马里亚纳海沟沉积物物源示踪和沉积环境分析

宋子君; 孟凡祎; 李维鼎; 陈琳莹; 罗敏

doi:10.16562/j.cnki.0256-1492.2022031801

马里亚纳海沟沉积物物源示踪和沉积环境分析

上海海洋大学海洋科学学院，上海深渊科学工程技术研究中心，上海 201306

基金项目: 国家自然科学基金面上项目“ 新西兰Hikurangi 俯冲带孔隙流体来源和水岩作用示踪研究：对流体活动和慢滑移事件的指示”（42076057），“马里亚纳海沟和新不列颠海沟深渊海底沉积物孔隙水溶解有机质特征及来源”（42176069）；上海市2021年度“科技创新行动计划”启明星项目“深渊海底沉积物溶解有机质荧光光谱特征研究”（21QA1403700）

详细信息

作者简介: 宋子君（1997—），男，硕士研究生，主要从事海洋地球化学研究，E-mail：1093869284@qq.com

通讯作者: 陈琳莹（1988—），女，助理研究员，主要从事地球化学分析测试方法研究，E-mail：lychen@shou.edu.cn

中图分类号: P736.4

收稿日期: 2022-03-18

修回日期: 2022-05-11

刊出日期: 2022-08-28

Preliminary study on source and sedimentary environment in the Mariana Trench

Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China

More Information

Corresponding author: CHEN Linying, lychen@shou.edu.cn

Received Date: 18 March 2022

Revised Date: 11 May 2022

Publish Date: 28 August 2022

摘要

摘要:
深渊海沟（水深＞6000 m）作为地球表层的最深处，具有特殊的地形地貌和沉积过程，被认为是沉积物最终的汇。通过对采集于马里亚纳海沟南端水深为5800～10954 m的4个站位沉积物开展沉积地球化学研究，旨在揭示不同水深沉积物组成的差异，判别沉积物的来源和沉积环境的变化。主、微量元素含量、Sr-Nd同位素和黏土矿物组成的分析结果显示，马里亚纳海沟不同水深沉积物组成差别较大，整个MBR05和MBR06岩芯8～20 cm范围均发现大量有Ethmodiscus rex (E. rex) 组成的硅藻席沉积(laminated diatom mats, LDMs)。沉积物碎屑组分基本上是陆源风尘端元和火山物质端元的混合，且含有硅藻席沉积物的陆源风尘贡献比例更大，表明大盘筛藻大型成席硅藻的勃发可能与亚洲风尘输入有关。同时，稀土配分模式和Ce异常显示硅藻席形成于次氧化沉积环境，而不含硅藻席沉积物形成于氧化的沉积环境，可能是由于末次盛冰期风尘输入增强，刺激硅藻席勃发后快速堆积至海底，导致有机质矿化增强，进而引起沉积环境的变化。本研究对于认识深渊不同水深沉积物组成的异质性及其对底栖微生物的分布、生态和活动强度的影响有指示意义。
- 锶钕同位素 /
- 黏土矿物 /
- 硅藻席 /
- 物源 /
- 沉积环境 /
- 马里亚纳海沟
Abstract:
Hadal trenches (＞6000 m) represent the deepest parts on the Earth’s surface in unique topography and sedimentary processes, and are considered the final sink of sediments. The strontium (Sr) and neodymium (Nd) isotope compositions and clay-mineral assemblages of the detrital fraction of sediments in the southern Mariana Trench, as well as the concentrations of major and trace elements of bulk sediments at water depths of 5800～10954 m were analyzed to trace the sediment provenance and distinguish the changes in the sedimentary redox conditions. The whole Core MBR05 and the interval of 8～20 cm of Core MBR06 are dominated by valve fragments of the giant diatom Ethmodiscus rex, forming laminated diatom mats (LDMs). Both Sr-Nd isotope compositions and clay-mineral assemblages of the detrital fraction reflect a two-component mixing pattern consisting of Luzon Arc volcanic clastics and Asian aeolian dusts, showing greater aeolian dust contribution on the LDMs, indicating that the bloom of E. rex may be related to Asian aeolian dust input. Meanwhile, the rare earth elements (REEs) distribution pattern and weak or absent Ce anomalies in the LDM point to suboxic conditions during the LGM formation, while the non-LDM samples exhibit vey low to zero enrichment of redox-sensitive elements and negative Ce anomalies, indicating the deposition under oxic bottom-water conditions. It is inferred that changes in sedimentary environments is associated with the enhanced mineralization of organic matter caused by the rapid deposition of E. rex giant diatom. The bloom of E. rex giant diatom may be caused by the enhanced input of wind dust during the Last Glacial Maximum. This study is of relevance for understanding the heterogeneity of sediment composition in different water depths of hadal trench and its impact on the distribution, ecology, and activity intensity of benthic microorganisms in the trench areas.
- Sr-Nd isotope /
- clay minerals /
- LDM /
- sediment sources /
- sedimentary environment /
- Mariana Trench

HTML全文

图 1 沉积物采集站位图

Figure 1.

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图 2 马里亚纳海沟沉积物Mn/Al、Fe/Al、Zn/Al、U/Al、V/Al、Co/Al、Ni/Al比值及SiO₂含量随深度变化图

Figure 2.

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图 3 铁锰与主要氧化还原敏感元素相对上地壳平均富集系数

Figure 3.

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图 4 马里亚纳海沟沉积物澳大利亚太古宙页岩标准化的REE配分模式图

Figure 4.

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图 5 马里亚纳海沟沉积物日历年龄与深度关系

Figure 5.

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图 6 中值粒径与深度变化关系图

Figure 6.

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图 7 马里亚纳海沟沉积物与可能物源源区⁸⁷Sr/⁸⁶Sr-ε_Nd图

Figure 7.

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图 8 各站位锶钕同位素相关性

Figure 8.

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图 9 马里亚纳海沟沉积物及可能源区黏土矿物组成三元图

Figure 9.

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图 10 马里亚纳海沟沉积物Ce元素异常值深度变化曲线

Figure 10.

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图 11 各站位SiO₂含量与Ce异常相关性

Figure 11.

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表 1 沉积物柱样站位信息

Table 1. Detailed information of retrieved sediment cores

站位	纬度	经度	长度/cm	水深/m	位置
MBR02	11°19.62′N	142°11.28′E	18	10954	轴部
MBR04	10°45.66′N	142°16.44′E	24	5800	海盆
MBR05	10°56.52′N	141°46.08′E	70	7000	向海斜坡
MBR06	10°48.78′N	141°10.8′E	40	6530	向海斜坡

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表 1 各站位主量元素值

Table 1. Concentrations of major elements of each site

%
样品名	Al	Na	Mg	P	K	Ca	Ti	Mn	Fe	SiO₂
MBR02-1	6.08	1.38	5.41	0.10	1.37	1.51	0.39	0.45	5.86	51.40
MBR02-3	5.58	1.29	5.12	0.09	1.28	1.38	0.35	0.41	5.48	53.45
MBR02-5	6.06	1.34	5.75	0.09	1.36	1.66	0.40	0.45	6.17	50.27
MBR02-7	5.54	1.28	4.96	0.08	1.24	1.40	0.33	0.39	5.34	54.62
MBR02-9	5.87	1.41	5.22	0.09	1.33	1.45	0.37	0.44	5.63	52.49
MBR02-11	6.23	1.35	5.63	0.10	1.40	1.57	0.40	0.47	6.26	49.95
MBR02-13	5.77	1.38	5.50	0.09	1.25	1.73	0.37	0.45	5.69	52.32
MBR02-15	4.91	1.36	4.37	0.08	1.17	1.24	0.30	2.24	4.76	54.74
MBR02-17	5.33	1.30	4.82	0.09	1.27	1.35	0.34	0.46	5.39	55.04
MBR02-18	5.72	1.47	5.07	0.09	1.31	1.45	0.36	0.43	5.51	52.83
MBR04-2	6.76	1.69	2.71	0.15	1.54	2.06	0.43	2.12	7.39	46.72
MBR04-4	7.34	1.64	2.90	0.16	1.67	2.10	0.46	0.89	7.03	49.04
MBR04-6	7.40	1.58	2.86	0.15	1.73	2.05	0.46	0.89	7.02	49.71
MBR04-8	7.37	1.52	2.86	0.16	1.71	2.12	0.46	0.94	7.09	49.29
MBR04-10	7.12	1.52	2.81	0.16	1.71	2.10	0.47	0.99	7.15	49.93
MBR04-12	7.69	1.54	2.82	0.15	1.70	2.09	0.48	0.94	7.05	48.95
MBR04-14	7.47	1.57	2.88	0.16	1.70	2.01	0.47	0.89	7.10	48.91
MBR04-16	7.50	1.53	2.73	0.15	1.65	2.09	0.48	0.85	7.07	49.48
MBR04-18	8.19	1.56	2.89	0.14	1.77	2.07	0.49	0.81	7.29	47.20
MBR04-20	8.07	1.48	2.85	0.14	1.79	2.03	0.49	0.76	7.25	47.99
MBR04-22	7.91	1.47	2.76	0.14	1.76	1.92	0.48	0.77	7.23	48.35
MBR04-24	7.90	1.62	2.67	0.14	1.76	1.83	0.48	0.74	7.11	48.00
MBR05-2	5.09	2.38	2.28	0.06	1.28	1.12	0.31	0.27	4.30	57.35
MBR05-6	2.31	1.59	1.14	0.03	0.62	0.53	0.14	0.50	1.95	73.31
MBR05-10	2.48	1.61	1.25	0.03	0.65	0.59	0.15	0.34	2.22	71.48
MBR05-14	5.37	2.10	2.52	0.07	1.35	1.28	0.34	0.15	4.73	57.47
MBR05-18	2.72	2.29	1.41	0.04	0.75	0.78	0.19	0.47	2.52	66.18
MBR05-22	3.61	2.33	1.98	0.06	0.99	1.12	0.26	0.28	3.64	61.65
MBR05-26	2.70	2.16	1.34	0.03	0.73	0.63	0.16	0.38	2.32	68.93
MBR05-30	4.03	1.93	1.78	0.05	1.07	0.83	0.24	0.06	3.40	64.95
MBR05-34	2.51	1.13	1.10	0.03	0.67	0.49	0.15	0.14	1.92	75.15
MBR05-38	2.88	0.92	1.26	0.04	0.74	0.61	0.17	0.08	2.48	73.75
MBR05-42	1.38	0.63	0.63	0.02	0.37	0.31	0.08	0.03	1.13	81.36
MBR05-46	3.58	1.20	1.61	0.04	0.97	0.75	0.23	0.11	3.19	69.52
MBR05-50	1.76	1.89	0.94	0.02	0.55	0.41	0.12	0.03	1.49	75.50
MBR05-54	3.36	2.10	1.50	0.04	0.98	0.73	0.22	0.07	3.05	61.49
MBR05-58	1.23	1.06	0.60	0.02	0.36	0.32	0.07	0.46	1.14	80.00
MBR05-62	1.45	0.93	0.71	0.02	0.41	0.35	0.09	0.17	1.63	79.27
MBR05-66	2.05	1.04	0.96	0.02	0.55	0.47	0.12	0.06	1.90	76.59
MBR05-70	1.25	1.05	0.64	0.02	0.36	0.31	0.08	0.09	1.05	80.60
MBR06-2	4.57	2.33	3.33	0.07	1.05	1.95	0.39	0.42	5.48	51.69
MBR06-6	4.76	2.10	3.38	0.08	1.13	1.64	0.36	0.41	5.29	56.47
MBR06-10	3.42	1.81	1.85	0.04	0.88	0.87	0.22	0.15	2.96	68.03
MBR06-14	5.39	2.09	3.14	0.08	1.37	1.48	0.38	0.17	5.42	55.11
MBR06-18	5.18	1.72	2.53	0.07	1.34	1.30	0.34	0.10	4.53	59.91
MBR06-22	5.83	2.23	2.94	0.09	1.51	1.82	0.41	0.11	6.12	47.19
MBR06-26	6.01	2.02	3.13	0.10	1.68	2.01	0.45	1.36	7.01	49.80
MBR06-30	6.02	1.70	3.06	0.11	1.70	2.04	0.48	1.19	7.66	47.70
MBR06-34	6.40	1.88	3.28	0.14	1.62	2.23	0.51	0.76	7.11	47.81
MBR06-38	6.37	1.72	2.93	0.13	1.65	2.17	0.50	0.69	7.29	48.93
MBR06-40	5.82	1.65	2.46	0.13	1.71	2.07	0.48	1.94	6.96	50.78

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表 2 各站位微量元素值

Table 2. Concentrations of trace elements of each site

μg/g
样品名	Co	Ni	Cu	Zn	V	U	Pb	Cr	Ba
MBR02-1	60.34	197.47	188.94	113.57	132.90	1.06	22.96	169.93	182.15
MBR02-3	52.61	181.38	178.27	106.29	131.96	1.02	21.65	154.20	175.06
MBR02-5	54.52	213.83	184.51	119.34	147.59	1.19	23.82	194.55	195.61
MBR02-7	47.42	183.44	164.05	100.43	120.33	1.04	19.59	146.43	167.79
MBR02-9	52.76	213.14	179.71	107.79	136.85	1.20	22.37	149.73	188.44
MBR02-11	56.40	206.55	196.06	115.67	144.17	1.28	24.03	171.16	198.59
MBR02-13	49.99	209.19	170.37	102.34	135.09	1.14	18.50	200.05	168.92
MBR02-15	49.45	192.52	167.88	99.37	132.69	1.12	18.61	200.46	172.02
MBR02-17	46.39	247.44	176.49	95.74	127.90	1.25	18.79	126.25	172.39
MBR02-18	45.96	167.94	162.65	100.31	124.58	1.17	20.31	135.82	177.71
MBR04-2	133.99	272.11	426.86	186.71	177.14	0.73	44.49	103.27	518.43
MBR04-4	52.42	150.42	226.42	138.05	155.57	1.37	30.39	79.22	569.12
MBR04-6	49.23	147.65	224.00	141.81	163.02	1.45	31.46	81.42	563.61
MBR04-8	53.69	150.66	230.78	139.68	165.73	1.43	32.04	77.69	553.97
MBR04-10	49.21	162.54	244.73	141.72	180.01	1.51	32.42	77.62	591.61
MBR04-12	54.55	163.23	235.26	137.41	174.88	1.50	32.59	78.34	582.07
MBR04-14	68.24	154.14	229.26	137.33	173.01	1.54	34.05	86.62	662.49
MBR04-16	47.42	152.70	242.72	134.49	171.48	1.49	32.50	76.65	569.47
MBR04-18	54.17	147.32	239.31	141.31	170.88	1.69	33.04	78.83	713.94
MBR04-20	55.89	133.61	225.54	140.04	174.89	1.64	32.67	79.89	707.11
MBR04-22	49.15	146.92	233.38	150.86	178.26	1.82	36.12	78.83	743.24
MBR04-24	55.30	135.05	220.51	143.08	176.44	1.80	35.72	73.18	760.55
MBR05-2	34.26	77.42	144.94	91.11	96.92	1.03	18.37	67.33	822.05
MBR05-6	32.52	68.48	119.10	48.86	59.74	0.48	11.44	35.99	442.73
MBR05-10	29.65	54.92	106.52	52.23	59.87	0.60	8.84	37.73	490.13
MBR05-14	26.46	67.16	132.44	98.81	99.43	1.13	15.79	75.30	823.96
MBR05-18	51.26	56.59	108.94	56.49	80.52	0.74	15.50	39.42	522.35
MBR05-22	50.15	60.14	123.98	75.10	93.08	0.16	19.19	61.15	565.68
MBR05-26	48.86	54.18	104.69	49.16	69.88	0.74	15.29	38.91	547.38
MBR05-30	16.42	46.45	105.41	72.45	77.34	0.95	11.46	54.15	641.84
MBR05-34	22.10	35.75	78.69	45.95	57.86	0.69	9.70	33.58	483.07
MBR05-38	23.23	39.84	99.75	54.54	64.42	0.76	13.77	38.86	506.45
MBR05-42	8.36	22.59	49.76	27.15	32.20	0.45	5.47	21.49	376.82
MBR05-46	33.84	53.06	121.43	66.67	75.35	0.98	21.19	51.39	488.84
MBR05-50	10.73	31.70	60.56	36.19	47.71	0.25	6.39	35.99	389.47
MBR05-54	15.54	47.52	105.82	67.71	82.29	0.91	15.56	50.18	516.73
MBR05-58	65.57	67.49	111.51	26.93	42.96	0.52	11.63	18.30	328.57
MBR05-62	36.85	34.15	93.61	40.44	39.92	0.49	16.31	20.39	315.99
MBR05-66	16.42	37.94	78.92	43.26	54.16	0.60	12.25	26.70	426.74
MBR05-70	9.95	39.72	67.95	29.48	40.60	0.39	7.10	20.90	334.82
MBR06-2	46.90	132.32	175.67	96.73	135.93	0.50	18.55	81.02	420.03
MBR06-6	48.32	122.41	181.07	98.97	121.75	0.88	15.34	57.82	502.60
MBR06-10	37.65	54.71	107.11	65.51	89.41	0.66	26.93	92.73	677.58
MBR06-14	36.51	96.91	174.51	113.07	126.97	0.25	20.99	67.05	603.16
MBR06-18	50.42	62.77	151.17	96.24	106.20	0.98	24.29	70.97	569.37
MBR06-22	35.05	73.01	161.81	117.25	135.44	1.05	25.67	82.60	486.62
MBR06-26	77.24	207.22	260.88	153.08	163.40	1.20	28.89	78.62	435.12
MBR06-30	54.02	228.85	289.79	138.13	173.10	1.12	29.17	85.36	377.45
MBR06-34	55.74	174.65	227.66	132.76	177.01	1.28	30.11	77.76	387.46
MBR06-38	57.67	171.86	224.86	139.13	171.07	0.32	33.50	84.75	486.05
MBR06-40	57.06	297.23	436.16	156.10	179.55	1.38	24.46	80.22	477.80

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表 3 各站位稀土元素值

Table 3. Concentrations of REEs of each site

μg/g
样品名	La	Ce	Pr	Nd	Sm	Eu	Gd	Tb	Dy	Ho	Er	Tm	Yb	Lu
MBR02-1	22.98	42.39	5.29	22.76	5.15	1.31	5.94	0.86	5.27	1.09	3.11	0.46	3.01	0.44
MBR02-3	22.30	39.43	5.25	21.10	4.86	1.21	5.39	0.78	5.11	1.05	2.91	0.45	2.83	0.43
MBR02-5	23.93	44.28	5.60	22.96	5.22	1.38	5.93	0.88	5.62	1.16	3.20	0.48	3.12	0.47
MBR02-7	20.94	37.53	4.78	21.45	4.69	1.27	5.19	0.82	4.92	1.03	2.69	0.41	2.66	0.39
MBR02-9	23.11	42.12	5.28	22.90	4.95	1.29	5.61	0.84	5.23	1.08	2.96	0.44	2.89	0.43
MBR02-11	23.93	44.29	5.60	24.41	5.11	1.35	5.83	0.89	5.54	1.15	3.05	0.47	3.03	0.45
MBR02-13	22.61	37.93	4.98	23.48	4.88	1.28	5.47	0.87	5.47	1.11	2.91	0.45	2.85	0.43
MBR02-15	21.34	36.72	5.02	22.83	4.81	1.26	5.45	0.87	5.23	1.08	2.93	0.44	2.81	0.43
MBR02-17	19.57	36.89	4.52	20.56	4.25	1.11	4.66	0.75	4.48	0.93	2.51	0.39	2.47	0.37
MBR02-18	20.82	38.46	4.75	22.00	4.45	1.14	5.10	0.78	4.76	0.97	2.65	0.40	2.66	0.40
MBR04-2	35.48	64.65	9.90	44.28	10.09	2.57	10.94	1.78	10.27	2.12	5.80	0.90	5.71	0.83
MBR04-4	35.57	57.18	9.77	43.84	10.06	2.63	10.88	1.76	10.57	2.18	6.02	0.94	5.86	0.85
MBR04-6	33.64	58.55	9.57	42.73	10.02	2.62	11.05	1.71	10.67	2.19	6.00	0.91	5.78	0.85
MBR04-8	35.06	54.35	10.29	44.41	10.41	2.71	10.93	1.76	11.10	2.27	6.15	0.94	6.21	0.90
MBR04-10	36.23	56.16	10.64	45.31	10.91	2.72	11.64	1.78	11.14	2.29	6.25	0.96	6.15	0.94
MBR04-12	36.07	58.51	10.07	44.93	10.67	2.69	11.57	1.79	11.05	2.28	6.15	0.95	6.03	0.90
MBR04-14	34.02	57.74	10.22	44.55	10.36	2.60	11.43	1.79	10.91	2.27	6.10	0.93	6.11	0.92
MBR04-16	35.69	51.51	10.11	45.14	10.70	2.78	11.74	1.83	11.16	2.31	6.13	0.95	6.28	0.92
MBR04-18	39.28	61.77	10.98	48.02	10.87	2.86	11.72	1.84	11.38	2.37	6.33	0.98	6.18	0.92
MBR04-20	37.48	61.96	10.60	44.96	10.50	2.71	11.32	1.80	10.87	2.26	6.20	0.94	6.02	0.90
MBR04-22	38.71	64.55	11.04	50.74	11.27	2.85	11.89	1.91	12.34	2.40	6.75	1.02	6.39	0.96
MBR04-24	37.00	62.63	10.41	47.74	10.29	2.77	11.53	1.82	11.31	2.32	6.23	0.96	6.21	0.91
MBR05-2	20.15	44.04	4.89	20.80	4.40	1.32	4.88	0.78	4.54	0.95	2.57	0.40	2.48	0.37
MBR05-6	9.95	26.57	2.34	10.38	2.06	0.58	2.28	0.35	2.11	0.49	1.20	0.18	1.17	0.17
MBR05-10	11.02	25.19	2.58	11.75	2.38	0.68	2.78	0.41	2.51	0.53	1.38	0.22	1.39	0.20
MBR05-14	19.51	45.10	4.89	21.12	4.49	1.31	5.16	0.81	4.84	1.01	2.77	0.43	2.80	0.40
MBR05-18	11.44	32.99	2.74	11.80	2.59	0.75	2.84	0.43	2.69	0.53	1.48	0.23	1.46	0.22
MBR05-22	18.47	37.59	4.36	19.56	4.16	1.19	4.83	0.74	4.44	0.94	2.54	0.38	2.37	0.33
MBR05-26	11.90	34.65	2.73	12.50	2.55	0.73	2.83	0.42	2.57	0.51	1.42	0.21	1.37	0.20
MBR05-30	16.47	43.02	3.83	17.87	3.67	1.02	4.12	0.62	3.81	0.78	2.12	0.32	2.13	0.32
MBR05-34	8.72	24.02	1.92	8.02	1.80	0.53	2.08	0.33	1.99	0.41	1.14	0.18	1.14	0.17
MBR05-38	10.56	28.33	2.42	10.52	2.24	0.65	2.61	0.41	2.55	0.52	1.44	0.23	1.47	0.21
MBR05-42	5.46	15.10	1.31	5.53	1.16	0.32	1.29	0.20	1.19	0.24	0.65	0.10	0.66	0.10
MBR05-46	11.35	35.98	2.83	12.04	2.66	0.79	2.84	0.47	2.97	0.60	1.69	0.27	1.73	0.26
MBR05-50	6.10	20.88	1.52	6.50	1.50	0.37	1.72	0.26	1.60	0.32	0.89	0.14	0.88	0.13
MBR05-54	11.00	32.81	3.04	13.26	2.94	0.84	3.29	0.53	3.32	0.65	1.85	0.28	1.81	0.27
MBR05-58	6.56	25.78	1.49	6.66	1.36	0.34	1.47	0.22	1.28	0.25	0.69	0.10	0.64	0.10
MBR05-62	7.37	24.10	1.71	7.28	1.52	0.38	1.61	0.25	1.48	0.29	0.81	0.12	0.78	0.11
MBR05-66	7.40	22.85	1.93	8.41	1.84	0.49	1.96	0.31	1.81	0.36	1.00	0.15	0.99	0.14
MBR05-70	4.70	14.89	1.18	4.98	1.13	0.26	1.21	0.18	1.09	0.21	0.59	0.09	0.57	0.08
MBR06-2	15.83	40.29	4.30	19.41	4.45	1.18	5.18	0.80	5.06	1.01	2.80	0.43	2.74	0.40
MBR06-6	19.26	38.59	4.77	22.19	4.71	1.29	5.31	0.86	5.31	1.06	2.91	0.44	2.84	0.43
MBR06-10	13.51	36.08	3.40	14.91	3.30	0.87	3.32	0.55	3.31	0.67	1.82	0.28	1.74	0.26
MBR06-14	21.64	43.69	5.79	23.47	5.44	1.57	5.50	0.97	5.78	1.15	3.15	0.47	2.92	0.41
MBR06-18	20.59	45.08	5.48	22.64	5.06	1.42	4.95	0.88	5.20	1.04	2.84	0.45	2.85	0.42
MBR06-22	27.41	49.89	7.11	30.14	6.92	1.94	7.23	1.21	7.05	1.46	4.01	0.62	3.90	0.59
MBR06-26	28.63	51.56	7.45	31.22	7.35	1.93	7.79	1.29	7.80	1.60	4.32	0.67	4.34	0.64
MBR06-30	28.43	47.15	7.64	31.66	7.42	1.93	7.89	1.32	8.12	1.67	4.57	0.71	4.52	0.67
MBR06-34	30.76	46.48	8.39	33.60	8.38	2.21	8.87	1.52	9.48	1.89	5.15	0.82	5.22	0.75
MBR06-38	29.37	43.11	8.36	33.88	8.33	2.13	8.51	1.53	9.13	1.83	5.04	0.77	4.73	0.71
MBR06-40	28.83	52.43	8.88	37.17	8.93	2.42	9.72	1.56	9.51	1.95	5.46	0.83	5.17	0.78

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表 2 马里亚纳海沟总有机碳放射性¹⁴C定年结果

Table 2. Total organic carbon AMS-¹⁴C dating results of the Mariana Trench sediments

样品编号	深度 /cm	放射性¹⁴C年龄 /aBP	校正后日历年龄 /cal.aBP
MBR02-1	1	3 040±25	2 664±25
MBR02-5	5	3 675±30	3 421±30
MBR02-12	12	3 780±30	3 544±30
MBR02-18	18	3 615±30	3 352±30
MBR04-2	2	6 600±40	6 886±40
MBR04-10	10	10 960±60	12 285±60
MBR04-18	18	16 290±180	18 798±180
MBR04-24	24	16 040±130	18 517±130
MBR05-2	2	12 690±120	14 206±120
MBR05-10	10	10 590±90	11 703±90
MBR05-22	22	12 810±70	14 394±70
MBR05-44	44	16 950±130	19 559±130
MBR05-68	68	11 720±80	13 037±80
MBR06-2	2	6 095±40	6 327±40
MBR06-10	10	11 730±150	13 049±150
MBR06-18	18	15 240±150	17 630±150
MBR06-22	22	15 610±160	18 063±160
MBR06-40	40	14 300±140	16 473±140

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表 4 各站位Sr-Nd同位素及含量

Table 4. Sr-Nd isotope and the concentrations in each site


样品名	⁸⁷Sr/⁸⁶Sr	¹⁴³Nd//¹⁴⁴Nd	Sr含量/(μg/g)	Nd含量/(μg/g)
MBR02-2	0.7094	0.5125	135.07	21.10
MBR02-7	0.7086	0.5125	124.48	21.45
MBR02-12	0.7081	0.5125	139.06	23.48
MBR02-18	0.7089	0.5124	125.95	22.00
MBR04-4	0.7082	0.5124	205.77	43.84
MBR04-10	0.7083	0.5124	211.84	45.31
MBR04-18	0.7085	0.5124	222	48.02
MBR04-24	0.7087	0.5124	225.25	47.74
MBR05-2	0.7094	0.5124	132.55	20.8
MBR05-10	0.7098	0.5124	74.75	11.75
MBR05-24	0.7097	0.5124	113.28	19.56
MBR05-44	0.7094	0.5124	86.18	12.04
MBR05-68	0.7096	0.5124	38.67	4.98
MBR06-2	0.7075	0.5125	128.71	19.41
MBR06-10	0.7090	0.5124	88.07	14.91
MBR06-18	0.7093	0.5124	125.72	22.64
MBR06-26	0.7082	0.5124	182.9	31.22
MBR06-40	0.7086	0.5125	208.78	37.17

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表 5 各站位黏土矿物含量

Table 5. Clay mineral composition and relevant parameters in each site

样品名	蒙脱石/%	伊利石/%	高岭石/%	绿泥石/%
MBR05-6	64.5	13.1	4.5	17.8
MBR05-14	73.9	12.1	2.7	11.2
MBR05-26	71.9	14.7	3.4	10.0
MBR05-46	68.5	18.1	2.9	10.5
MBR05-70	79.5	10.8	2.1	7.5
MBR06-2	88.7	3.9	1.9	5.5
MBR06-10	74.5	11.5	2.5	11.5
MBR06-18	82.0	6.9	0.9	10.1
MBR06-26	77.9	8.6	1.4	12.1
MBR06-40	75.3	6.1	1.6	17.0

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表 6 各站位沉积物平均粒度及组成

Table 6. Average grain size of sediments and relative fractions at each site

编号	平均粒径/μm	中值粒径/μm	黏土含量/%	粉砂含量/%	砂含量/%
MBR02-2	9.28	6.15	34.89	65.11	0.00
MBR02-3	10.9	6.87	32.42	65.75	1.82
MBR02-4	9.36	6.48	34.41	65.59	0.00
MBR02-5	9.82	6.81	31.21	68.79	0.00
MBR02-6	12.5	8.8	24.17	75.22	0.00
MBR02-7	11.72	6.55	33.47	63.88	0.00
MBR02-8	10.77	7.11	30.81	69.14	0.00
MBR02-9	10.32	7.89	27.87	72.13	0.00
MBR02-10	11.78	8.78	24.94	71.26	0.00
MBR02-11	11.83	8.37	26.55	73.44	0.00
MBR02-12	14.61	10.02	22.6	76.82	0.55
MBR02-13	9.25	5.50	40.04	59.84	0.12
MBR02-14	8.62	5.71	37.85	62.15	0.00
MBR02-15	9.04	6.44	32.76	67.24	0.00
MBR02-16	10.54	7.5	27.71	72.29	0.00
MBR02-17	10.76	7.01	31.02	68.92	0.06
MBR02-18	10.28	6.9	31.42	67.86	0.02
MBR04-2	36.01	9.77	24.92	65.94	9.14
MBR04-4	17.34	7.35	30.55	63.00	6.45
MBR04-6	19.73	8.67	26.81	65.04	8.15
MBR04-8	21.13	8.09	31.16	60.47	8.37
MBR04-10	28.73	12.00	21.15	66.41	12.44
MBR04-12	20.09	8.38	29.02	63.70	7.28
MBR04-16	17.79	8.21	26.36	66.75	6.89
MBR04-18	14.10	6.55	31.72	62.83	5.46
MBR04-20	21.07	10.53	22.02	71.19	6.79
MBR04-22	21.95	12.56	18.82	74.00	7.18
MBR04-24	12.68	6.55	33.46	63.67	2.86

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马里亚纳海沟沉积物物源示踪和沉积环境分析

上海海洋大学海洋科学学院，上海深渊科学工程技术研究中心，上海 201306

作者简介: 宋子君（1997—），男，硕士研究生，主要从事海洋地球化学研究，E-mail：1093869284@qq.com

通讯作者: 陈琳莹（1988—），女，助理研究员，主要从事地球化学分析测试方法研究，E-mail：lychen@shou.edu.cn

Preliminary study on source and sedimentary environment in the Mariana Trench

Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China

Corresponding author: CHEN Linying, lychen@shou.edu.cn

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