摘要
南极半岛西北海域表层沉积特中,微植物有机质颗粒包括五种类型:现代孢粉、再沉积孢粉、具结构有机质残骸、无结构有机质颗粒以及海藻类。按成因可分为陆生物质和海生物质两大类。本文分析陆生微植物有机质、特别是再沉积孢粉和无结构有机颗粒的组分、丰度、时代及分布格局,指出区内表层沉积物可能属于近源补给成因,半岛陆架、南设德兰群岛岛架和岬湾等的水动力条件强于海峡中央,并探讨了物源与海流的关系。
Five palynomorphs (microflora organic materials), including the terrigenous and marine origin, have been identified from the surface sediments in Bransfield Strait off northwest Antarctic peninsula. They are modem sporopollen, reworked sporopollen, structural palynomorph debris, amorphous pa- lynomorph debris and marine algae. Among them the reworked sporopollen and amorphous paly- nomorph debris belong to the terrigenous supply are not only comparatively abundant, but also widely distributed. Composition and age of the reworked sporopollen assemblage and its distribution pattern indicate that five reworked zones at least could be distinguished from each other and most terrigenous supply is proximal or nearby parent rocks. The abundance ratio between amorphous palynomorph de- bris and reworked sporopollen shows linearly positive dependent except the samples taken from the northem shallow water and southem shelf with the upper slope of the strait, where the water dynamic condition might be more strong or terrigenous supply concerned less.
出处
《南海地质研究》
1996年第8期97-107,共11页
Gresearch of Eological South China Sea
基金
国家南极基金(南85-03-05-01)
