Abstract

The majority of fossil floras from Cretaceous volcanogenic rocks of Northeast Russia considerably differ in taxonomy from the coeval paleofloras of coastal lowlands. In order to explain the peculiarities of their formation, we used the data on the modern vegetation dynamics for volcanic plateaus of Central Kamchatka. It is shown that there was virtually no erosion where paleofloras of the Okhotsk-Chukotka volcanogenic belt, represented in the burials, existed; however, volcanogenic material, suitable for burials to form, was supplied in abundance. After massive eruptions, inner parts of the vast volcanic zone appeared to be isolated from sources of diaspores. Vegetation cover in these areas was restored mainly owing to the pool of local taxa; i.e., it was supported as a diasporic subclimax. The absence of concurrent angiosperms favored the long-term preservation of ancient taxa in these paleofloras and the appearance of new taxa on their basis.

中文翻译：

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俄罗斯东北部非海洋白垩纪地层相关性问题：火山区成岩条件

摘要

来自俄罗斯东北部白垩纪火山岩的大多数化石植物群在分类学上与沿海低地的古古生物群大不相同。为了解释其形成的特殊性，我们使用了堪察加中部火山高原的现代植被动力学数据。结果表明，以埋葬为代表的鄂霍次克—楚科奇火山火山带古生物几乎没有存在。但是，大量供应了适合于墓葬形成的火山物质。大规模喷发后，广阔的火山带内部似乎与渗流源隔离。这些地区的植被得到了恢复，这主要是由于当地生物群的聚集；即，它被作为流散亚高潮被支持。