Clay mineral characteristics of sediments in the seamount basin of the Western Pacific and its indicative significance

doi:10.3969/j.issn.1001-909X.2023.03.006

Abstract

Abstract:

The clay mineral assemblage in abyssal sediments can reflect the paleoclimate and paleoenvironment changes of the provenance area. Predecessors have many studies about the characteristics of clay mineral assemblages in the Pacific sediments west of the Mariana Trench, but the less research on the characteristics of clay mineral assemblages in the east of the Mariana Trench limits a deeper understanding of the relationship between the Asian aeolian dust input and the Pacific deep-sea sedimentary environment. In this study, 31 surface samples and 1 core sample collected in the Malkus-Wake Seamount area of the Western Pacific during the 2019 DY54 cruise were analyzed for clay minerals, combined with the data collected in the Western Pacific and nearby areas, we discussed the characteristics of composition, distribution and the provenance of clay minerals. The results showed that illite was the main clay mineral in surface sediments of the study area, with an average value of 69%; the content of chlorite and kaolinite were the second, with an average of 16% and 11% respectively; that of smectite was the least, with an average of 3%. In the core P04, the assemblage of the clay mineral was basically the same as surface samples, but below 250 cm depth, the content of smectite increased significantly, while the content of illite decreased relatively. Provenance analysis showed that Asian aeolian dust was the main source of illite in the study area, and kaolinite and chlorite might also be from Asian aeolian dust, and the East Asian winter monsoon was the main transport force of these clay minerals. The smectite in sediments could be mainly formed by weathering of submarine volcanic materials. The increase of illite content while the decrease of smectite content in the upper layer of core P04 sediment was responded to the increase of Asian aeolian dust input since the Middle Pleistocene.

Key words: Western Pacific, clay minerals, aeolian deposition, provenance

CLC Number:

P736.3

DENG Tao, XU Dong, XIAO Tinglu, YE Liming, ZHANG Weiyan. Clay mineral characteristics of sediments in the seamount basin of the Western Pacific and its indicative significance[J]. Journal of Marine Sciences, 2023, 41(3): 56-72.

Figures/Tables 14

References 63

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站位	经度	纬度	黏土矿物含量/%				伊利石化学指数	伊利石结晶度指数
站位	经度	纬度	蒙脱石	伊利石	高岭石	绿泥石	伊利石化学指数	伊利石结晶度指数
P01	160.30°E	23.00°N	3	69	11	17	0.41	0.31
P02	160.30°E	22.19°N	2	70	11	16	0.37	0.29
P03	160.30°E	21.38°N	2	71	12	15	0.34	0.30
P04	160.30°E	20.54°N	4	67	13	15	0.38	0.28
P05	160.26°E	19.71°N	1	75	12	12	0.27	0.36
P06	160.30°E	18.90°N	11	61	10	17	0.41	0.29
P07	161.15°E	23.03°N	2	70	13	16	0.37	0.29
P08	161.12°E	22.18°N	8	66	9	17	0.43	0.28
P09	161.12°E	21.36°N	4	70	12	14	0.37	0.30
P10	161.29°E	20.48°N	3	72	11	15	0.36	0.30
P11	161.12°E	19.72°N	6	67	10	17	0.42	0.29
P12	161.15°E	18.93°N	4	69	10	18	0.39	0.30
P13	161.94°E	23.00°N	3	69	12	16	0.37	0.28
P14	161.94°E	22.18°N	3	69	12	15	0.37	0.28
P15	161.95°E	21.37°N	3	70	10	17	0.40	0.30
P16	161.94°E	20.54°N	3	70	12	16	0.35	0.29
P17	161.91°E	19.68°N	2	75	10	13	0.32	0.38
P18	161.89°E	18.89°N	7	66	12	15	0.39	0.28
P19	162.81°E	23.00°N	2	71	11	16	0.36	0.29
P20	162.76°E	22.18°N	3	70	10	18	0.38	0.28
P21	162.76°E	21.42°N	2	71	12	15	0.37	0.29
P22	162.76°E	20.52°N	2	71	12	15	0.38	0.29
P23	162.76°E	19.72°N	3	69	12	16	0.40	0.30
P24	162.76°E	18.90°N	3	67	10	20	0.41	0.27
P25	163.58°E	23.00°N	1	70	12	17	0.38	0.29
P26	163.58°E	22.18°N	5	67	12	16	0.37	0.29
P27	163.58°E	21.35°N	4	70	11	15	0.36	0.28
P31	164.40°E	23.00°N	2	70	12	16	0.36	0.27
P32	164.40°E	22.18°N	5	69	9	18	0.39	0.30
P33	165.22°E	23.00°N	2	70	9	19	0.40	0.30
P35	166.04°E	23.00°N	1	73	8	18	0.38	0.31

站位	经度	纬度	黏土矿物含量/%				伊利石化学指数	伊利石结晶度指数
站位	经度	纬度	蒙脱石	伊利石	高岭石	绿泥石	伊利石化学指数	伊利石结晶度指数
P01	160.30°E	23.00°N	3	69	11	17	0.41	0.31
P02	160.30°E	22.19°N	2	70	11	16	0.37	0.29
P03	160.30°E	21.38°N	2	71	12	15	0.34	0.30
P04	160.30°E	20.54°N	4	67	13	15	0.38	0.28
P05	160.26°E	19.71°N	1	75	12	12	0.27	0.36
P06	160.30°E	18.90°N	11	61	10	17	0.41	0.29
P07	161.15°E	23.03°N	2	70	13	16	0.37	0.29
P08	161.12°E	22.18°N	8	66	9	17	0.43	0.28
P09	161.12°E	21.36°N	4	70	12	14	0.37	0.30
P10	161.29°E	20.48°N	3	72	11	15	0.36	0.30
P11	161.12°E	19.72°N	6	67	10	17	0.42	0.29
P12	161.15°E	18.93°N	4	69	10	18	0.39	0.30
P13	161.94°E	23.00°N	3	69	12	16	0.37	0.28
P14	161.94°E	22.18°N	3	69	12	15	0.37	0.28
P15	161.95°E	21.37°N	3	70	10	17	0.40	0.30
P16	161.94°E	20.54°N	3	70	12	16	0.35	0.29
P17	161.91°E	19.68°N	2	75	10	13	0.32	0.38
P18	161.89°E	18.89°N	7	66	12	15	0.39	0.28
P19	162.81°E	23.00°N	2	71	11	16	0.36	0.29
P20	162.76°E	22.18°N	3	70	10	18	0.38	0.28
P21	162.76°E	21.42°N	2	71	12	15	0.37	0.29
P22	162.76°E	20.52°N	2	71	12	15	0.38	0.29
P23	162.76°E	19.72°N	3	69	12	16	0.40	0.30
P24	162.76°E	18.90°N	3	67	10	20	0.41	0.27
P25	163.58°E	23.00°N	1	70	12	17	0.38	0.29
P26	163.58°E	22.18°N	5	67	12	16	0.37	0.29
P27	163.58°E	21.35°N	4	70	11	15	0.36	0.28
P31	164.40°E	23.00°N	2	70	12	16	0.36	0.27
P32	164.40°E	22.18°N	5	69	9	18	0.39	0.30
P33	165.22°E	23.00°N	2	70	9	19	0.40	0.30
P35	166.04°E	23.00°N	1	73	8	18	0.38	0.31