U-series dates of Pleistocene corals and their implications to the paleo-sea levels and the vertical displacement in the Central Philippines
U-series dates of Pleistocene corals and their implications to the paleo-sea levels and the vertical displacement in the Central Philippines
复制标题
DOI：
10.1016/s1040-6182(03)00092-2
复制
发表时间：
2004
影响因子：
2.2
通讯作者：
A. Omura;Y. Maeda;T. Kawana;F. Siringan;R. Berdin
中科院分区：
文献类型：
--
作者：
A. Omura;Y. Maeda;T. Kawana;F. Siringan;R. Berdin
对菲律宾西部巴拉望岛、菲律宾中部宿务岛、博霍岛和邦老岛的珊瑚进行了高精度的α能谱230Th/234U测年，结果证实在目前平均海平面以上2~≥13m处存在MIS5E礁阶地，类似于稳定区。这表明这些岛屿自上一次间冰期以来具有相对的垂直稳定性。在庞老岛，5E阶地的海拔向东北升高，表明该岛向西南倾斜。中全新世潮汐凹陷空间变化的相似性表明，至少在最后一次间冰期以来，持续的隆升意义。一个5c的露台，虽然开发程度较低，但在庞老岛也得到了认可。在圣伊西德罗海岸，5C和5E阶地的内缘分别位于海拔5米和7.1-8m处，两个阶地之间的海拔高度差仅为2-3m。假设MIS5e期间的海平面比现在的海平面高出3-6m，那么MIS5c的海平面估计等于或略高于现在的平均海平面。
Results of high-precision alpha-spectrometric230Th/234U dating of hermatypic corals in Palawan in western Philippines, and Cebu, Bohol and Panglao Islands in the central Philippines, confirm the presence of MIS 5e reef terraces at 2 to ≥13m above the present mean sea level, similar to stable regions. This suggests the relative vertical stability of the islands since the Last Interglacial Period. In Panglao Island, the elevation of the 5e terrace increases to the northeast indicating tilting of the island to the southwest. The continued sense of uplift, since at least the last interglacial, is indicated by the similarity in the spatial variation of middle Holocene tidal notch. A 5c terrace, though less developed, is also recognized in Panglao Island. Along the San Isidro coast, the inner margins of 5c and 5e terraces are at elevations of 5 and 7.1–8m, respectively, and the difference in altitude between the terraces is only ca. 2–3m. Assuming that the sea level during MIS 5e was 3–6m above the present sea level, sea level at MIS 5c is estimated to be equal to or slightly higher than the present mean sea level.