南科1井第四系暴露面特征及其与海平面变化的关系*

doi:10.11978/2021013

Abstract

Abstract:

Exposure surfaces in shallow-water carbonates are considered to be the faithful archive of paleo sea-level fluctuations, which are important for studying carbonate sequences and development of coral islands. Based on core observations, thin section identifications, and analyses of stable isotopes and mineral compositions, we identified nine main exposure surfaces in the Quaternary reef carbonates from a deep borehole “Well Nanke-1” (NK-1) drilled on Meiji Island, and we discussed their relationship with sea-level change and coral reef evolution in the South China Sea. Exposure surfaces in the Quaternary reef carbonates in Well NK-1 are characterized by heavily dissolved cavities and rich calcareous nodules with reddish-brown or yellowish colors. Weathered carbonates around most exposure surfaces have negative carbon and oxygen isotopes, and higher contents of Al, Th, Fe, and rare earth elements. The AMS¹⁴C and U-Th age data confirm that the Holocene coral reefs have developed during 8.2~4.7 ka on Meiji Island; and its growth period is consistent with that of other coral reefs in the South China Sea. The slow rise in sea level provided a favorable environment for the vertical growth of most coral reefs. Most exposure surfaces within Pleistocene stratum of Well NK-1 correspond to low sea-level stages, and the dated ages of these exposure surfaces by Sr isotopes and paleomagnetic studies are consistent with the records from the Xisha Islands and Yongshu Island.

Key words: Well Nanke-1, exposure surface, sea level, reef evolution, South China Sea

CLC Number:

P736.2

LUO Yun, LI Gang, XU Weihai, CHENG Jun, LIU Jianguo, YAN Wen. Characteristics of Quaternary exposure surfaces in Well Nanke-1 and their relationship with sea-level changes[J].Journal of Tropical Oceanography, 2022, 41(1): 143-157.

Figures/Tables 10

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样品编号	深度/m	测试材料	AMS¹⁴C年龄/a BP	校正年龄/cal. a BP
NK-A5	8.3	同孔珊瑚属	5040±30	5386
NK-A13	12.8	扁脑珊瑚属	6070±30	6490
NK-A14	14.7	角蜂巢珊瑚属	6840±30	7362
NK-A20	17.8	鹿角珊瑚属	7480±30	7941
NK-A22	18.3	鹿角珊瑚属	7520±30	7974
NK-A24	19.4	角蜂巢珊瑚属	7740±30	8215

样品编号	深度/m	U/ppm	²³²Th/ppb	(²³⁰Th/²³²Th)	(²³⁰Th/²³⁸U)	(²³⁴U/²³⁸U)	²³⁰Th年龄/a		日历年龄/ a BP	δ²³⁴U
样品编号	深度/m	U/ppm	²³²Th/ppb	(²³⁰Th/²³²Th)	(²³⁰Th/²³⁸U)	(²³⁴U/²³⁸U)	未校正	校正	日历年龄/ a BP	δ²³⁴U
U-Th-01	5.1	2.5862±0.0013	0.251±0.001	1547.46±6.62	0.0495±0.0002	1.1472±0.0013	4807±17	4804±17	4735	147.2±1.3
U-Th-02	7.2	3.1834±0.0015	1.666±0.011	315.15±2.90	0.0544±0.0004	1.1447±0.0013	5299±36	5286±36	5217	144.7±1.3
U-Th-03	7.5	2.8472±0.0008	1.620±0.003	290.52±2.12	0.0545±0.0004	1.1450±0.0010	5311±38	5296±39	5227	145.0±1.0
U-Th-04	10.8	2.8481±0.0011	7.352±0.013	66.37±0.40	0.0565±0.0003	1.1449±0.0009	5509±33	5442±46	5373	144.9±0.9
U-Th-05	19.0	2.5728±0.0011	0.424±0.001	1530.45±8.47	0.0831±0.0004	1.1446±0.0015	8203±43	8198±43	8129	144.6±1.5

样品编号	深度/m	⁸⁷Sr/⁸⁶Sr	2σ	平均年龄/Ma
NK1-Sr-01	30.9	0.709183	0.000008	0.07
NK1-Sr-02	40.5	0.709171	0.000009	0.13
NK1-Sr-03	48.0	0.709163	0.000010	0.40
NK1-Sr-04	56.5	0.709160	0.000009	0.49
NK1-Sr-05	61.2	0.709153	0.000009	0.65
NK1-Sr-06	65.3	0.709140	0.000009	1.00
NK1-Sr-07	70.2	0.709126	0.000009	1.20
NK1-Sr-08	85.6	0.709118	0.000008	1.29
NK1-Sr-09	89.8	0.709117	0.000011	1.30
NK1-Sr-10	109.9	0.709105	0.000009	1.45
NK1-Sr-11	118.1	0.709100	0.000009	1.55
NK1-Sr-12	123.1	0.709130	0.000009	1.63
NK1-Sr-13	125.3	0.709123	0.000008	1.65
NK1-Sr-14	125.8	0.709140	0.000009	1.67
NK1-Sr-15	130.2	0.709141	0.000010	1.70
NK1-Sr-16	138.1	0.709130	0.000009	1.71
NK1-Sr-17	143.6	0.709111	0.000011	1.80
NK1-Sr-18	163.6	0.709086	0.000008	1.87
NK1-Sr-19	178.2	0.709070	0.000009	2.15
NK1-Sr-20	187.9	0.709072	0.000009	2.35
NK1-Sr-21	200.5	0.709068	0.000010	2.40
NK1-Sr-22	204.2	0.709064	0.000009	2.45
NK1-Sr-23	210.2	0.709057	0.000010	2.50
NK1-Sr-24	222.0	0.709063	0.000011	2.55

Characteristics of Quaternary exposure surfaces in Well Nanke-1 and their relationship with sea-level changes

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