攀西古裂谷区地表热流分布特征及其力学含义
HEAT FLOW PATTERN IN PANXI PALEORIFT ZONE, SW CHINA AND ITS MECHANIAL IMPLICATIONS
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摘要: 攀西古裂谷区11个地表热流数据变化于40——90 mW/m2,平均值为63 mW/m2。 其分布不仅与测点周围的岩石放射性生热率有关,而且与测点到裂谷轴部主干断裂的距离有关。经过分析对比,作者认为这是区内主干断裂自古新世以来持续挤压运动的结果。断裂的压性活动必然伴随着摩擦热的产生,从而引起断裂两侧局部热异常。 摩擦热的大小取决于断裂所处的力学状态,根据盐边-米易-渡口地区的热流资料推测,攀西昔格达断裂昕处的摩擦应力与运动速率v的状态不会超出v=697.4mW/m2和v=396.3mW/m2所限定的范围。Abstract: To date, reliable heat flow values at 11 sites have been obtained in Panxi paleorift zone varying from 40 to 90 mW/m2 with the mean of 6315 mW/m2. Heat flow pattern in Panxi paleorift zone depends not only on the radio-heat generation of the rock strata, but also on the distance between heat flow test sites and the main faults in the central part of the zone. This has been recognized as a result of the compressional movement of the related faults since Paleocene. Compressional slip of a fault must result in the occurence. of frictional heat, leading to the appearence of local thermal anonaly on both sides of the fault. Based on heat flow data at Yanbian-Miyi-Dukou area in the central part of the zone, the relationship between frictional stress () and the slip rate (v) of Xigeda fault (one of the dominant faults in the zone) may be considered to lie betweenv = 697.4mW/m2 andv = 396.3mW/m2
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[17] 从柏林、赵大升、张文华、张兆忠、杨美娥,西昌地区岩浆活动特征及其与构造地质的关系,1973,3; 175——195地质科学.
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[20] Brune, J. N., T. L. Henyey, and R. F. Roy, Heat flow, sues and rate of slip along the San Andress Fault, California,].Gecphys. Res., 1969 74, 3821——3827.
[21] Lachenbruch,A. H., Frictional heating, fluid presure, and the resistance to fault motion, J. Geo phys. Res., 1980, 85, 5679——6112.
[22] 单家增、钟嘉酞、王在中,攀西裂谷的力学成因机制的模型实验,地质科学,1985, 2; 135——144,
[23] 熊绍柏、滕吉文、君周勋、赖明惠、黄一平,攀西构造西带南部地壳上地慢结构的爆炸地震研究,地球物理学报,1986, 29, 235——244,
[24] 骆耀南,中国攀枝花——西昌古裂谷带,中国攀西裂谷文集1, 1——25, 1985,地质出版社.
[25] 国家地震局西南烈度队,西昌——渡口地区地震烈度区划综合研究报告,1977地震出版社.[1] 汪集汤、汪缉安、黄少鹏、张文仁、周友松、金听,攀西古裂谷大地热流测量,科学通报,1986,10; 763——766,
[2] Bitch, F., Roy, R. F. and E. R. Decker, Heat flow and thermal history in New York and New England. In Studies of Appalachian Geology: Northern and Maritime Zen, E., White, W. S., Hadley, J. B. and Thompson, J. B., Jr., eds), 437——451, 1968, Interscience, New York.
[3] Scholz, C. H., Shear heating and the state of stress on faults, J. Ceophys. Res., 1980, 85, 6174——6184.
[4] Brune, J. N., The physics of earthquake strong motion, In: Seismic Risk and Engineering Decision (Lom——nitz, C and E. Rosenhlueth, eds), 141——177, 1976, Elsevier, New York.
[5] Hcny——ey, T, L. and G. L. Wasserburg, Heat flow near major strike——slip faults in California, J. Geophys.Rrs., 1971, 76, 7924——7946.
[6] Sass, J. H., Terrestrial heat flow, Comments on E1rth Sciences: Geophysics, 1970, 1, 8——13.
[7] Lockner, D. A. and P. G. Okubo, Measurements of frictional heating in granite, J. Geophys. Res., 1983,88, 4313——4320.
[8] Cardwell, R. K., D. S. Chinn, G. F. Moore, and D. L. Turcott, Frictional heating on a fault zone with finite thickness, Geaphys. J. R. Astr. Soc., 1978, 52, 525——530.
[9] Lee, T. C., Heat flow through the San——Jacinto fault zone, Southern California, Ceophys. J. R. Astr. Soc.,1983, 72. 721——731.
[10] 汪集肠、汪缉安、黄少鹏、张文仁、周友松、金听,大地热流研究,攀西裂谷研究文集,1988,科学出版社。
[11] 刘秉光、陆德复、徐瑞松、张文华、蒋保林,从卫星影像分析四川省西昌一渡口地区的线性体和主要断裂,中国科学院地质研究所地质科研成果选集,67——71, 1982,文物出版社.
[12] 张树铭、邓志明、纪尚文,应用遥感方法对攀西地区某些地质构造特征的研究,中国攀西裂谷文集1, 55——67,1985,地质出版社.
[13] Jaeger, J. C., Application of the theory of heat conduction to geothermal measurements. In Terrestrial Heat Flow (Lee, W. H. K., ed), 7——23, 1965, American Geophysical Union,Washington, D. C.
[14] 熊亮萍、张菊明,热流折射和再分配的数学模拟,地质科学,1984, 4; 445——454,
[15] Birch, F., Flow of heat in the Front Range, Color.tdo, Bull. Gecl. Soc. Amen, 1950, 61, 567——630.
[16] 袁海华、张树发、张平等,攀西裂谷岩浆岩同位素地质年代学初步研究,中国攀西裂谷文集1,241——257,1985,地质出版社.
[17] 从柏林、赵大升、张文华、张兆忠、杨美娥,西昌地区岩浆活动特征及其与构造地质的关系,1973,3; 175——195地质科学.
[18] 李兴唐、黄鼎成,攀西裂谷区域地质构造,大自然探索,1983, 1; 20——28,
[19] 唐若龙、杨登文、刘述前、王中伟、叶秀华、陈仲禹,攀西裂谷先张后压的双重构造特征,中国攀西文集 , 71——86, 1985,地质出版社.
[20] Brune, J. N., T. L. Henyey, and R. F. Roy, Heat flow, sues and rate of slip along the San Andress Fault, California,].Gecphys. Res., 1969 74, 3821——3827.
[21] Lachenbruch,A. H., Frictional heating, fluid presure, and the resistance to fault motion, J. Geo phys. Res., 1980, 85, 5679——6112.
[22] 单家增、钟嘉酞、王在中,攀西裂谷的力学成因机制的模型实验,地质科学,1985, 2; 135——144,
[23] 熊绍柏、滕吉文、君周勋、赖明惠、黄一平,攀西构造西带南部地壳上地慢结构的爆炸地震研究,地球物理学报,1986, 29, 235——244,
[24] 骆耀南,中国攀枝花——西昌古裂谷带,中国攀西裂谷文集1, 1——25, 1985,地质出版社.
[25] 国家地震局西南烈度队,西昌——渡口地区地震烈度区划综合研究报告,1977地震出版社.
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