Last Glacial Cycle and seismic stratigraphic sequences offshore western Hainan Island, NW South China Sea
Last Glacial Cycle and seismic stratigraphic sequences offshore western Hainan Island, NW South China Sea
复制标题
DOI：
10.1144/sp429.9
复制
发表时间：
2016-05
期刊：
影响因子：
--
通讯作者：
Hongjun Chen;J. Harff;Y. Qiu;A. Osadczuk;Jinpeng Zhang;M. Tomczak;Zhaoguo Cui;Guangqiang Cai;Ming-ming Wen;Liqing Li
中科院分区：
文献类型：
--
作者：
Hongjun Chen;J. Harff;Y. Qiu;A. Osadczuk;Jinpeng Zhang;M. Tomczak;Zhaoguo Cui;Guangqiang Cai;Ming-ming Wen;Liqing Li
摘要为了研究末次冰期海平面变化与南海西北部陆架地震地层序列的关系，利用单道高分辨率地震剖面和海南岛西部近海沉积岩芯进行了对比。可以改进与当地和全球海平面变化有关的地震地层学解释。根据加速器质谱（AMS）~（14）C和光释光（OSL）测年以及δ ~（18）O地层学建立的年龄模型，88.3m的沉积物柱反映了110 ka以来的环境变化。与沉积物芯在相邻盆地的基础上稳定的氧同位素记录的相关性允许的沉积物芯和海洋同位素阶段（MIS）1-5e的识别的顶部1 - 5米的分区。识别出7个解释为不整合面的地震反射层。这些侵蚀面已通过插值使用年龄-深度模型相比，全球海平面变化曲线。结果表明，在LGC期间，研究区可以区分出7个海平面变化周期，这些周期与区域和全球海平面变化模式相关。进一步的研究证实，南海西北部的地震地层学与LGC海平面变化密切相关，LGC海平面变化与区域地表抬升和沉积物供给有关。
Abstract In order to investigate the relationship between sea-level changes during the Last Glacial Cycle (LGC) and seismic stratigraphic sequences on the NW continental shelf of the South China Sea, a sparker single-channel high-resolution seismic profiling was correlated with a sediment core taken offshore western Hainan Island. Interpretation of the seismic stratigraphy in relation to local and global sea-level changes could be refined. According to the age model, developed from AMS (accelerator mass spectrometry)-14C and OSL (optically stimulated luminescence) dates, and δ18O (oxygen isotope) stratigraphy, the 88.3 m sediment core reflects environmental change since 110 ka. Correlation with a sediment core in the adjacent basin based on stable oxygen isotope records allows a zonation of the top 15 m of the sediment core and the identification of marine isotope stages (MIS) 1–5e. Seven seismic reflectors interpreted as unconformities were identified. These erosional surfaces have been dated by interpolation using an age–depth model compared to global eustatic curves. The results indicate that seven sea-level cycles can be distinguished in the study area during the LGC, and these are correlated with regional and global sea-level change models. Further research confirms that seismic stratigraphy in the NW South China Sea can be intimately related to LGC sea-level changes associated with regional surface uplift and sediment supply.