雷琼火山区地下深部大地电磁探测与电性结构分析
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摘要
通过大地电磁探测发现,在海口地区地下深部存在两个低阻体(层),其一位于马鞍岭火山及其以西地区地下深部约5km以上,为浅部低阻层,推测为火山喷出玄武岩覆盖体、地下水及其它低阻物质,该低阻层以下为一正在退化的岩浆通道;其二位于琼山7．5级地震区深部约15km以下,为一直通到上地幔的深部低阻体,推测其为一正在上升的岩浆热源,即岩浆囊。另外还发现,琼州海峡南北两侧的地壳和上地幔结构在电性上具有连续性,推测整个雷琼火山区属于同一地质体,佐证了海南岛属于华南古陆的一部分。
It is discovered there exist two kinds of objects(layers)with low resistance by means of magnetotelluric surveying.One of them locates in the place within 5km far from the earth's surface in Ma'anling volcano and its west.It is a shallow layer with low resistance and consists by inference of basalt cover ejected by volcano,underground water and other substance with low resistance.There is a degenerating magma chunnel.Another of them locates in the place under 15km far from the earth's surface in the M7.5 Qiongshan earthquake area.It is a deep layer with low resistance which connects the upper mantle,and is by inference an ascending magma heat-source.In addition,it is found there is electrical continuity from the crust to the upper mantle in the north and south sides of Qiongzhou Straits.It is accordingly inferred that the whole Leiqiong volcanic area is belong to a same geological unit and proved that the Hainan island is one part of the South China ancient continent.
It is discovered there exist two kinds of objects(layers)with low resistance by means of magnetotelluric surveying.One of them locates in the place within 5km far from the earth's surface in Ma'anling volcano and its west.It is a shallow layer with low resistance and consists by inference of basalt cover ejected by volcano,underground water and other substance with low resistance.There is a degenerating magma chunnel.Another of them locates in the place under 15km far from the earth's surface in the M7.5 Qiongshan earthquake area.It is a deep layer with low resistance which connects the upper mantle,and is by inference an ascending magma heat-source.In addition,it is found there is electrical continuity from the crust to the upper mantle in the north and south sides of Qiongzhou Straits.It is accordingly inferred that the whole Leiqiong volcanic area is belong to a same geological unit and proved that the Hainan island is one part of the South China ancient continent.
引文
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[2]张虎男.新构造运动与地震——张虎男论文集[M].北京:海洋出版社,2000.
[3]黄镇国,蔡福祥,韩中元,等.雷琼火山[M].北京:科学出版社,1993.
[4]李红阳,牛树银,王立峰,等.幔柱构造[M].北京:地震出版社,2002.
[5]朱运海.琼北地区地壳垂直形变场[A].丁原章,李坪,时振梁,等.海南岛北部地震研究文集[C].北京:地震出版社,1988.72-77.
[6]赵阳升,万志军,康建荣.高温岩体地热开发导论[M].北京:科学出版社,2004.
[7]刘嘉麒.中国火山[M].北京:科学出版社,1999.
[8]海南百科全书编撰委员会.海南百科全书[M].北京:中国大百科全书出版社,1999.
[9]陈恩民,黄咏茵.1605年海南岛琼州大地震及其发震构造的初步探讨[J].地震地质,1979,1(4): 37-44.
[10]徐起浩.琼山大震沉陷机理讨论[J].华南地震,1985,5(4):30-37.
[11]徐起浩.1605年琼山强地震导致的同震海岸快速下沉、可能紧随的海啸及其证据[J].华南地震,2006, 26(1):17-27.
[12]李志雄,赵文俊,刘光夏.1605年琼山大地震深部构造和应力状态研究[J].华南地震,2006,26(1): 28-36.
[13]TNXOHOB,T.H.,06[J].CCCP,1950,73,2,295-297.
[14]Cagniard L.,Basic theory of the magnetotelluric method of geophysical prospecting[J],Geophysics,1953, 18(3):605-635.
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