中全新世晚期以来南极宇航员海沉积物的稀土元素和Sr-Nd同位素特征及物源意义

张泳聪; 胡良明; 孙曦; 韩喜彬; 龙飞江; 武文栋; 向波; 王逸卓; 葛倩; 边叶萍

doi:10.12284/hyxb2023076

中全新世晚期以来南极宇航员海沉积物的稀土元素和Sr-Nd同位素特征及物源意义

doi: 10.12284/hyxb2023076

张泳聪^{1, 2,},
胡良明^{1, 2},
孙曦^{1, 2},
韩喜彬^{1, 2, ,},
龙飞江³,
武文栋⁴,
向波³,
王逸卓³,
葛倩^{1, 2},
边叶萍^{1, 2}

1.
自然资源部海底科学重点实验室，浙江杭州 310012
2.
自然资源部第二海洋研究所，浙江杭州 310012
3.
成都理工大学沉积地质研究院，四川成都 610059
4.
上海交通大学机械与动力工程学院，上海 200240

基金项目: 国家重点研发计划（2022YFC2905500）；自然资源部专项（IRASCC2020−2022）；中央级公益性科研院所基本科研业务费专项资金项目（SZ2102)；上海交通大学“深蓝计划”基金（SL2002）。

详细信息

作者简介:
张泳聪（1997-），男，广东省佛山市人，主要从事海洋沉积研究工作。E-mail: 734694351@qq.com

通讯作者:
韩喜彬，男，博士，副研究员，主要从事海洋地质研究工作。E-mail: hanxibin@sio.org.cn

中图分类号: P736.4
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出版历程
- 收稿日期: 2022-09-22
- 修回日期: 2022-10-17
- 网络出版日期: 2023-06-13
- 刊出日期: 2023-05-01

Rare earth element and Sr-Nd isotopic characteristics of the sediments in Antarctic Cosmonaut Sea and their provenance significances since the late Middle-Holocene

Zhang Yongcong^{1, 2
,},
Hu Liangming^{1, 2},
Sun Xi^{1, 2},
Han Xibin^{1, 2
, ,},
Long Feijiang³,
Wu Wendong⁴,
Xiang Bo³,
Wang Yizhuo³,
Ge Qian^{1, 2},
Bian Yeping^{1, 2}

1.
Key Laboratory of Submarine Geosciences, Ministry of Natural Resources, Hangzhou 310012, China
2.
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
3.
Institute of Sedimentary Geology, Chengdu University of Technology, Chengdu 610059, China
4.
School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

摘要

摘要: 开展海洋沉积物物源研究，可以更好地认识其搬运机理与区域及全球物质循环的过程。通过对南极宇航员海ANT36-C4-05岩芯沉积物的稀土元素及Sr-Nd同位素的测试分析开展了沉积物物源研究，结果显示ANT36-C4-05岩芯沉积物的稀土元素平均含量相对较高，轻、重稀土分馏明显，⁸⁷Sr/⁸⁶Sr平均值相对偏高，εNd(0)平均值明显偏负。沉积物的稀土元素及Sr-Nd同位素特征指示中全新世晚期以来，宇航员海沉积物主要来自于东南极普里兹湾周边陆地及恩德比地一带的高级变质岩，这些碎屑物质一方面在冰−海作用下进入宇航员海，其中南极沿岸流与南极陆坡流在其运输过程中发挥了重要作用；同时，其还可能依靠发源于南极内陆高原的下降风完成从源区到研究区的输送过程。物源端元混合模型的结果表明，岩芯沉积物绝大部分（大于70%）来自于普里兹湾地区的变质岩，来自恩德比地物质的贡献相对较少。两个源区对宇航员海沉积物的贡献存在明显差异，这与地区之间冰川、洋流及风力的差异有关：与恩德比地相比，中山站一带的冰川规模较大，运动速度较快，其对基岩的侵蚀与搬运能力更强；发源于普里兹湾底层的南极底层水可能在普里兹湾−宇航员海的物质输送过程中发挥了一定的作用；普里兹湾地区是南极下降风较为强盛的地区之一，它可以将更多的风化碎屑吹向下风向的宇航员海。这些因素综合导致了宇航员海ANT36-C4-05岩芯沉积物主要来自于普里兹湾的特征。
- REE /
- Sr-Nd同位素 /
- 宇航员海 /
- 粉尘 /
- 物源端元
Abstract: Carrying out researches on marine sediments’ source can help to better understand the mechanism of material transport and the process of regional and global material circulation. A sediment provenance study has been conducted by analyzing the rare earth element and Sr-Nd isotopes of the ANT36-C4-05 core sediment in the Cosmonaut Sea, Antarctic. The results show that the average content of rare earth element (REE) in the sediment is relatively high, with an obvious fractionation between light REE (LREE) and heavy REE (HREE); and the average ⁸⁷Sr/⁸⁶Sr value of the sediment is relatively high, while the average εNd(0) value is significantly negative. The REE and Sr-Nd isotopic characteristics indicate that since the late Middle-Holocene, the sediment is mainly originated from high-grade metamorphic rocks in the vicinity of the Prydz Bay and Enderby Land, East Antarctic. These detrital materials are partly introduced into the Cosmonaut Sea under the ice-sea interaction, with the Antarctic Coastal Current and Antarctic Slope Current playing important roles in the transportation; simultaneously, it may also rely on katabatic winds originating from the Antarctic interior plateau to complete the transport process from source areas to the study area. The results of the provenance end member mixing model show that the sediment is mainly originated from metamorphic rocks in the Prydz Bay area (>70%), while the contribution from Enderby Land is relatively small. The significant difference in the contribution of two source areas is related to the differences in glaciers, ocean currents, and wind forces between two areas: compared to Enderby Land, the glacier in the Prydz Bay area is larger in scale and moves at a faster speed, with a stronger erosive and transport capacity for the bedrock; in the meanwhile, the Antarctic Bottom Water originating from the bottom of the Prydz Bay area may play an important role during the westward transportation; and the Prydz Bay area is one of the stronger wind force regions of katabatic winds, which can contribute more bedrock debris to downwind areas, for example the Cosmonaut Sea. These factors result in the characteristic of the ANT36-C4-05 core sediment in the Cosmonaut Sea which is mainly from the Prydz Bay area.
- REE /
- Sr-Nd isotopes /
- Cosmonaut Sea /
- dust /
- provenance end member

HTML全文

图 1 ANT36-C4-05站位（a）、区域环流（b）及下降风（c）^[26]示意图

恩德比地样品区引自文献[27-31]；普里兹湾样品区引自文献[32]；中山站引自文献[32-33]；罗斯海样品区引自文献[33-35]；南极半岛东北部海域样品区引自文献[36]；Vostok冰芯引自文献[37-38]；Dome C冰芯引自文献[38-39]；Taylor冰川引自文献[40]；西南极火成岩引自文献[41- 42]；横贯南极山脉（Transantarctic Mountain, TAM）粉尘样品引自文献[43]

Fig. 1 Sketch map of Station ANT36-C4-05 （a）, the regional current system （b） and the katabatic winds （c）^[26]

Enderby Land sample area cited from references [27-31]; Prydz Bay sample area cited from reference [32]; Zhongshan Station cited from references [32-33]; Ross Sea sample area cited from references [33-35]; Antarctic Peninsula northeasten sea sample area cited from reference [36]；Vostok Ice Core cited from references [37-38]；Dome C Ice Core cited from references [38-39]；Taylor Glacial cited from reference [40]; West Antarctic volcanoes cited from references [41-42]; Transantarctic Mountain （TAM） dust samples cited from reference [43]

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图 2 沉积物与UCC^[54]、南极地区海洋沉积物^{[32, 34, 36]}及岩石^{[27, 32-33, 35-36]}稀土元素（REE）标准化配分模式对比

Fig. 2 The comparison of the rare earth element (REE) standardized distribution model between the sediment and the UCC^[54], marine sediments^{[32, 34, 36]}, and rocks^{[27, 32-33, 35-36]} in the Antarctic

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图 3 沉积物与南极地区海洋沉积物^{[32, 34, 36]}及岩石^{[27, 32-33, 35-36]} 稀土元素（REE）特征对比

Fig. 3 The comparison of the rare earth element (REE) characteristics between the sediment and marine sediments^{[32, 34, 36]}, rocks^{[27, 32-33, 35-36]} in the Antarctic

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图 4 沉积物与南极地区粉尘物质^{[28-31, 33, 37-43]}εNd（0）-⁸⁷Sr/⁸⁶Sr特征对比

Fig. 4 The comparison of the εNd（0） - ⁸⁷Sr/⁸⁶Sr between the sediment and dust materials in the Antarctic^{[28-31, 33, 37-43]}

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图 5 物源端元模拟结果的稀土元素（REE）标准化配分模式对比

Fig. 5 The comparison of the rare earth element (REE) standardized distribution models between the simulation results for the provenance end member mixing model and the original results of the sample

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表 1 沉积物稀土元素（REE）指标统计学特征

Tab. 1 Statistical characteristics of rare earth element (REE) proxies in the sediment

站位	指标	ΣLREE	ΣHREE	ΣREE	ΣLREE/ΣHREE	δCe
ANT36-C4-05	最小值	186.06×10⁻⁶	14.29×10⁻⁶	200.06×10⁻⁶	12.67	1.06
	最大值	210.41×10⁻⁶	16.15×10⁻⁶	225.88×10⁻⁶	13.33	1.08
	平均值	201.27×10⁻⁶	15.52×10⁻⁶	216.47×10⁻⁶	12.97	1.07
	标准差	5.81×10⁻⁶	0.46×10⁻⁶	6.21×10⁻⁶	0.17	0.01
	变异系数	0.03	0.03	0.03	0.01	0.01
注：δCe=Ce_N/（La×Pr）_N^1/2，N表示数据经球粒陨石REE含量^[49]标准化处理；LREE表示轻稀土元素，HREE表示重稀土元素。

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表 2 沉积物Sr-Nd同位素指标统计学特征

Tab. 2 Statistical characteristics of Sr-Nd isotopic proxies in the sediment

站位	指标	⁸⁷Sr/⁸⁶Sr	¹⁴³Nd/¹⁴⁴Nd	εNd（0）
ANT36-C4-05	最小值	0.737 6	0.511 5	−21.76
	最大值	0.739 9	0.511 6	−20.67
	平均值	0.738 4	0.511 55	−21.26
	标准差	0.000 6	<0.000 1	0.27
	变异系数	0.000 8	<0.000 1	−0.01

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表 3 沉积物稀土元素的富集因子（EF）值统计

Tab. 3 Enrichment factors (EF) of the rare earth element in the sediment

	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
EF	2.107	2.147	1.628	1.766	1.382	1.351	1.226	1.116	1.752	0.858	1.015	0.913	0.937	0.840

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表 4 沉积物物源端元计算结果

Tab. 4 Results of the provenance end member mixing model of the sediment

	Sr同位素贡献率/%	Nd同位素贡献率/%
恩德比地	29	17
中山站一带	71	83

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