Daily and lunar growth features in Carboniferous and Devonian corals from Xinjiang: information about ancient Earth\
首发时间:2009-04-07
Abstract:Research of several precious groups of very fine coral fossils from Xinjiang (groups distributed from 310Ma to 410Ma) which have very clear daily growth lines caused by diurnal increments of calcium carbonate deposition and lunar month bands caused by reproductive cycle provides important information about ancient astronomic data and ancient climate data. At that time, lunar months contained each year seems to be 13.0 instead of the current value 12.37; days contained each year seems to be 388~396 (Carboniferous) or ~407 (Devonian) instead of the current value 365, indicating the slowing down of Earth’s rotation. Moreover, just as recent climate, ancient climate has four seasons, including autumn, winter, spring and summer. But the winter is shorter (59~70 days) and summer is longer (112~125 days). Statistically, we can know a specific day’s climate, cloudy or shining, from diurnal patterns’ characters several hundred million years ago.
keywords: Paleozoic and Mesozoic corals growth pattern biological clock
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新疆石炭纪与泥盆纪珊瑚化石上的月生长与日生长结构:关于古气候与地球自转的信息
摘要:采自新疆的许多保存非常完整精美的石炭纪与泥盆纪珊瑚(共计912枚)携带有完整的日生长线 (16枚),月生长带与年脊(79枚)。日生长线由阳光下的钙质堆积造成,月生长带由珊瑚的繁殖间断造成,年脊由生长密度差异造成。这些周期性生长结构提供了关于古代气候与地球自转的重要信息。与今不同,当时一年包含13.0个朔望月而非现在的12.37个,当时每年有388~396天(石炭纪)或~407天(泥盆纪)而非现在的365天,表明地球自转在减缓。如同今天的气候,古气候同样包括四个季节,但是冬季仅有59~70天,而夏季长达112~125天。统计地说,我们可以通过每日生长线的饱满程度等特征来估计数亿年前某一天的天气情况。
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新疆石炭纪与泥盆纪珊瑚化石上的月生长与日生长结构:关于古气候与地球自转的信息
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