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**Chapter 9**

**Abstract**

**1. Introduction**

Paleozoic basin system.

Main Features of Sedimentogenesis

The main characteristics of the Late Paleozoic sediments and ecogenesis in the Late Paleozoic basins of Northeast Asia are considered. The authigenic bacterial nature of carbonate bodies, previously considered as detrital, was revealed. The assumption about the lithotrophic nature of the Late Paleozoic ecosystems of the region is substantiated, the basis of the trophic chains of which are prokaryotes. As it turned out, a feature of the Late Paleozoic benthic biota is associated not with climatic factors but with the trophic nature of the communities. Similar types of

**Keywords:** Northeast Asia, Gondwana, late Paleozoic basins, riftogenesis, black shale sedimentology, bacterial carbonate rocks, autolithotrophy, fluidolites, benthic biota

Throughout the Late Paleozoic, there was a large marine basin at the northeast of Asia, with a total area covering about 2,500,000 square meters. Together with the southern part of Taimyr Peninsula, this territory represented a biogeographically and sedimentologically integral system of sedimentary basins, also known as "Taimyr-Kolyma" paleogeographic region, also including Transbaikalia and Northern Mongolia. From the mid-Early Permian, the Taimyr-Kolyma, East European, and West European paleogeographic regions are considered as parts of the Biarmian subregion, framing the modern Arctic [1] (**Figure 1A**). In its main outlines, this system of basins is apparently preserved during the Early Mesozoic. The main features of sedimentary and biotic evolution of the Late Paleozoic basins of the northeast of Asia were connected with the destruction of the Middle Paleozoic continental shelf by establishing rift basins across it [2]. This process started in the mid-Early Carboniferous and, up to the end of the Early Permian, had been accompanied by intense mafic magmatism—the Omolon-Selenyakh volcanic belt of Lychagin and Lyckman [3] (**Figure 2**). By the mid-Middle Carboniferous time, these processes foreordained the general paleogeographic patterns of the Late

According to the features of sedimentation and the appearance of fossil assemblages, three paleogeographic areas can be distinguished within the northeast of Asia: Verkhoyansk-Okhotsk, Kolyma-Omolon, and Novosibirsk-Chukotka subregions [4, 5] (**Figure 1B**). Despite biota was very close in all of them, there are differences

and Ecogenesis in Late Paleozoic

Sea Pools of Northeast Asia

paleoecosystems in the same age layers of Gondwana are indicated.

*Victor Gdal'evich Ganelin*

#### **Chapter 9**
