Coral-based Holocene sea level of Paraoir, Western Luzon, Philippines

Research paper by Fernando P. Siringan, Chuan-Chou Shen, Ke Lin, Maria Isabel T. Abigania, Shou-Yeh Gong

Indexed on: 06 Apr '16Published on: 30 Mar '16Published in: Journal of Asian Earth Sciences


Shallow-water corals are crucial natural archives for reconstructing deglacial sea-level changes. However, significant discrepancies exist between sea-level records from different places. Here we present recently acquired 230Th-dated coral ages between 10,256 ± 50 yr BP and 6,654 ± 29 yr BP (before 1950 AD) from Paraoir, western Luzon, Philippines to document deglacial sea-level rise of the western Pacific. The results indicate that the Paraoir reef started growing 10.3 kyr BP from about 29 m below present sea level, and reached 8 m below the PSL at 7.2 kyr BP. The Paraoir sea-level records are consistent with those of northwestern Luzon and the western Australia coast; both of which are coral-based records in continental or island arc settings. But sea levels of Luzon are significantly higher than those of Tahiti, a basaltic island on oceanic crust. We propose that the differences in sea level between the Philippine and Tahiti result from spatial variations of glacial isostatic adjustment of the two sites.

Figure 10.1016/j.jseaes.2016.03.022.0.jpg
Figure 10.1016/j.jseaes.2016.03.022.1.jpg
Figure 10.1016/j.jseaes.2016.03.022.2.jpg
Figure 10.1016/j.jseaes.2016.03.022.3.jpg