Subsidence theory

Japanese: subsidence theory(英語表記)subsidencetheory
Subsidence theory


[Various theories about reef formation]
Why are there six main types of coral reefs and why is there a pattern to their distribution? In 1842, C. Darwin pointed out three basic types of coral reefs: fringing reefs, barrier reefs, and atolls, and proposed the subsidence theory, which states that fringing reefs evolved into barrier reefs and then atolls as land subsidence, i.e., ocean floor subsidence, occurred. JD Dana then proposed in 1853 that the curvature of the coastline of islands behind coral reefs and the existence of drowned valleys were topographical evidence for the subsidence theory.

*Some explanations of terms that mention "subsidence theory" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:


[礁形成についての諸説]
 サンゴ礁にはなぜこのような六つの主タイプができ,かつその分布に規則性があるのであろうか。かつてC.ダーウィンは1842年にサンゴ礁に裾礁,堡礁,環礁と三つの基本型を指摘し,陸地の沈降,すなわち海洋底の沈降にともない,裾礁から堡礁,さらに環礁へと順次移化していったとする沈降説subsidence theoryを唱えた。続いてJ.D.デーナは53年にサンゴ礁背後の島の海岸線の屈曲と溺れ谷の存在は沈降説の地形的証拠であるとした。…

※「subsidence theory」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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