Terraces of the South Sea Islands Under the Japanese Mandate
Tayama, Risaburo (1939-06-12). "Terraces of the South Sea Islands Under the Japanese Mandate". Proceedings of the Imperial Academy. 15 (5): 139–141. doi:10.2183/pjab1912.15.139. ISSN 1881-1140.
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Abstract: “Terraces of the South Sea Islands Under the Japanese Mandate” examines the different terraces found on the islands under Japanese control in the South Pacific. These terraces vary in their degree of development and elevation across different islands, with the most significant examples found on Rota island in the South Mariana group, which features coral reef surfaces, while higher surfaces in the East Caroline group are comprised of basalt flows.
The article discusses the correlation of terraces across these islands, which is relatively straightforward when the islands are situated on the same submarine ridge, but more complex when they belong to different ridges. A key feature for correlation is the Plio-Pleistocene elevated coral reef limestone, known as the Mariana and Palau limestone, found on several of the islands. This limestone is used as a benchmark to correlate other terraces.
The writer categorizes the terraces into four groups based on their formation and development: Pre-Mariana terraces (PM), Mariana terrace (M), Pelilieu terrace (P), and Post-Pelilieu terrace (PP). These are distinguished by their unique characteristics and distribution, for example, PM terraces are confined to certain island groups, while PP terraces are universally found across the islands, allowing for studies of sea-level changes.
The study notes a relationship between the development of coral reefs and crustal movement. For example, the South Mariana group exhibits well-developed terraces without drowned valleys, indicating features such as apron-reef and fringing-reef coral formations. In contrast, the East Caroline group, with poorly developed terraces, shows significant drowned valleys and features more pronounced barrier reefs and atolls.
Extra details:
QID: Q129418917 MAG: 940969729 OpenAlex: W940969729 CorpusID: 126719741
