The Distribution and Activity of Cenozoic Magma Chamber in Tengchong Volcano Area Deduced from the MODIS Multi-Temporal Monthly Night LST Data
详细信息
- 责任者：Li Hui (Earth Science Faulty ; China University of Geosciences ; Wuhan 430074 ; China) ; Peng Songbai
- 刊名：Acta Petrologica Sinica
- 出版年：2011
- 卷期：27(10)
- 关键词：岩浆房 ; magma chambers ; 火山活动 ; volcanicity ; 云南 ; Yunnan Province
- 页码：p.2873-2882
- 图表：6 illus., 37 refs.
- 分类号：1400
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Tengchong volcanic geothermal area is located at the active arc zone of the subduction and collision of the Indian plate and Eurasian plates,and is considered as one of the most potentially active volcanic eruption areas in China.In order to study the spatial distribution and activity of the underground magma chamber,MODIS LST(Land Surface Temperature) data were used to identify the geothermal anomalies that may be created by the heating from the underground magma chamber.The monthly night MODIS LST data from Mar.2000 to Mar.2011 of the study area were collected and analyzed.The 132 month average LST map was derived and three geothermal anomalies were identified.In the light of the previous studies in this area,it can be deduced that there are three magma chambers beneath the three thermal anomalies.The first one is located along Wuhe-Xinhua-Puchuan-Tuantian with the most significant geothermal anomaly,and covers 537km2.The second one is situated in the Langpu-Rehai-Maanshan area with a significant geothermal anomaly and an area of 226km2.The third one is located between Mazhan and Qushi with an obvious geothermal anomaly and a coverage of 28km2.It is also found that the patterns of the monthly LST variation of the three thermal anomalies are similar,with 2 temperature peaks occurring in May,June and August,September,which is different from that of the local temperature of the same period.The 10-year annual LST of the geothermal anomaly in Langpu-Rehai-Maanshan area shows the greatest variations among the three,which suggests the active convective exchange of heat between the underground magma chamber and the surface water,and can be inferred that the beneath this magma chamber is the most active among the three.The findings of this study agree well with the results from seismology,GPS-based deformation detection,He isotopic emission and relative geothermal gradient measurements.It demonstrates the effectiveness and potential of thermal infrared remote sensing in geothermal studies.
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