Environmental Characteristics Of The Late Miocene And The Miocene Stratigraphy And Its Polaroid Combination In The Late Zhaoluoer Mining Area, Inner

Jalainur east open-pit mining area of the quaternary sedimentary is the only one in northeast China is on the late pleistocene lacustrine stratigraphic profile development evolution. Because of the long strip mining, making the strata outcropped and larger range of track can be compared clearly, at the same time, the formation phase change is clear, is rich in cultural preservation(known as \ "jalainur cultural\") and a large number of mammalian fossils, these fossils found for people to understand the evolution of the late pleistocene period animals and the relationship between the orderly change of paleoclimate provides critical clues, is to study the evolution of animal fossils and climate environment ideal profile.Based on sporopollen analysis method to establish the sequence for climate change and s frame of reference, combining the field survey of China’s northeast, we call Aaron lake basin of Inner Mongolia autonomous region in its northeast jalainur region east open-pit mine section thickness is 1396 cm in late quaternary strata samples, obtained 189 samples. In this paper, the our country the earliest, the most complete mammoth fossils unearthed from the fluvial facies sedimentary age and overlying strata formation and the sporopollen 50 samples portfolio analysis. The results showed that: it contains mammoth(we are also found in the process of sampling sinensis, bison fossil) typical fluvial facies sedimentary formation of 51.3 + /- 2.1- to 26.6 + /- 1.2 ka BP(OSL s), after a hiatus, until about 13.55 ka BP to start a new phase of lakes- swamp facies. According to sedimentary characteristics, fluvial facies sedimentary process in 26 to 13.55 after the ka ka BP may be in gas in this region under the environment, did not take deposits but also sustained no significant erosion, denudation, which may be related to the period of time in the last glacial, surface for the cause of the tundra environment. Although river sedimentary phase is generally difficult to save the sporopollen fossil, we still get the certain pollen samples, the analysis results show that the jalainur east open-pit mining area has experienced a typical grassland vegetation, broad leaved forest vegetation mixed woodlands, birch shrub grassland, grassland vegetation is given priority to with birch sparse forest grassland, tundra sparse forest grassland succession process. Ancient vegetation reveals the temperature in the study area is reduced, humidity decreased environmental change process, at the same time, the A/C ratio of reduced effectively also confirmed that the study area environment evolution characteristics of continuous dry climate environment.Mammoth- sinensis(Mammuthus- Coelodonta Fauna) is on behalf of the late pleistocene faunas in the north of China, the cause of her death has been plagued by academic circles. With the end of the ice age, the dramatic changes in the global climate, is due to the transition of primitive human kill or climate mutation mammoth extinctions has no convincing conclusion can make human beings, although the latter has main effect. But still need to through a lot of different indicators(such as lake sediments, microfossil, etc.) to discuss the claim.