An abrupt backreef infilling in a Holocene reef, Paraoir, Northwestern Luzon, Philippines

Shou Yeh Gong, Tso Ren Wu, Fernando P. Siringan, Ke Lin, Chuan Chou Shen

研究成果: 雜誌貢獻期刊論文同行評審

6 引文 斯高帕斯(Scopus)

摘要

We describe a sudden backreef infilling at the west coast of Luzon, Philippines, which occurred after 324 ± 12 yr ago (year BP, before 1950 AD). Results of 30 230Th-dated fossil corals from the surface and 5 cores, 17-29. 1 m in length, recovered from a Holocene reef at Paraoir show that the reef flat developed in two stages. The reef margin is dated at 10,256 ± 50 (2σ) yr BP at 23. 9 m below mean sea level (MSL) and about 6,654 ± 29 yr BP at 3. 7 m below MSL with ages increasing with depth. The reef flat was formed with sediments of 818-324 yr BP old, which do not follow an age-depth correlation. The evidence suggests that a backreef moat remained empty throughout the buildup of the reef for about 6 kyr and was filled abruptly with a 26-m-thick succession of rubble and bioclastics by an extreme wave event (EWE) after 324 ± 12 yr BP. Field evidence, historical records, and tsunami simulation suggest the EWE sedimentation was likely caused by a single severe tropical cyclone, although the possibility of tsunami is not ruled out. The Paraoir reef flat was built up in a mode different from previously reported cases of Holocene reefs.

原文???core.languages.en_GB???
頁(從 - 到)293-303
頁數11
期刊Coral Reefs
32
發行號1
DOIs
出版狀態已出版 - 3月 2013

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