Carbon and oxygen isotopic characteristics of benthic foraminifera in the Okinawa Trough since MIS6 and their palaeoceanographical significance

doi:10.13745/j.esf.sf.2022.1.14

Abstract

Abstract:

Based on the stratigraphic age framework constructed by AMS¹⁴C ages and benthic foraminiferal oxygen isotopic analysis, the δ¹³C characteristics of benthic foraminifera and their palaeoceanographical significance were analyzed for core CHHC-15 in central and northern Okinawa Trough since marine isotope stage 6 (MIS6) around 200 ka BP. According to the results, the δ¹³C negative deviation in MIS4 and MIS 6 and positive deviation in MIS1, MIS3 and MIS5 mainly reflect the changes in surface primary productivity and organic matter flux during glacial-interglacial cycles; whilst the δ¹³C positive deviation in MIS2 indicates NPIW incursion into the Okinawa Trough since the LGM which resulted in enhanced ventilation and weak oxidation of the bottom water. The large δ¹³C negative deviation in MIS4 is likely caused by methane anaerobic oxidation (AOM).

Key words: paleoceanographical implication, carbon and oxygen isotope, benthic foraminifera, MIS6 stage, the Okinawa Trough

CLC Number:

P597

DOU Yanguang, LI Qing, WU Yonghua, ZHAO Jingtao, SUN Chenghui, CAI Feng, CHEN Xiaohui, ZHANG Yong, FAN Jiahui, SHI Xuefa. Carbon and oxygen isotopic characteristics of benthic foraminifera in the Okinawa Trough since MIS6 and their palaeoceanographical significance[J]. Earth Science Frontiers, 2022, 29(4): 84-92.

Figures/Tables 7

References 56

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编号	深度/cm	属种	AMS ¹⁴C年龄/a B.P.	校正年龄/cal a B.P.
Z1-S2	38~39	N.dutertrei	1 210±30	755(840~670)
Z1-S4	88~89	N.dutertrei	2 840±30	2 596(2 706~2 485)
Z1-S6	138~139	N.dutertrei	4 140±30	4 209(4 328~4 090)
Z1-S12	288~289	N.dutertrei	9 960±50	10 927(11 105~10 749)
Z1-S14	338~339	N.dutertrei	11 080±30	12 619(12 696~12 543)
Z1-S16	388~389	N.dutertrei	13 150±40	15 185(15 330~15 040)
Z1-S24	588~589	N.dutertrei	16 950±50	19 951(20 153~19 749)
Z1-S26	638~639	N.dutertrei	17 690±50	20 847(21 044~20 650)
Z1-S32	788~789	N.dutertrei	19 770±60	23 308(23 561~23 055)
Z1-S36	888~889	N.dutertrei	19 970±70	23 578(23 850~23 306)
Z1-S42	1 038~1 039	N.dutertrei	23 560±90	27 445(27 645~27 245)
Z1-S44	1 088~1 089	N.dutertrei	24 620±100	28 255(28 565~27 945)
Z1-S46	1 138~1 139	N.dutertrei	24 870±100	28 504(28 767~28 240)
Z1-S48	1 178~1 179	N.dutertrei	26 090±110	29 879(30 293~29 465)
Z1-S52	1 288~1 289	N.dutertrei	27 910±170	31 325(31 584~31 065)
Z1-S54	1 338~1 389	N.dutertrei	28 760±140	32 247(32 803~31 690)
Z1-S56	1 388~1 389	N.dutertrei	31 520±180	35 504(35 439~34 631)
Z1-S59	1 463~1 464	N.dutertrei	33 760±280	37 588(38 450~36 725)

编号	深度/cm	属种	AMS ¹⁴C年龄/a B.P.	校正年龄/cal a B.P.
Z1-S2	38~39	N.dutertrei	1 210±30	755(840~670)
Z1-S4	88~89	N.dutertrei	2 840±30	2 596(2 706~2 485)
Z1-S6	138~139	N.dutertrei	4 140±30	4 209(4 328~4 090)
Z1-S12	288~289	N.dutertrei	9 960±50	10 927(11 105~10 749)
Z1-S14	338~339	N.dutertrei	11 080±30	12 619(12 696~12 543)
Z1-S16	388~389	N.dutertrei	13 150±40	15 185(15 330~15 040)
Z1-S24	588~589	N.dutertrei	16 950±50	19 951(20 153~19 749)
Z1-S26	638~639	N.dutertrei	17 690±50	20 847(21 044~20 650)
Z1-S32	788~789	N.dutertrei	19 770±60	23 308(23 561~23 055)
Z1-S36	888~889	N.dutertrei	19 970±70	23 578(23 850~23 306)
Z1-S42	1 038~1 039	N.dutertrei	23 560±90	27 445(27 645~27 245)
Z1-S44	1 088~1 089	N.dutertrei	24 620±100	28 255(28 565~27 945)
Z1-S46	1 138~1 139	N.dutertrei	24 870±100	28 504(28 767~28 240)
Z1-S48	1 178~1 179	N.dutertrei	26 090±110	29 879(30 293~29 465)
Z1-S52	1 288~1 289	N.dutertrei	27 910±170	31 325(31 584~31 065)
Z1-S54	1 338~1 389	N.dutertrei	28 760±140	32 247(32 803~31 690)
Z1-S56	1 388~1 389	N.dutertrei	31 520±180	35 504(35 439~34 631)
Z1-S59	1 463~1 464	N.dutertrei	33 760±280	37 588(38 450~36 725)