Basic studies on growth bands (daily, monthly and annual bands) of corals

珊瑚生长带（日、月、年带）的基础研究

• 批准号: 05640510
• 负责人: MORI Kei
• 金额: $ 1.34万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05640510/
• 关键词: growth bands; geochronometry; rugose corals; scleractinian corals; 成長率; 酸素安定同位体比; 年輪

Although it has been widely accepted that the number of days per year have decreased through geological time based on daily and annual growth increments of corals, our study indicates that ancient coral growth bands should be reconsidered for daily and monthly geochronometric calibrations. Minute growth bands in two fossil scleractinian coral species from the Pleistocene of Japan were counted by SEM and the oxygen stable isotope ratio was measured to obtain their annual growth rates.There are really two different types of bands and they have different origins. In Truncatoflabellum formosum, each band is demonstrated to have formed per half-month interval.The band widths (0.05-0.20 mm) are nearly equivalent with those of rugose corals. In Tachyphyllia geoffroi, each band was formed daily and the band widths are much finer than the former species. This study suggests that "daily" bands derived from the rugose corals were not previously thought formed daily. Furthermore, lunar monthly periodicities postulated in the Paleozoic corals were probably really annual.

虽然它已被广泛接受，每年的天数减少，通过地质时间的基础上每日和每年的珊瑚生长增量，我们的研究表明，古代珊瑚生长带应重新考虑每日和每月的地质年代学校准。本文用扫描电镜计数了日本更新世两种石珊瑚化石中的微小生长带，并测定了它们的氧稳定同位素比值，得到了它们的年生长率。在Truncatoflabellumformosum中，每隔半个月就有一条带形成，其带宽（0.05-0.20 mm）与皱纹珊瑚相当。在Tachyphyllia geoffroi中，每个带每天都形成，并且带的宽度比前一种要细得多。这项研究表明，来自皱纹珊瑚的“日常”带以前并不认为是每天形成的。此外，在古生代珊瑚中假设的月球月周期可能真的是一年一次。

项目成果

Mori,K.,et al.: "Coral growth bands as tools of geochronometry reconsidered." Lethaia. (発表予定).

Mori, K. 等人：“珊瑚生长带作为地球测时工具的重新考虑。”Lethaia。

Coral growth bands as tools of geochronometry reconsidered. Lethaia (under preparation):

珊瑚生长带作为地球测时工具的重新考虑。

Mori.K,et al.: "Coral growth bands as tools of geochronometry reconsidered." Lethaia. (発表予定).

Mori.K 等人：“重新考虑珊瑚生长带作为地球测时工具”（Lethaia）。