Effects of biocomponent on the geotechnical properties of seafloor surface sediments in the Western Pacific Warm Pool

doi:10.13745/j.esf.sf.2021.5.2

Abstract

Abstract:

The Western Pacific Warm Pool (WPWP) is located in the tropical western Pacific and the eastern Indian Ocean with an average annual surface water temperature of over 28 ℃. Due to the varying depositional environments under different tectonic settings, the biocomponent contents in pelagic sediments of the WPWP differ greatly. Biocomponents have a significant impact on the geotechnical properties of deep-see sediments, however, the correlation between the two has not been studied previously. To fill this gap, we investigated the geotechnical properties of surface sediments in the core of the WPWP and identified the sediment components under microscope. As results show, the natural moisture content ranges from 61.1% to 435.1%, natural density from 1.04 to 1.76 g/cm³, penetration resistance from 0 to 100 kPa, and vane shear strength from 0 to 8.6 kPa. The high natural moisture content, low natural density, and low shear strength are consistent with the characteristics of typical geotechnical properties of deep-sea sediment. Calcareous sediments of the Western Carolingian ridge, seamounts and other areas with water depths less than the CCD (Carbonate Compensation Depth) generally contain more than 50% calcareous biocomponents, and the same proportion of siliceous biocomponents is likely found in siliceous sediments of the southwestern Western Carolingian trough and surrounding deep trench areas; whereas clay sediments mainly distribute in the Western Carolingian basin. With decreasing calcareous and increasing siliceous biocomponents, the surface sediment varies from calcareous to clay to siliceous and its natural moisture content increases while its natural density, penetration resistance and vane shear strength decrease. It suggests that the geotechnical properties of deep-sea surface sediment are correlated with the contents of biocomponents—specifically, its penetration resistance, vane shear strength and natural density are positively influenced by calcareous biocomponents and negatively influenced by siliceous biocomponents, while the opposite holds true for natural moisture content. This paper establishes the relationship between biocomponent and geotechnical properties of abyssal sediments, and proposes a fitting formula between the biocomponent content and geotechnical properties, which is useful for evaluating the geotechnical properties of deep-sea sediments.

Key words: deep-sea surface sediment, biocomponent, natural moisture content, natural density, penetration resistance, vane shear strength

CLC Number:

P67
P736.2

ZHOU Shang, XU Jishang, LIU Yong, LI Guangxue, LI Anlong, CAO Lihua, ZHAI Ke, XU Jizheng, QUAN Yongzheng. Effects of biocomponent on the geotechnical properties of seafloor surface sediments in the Western Pacific Warm Pool[J]. Earth Science Frontiers, 2022, 29(5): 119-132.

Figures/Tables 15

References 36

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沉积物类型	天然含水率/%			天然密度/(g·cm^-3)				十字板剪切强度/kPa				贯入阻力/kPa
沉积物类型	范围	平均值			范围	平均值			范围	平均值			范围		平均值
含硅质的黏土	146.7~208.5		179.7	1.11~1.24			1.17	0			0	0		0
含硅质和钙质的黏土	156.2~198.0		178.4	1.28~1.34			1.30	3.0~3.6			2.2	20~30		17
钙质黏土	183.6~226.6		203.2	1.23~1.33			1.27	0~4.6			1.5	0~30		10
硅质黏土	224.5~289.3		260.0	1.04~1.22			1.16	0			0	0		0
含硅质的钙质黏土	143.8~277.9		226.2	1.18~1.32			1.25	0.8~3.2			2.2	0~20		4
含钙质的硅质黏土	230.5~343.8		279.9	1.15~1.26			1.20	0~1.6			0.8	0		0
钙质软泥	61.1~117.1		92.7	1.10~1.60			1.45	0~6.4			5.0	40~90		69
含硅质的钙质软泥	99.9~114.6		106.7	1.51~1.54			1.53	0~6.4			4.9	40~90		80
含黏土的钙质软泥	88.9~180.5		109.1	1.36~1.76			1.50	0~8.6			4.8	28~100		68
含黏土和硅质的钙质软泥	86.9~212.8		122.2	1.27~1.51			1.39	0~7.2			3.8	0~80		41
黏土钙质软泥	123.7~214.6		153.7	1.11~1.47			1.27	0~4			2	0~40		18
含黏土的硅质钙质软泥	184.7~333.7		239.2	1.08~1.28			1.21	0~2.2			1.5	0~20		7
含硅质的黏土钙质软泥	110.7~228.8		161.3	1.16~1.43			1.34	0~4.8			2.5	0~50		20
黏土硅质钙质软泥	115.4~254.7		186.1	1.10~1.43			1.28	0~3.4			1.1	0~30		10
硅质软泥	375.2~435.1		400.9	1.05~1.11			1.08	0			0	0		0
黏土硅质软泥	338.9~406.2		362.8	1.09~1.16			1.13	0~1.2			0.4	0		0
含黏土的钙质硅质软泥	208.6		208.6	1.24			1.24	1.2			1.2	0		0
黏土钙质硅质软泥	110.0~294.6		202.3	1.14~1.32			1.23	0~2.4			1.2	0		0

沉积物类型	天然含水率/%			天然密度/(g·cm^-3)				十字板剪切强度/kPa				贯入阻力/kPa
沉积物类型	范围	平均值			范围	平均值			范围	平均值			范围		平均值
含硅质的黏土	146.7~208.5		179.7	1.11~1.24			1.17	0			0	0		0
含硅质和钙质的黏土	156.2~198.0		178.4	1.28~1.34			1.30	3.0~3.6			2.2	20~30		17
钙质黏土	183.6~226.6		203.2	1.23~1.33			1.27	0~4.6			1.5	0~30		10
硅质黏土	224.5~289.3		260.0	1.04~1.22			1.16	0			0	0		0
含硅质的钙质黏土	143.8~277.9		226.2	1.18~1.32			1.25	0.8~3.2			2.2	0~20		4
含钙质的硅质黏土	230.5~343.8		279.9	1.15~1.26			1.20	0~1.6			0.8	0		0
钙质软泥	61.1~117.1		92.7	1.10~1.60			1.45	0~6.4			5.0	40~90		69
含硅质的钙质软泥	99.9~114.6		106.7	1.51~1.54			1.53	0~6.4			4.9	40~90		80
含黏土的钙质软泥	88.9~180.5		109.1	1.36~1.76			1.50	0~8.6			4.8	28~100		68
含黏土和硅质的钙质软泥	86.9~212.8		122.2	1.27~1.51			1.39	0~7.2			3.8	0~80		41
黏土钙质软泥	123.7~214.6		153.7	1.11~1.47			1.27	0~4			2	0~40		18
含黏土的硅质钙质软泥	184.7~333.7		239.2	1.08~1.28			1.21	0~2.2			1.5	0~20		7
含硅质的黏土钙质软泥	110.7~228.8		161.3	1.16~1.43			1.34	0~4.8			2.5	0~50		20
黏土硅质钙质软泥	115.4~254.7		186.1	1.10~1.43			1.28	0~3.4			1.1	0~30		10
硅质软泥	375.2~435.1		400.9	1.05~1.11			1.08	0			0	0		0
黏土硅质软泥	338.9~406.2		362.8	1.09~1.16			1.13	0~1.2			0.4	0		0
含黏土的钙质硅质软泥	208.6		208.6	1.24			1.24	1.2			1.2	0		0
黏土钙质硅质软泥	110.0~294.6		202.3	1.14~1.32			1.23	0~2.4			1.2	0		0

r(Pearson 相关性)	天然密度/(g·cm^-3)	天然含水率/%	十字板剪切强度/kPa	贯入阻力/kPa
钙质生物组分	0.74	-0.83	0.68	0.68
硅质生物组分	-0.63	0.81	-0.58	-0.51

r(Pearson 相关性)	天然密度/(g·cm^-3)	天然含水率/%	十字板剪切强度/kPa	贯入阻力/kPa
钙质生物组分	0.74	-0.83	0.68	0.68
硅质生物组分	-0.63	0.81	-0.58	-0.51