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

Chen Liang; Yin Zhengxin; Liu Zijing; Tang Meng

doi:10.12284/hyxb2022051

Volume 44 Issue 6

Jul. 2022

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Chen Liang，Yin Zhengxin，Liu Zijing, et al. Sedimentation rate obtained by multiple chronological analysis in Caroline area of the western Pacific Ocean[J]. Haiyang Xuebao，2022, 44(6)：80–88 doi: 10.12284/hyxb2022051

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

doi: 10.12284/hyxb2022051

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

Received Date: 2021-06-18
Rev Recd Date: 2021-09-24

Available Online: 2022-07-13

Publish Date: 2022-07-13

Abstract

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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