印度洋东经90°海岭表层沉积物浮游有孔虫分布特征及其影响因素  

Distribution and influencing factors of planktonic foraminifera in surface sediments of the Ninetyeast Ridge in Indian Ocean

作　　者：胡昱洁 李小艳 宋召军 张彬 殷征欣 张辉 胡倩男 丁旋[5] HU Yujie;LI Xiaoyan;SONG Zhaojun;ZHANG Bin;YIN Zhengxin;ZHANG Hui;HU Qiannan;DING Xuan(College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural Resources,Qingdao 266061,China;Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266237,China;South China Sea Marine Engineering Surveying Center,State Oceanic Administration,Guangzhou 510275,China;School of Ocean Sciences,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]山东科技大学地球科学与工程学院,青岛266590 [2]自然资源部第一海洋研究所,自然资源部海洋地质与成矿作用重点实验室,青岛266061 [3]青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室,青岛266237 [4]国家海洋局南海调查技术中心,自然资源部海洋环境探测技术与应用重点实验室,广州510275 [5]中国地质大学(北京)海洋学院,北京100083

出　　处：《海洋地质与第四纪地质》2023年第1期105-117,共13页Marine Geology & Quaternary Geology

基　　金：全球变化与海气相互作用专项“东印度洋IND-CJ04区块海底底质和底栖生物调查”(GASI-02-IND-CJ04)。

摘　　要：对东印度洋90°海岭附近海域82个表层沉积物样品中的浮游有孔虫进行鉴定统计分析,揭示了研究区表层沉积物中浮游有孔虫区域分布特征,并对其影响因素进行了初步探讨。研究表明,东印度洋90°海岭附近海域表层沉积物中浮游有孔虫呈现典型的热带-亚热带组合特征,共鉴定出浮游有孔虫30种。运用聚类分析,得到3个浮游有孔虫组合:组合类群Ⅰ主要分布在5°~10°N的孟加拉湾南部开阔海域,主要种属包括Globigerinoides sacculifer, Globigerinoides ruber, Neogloboquadrina dutertrei,体现了生产力及海水盐度对有孔虫组合的影响;组合类群Ⅱ主要在5°N至5°S,沿东经90°海岭分布。主要种属包括Globigerinoides ruber,Globorotalia menardii,Neogloboquadrina dutertrei,体现了水深及生产力对有孔虫组合的影响;组合类群Ⅲ对称分布在组合类群Ⅱ两侧水深较深的海域,主要种属包括Globorotalia tumida, Globorotalia menardi, Pulleniatina obliquiloculata,体现了水深对有孔虫组合特征的影响。根据有孔虫组合类群分布特征,推断水深、盐度及生产力是影响本海域浮游有孔虫分布的最主要因素。Eighty-two surface sediment samples were collected from the Ninetyeast Ridge of the eastern Indian Ocean, from which planktonic foraminifera community fossils were identified and statistically analyzed. The regional distribution characteristics of planktonic foraminifera in surface sediments were revealed, and the influencing factors discussed. Results show that the planktonic foraminifera displayed typical tropicalsubtropical attributes, and 30 species of planktonic foraminifera were identified. The planktonic foraminifera were classified into groups(assemblages) in cluster analysis. Group Ⅰ included mainly Globigerinoides sacculifer, Globigerinoides ruber, and Neogloboquadrina dutertrei,distributed mostly in the open sea area in the south of the Bay of Bengal from 5°N to 10°N, and affected by productivity and salinity of seawater.Group Ⅱ included Globigerinoides ruber, Globorotalia menardii, and Neogloboquadrina dutertrei, occupied mainly between 5°N and 5°S along the Ninetyeast Ridge, and related to the depth and productivity. Group Ⅲ contained mainly Globorotalia tumida, Globorotalia menardi, and Pulleniatina obliquiloculata, distributed symmetrically in deep water areas on both sides of Group 2, and were closely depth dependent.Therefore, the distribution patterns of planktonic foraminifer assemblages are closely affected by water depth, salinity, and productivity of planktonic foraminifera in the sea area.

关 键 词：表层沉积物 浮游有孔虫 沉积环境 东经90°海岭 印度洋 

分 类 号：P736.21[天文地球—海洋地质]