济阳坳陷岩石圈热结构的二维模拟
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摘要
基于济阳坳陷的深反射/折射地震测深资料以及华北地区地温场资料和地震波速度(vp)与放射性生热率(A)的实验关系,建立了二维稳态热传导模型,模拟了济阳坳陷岩石层温度分布.研究表明:壳幔边界温度与地壳厚度密切相关,地壳厚度大的地区壳幔边界温度相对较高,约为600~650℃,地壳厚度小的地区壳幔边界温度相对较低,在510~550℃之间;该地区居里面深度在30 km左右,与Moho面的深度近似;计算得到该地区热岩石圈厚度在81~102 km之间,其分布形态与莫霍面的分布形态相近.
Based on the information of deep reflection and refraction in Jiyang depression,along with the ground temperature data and seismic waves speed in experiment connection with the radioactivity heat production rate,the study sets up a 2-dimension firm-state heat exchange model and simulates geosphere temperature of Jiyang depression.It shows crust-mantle boundary temperature has a close connection with thickness of the earth's crust,the deeper thickness of lithosphere,the higher temperature of crust-mantle,about 600~650°C,the temperature in thin lithosphere area is relatively low,between 510°C and 550°C.The depth of Courier surface in this area is around 30km,just about the depth of Moho surface.Calculation result shows the thickness of geosphere is between 81 km and 102 km,of which distributing configuration is like distributing of Moho.
Based on the information of deep reflection and refraction in Jiyang depression,along with the ground temperature data and seismic waves speed in experiment connection with the radioactivity heat production rate,the study sets up a 2-dimension firm-state heat exchange model and simulates geosphere temperature of Jiyang depression.It shows crust-mantle boundary temperature has a close connection with thickness of the earth's crust,the deeper thickness of lithosphere,the higher temperature of crust-mantle,about 600~650°C,the temperature in thin lithosphere area is relatively low,between 510°C and 550°C.The depth of Courier surface in this area is around 30km,just about the depth of Moho surface.Calculation result shows the thickness of geosphere is between 81 km and 102 km,of which distributing configuration is like distributing of Moho.
引文
[1]迟清华,鄢明才.华北地台岩石放射性元素与现代大陆岩石圈热结构和温度分布[J].地球物理学报,1998,41(1):39-48.
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[3]龚育龄,王良书,刘绍文,等.济阳坳陷地幔热流和深部温度[J].地球科学,2005,30(1):121-128.
[4]龚育龄,王良书,刘绍文,等.济阳坳陷地温梯度分布特征[J].地球物理学报,2003,46(5):652-658.
[5]张成科,张先康,赵金仁,等.渤海湾及其邻区壳幔速度结构研究与综述[J].地震学报,2002(4):428-435.
[6]龚育龄,王良书,刘绍文,等.济阳坳陷大地热流分布特征[J].中国科学D辑,2003,33(4):384-391.
[7]Rybach L,Buntebarth G.The variation of heat genora-tion,density and seismic velocity with rock type in thecontinental lithosphere[J].Tecionohysics,1984,103:335-344.
[8]汪集?.辽河裂谷盆地地壳上地幔热结构[J].中国科学,1986(8):856-866.
[9]Rybach L,Pmuffler L J.地热系统———原理和典型地热系统分析[M].北京大学地质系地热研究室译.北京:地质出版社,1986.
[10]Cermak V,bodri L,Rybachi,L.Radioactive heat pro-duction in the continental crust and its depth dependence in[C].V.cermak and Rybach.L.(Ed.),Heatflow and lithosphere structure,springer,heidelberg,1991.
[2]陈墨香.华北地热[M].北京:科学出版社,1988.
[3]龚育龄,王良书,刘绍文,等.济阳坳陷地幔热流和深部温度[J].地球科学,2005,30(1):121-128.
[4]龚育龄,王良书,刘绍文,等.济阳坳陷地温梯度分布特征[J].地球物理学报,2003,46(5):652-658.
[5]张成科,张先康,赵金仁,等.渤海湾及其邻区壳幔速度结构研究与综述[J].地震学报,2002(4):428-435.
[6]龚育龄,王良书,刘绍文,等.济阳坳陷大地热流分布特征[J].中国科学D辑,2003,33(4):384-391.
[7]Rybach L,Buntebarth G.The variation of heat genora-tion,density and seismic velocity with rock type in thecontinental lithosphere[J].Tecionohysics,1984,103:335-344.
[8]汪集?.辽河裂谷盆地地壳上地幔热结构[J].中国科学,1986(8):856-866.
[9]Rybach L,Pmuffler L J.地热系统———原理和典型地热系统分析[M].北京大学地质系地热研究室译.北京:地质出版社,1986.
[10]Cermak V,bodri L,Rybachi,L.Radioactive heat pro-duction in the continental crust and its depth dependence in[C].V.cermak and Rybach.L.(Ed.),Heatflow and lithosphere structure,springer,heidelberg,1991.
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