Ar ar dating of basalts

The Holocene volcanoes are mainly located in Changbaishan (Ever-white Mountains), Jingbohu (Mirror Lake), Wudalianchi (Five connected Ponds), Tengchong County in Yunnan and Yutian County in Xinjiang Region. (2002) published a paper summarizing the main features and hazard problems for the three active volcanoes in China.

Liu Jiaqi (1999, 2001), Liu Ruoxin (2000), Huangfu and Jiang (2000) summarized also some of the key features of the active volcanoes, as well as Liu Jiaqi et al.

After describing the geologic evolution of Datun volcano, Song Shengrong points out Datun volcano is in its active state based on the seismic, fumarole gases and geothermal studies from his colleagues.

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For a purpose of public education in volcano, the authors in the book introduced also the common knowledge on the general feature of a volcano as well as some beautiful myths and legends of volcanic eruption.The caldera lake, Tianchi, possesses a significant hydrological hazard with its 2 km water.Floods triggered by either eruption or landslide into the caldera lake could have devastating effects to the three water channel systems headed from the volcano. (1999) briefly summarized the volcanic hazard problems concerning the 4 volcanic centers in northeast China while Yang et al.(2001) contributed the three ash layers in the ODP 1143 drilling site in the South China sea to the Quaternary eruption from Toba volcano (YTT, OTT, and HDT) respectively. (2002) compared the ash shards in the maar deposits at Huguangyan volcano to the Toba 74000 a BP eruption. (2002) summarized the physical volcanology and hazard assessment for the three volcanoes in China (Tianchi volcano in Changbaishan, Tengchong volcano in Yunnan and Wudalianchi volcano in Heilongjiang).This let them conclude that a much wider dispersion area for the Toba eruption and a sedimentation rate for the loose deposits in the crater lake. The polygenic central volcano, Tianchi volcano (also called Baitoushan volcano, White Head Mountain), had a plinian column height of 35 km (H) and possess a probability between 1 in 5 to 1 in 10 for the next eruption to happen in the next 100 years (Wei et al., 1999, Wei et al., 2002).

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