| 近1 Ma以来帕里西维拉海盆沉积物物源和古气候:粒度和黏土矿物特征的指示 |
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| 引用本文： | 肖春晖,王永红,林间.近1 Ma以来帕里西维拉海盆沉积物物源和古气候:粒度和黏土矿物特征的指示[J].沉积学报,2022,40(2):508-524. |
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| 作者姓名： | 肖春晖 王永红 林间 |
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| 作者单位： | 1.海底科学与探测技术教育部重点实验室, 中国海洋大学海洋地球科学学院, 山东 青岛 266100 |
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| 基金项目： | 国家重点研发计划（2016YFC0402602）；;国家自然科学基金（41376054,41176039,41410304022,91628301,U1606401）； |
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| 摘 要： | 通过对西太平洋帕里西维拉海盆的C-P19柱状样沉积物进行磁化率各向异性测量和古地磁分析，建立了磁性地层年代框架，并结合粒度组分和黏土矿物分析，揭示了沉积物中蕴含的物源和古气候信息。古地磁结果表明，C-P19柱状样的底界年龄小于1.072 Ma，为更新世以来的沉积，沉积过程可以划分为两个阶段，沉积速率分别为4.0 mm/kyr（约1~0.78 Ma）和3.6 mm/kyr（0.78 Ma~至今）。粒度和黏土矿物结果表明，研究区的沉积物类型以粉砂和砂质粉砂为主，少部分为黏土质粉砂；黏土矿物组成中伊利石+绿泥石的平均含量高达70%。利用SPSS对粒度参数进行主成分分析可知，研究区的粗颗粒物质来源主要为帕里西维拉海盆内或周围海脊的火山岛弧碎屑物质，细颗粒组分主要来自亚洲大陆风尘。利用2~4 μm沉积物粒度组分百分含量和（伊利石+绿泥石+高岭石）/蒙脱石的比值作为替代指标反映了研究区亚洲风尘物质贡献比例的波动，进而揭示了1 Ma以来风尘源区气候干湿程度以及东亚冬季风强度的演变过程。
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| 关 键 词： | 物源 古气候 帕里西维拉海盆 西太平洋 亚洲风尘 |
| 收稿时间： | 2020-02-18 |
Provenance and Paleoclimate of Sediments in the Parece Vela Basin in Past 1 Ma:Inferences from grain-size and clay mineral distribution |
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| XIAO ChunHui,WANG YongHong,LIN Jian.Provenance and Paleoclimate of Sediments in the Parece Vela Basin in Past 1 Ma:Inferences from grain-size and clay mineral distribution[J].Acta Sedimentologica Sinica,2022,40(2):508-524. |
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| Authors: | XIAO ChunHui WANG YongHong LIN Jian |
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| Institution: | 1.Key Lab of Submarine Geosciences and Prospecting Techniques, MOE and College of Marine Geosciences, Ocean University of China, Qingdao, Shandong 266100, China2.Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA3.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China |
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| Abstract: | Measurement of magnetic susceptibility anisotropy and paleomagnetic analysis of the core C-P19 in the Parece Vela Basin of the western Pacific Ocean established the age framework of the magnetostratigraphy. Grain size and clay minerals analysis determined provenance and paleoclimate. The paleomagnetic results show that the sedimentary sequence has a lower limit age younger than 1.072 Ma， which includes the deposition since the early Pleistocene. The sedimentation process was divided into two stages: one with a sedimentation rate of 4.0 mm/kyr during ca. 1?0.78 Ma， and the other at 3.6 mm/kyr since 0.78 Ma. The grain size and clay mineral analyses showed that the predominant sediment types in the study area are silty and sandy silt， with a small clayey silt component. The average content of illite + chlorite in the clay mineral composition is as high as 70%. A principal component analysis of the granularity parameters by SPSS software indicates that the source of coarse-grained material in the study area is mainly volcanic island arc clastic material in and around the Parece Vela Basin， and the fine-grained component is mainly from Asian dust. The percentage content of the 2?4 μm grain size component and the ratio of （illite + chlorite + kaolinite） / smectite corresponds closely with fluctuations in the contribution of Asian dust in the study area. These were used as an alternative indicator to reveal both the dryness or wetness of the paleoclimate in the source area and the evolution process of East Asian winter monsoon intensity since 1 Ma. |
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