冲绳海槽MIS6期以来底栖有孔虫碳氧同位素特征及其古海洋指示意义

doi:10.13745/j.esf.sf.2022.1.14

地学前缘 ›› 2022, Vol. 29 ›› Issue (4): 84-92.DOI: 10.13745/j.esf.sf.2022.1.14

冲绳海槽MIS6期以来底栖有孔虫碳氧同位素特征及其古海洋指示意义

窦衍光¹^,²(), 李清¹^,⁴, 吴永华²^,³, 赵京涛¹^,⁴, 孙呈慧¹, 蔡峰¹^,⁴, 陈晓辉¹^,⁴, 张勇¹^,⁴, 范佳慧¹, 石学法²^,³

1.中国地质调查局青岛海洋地质研究所, 山东青岛 266237
2.青岛海洋科学与技术试点国家实验室海洋地质过程与环境功能实验室, 山东青岛 266061
3.自然资源部第一海洋研究所自然资源部海洋地质与成矿作用重点实验室, 山东青岛 266061
4.青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室, 山东青岛 266237

收稿日期:2021-10-07 修回日期:2021-11-27 出版日期:2022-07-25 发布日期:2022-07-28
作者简介:窦衍光(1979—),男,博士,研究员,从事海洋沉积地球化学研究。E-mail: douyanguang@gmail.com
基金资助:
国家自然科学基金项目(41776077);国家自然科学基金项目(41306062);国家自然科学基金项目(42176078);中国地质调查局地质调查专项(DD20190205);国家海洋局国际合作项目(GEOGEO04)

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

DOU Yanguang¹^,²(), LI Qing¹^,⁴, WU Yonghua²^,³, ZHAO Jingtao¹^,⁴, SUN Chenghui¹, CAI Feng¹^,⁴, CHEN Xiaohui¹^,⁴, ZHANG Yong¹^,⁴, FAN Jiahui¹, SHI Xuefa²^,³

1. Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
2. Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China
3. Key Laboratory of Marine Geology and Metallogeny, First Institute of Marine Geology, MNR, Qingdao 266061, China
4. Laboratory for Marine Mineral Resource, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China

Received:2021-10-07 Revised:2021-11-27 Online:2022-07-25 Published:2022-07-28

摘要/Abstract

摘要：

基于AMS ¹⁴C年龄和底栖有孔虫氧同位素建立的地层年代框架,重点探讨了冲绳海槽中北部CSHC-15孔MIS6期以来(约200 ka)底栖有孔虫δ¹³C特征及其古海洋指示意义。结果显示,冰期-间冰期表层初级生产力和有机质通量的变化是导致底栖有孔虫δ¹³C值在MIS4和MIS6期负偏而在MIS1、MIS3和MIS5期正偏的主要原因。MIS2期的底栖有孔虫δ¹³C正偏,指示了NPIW侵入冲绳海槽,导致通风性加强,底层水呈弱氧化状态。甲烷渗漏引发的甲烷厌氧氧化作用(AOM)是导致CSHC-15孔底栖有孔虫在MIS4期碳同位素大幅负偏的原因。

关键词: 古海洋意义, 碳氧同位素, 底栖有孔虫, MIS6期, 冲绳海槽

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

中图分类号:

P597

窦衍光, 李清, 吴永华, 赵京涛, 孙呈慧, 蔡峰, 陈晓辉, 张勇, 范佳慧, 石学法. 冲绳海槽MIS6期以来底栖有孔虫碳氧同位素特征及其古海洋指示意义[J]. 地学前缘, 2022, 29(4): 84-92.

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.

图/表 7

图1 东海陆架-冲绳海槽环流体系和CSHC-15孔位置图

Fig.1 Circulation system in the East China Sea Shelf-Okinawa Trough and location of core CSHC-15

表1 CSHC-15孔AMS 14C测年及日历年校正

Table 1 AMS 14C dating of Core CSHC-15 and calendar year correction

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)

图2 CSHC-15孔δ18O曲线、全球δ18O标准曲线(LR04)[7]与测量壳体同位素使用的底栖有孔虫属种

Fig.2 From left: δ18O for core CSHC-15 (before correction), global δ18O (after [7]), δ18O for core CSHC-15 (after correction), and benthic foraminifera species used in shell isotope measurements

图3 CSHC-15孔δ13C、CaCO3含量变化与测量壳体同位素使用的底栖有孔虫属种(灰色条带为δ13C值异常值)

Fig.3 δ13C and CaCO3 content changes in core CSHC-15 (δ13C anomaly values indicated by gray strips) and benthic foraminifera species used in shell isotope measurements

图4 CSHC-15孔δ13C对比冲绳海槽古氧化-还原指标(aUu1429)[23]、北太平洋NPIW演化指标(Δδ13C(‰)[45]; Δδ18O(‰)[46])、全球海平面曲线[48]

Fig.4 Comparisons between δ13C and paleo-redox porxies for in core CSHC-15. Modified from [23,45-46,48].

图5 CSHC-15孔底栖有孔虫碳氧同位素特征

Fig.5 Carbon and oxygen isotopic characteristics of benthic foraminifera in core CSHC-15

图6 CSHC-15底栖有孔虫C. wuellerstorfi显微形貌SEM照片

Fig.6 SEM microphotographs of benthic foraminifera (C. wuellerstorfi) in core CSHC-15

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冲绳海槽MIS6期以来底栖有孔虫碳氧同位素特征及其古海洋指示意义

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

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