Discussion on Genetic Mechanism of Hornitos in Wudalianchi Volcanic Field
详细信息
- 责任者：Gao Weiyan (Key Laboratory of Orogenic Belts and Crustal Evolution ; Ministry of Education ; School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Li Jianghai
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(1)
- 关键词：五大连池火山群 ; Wudalianchi Volcano Group ; 火山地貌 ; volcanic features
- 页码：p.309-317
- 图表：1 1illus., 15 refs.
- 分类号：1400
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Majority of l 537 hornitos in Wudalianchi volcanic field distribute in lava flows of Huoshaoshan．After morphologic and concentrated distribution characteristic analysis, it comes to the conclusion that vapor in mixed gas is dominant in the formation of hornito and gravity is also of some importance to shape a hornito．When the basic lava with volatile overflowed near to water area，the surface of lava condensated and consolidated while inside remained high temperature and low viscosity．Mixed gas containing volcanic gas and vapor started to aggregate after lava meeting groundwater，and intermittently broke surface of lava to escape，together with some lava spattering up and stacking around the vent to form a hornito，the inside of which stayed hollow as the route way for gas to escape．When air pressure failed to eject lava from top jet，growth of a hornito ended．