南极布兰斯菲尔德海峡表层沉积物中微量元素的分布特征

DISTRIBUTION FEATURES OF MICROELEMENTS IN SUPERFICIAL DEPOSITS AT ANTARCTIC BRANSFIELD STRAIT

本文通过对南极布兰斯菲尔德海峡沉积物中微量元素分布状况的研究,指出该海区沉积物的分布是受海峡两侧火山源及陆源物质迁移的影响。特别是北侧南设得兰群岛基性火山岩矿物对岛架和岛坡都有明显的影响,直至深海槽区才有所减弱,逐渐反映出海洋沉积物的一般地球化学特征;而南极半岛一侧由于地形相对平缓,陆源物质的影响比北侧弱。

The study upon the distribution of superficial deposited microelements in Antarctic Bransfield Strait indicats that the distribution of local deposit are controlled mainly by the volcanic and terrestrial materials migration from both strait flanks. The northern flank is steep and so the migratory influence, i.e. the basic volcanic mineral from the insular shelf to slope of S. Shetland Islands is obvious, such influence eventually reduced in deep trough and then reflected the normal geochemical feature of marine deposit. However, the terrigenous de- posit influence of the southern flat flank is more slight than that of the north.