Provenance of sediments in the Amundsen Sea, West Antarctic since the mid-Holocene and paleoclimate reconstruction

doi:10.13745/j.esf.sf.2022.1.7

Abstract

Abstract:

Grain size and geochemical analyses were carried out on sediment core samples from core A11-02 in the Amundsen Sea, West Antarctic to trace the sediment sources and reconstruct the history of paleoclimatic evolution since the mid-Holocene. By analyzing and comparing the North American Shale Composite normalized rare earth element (REE) patterns and indicators such as (La/Yb)_N, (Gd/Lu)_N and (La/Sm)_N, we concluded that the core sediments mainly originate from the Marie Byrd Land, with contributions, to some extent, from the Bellingshausen Sea. By multi-index analysis comparing the Chemical Index of Alteration, Na/K ratio and grain contents for grain sizes less than 22.1 μm or greater than 63 μm with other paleoclimate records, we identified four distinct cooling phases in the Amundsen Sea since the mid-Holocene. We found the millennial-scale climate changes are temporally and spatially consistent across the Antarctic and mainly controlled by changes in insolation and atmospheric circulation.

Key words: Amundsen Sea, grain size, geochemical elements, sediment provenance, paleoclimate

CLC Number:

LEI Ziyan, GE Qian, CHEN Dong, ZHANG Yongcong, HAN Xibin, YE Liming, BIAN Yeping, XU Dong. Provenance of sediments in the Amundsen Sea, West Antarctic since the mid-Holocene and paleoclimate reconstruction[J]. Earth Science Frontiers, 2022, 29(4): 179-190.

Figures/Tables 12

References 67

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深度/ cm	AMS ¹⁴C 年龄/a	日历年龄范围 (1σ)/Cal a BP	碳储库年龄/a	日历年龄/ Cal a BP	沉积速率/ (cm·ka^-1)
0~1	4 120±30	2 731~3 003	900	0
15~16	4 590±30	3 303~3 592	900	568	28.2
20~21	5 780±30	4 823~5 132	900	2 106	3.9
30~31	7 980±30	7 269~7 496	900	4 509	4.6

深度/ cm	AMS ¹⁴C 年龄/a	日历年龄范围 (1σ)/Cal a BP	碳储库年龄/a	日历年龄/ Cal a BP	沉积速率/ (cm·ka^-1)
0~1	4 120±30	2 731~3 003	900	0
15~16	4 590±30	3 303~3 592	900	568	28.2
20~21	5 780±30	4 823~5 132	900	2 106	3.9
30~31	7 980±30	7 269~7 496	900	4 509	4.6

参数	平均值	范围	参数	平均值	范围
氧化物含量/%			稀土元素含量/10^-6
Al₂O₃	15.18	13.97~15.76	ΣREE	238.31	191.77~201.37
Fe₂O₃	6.67	5.05~7.46	ΣLREE	217.54	170.95~190.35
K₂O	3.14	2.84~3.32	ΣHREE	20.87	19.42~20.03
MgO	2.62	2.04~2.75	ΣLREE/ΣHREE	9.51	8.21~10.47
TiO₂	0.90	0.80~0.94	δCe	0.63	0.62~0.66
CaO	1.61	1.52~1.91	δEu	1.07	1.01~1.08
P₂O₅	0.18	0.17~0.22
MnO	0.11	0.07~0.30
Na₂O	3.65	3.44~3.82

参数	平均值	范围	参数	平均值	范围
氧化物含量/%			稀土元素含量/10^-6
Al₂O₃	15.18	13.97~15.76	ΣREE	238.31	191.77~201.37
Fe₂O₃	6.67	5.05~7.46	ΣLREE	217.54	170.95~190.35
K₂O	3.14	2.84~3.32	ΣHREE	20.87	19.42~20.03
MgO	2.62	2.04~2.75	ΣLREE/ΣHREE	9.51	8.21~10.47
TiO₂	0.90	0.80~0.94	δCe	0.63	0.62~0.66
CaO	1.61	1.52~1.91	δEu	1.07	1.01~1.08
P₂O₅	0.18	0.17~0.22
MnO	0.11	0.07~0.30
Na₂O	3.65	3.44~3.82

参数	各参数间相关系数
参数	ΣREE含量	ΣLREE/ΣHREE	δCe	δEu	(TFe₂O₃+MnO)/Al₂O₃	CIA	Mz	(La/Yb)_N	(Gd/Yb)_N
ΣREE含量	1.00
ΣLREE/ΣHREE	0.79	1.00
δCe	0.15	0.57	1.00
δEu	-0.40	-0.65	-0.71	1.00
(TFe₂O₃+MnO)/Al₂O₃	-0.09	0.43	0.86	-0.66	1.00
CIA	0.58	0.66	0.69	-0.60	0.40	1.00
Mz	-0.39	-0.73	-0.87	0.82	-0.79	-0.67	1.00
(La/Yb)_N	0.84	0.95	0.32	-0.52	0.21	0.50	-0.55	1.00
(Gd/Yb)_N	0.50	0.70	0.46	-0.49	0.31	0.48	-0.55	0.73	1.00