
High-resolution reconstruction of carbonate compensation depth in the South China Sea since 27 Ma
Jiahao WANG, Xiumian HU, Jingxin JIANG, Chao MA, Pengfei MA
High-resolution reconstruction of carbonate compensation depth in the South China Sea since 27 Ma
The reconstruction of carbonate compensation depth (CCD) in the Cenozoic Ocean has been a focus of attention from the academic community. In this paper, based on the IODP (Integrated Ocean Drilling Program) substances data and age-depth models from 20 boreholes at 14 sites in the South China Sea, the paleo-water depths in the boreholes were restored, the carbonate accumulation rate (CAR) was calculated, and CCD changes in the South China Sea since 27 Ma were reconstructed using linear regression method. Results showed that CCD in the South China Sea significantly decreased by more than 2000 m during the basin stretching period (27-18 Ma), while during Middle Miocene Climate Optimum (MMCO) it became shallower by 800 m. Since 8 Ma, CCDs in the South China Sea and the equatorial Pacific Ocean exhibited different evolutionary trends, with the former fluctuating between 3500-4000 m and the latter continuing to decline from 4000 m to ~4500 m. Prior to 27 Ma, extensive terrigenous input and development of upwelling led to shallow CCD in the South China Sea. The deepening of the sea basin and the weakening of the upwelling caused by tectonic tension during 27-18 Ma were interpreted as the main factors contributing to the decline of CCD during this period. Climate-driven sea-level fluctuations during MMCO led to changes in the core region of carbonate deposition, which was an important reason for CCD fluctuations. The differential evolution of CCD in the South China Sea and the Pacific Ocean since 8 Ma was the result of poor bottom water exchange between the Pacific Ocean and the South China Sea.
carbonate compensation depth (CCD) / South China Sea / carbon cycle / marginal sea
[1] |
|
[2] |
|
[3] |
|
[4] |
|
[5] |
|
[6] |
|
[7] |
|
[8] |
|
[9] |
|
[10] |
|
[11] |
|
[12] |
|
[13] |
李粹中. 南海深水碳酸盐沉积作用[J]. 沉积学报, 1989, 7(2): 35-43.
|
[14] |
|
[15] |
张江勇, 周洋, 陈芳, 等. 南海北部表层沉积物碳酸钙含量及主要钙质微体化石丰度分布[J]. 第四纪研究, 2015, 35(6): 1366-1382.
|
[16] |
翦知湣, 田军. 南海海盆演变与深部海流[J]. 科技导报, 2020, 38(18): 52-56.
|
[17] |
|
[18] |
汪品先. 南海深部过程的探索[J]. 科技导报, 2020, 38(18): 6-20.
|
[19] |
吴哲, 张丽丽, 朱伟林, 等. 南海北部白垩纪—渐新世早期沉积环境演变及构造控制[J]. 古地理学报, 2022, 24(1): 73-84.
|
[20] |
朱作飞, 闫义, 赵奇. 古南海俯冲过程:婆罗洲晚白垩世—渐新世地层沉积记录[J]. 大地构造与成矿学, 2022, 46(3): 552-568.
|
[21] |
|
[22] |
|
[23] |
王桂华, 田纪伟. 南海深层水的来龙去脉[J]. 科技导报, 2020, 38(18): 21-25.
|
[24] |
|
[25] |
|
[26] |
|
[27] |
|
[28] |
|
[29] |
|
[30] |
|
[31] |
|
[32] |
|
[33] |
陈荣华, 徐建, 孟翊, 等. 南海东北部表层沉积中微体化石与碳酸盐溶跃面和补偿深度[J]. 海洋学报, 2003(2): 48-56.
|
[34] |
|
[35] |
|
[36] |
|
[37] |
|
[38] |
|
[39] |
|
[40] |
|
[41] |
|
[42] |
张桂林. 18.5 Ma 以来南海海平面变化特征[D]. 成都: 成都理工大学, 2019.
|
[43] |
|
[44] |
|
/
〈 |
|
〉 |