)The concentrations of CaO,Na2 O,Sr and Zr and the Na2 O/K2 O ratio indicate that the IRD was mainly derived from the Yukon River drainage,and secondarily from the volcanic province that includes the Alaska Peninsula and the Aleutian Islands. Meanwhile,the gradual increase in the Na2 O/K2 O ratio in the upper part of the core indicates that the circulation, especially the influence of the Alaska Current on sediments,has been enhanced since 10 ka BP.