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作 者:金秉福[1,2] 林晓彤[1] 季福武[1] 刘炎光[3] 林振宏[1]
机构地区:[1]中国海洋大学 [2]烟台师范学院,烟台264025 [3]国家海洋局第一海洋研究所
出 处:《海洋地质与第四纪地质》2005年第1期25-31,共7页Marine Geology & Quaternary Geology
基 金:国家自然科学基金项目(40076013)
摘 要:对钓鱼岛北侧东海外陆架Q43孔(26°33.1401′N、124°12.7107′E)岩心的沉积层序、粒度参数和碎屑矿物进行了研究,揭示了东海外陆架末次盛冰期低海面时的滨岸浅水沉积特征.钻孔柱样为一不完整的滨海相沉积层序:上部为粉砂质细砂层(0~230 crm),是末次盛冰期沉积物,代表古海岸前滨高能环境;下部为细砂质粉砂层(230~374 cm),代表滨外浅水低能环境.整个柱样表现出分选程度不高、悬浮组分多、矿物棱角明显、风化程度低和不稳定矿物含量高等特点,表明沉积物分选改造不强烈.这与以往对东海的残留沉积的认识不同,反映出末次盛冰期东海沉积环境的多元性.The studies on the sedimentary sequences, grain size composition and detrital minerals reveal the general sedimentary characteristics of littoral zone during the last glacial maximum in core Q43 (26°33.1401′N,124°12.7107′E)drilled in the outer shelf of the East China Sea. The core does not show an integrated sequence of littoral facies. It consists of silty fine sand stratum (0~230 cm) formed in the period of the last glacial maximum, which indicated high hydraulic conditions in foreshore,and fine sandy silt stratum (230~374 cm), showing low hydraulic conditions in offshore. There are many fragments of shell in the core. The silty fine sand stratum in the core is in poor sorting,rich in suspended particle, in low weathering, of abundant angular minerals, and with rich non-stationary minerals. These characteristics show that sediments in the outer shelf of the East China Sea have not experienced a strong sorting and alteration. This view is different from the former scholars' about the relict sediment in the East China Sea. It suggests that the sedimentary environment during the last glacial maximum is multiform.
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