45 ka以来阿拉伯海西南部物源和阶段性沉积演变

冯启营; 范德江; 汪珂宇; 贾贤明; 陈坚

doi:10.12284/hyxb2023123

45 ka以来阿拉伯海西南部物源和阶段性沉积演变

doi: 10.12284/hyxb2023123

冯启营^{1, 2,},
范德江^{1, 3},
汪珂宇^{1, 2},
贾贤明^{2, 4},
陈坚^{2, 5, ,}

1.
中国海洋大学海洋地球科学学院，山东青岛 266100
2.
自然资源部第三海洋研究所海洋与海岸地质实验室福建厦门 361005
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山东青岛 266061
4.
上海海洋大学海洋科学学院上海 201306
5.
福建省海洋物理与地质过程重点实验室福建厦门 361005

基金项目: 全球变化与海气相互作用专项（GASI-04-HYDZ-02，GASI-02-WIND-CJ09）。

详细信息

作者简介:
冯启营（1997—），男，山东省临沂市人，主要从事海洋沉积学研究。E-mail：1942221718@qq.com

通讯作者:
陈坚，教授级高工，主要从事海洋沉积动力研究。E-mail：chenjian@tio.org.cn

中图分类号: P724.3；P736.21
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出版历程
- 收稿日期: 2023-02-03
- 修回日期: 2023-04-15
- 网络出版日期: 2023-12-14
- 刊出日期: 2023-10-30

Provenance and sedimentary evolution of the Southwest Arabian Sea since 45 ka

Feng Qiying^{1, 2
,},
Fan Dejiang^{1, 3},
Wang Keyu^{1, 2},
Jia Xianming^{2, 4},
Chen Jian^{2, 5
, ,}

1.
College of Marine Geosciences, Ocean University of China, Qingdao 266100, China
2.
Laboratory of Marine and Coastal Geology, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
3.
Laboratory for Marine Geology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266061, China
4.
College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China
5.
Fujian Provincial Key Laboratory of Marine Physical and Geological Processes, Xiamen 361005, China

摘要

摘要: 选取阿拉伯海西南部沉积物柱状样CJ09-03顶部100 cm样品开展粒度、元素、黏土矿物以及AMS¹⁴C测年分析，探讨了45 ka以来研究区的物源、沉积演变及其制约因素。黏土和元素组成显示，研究区沉积物除含有较多的有孔虫等微体生物壳体和碎片以外，还具有明显的陆源属性；(La/Sm)_UCC-(Gd/Yb)_UCC及黏土矿物组成显示沉积物的来源相对复杂，主要物源地有塔尔沙漠、非洲东北部、伊朗和阿拉伯半岛。结合前人的西阿拉伯海季风指标δ¹⁵N，伊利石化学指数、K/Al、1−CaCO₃(%)等，可将阿拉伯海西南部45 ka以来沉积演化分为末次冰期、末次盛冰期、冰消期以及全新世阶段4个阶段，不同阶段物质来源和贡献主要是受到海平面升降以及印度洋季风强弱的影响。
- 阿拉伯海 /
- 黏土矿物 /
- 稀土元素 /
- 物质来源 /
- 沉积演变
Abstract: Grain size, composition of elements and clay minerals, and AMS¹⁴C dating of samples of upmost 100 cm in Core CJ09-03 in the Southwest Arabian Sea were analysied, and provenance, the sedimentary evolution and the restricting factors in the study area since 45 ka BP were discussed. The composition of major elements and rare earth elements show that, the sediment in the study area has obvious terrigenous properties Graph of (La/Sm)_UCC-(Gd/Yb)_UCC and the composition of clay minerals show that the sources of the sediments in the study area are relatively complex, which include the Thar Desert, the Northeast Africa, the Southwest Asia and the Arabian Peninsula. Based on the index of δ¹⁵N from literatures, and indexs of chemical weathering index of illite, K/Al, 1−CaCO₃(%), the sedimentary evolution of the Southwest Arabian Sea since 45 ka BP can be divided into four stages: the Last Glacial period, the Last Glacial Maximum periond, the Deglaciation period and the Holocene period. The provenance in different stages are different, which is mainly influenced by the sea level changes and the strength of the Indian monsoon.
- Arabian Sea /
- clay minerals /
- rare earth elements /
- provenance /
- sedimentary evolution

HTML全文

图 1 研究柱样位置和阿拉伯海季风海流概貌

Fig. 1 Location of the study core and general situation of monsoon and ocean currents in the Arabian Sea

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图 2 CJ09-03孔ASM¹⁴C年龄框架及沉积速率

Fig. 2 Age frame from ASM¹⁴C data and deposition rate of Core CJ09-03

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图 3 沉积物粒度参数垂向变化

Fig. 3 Variation of grain size parameters of the study sediment

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图 4 常量元素垂向变化

Fig. 4 Vertical variation of the main elements

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图 5 稀土元素参数变化

Fig. 5 Changes of rare earth element parameters

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图 6 稀土元素标准化配分模式及与邻区比较^{[27，36–40]}

Fig. 6 The standardized partition pattern of rare earth elements of the study area and neighboring regions^{[27，36–40]}

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图 7 黏土矿物含量变化

Fig. 7 Variation of content of clay minerals

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图 8 (La/Sm)_UCC-(Gd/Yb)_UCC物源判别^{[27，36–40]}

Fig. 8 Provenance discrimination on (La/Sm)_UCC-(Gd/Yb)_UCC^{[27，36–40]}

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图 9 蒙脱石−高岭石−（伊利石+绿泥石）物源判别^{[1，13，20，39，52–54]}

Fig. 9 Provenance identification on montmorillonite-kaolinite-(illite + chlorite) ^{[1，13，20，39，52–54]}

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图 10 CJ09-03孔沉积物K/Al、CIA*、1−CaCO₃（%）、伊利石化学指数与格陵兰冰芯氧同位素及西阿拉伯海RC27-14 δ¹⁵N分布^[59−61]

Fig. 10 Index of K/Al, 1−CaCO₃(%), illite chemical index of Core CJ09-03 sediment with oxygen isotope curve of the Greenland ice core and δ¹⁵N of Core RC27-14 in the West Arabian Sea^[59−61]

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表 1 CJ09-03孔有孔虫AMS¹⁴C测年数据

Tab. 1 AMS¹⁴C dating data of plankton foraminifera in the Core CJ09-03

层位/cm	AMS¹⁴C 年龄/（cal a BP）	日历年龄/（cal a BP）（±2σ）	测试材料
18～20	10 560 ± 30	11 336（11 182～11 557）	Globorotalia menardii，Globorotalia tumida
38～40	20 550 ± 70	23 524（23 237～23 767）
58～60	30 110 ± 150	33 602（33 177～34 002）
78～80	37 980 ± 340	41 463（40 985～41 922）
98～100	43 070 ± 640	44 713（43 661～45 828）

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