Climatic Belts of the Mid-Cretaceous Time
Climatic Belts of the Mid-Cretaceous Time
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发表时间：
1995
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影响因子：
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通讯作者：
N. Chumakov;M. A. Zharkov;A. B. Herman;M. Doludenko;N. N. Kalandadze-N.;E. Lebedev;A. Ponomarenko;A. S. Rautian
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作者：
N. Chumakov;M. A. Zharkov;A. B. Herman;M. Doludenko;N. N. Kalandadze-N.;E. Lebedev;A. Ponomarenko;A. S. Rautian
在白垩纪中期，地球的气候带不同于现在的气候带。在那段时间里，极地地区没有永久冰川和永久冻土。中白垩纪的间断性冰川沉积表明只有短暂的冷却期，这在局部导致了海洋的季节性冻结。中白垩世植被的组成和强烈的煤聚集，以及嗜热昆虫和恐龙的出现，表明了高纬度气候的温带特征。因此，这种奇特的白垩纪中期气候属于温带高纬度气候。它在日照和温度条件上有明显的季节性变化，从适度凉爽到适度温暖（极夜和极日）。如植被类型所示；适温的昆虫;丰富的恐龙;而红土、铝土矿、高岭土、煤炭等矿床的广泛分布，使南北半球中纬度地区的气候条件相对温暖湿润。干旱带也是中白垩纪地球的典型特征。在阿普tian时期，他们占据了几乎所有的低纬度地区和中纬度地区的一些省份。在亚赤道带，湿润阿普梯气候的痕迹是偶发的，只出现在阿拉伯板块的东北部。赤道附近湿润气候带形成较晚，在阿尔布—土鲁尼期；它只存在于冈瓦纳大陆西部。它的出现似乎与南大西洋的开放有关。
In the middle of the Cretaceous period the climatic zonation of the Earth differed from the present zonation. During that time, the polar regions were free from permanent glaciation and permafrost. Episodic glacial deposits of the Middle Cretaceous indicate only short cooling periods, which locally resulted in the seasonal freezing of seas. The temperate character of the high-latitude climate is evident from the composition of Middle Cretaceous vegetation and intense coal accumulation as well as occurrences of thermophilic insects and dinosaurs. Accordingly, this peculiar climate of the mid-Cretaceous was of the temperate, high-latitude type. It had distinct seasonal variations in insolation and temperature conditions that changed from moderately cool to moderately warm (polar nights and days). As indicated by the types of vegetation; thermophilic insects; abundant dinosaurs; and the widespread distribution of laterite, bauxite, kaolin, and coal deposits, the conditions in the middle latitudes of both hemispheres corresponded to a warm humid climate. Arid belts were also typical of the mid-Cretaceous Earth. During the Aptian, they occupied nearly all of the low-latitude zones and some provinces within the middle latitudes. In subequatorial zones, traces of the humid Aptian climate are episodic and occur only in the northeastern Arabian plate. The humid climatic belt near the equator was formed later, during ~he Albian-Turonian interval; it was confined to the western Gondwanan continents only. Its appearance seems to be related to the opening of the South Atlantic Ocean.