祁连山—河西走廊地壳速度结构及速度与电性的联合解释
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摘要
联合利用天然地震和人工地震测深资料对祁连山—河西走廊地区进行地壳三维速度结构反演，获得了该区地壳三维速度结构图像．给出了按5km间隔的中、上地壳速度切面和地壳速度结构与莫霍界面等深线图．综合大地热流实测结果和深部岩石物性等，建立了下地壳部分熔融的韧性模型．给出了计算地震波速度和电阻率的方法与公式，进行了部分熔融状态下深部电性与地震波速度的联合数值模拟和联合解释，其结果与实测的基本一致．分析了各构造单元之间下地壳电阻率、速度与热流的关系，对下地壳部分熔融程度进行了估计．
The 3-D crustal velocity structure and tomographic image, including sectionvelocity from surface to 25km with interval 5km, RMS velocity in crust and depthdistribution of Moho, in Qilianshan Mountain--Hexi Corridor inversed by earthquakesconsotrainted with DSS data was gotAftor consideration of heat flow and rock physical properties, the ductile modelwith partial melting of lower crust was set up. The method and mathematicalrepresentations to calculate seismic velocity and tesistivity were shown. Thesimultaneous numerical modelling of velocity and resistivity was calculated and thecombined interpretation of it was performed by means of geotherm, the theoreticalresults agree basically with practical data. The relationship of electric conductivity,velocity and heat flow among various geological units was analysed and the partialmelting degree was got This is first research results for the Northern .Margin ofQinghai-Xizang (Tibet) Plateau, and is important for understanding of the evolutionand dynamics of Qinghai--Xizang (Tibet) Plateau.
The 3-D crustal velocity structure and tomographic image, including sectionvelocity from surface to 25km with interval 5km, RMS velocity in crust and depthdistribution of Moho, in Qilianshan Mountain--Hexi Corridor inversed by earthquakesconsotrainted with DSS data was gotAftor consideration of heat flow and rock physical properties, the ductile modelwith partial melting of lower crust was set up. The method and mathematicalrepresentations to calculate seismic velocity and tesistivity were shown. Thesimultaneous numerical modelling of velocity and resistivity was calculated and thecombined interpretation of it was performed by means of geotherm, the theoreticalresults agree basically with practical data. The relationship of electric conductivity,velocity and heat flow among various geological units was analysed and the partialmelting degree was got This is first research results for the Northern .Margin ofQinghai-Xizang (Tibet) Plateau, and is important for understanding of the evolutionand dynamics of Qinghai--Xizang (Tibet) Plateau.
引文
1 国家地震局地质研究所,国家地震局兰州地震研究所.祁连山—河西走廊活动断裂系.北京:地震出版社,1993
2 张云琳,安海静,刘晓玲等.祁连山中西段MT剖面透视与研究见:河西祁连山中段地震危险基础研究.北京:地震出版社, 1994. 27—45
3张少泉,武利均,郭建明等.中国西部地区门源—平凉—渭南地震测评剖面资料的分析解释地球物理学报,1985,28:461—472
4 王泽九,吴功建,肖序常.格尔本—额济纳旗地学断面多学科综合调查研究概况.地球物理学报,1995,38(增刊 Ⅱ) 6—7
5 刘福田 震源位置和速度结构的联合反演(1)—理论和方法.地球物理学报,1984,27:167—175
6 吴建春.CT技术在新丰江台网中的应用,中国地震,1990,6(4):84—92
7 王周元.甘肃地区分层地壳模型.西北地震学报,1984,6:84—91
8Schmeling H Numerical models on the influence of partial I: elashcity and anelasticity. Phys. Earth Planet.Inter., 1985, 41:34—57
9 Schmeling H. Numerical models on the influence of edical melt on elashc, anelastic and electricalproperties of rocks. Part II: Electrical conductivity Phys Earth Planet Inter, 1986, 43, 123—136
10Walsh J B. New analysis of attenuation in partially melted reock J .Geophys . Res, 1969, 74,4333—4337
11 Waff H S. Theoretical considerations of electrical conductivity in apartially molten mantle and implications foF geothermometry J. Geophys ,. Res,1974, 79:4003—4010
12 Feldman I S .On the nature of conductive layers in the erth's crust adn upper mantle In:Geoelectric and Geothermal Studies .Budapest : Akademiai Kiado , 1976. 721—730
13 Main A.Geothermal effects in the formation of electrically conducting zones and temperature distribution in the earth. Phys Earth Planet Inter,1978, 17: 21—28
14 Walsh J B. The effect of cracks on the compressibility of rocks. J. Geophs. Res, 1965, 70: 381—389
15Gassmarnn G Uber die elastizitat poroser medien Vieteljahresschr .Zuerch .Natureforsch .Ges .1951,96: 1—21
16 Grant F S, West G F. Interpretation Theory in Applied Geophysics. New York: Me Graw-Hill Book Comp,1965.583
17 Krajew A P, Grundlapen der Geoelektriuk. Berlin: Veb Veriag Technik 1957
18 沈显杰,杨淑贞,沈继英等.格尔木—额济纳旗热流剖面及壳幔温度正演计算.科学通报,1995,40:639— 642
19 Waff H S, Bulau J K Equilibrium fluid distribution in an ultramafic partial melt under hydrostatic stressconditions. J Geophs Res、 1979, 79: 4003—4010
20 Mavko G M. Velocity and attenuation in partially molten rocks. J. Geophys Res、1980, 85: 5173—5189
21 Dziewonski A M Anderson D L. Prelimiary Reference Earth Model .Phys Earth Planet Inter 1981, 25:297—356
2 张云琳,安海静,刘晓玲等.祁连山中西段MT剖面透视与研究见:河西祁连山中段地震危险基础研究.北京:地震出版社, 1994. 27—45
3张少泉,武利均,郭建明等.中国西部地区门源—平凉—渭南地震测评剖面资料的分析解释地球物理学报,1985,28:461—472
4 王泽九,吴功建,肖序常.格尔本—额济纳旗地学断面多学科综合调查研究概况.地球物理学报,1995,38(增刊 Ⅱ) 6—7
5 刘福田 震源位置和速度结构的联合反演(1)—理论和方法.地球物理学报,1984,27:167—175
6 吴建春.CT技术在新丰江台网中的应用,中国地震,1990,6(4):84—92
7 王周元.甘肃地区分层地壳模型.西北地震学报,1984,6:84—91
8Schmeling H Numerical models on the influence of partial I: elashcity and anelasticity. Phys. Earth Planet.Inter., 1985, 41:34—57
9 Schmeling H. Numerical models on the influence of edical melt on elashc, anelastic and electricalproperties of rocks. Part II: Electrical conductivity Phys Earth Planet Inter, 1986, 43, 123—136
10Walsh J B. New analysis of attenuation in partially melted reock J .Geophys . Res, 1969, 74,4333—4337
11 Waff H S. Theoretical considerations of electrical conductivity in apartially molten mantle and implications foF geothermometry J. Geophys ,. Res,1974, 79:4003—4010
12 Feldman I S .On the nature of conductive layers in the erth's crust adn upper mantle In:Geoelectric and Geothermal Studies .Budapest : Akademiai Kiado , 1976. 721—730
13 Main A.Geothermal effects in the formation of electrically conducting zones and temperature distribution in the earth. Phys Earth Planet Inter,1978, 17: 21—28
14 Walsh J B. The effect of cracks on the compressibility of rocks. J. Geophs. Res, 1965, 70: 381—389
15Gassmarnn G Uber die elastizitat poroser medien Vieteljahresschr .Zuerch .Natureforsch .Ges .1951,96: 1—21
16 Grant F S, West G F. Interpretation Theory in Applied Geophysics. New York: Me Graw-Hill Book Comp,1965.583
17 Krajew A P, Grundlapen der Geoelektriuk. Berlin: Veb Veriag Technik 1957
18 沈显杰,杨淑贞,沈继英等.格尔木—额济纳旗热流剖面及壳幔温度正演计算.科学通报,1995,40:639— 642
19 Waff H S, Bulau J K Equilibrium fluid distribution in an ultramafic partial melt under hydrostatic stressconditions. J Geophs Res、 1979, 79: 4003—4010
20 Mavko G M. Velocity and attenuation in partially molten rocks. J. Geophys Res、1980, 85: 5173—5189
21 Dziewonski A M Anderson D L. Prelimiary Reference Earth Model .Phys Earth Planet Inter 1981, 25:297—356
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