Early Holocene relative sea-level changes on the central east coast of the Yellow Sea
Early Holocene relative sea-level changes on the central east coast of the Yellow Sea
复制标题
黄海中部东岸全新世早期相对海平面变化
DOI：
10.1016/j.palaeo.2022.111185
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Kashima Kaoru
中科院分区：
文献类型：
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作者：
Yang Dong-Yoon;Han Min;Yoon Hyun Ho;Cho Ara;Kim Jin Cheul;Choi Eunseo;Kashima Kaoru
古相对海平面（paleo-RSL）的远场记录是制约全球海平面变化模型的关键。我们比较了黄海中东部海岸与研究区最北端的渤海湾和南部的群山湾的早全新世RSL历史。一个多代理的方法，包括岩石地层学，生物地层学，结合放射性碳和光释光测年，促进了28个海平面指数点（SLIP）的产生使用11个钻孔样本。通过对研究区10.3ka以来基底泥炭的发掘，确定了全新世早期海侵的RSL为-14.88m，比群山湾9.8ka时的-27.9m要浅得多，与渤海湾9.7ka时的-17.3m相似。将研究区的实测RSL和预测曲线与其他地区的RSL和预测曲线进行了比较。群山湾全新世早期的GIA预测曲线与观测结果一致，这可能是地壳厚度和地幔粘度“低背景”的结果。因此，可以推测，研究区域和群山湾之间观测到的海拔高度的显著差异是由构造特征差异引起的勒韦林效应造成的。相反，7.6-6 ka期间的其他观测组与研究地点早全新世的预测曲线具有相似的斜率，认为早全新世的沉积物沿河道被侵蚀并重新沉积沿着。这些结果是非常重要的海平面变化的数据在远场由于冰川崩塌和GIA建模过程中的数据。
Paleo-relative sea level (paleo-RSL) records in the far-field are essential for constraining models for global sea level change. We compared the early Holocene RSL history on the central east coast of the Yellow Sea with those of Bohai Bay, the northernmost point, and Gunsan Bay, south of the study area. A multi-proxy approach, including lithostratigraphy, biostratigraphy, combined with radiocarbon and OSL dating, facilitated the generation of 28 sea level index points (SLIPs) using 11 borehole samples. Excavation of basal peat of the 10.3 ka in the study area established that the observed RSL of the transgression in the early Holocene was −14.88 m, which was much shallower than −27.9 m in Gunsan Bay at 9.8 ka and was similar to −17.3 m in Bohai Bay at 9.7 ka. The observed RSL and the prediction curves of the study area were compared with those of other areas. In Gunsan Bay, the early Holocene GIA prediction curves are consistent with those observed, which seems to be the result of a “low setting” of the crust thickness and mantle viscosity. Therefore, it is presumed that the significant difference in the elevations observed between the study area and Gunsan Bay is caused by the levering effect owing to the difference in the tectonic characteristics. Conversely, other observed groups during 7.6–6 ka have a similar slope to the prediction curve of the Early Holocene in the study site, and it is thought that the sediments of the early Holocene were eroded and re-deposited along the channel. These results are of great importance as data of sea level variability in the far field due to glacial collapse and as data for the GIA modeling process.