西太平洋卡罗琳海域沉积速率：来自3种测年方法的限定

陈亮; 殷征欣; 刘紫荆; 唐盟

doi:10.12284/hyxb2022051

西太平洋卡罗琳海域沉积速率：来自3种测年方法的限定

doi: 10.12284/hyxb2022051

陈亮^{1, 2,},
殷征欣^{1, 2, ,},
刘紫荆^{1, 2},
唐盟^{1, 2}

1.
国家海洋局南海调查技术中心，广东广州 510300
2.
自然资源部海洋环境探测技术与应用重点实验室，广东广州 510300

基金项目: 全球变化与海气相互作用专项（GASI-02-PAC-CJ10）；国家自然科学基金青年科学基金项目（41706055）。

详细信息

作者简介:
陈亮（1981-），男，湖北省当阳市人，博士，高级工程师，主要从事海洋沉积环境方面研究。E-mail:randal34@163.com

通讯作者:
殷征欣（1987-），男，河南省南阳市人，博士，高级工程师，从事海洋地质方面的研究。E-mail：yinzhengxin777@163.com

中图分类号: P736.21
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-18
- 修回日期: 2021-09-24
- 网络出版日期: 2022-07-13
- 刊出日期: 2022-07-13

Sedimentation rate obtained by multiple chronological analysis in Caroline area of the western Pacific Ocean

Chen Liang^{1, 2
,},
Yin Zhengxin^{1, 2
, ,},
Liu Zijing^{1, 2},
Tang Meng^{1, 2}

1.
South China Sea Marine Survey and Technology Center, State Oceanic Administration, Guangzhou 510300, China
2.
Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resources, Guangzhou 510300, China

摘要

摘要: 为了更好地认识西太平洋暖池区北部卡罗琳海域沉积速率的变化，利用放射性碳测试（¹⁴C）、氧同位素及古地磁方法对采自西太平洋卡罗琳地区一根长217 cm的柱状样开展了综合年代学分析。¹⁴C数据获取了样品上部44.3 ka BP以来的年代数据，在此基础上利用氧同位素及古地磁相对强度数据建立了该柱125 cm至表层的年代框架，对应为MIS4期（约8万年）以来的沉积。进一步分析发现本柱在126～127 cm处存在明显沉积间断，虽然该处已超出¹⁴C测年范围，但古地磁测试结果表明该柱位于布容正极性时期，同时古地磁强度与氧同位素的变化关系为沉积间断以下年代数据获取提供了可信的证据，表明该阶段对应距今13万年至18万年时期。本柱沉积速率在沉积间断前后均较为一致，为1～2 cm/ka。同时对比不同方法获取的沉积速率之间差异后，发现个别层位可能由于较高的有孔虫破壳率，导致¹⁴C值存在较大偏差。
- ¹⁴C /
- 氧同位素 /
- 古地磁 /
- 沉积速率 /
- 西太平洋
Abstract: In order to better understand the sedimentary rate changes in the Caroline area which is located in the north of West Pacific Warm Pool, a comprehensive dating method was carried out by using radiocarbon testing(¹⁴C), oxygen isotope and paleomagnetism on a gravity core from the Caroline area of the western Pacific Ocean. ¹⁴C data provide the age of the upper section since 44.3 ka BP for this core. Subsequently, the age framework since MIS4 (about 80 ka) which corresponds to the depth of 125 cm was established by using oxygen isotope and relative paleointensity (RPI) data, while the upper part also considered the ¹⁴C data. Further analysis revealed that there was an obvious sedimentary discontinuity at the depth of 126 cm to 127 cm in this core, although it has been beyond the range of ¹⁴C dating, but the paleomagnetic results show that the core formed in Brunhes period, and the relationship between RPI and oxygen isotope data under the hiatus provide a robust evidence that the age is from 180 ka to 130 ka in the bottom. At the end the deposition rate of the core was obtained, which is 1 cm/ka to 2 cm/ka, and it is consistent before and after the deposition hiatus. At the same time, the disparity of the deposition rate for each dating method indicated that there was a large deviation of¹⁴C data in one layer maybe due to the high rate of foraminiferal shell breaking.
- ¹⁴C /
- oxygen isotope /
- paleomagnetic /
- sedimentation rate /
- western Pacific Ocean

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图 1 取样位置图

Fig. 1 Sampling location

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图 2 氧同位素结果与LR04对比图

Fig. 2 The distribution of oxygen isotope data compares with LR04

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图 3 部分样品古地磁退磁曲线图

Fig. 3 The demagnetization curves for some samples

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图 4 古地磁倾角最大偏差角（MAD）及相对强度（RPI）变化图

RPI_{NRM30 mT/ARM30 mT}曲线中虚线部分（96~110 cm）由于样品原因，未获得ARM值，该层位年代值主要通过由k归一化的RPI获取

Fig. 4 The variation of magnetic inclination maximum angular deviation (MAD) and relative paleointensity (RPI)

The ARM value from 96 cm to 110 cm have not been got for the sample lost, where is dotted in RPI_{NRM30 mT/ARM30 mT} curve, and the age in this depth mainly obtained from the RPI_{NRM30 mT/k} curve

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图 5 沉积间断以下年代获取对比图

Fig. 5 The comparison for the obtained chronology below the sedimentary hiatus

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图 6 3种方法年代（a）及沉积速率（b）对比图

Fig. 6 The distribution of age （a）and sedimentation rate （b）for three dating methods

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表 1 AMS¹⁴C测试及校对结果

Tab. 1 The testing and calibration result of AMS¹⁴C

深度/cm	惯用年龄/a BP	惯用年龄误差/a BP	校正年龄值/cal a BP
3	7 090	±30	7 532
13	11 890	±30	13 325
23	17 180	±60	20 248
33	19 070	±70	22 552
43	27 980	±120	31 465
53	31 050	±170	34 973
63	35 460	±250	40 193
73	41 200	±470	43 771

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表 2 本柱年代框架数据

Tab. 2 Age frame data for this core

深度/cm	年代/ka	沉积速率/（cm·ka⁻¹）		依据方法	备注
3	7.53	1.73		¹⁴C
13	13.33	1.73	1.44	¹⁴C
23	20.25	1.74	1.44	¹⁴C
33	26.00	1.74	1.83	氧同位素
43	31.47	2.85	1.83	¹⁴C
53	34.97	2.85	1.92	¹⁴C
63	40.19	2.79	1.92	¹⁴C
73	43.77	2.79	1.23	¹⁴C
83	51.91	1.96	1.23	氧同位素
93	57.00	1.96	1.43	氧同位素
103	64.00	1.43	1.43	氧同位素
113	71.00	1.43	1.36	氧同位素
126	80.53	—	1.36	氧同位素	沉积间断
127	131.00	—	1.67	RPI	沉积间断
132	134.00	1.67	1.67	RPI
152	146.00	1.67	1.65	RPI
180	163.00	2.00	1.65	RPI
210	178.00	2.00	2.00	RPI
217	181.50		2.00	RPI
注：− 表示未获得数据。

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