Luminescence dating of a sedimentary sequence in the eastern North Yellow Sea
Luminescence dating of a sedimentary sequence in the eastern North Yellow Sea
复制标题
北黄海东部沉积层序的发光测年
DOI：
10.1016/j.marpetgeo.2022.105543
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发表时间：
2022
影响因子：
4.2
通讯作者：
Hao Long
中科院分区：
文献类型：
--
作者：
Lei Gao;Jun Li;Bangqi Hu;Liang Yi;Toru Tamura;Hao Long
黄海沉积物是研究全球和区域海平面变化与地层演化关系的重要资料。这里是一个100米长的岩芯的上部40米厚的间隔。通过对北黄海东部的17号沉积物（NYS 17）的研究，探讨了该地区晚第四纪的沉积历史。为了获得可靠的岩心年代框架，我们利用沉积物的多种发光信号进行定年。粗粒（CG）和细粒（FG）石英的光学受激发光（OSL）和钾长石/多矿物后红外（IR）IR受激发光。分析pIRIR 50/150信号以获得用于比较的年龄估计值。初步结果表明，石英光释光年龄与IR 50和pIRIR 150信号校正年龄一致。NYS17.5孔的年代地层学显示出两个快速堆积阶段。一个在35.6- 29.8m之间，沉积地层年龄控制在135-130 ka，对应于海洋同位素阶段（MIS）6/5。另一个发生在上段（14.5-0.9 m），发光年龄限制在11 - 9 ka之间。然而，9 ka后的覆盖物似乎是非常薄的核心网站。这可能是由于全新世早期丰富的陆源沉积物供给，以及海平面进一步上升和海侵后的饥饿所致。相比之下，由于没有年龄限制，MIS 5-2间期在岩心中仍远未精确定义。在区域上，我们的岩心年代地层与其他收集的岩心，从YS和东海的对比，显示出可比的晚更新世和全新世沉积序列的沉积记录。这些结果表明，在冰期-间冰期旋回中，YS陆架沉积过程的时空变化与全球海平面变化密切相关。
Sediments from the Yellow Sea (YS) are important archives for investigating the stratigraphic evolution in.relation to global and regional sea-level changes. Here, the upper 40-m-thick interval of a 100-m-long drill core.(NYS17), retrieved from the eastern North Yellow Sea (NYS), were studied to explore the late Quaternary.sedimentary history in this region. To obtain reliable chronological framework of the core, we utilized multiple.luminescence signals from sediments for dating. Coarse-grained (CG) and fne-grained (FG) quartz optically.stimulated luminescence (OSL), and K-feldspar/polymineral post-infrared (IR) IR stimulated luminescence.(pIRIR50/150) signals were analyzed to obtain age estimates for comparison. Primary results show that quartz OSL.ages are consistent with the corrected ages of IR50 and pIRIR150 signals. Chronostratigraphy of core NYS17.presents two phases of rapid accumulation. One is at the interval of 35.6–29.8 m deep, as age controls of.sedimentary stratigraphy are in the period of 135–130 ka, corresponding to Marine Isotope Stage (MIS) 6/5..Another occurs in the upper section (14.5–0.9 m) as luminescence ages are constrained between 11 and 9 ka..However, the overlying deposits after 9 ka seem to be very thin in the core site. This is likely attributed to the.abundant terrestrial sediment supply during the early Holocene and following starvation after further rise of the.sea level and transgression. In contrast, the MIS 5–2 interval remains far to be exactly defned in the core as no.age constraint is available. Regionally, correlations of chronostratigraphy of our core with other collected cores.from the YS and East China Sea, show comparable depositional records for both the late Pleistocene and Holocene sedimentary successions. These fndings indicate that the spatiotemporal variations of sedimentary processes in the YS shelf were closely linked to global sea-level changes during the glacial-interglacial cycles.