The Relationship Between The Volcanism And The Glacier Evolution Of Changbai Mountains In Jilin Since The Late Pleistocene

Changbai Mountains is the largest polygenetic composite central volcano in China, the eruption of history, you can tell by basaltic magma eruption cone-forming stage, composite-cone-forming stage, and ignimbrite-forming eruption (explosive eruption) consisting mainly of modern and historical eruption eruption in three stages, dozens of mercosur in the Pleistocene, advanced out of the rough-alkaline, alkaline rock flow and a small amount of base flow, such as lava rock Heiyao Yan quality and rough volcanic breccia, made up of condensate gray breccia. In addition, the Changbai Mountains (2691 m) is also in eastern China since the late Pleistocene existence of a typical mountain glaciers one of Tianchi Lake in 2000m above sea level around the preservation of more than a good accumulation of glacial erosion and landscape, the volcanic cone in the medial and lateral constitutes a "mouth Extraoral "model of Bingdou glaciers. Glacier relying on the development of the unique volcanic geology and geomorphology background, well-preserved Bingdou, trough, ice Hom, polished surface and ice moraine ridge, the study area showed that at the end of the Ice Age glaciers have many role. Through the ice moraine of optical luminescence (OSL) in the determination of glacier formation and formation of volcanic rocks and the relationship between the K~Ar, high-precision measurement, the imbalance of uranium (TIMS), electron spin resonance (ESR), etc. The results, identified two areas of Changbai Mountain ice into the role that black ice into the outlet, located in the western slope of the volcanic cone and the northern slope of 2000~2100 m above sea level, ice into the period for about 20 ka ago, the peak of the last ice (LGM) the product of ice into the station, for the distribution of 2400~2600 m above sea level, the role of glaciers in the 11 ka before and after a night of the Ice Age.Although the Changbai Mountain is a historical period until there are activities of the volcano, the eruption of volcanic activity and the damage and cover up a considerable part of ancient glacial relics, but the Holocene Ice Rink group of not more than the total thickness of 60 m, the volcanic eruption of thin it will be difficult to Glacier erosion of terrain to cover up completely. Changbai Mountain is today's landscape has undergone ice and fire and then formed after the baptism.In a similar system under the influence of monsoon (rain and snow of winter), the Changbai Mountains, at the end of the Ice Age glaciers and the sequence of other glaciers of the East Asia coastal regions, such as Taiwan, Japan, coupled with a certain time and space, but is likely due to the latter part of the volcanic eruption of violent But not found at the end of the Ice Age, the early stage (MIS3/4) ice into the role of the relics.