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印度洋卡尔斯伯格洋脊西南侧具有特殊的风尘沉积模式，为进一步了解该区域的沉积特征以及对印度洋季风的响应，对采自该洋脊西南侧的CJ09-19号柱状沉积物开展了黏土矿物、粒度和AMS14C年代分析，探讨了27 kaBP以来卡尔斯伯格洋脊西南侧黏土矿物的物质来源、演变过程和主控因素。研究表明该岩芯沉积物主要为钙质粉砂，以有孔虫为主要成分，黏土组分平均含量为23%，其中黏土矿物以伊利石为主，其次为蒙皂石，高岭石和绿泥石含量较少，还出现了少量坡缕石；该岩芯黏土矿物主要来自阿拉伯半岛和非洲东北部地区。末次冰期以来经历了3个阶段：阶段I(26.9～19 kaBP)以混合物源为主，阶段II(19～11 kaBP)主要来源于阿拉伯半岛，阶段III(11～0 kaBP)主要来源于阿拉伯半岛和非洲东北部地区。物源的演变主要受控于印度洋西南季风的强度。研究发现坡缕石/伊利石峰高比值能够指示印度洋西南季风强度的变化，可作为印度季风替代性指标的补充。
Abstract：The southwestern flank of the Carlsberg Ridge in the Indian Ocean exhibits distinctive pattern of aeolian dust deposition, offering valuable insights into the sedimentary characteristics of the region and its response to the Indian Ocean monsoon. Based on the CJ09-19 sediment core collected from the southwestern part of the ridge, analyses of clay minerals and grain size, and AMS 14C dating were conducted.The sources, evolutionary processes, and controlling factors of clay minerals in the southwestern Carlsberg Ridge over the past 27 000 years(27 kaBP) were explored. Results show that the sediments of the core station were mainly calcareous ooze, with foraminifera as the main component. The average content of clay minerals was 23%, among which the clay minerals were mainly illite, followed by smectite, and less contents of kaolinite and chlorite, with a small amount of palygorskite. The clay minerals of the sediments were primarily derived from Arabian Peninsula and northeast Africa, and the downcore variability of clay mineral contents show that Core CJ09-19 could be divided into three stages.Stage I(26.9～19 kaBP): the clay minerals were mainly from mixture sources of Arabian Peninsula and northeast Africa; Stage II(19～11 kaBP):were primarily derived from Arabian Peninsula; and Stages III(11～0 kaBP): were mainly from the Arabian Peninsula and northeast Africa. The evolution of clay mineral sources during 27 kaBP was mainly controlled by the intensity of the southwest monsoon in the Indian Ocean. The study also showed that the ratio of palygorskite/illite could indicate the intensity of the southwest monsoon in the Indian Ocean, and could be used as a proxy to the India monsoon.
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基本信息:
DOI：10.16562/j.cnki.0256-1492.2024092902
中图分类号:P736.3
引用信息:
[1]汪珂宇,陈坚,冯秀丽,等.2.7万年以来卡尔斯伯格洋脊西南侧黏土矿物来源及演变[J].海洋地质与第四纪地质,2026,46(01):32-43.DOI:10.16562/j.cnki.0256-1492.2024092902.
基金信息:
自然资源部专项“全球变化与海气相互作用专项（二期）”（GASI-04-HYDZ-02）,“西印度洋WIND-CJ09区块海洋底质调查与研究”（GASI-02-WIND-CJ09）