南华北盆地群岩石圈热-流变结构
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摘要
结合南华北盆地群现代地温场资料和深部地震测深资料及岩石热物性参数,对南华北盆地群的热结构进行了研究。结果表明,南华北盆地群平均热流值为53.7mW/m2,地幔热流为30~34mW/m2,莫霍面温度为500~550℃,热岩石圈厚度为110~130km。在此基础上,进行了岩石圈流变模拟,探讨了研究区的岩石圈流变特征及其地球动力学意义。南华北盆地群岩石圈强度为(7.6~23.3)×1012N/m,具有显著的"三明治"结构。上地壳表现为脆性变形,中、下地壳为韧性的流动变形。这一分层变形机制决定了南华北盆地群的成盆演化动力学过程。
Based on the data of geo-temperature and rock thermophysical parameters and geophysical data collected from the South Huabei basins, the thermal structure of this region is analyzed. The results show that the average heat flow value of the South Huabei basins is 53.7 mW/m2 , the values of mantle heat flow vary from 30 mW/m2 to 34 mW/m2 , the temperatures of Moho vary from 500℃ to 550℃, and the thicknesses of thermal lithosphere are between 110 km and 130 km . Furthermore, integrated with the lithospheric rheological modeling, the rheological features of the lithosphere and its geodynamic signification in study area are also discussed. The lithosphere strength of the South Huabei basin is about (7.6~23.3)×10 12 N/m . The lithosphere beneath the South Huabei basins has a obvious sandwich-like structure: The upper crust is in the brittle field; The middle crust and the lower crust is in the ductile field. This kind of stratified deformation mechanism is the controlling factor for the geodynamic process of the basins formation and evolution.
Based on the data of geo-temperature and rock thermophysical parameters and geophysical data collected from the South Huabei basins, the thermal structure of this region is analyzed. The results show that the average heat flow value of the South Huabei basins is 53.7 mW/m2 , the values of mantle heat flow vary from 30 mW/m2 to 34 mW/m2 , the temperatures of Moho vary from 500℃ to 550℃, and the thicknesses of thermal lithosphere are between 110 km and 130 km . Furthermore, integrated with the lithospheric rheological modeling, the rheological features of the lithosphere and its geodynamic signification in study area are also discussed. The lithosphere strength of the South Huabei basin is about (7.6~23.3)×10 12 N/m . The lithosphere beneath the South Huabei basins has a obvious sandwich-like structure: The upper crust is in the brittle field; The middle crust and the lower crust is in the ductile field. This kind of stratified deformation mechanism is the controlling factor for the geodynamic process of the basins formation and evolution.
引文
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臧绍先,李昶,宁杰远,等.2002.华北岩石圈三维流变结构的一种初步模型.中国科学(D辑),32(7):588597.[Zang Shaoxian,Li Chang,Ning Jieyuan,et al.2002.A preliminarymodel for3-D rheological structure of the lithosphere in NorthChina.Science in China(D),32(7):588597(in Chinese)]
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陈沪生,周雪清,李道琪,等.1993.中国东部灵璧-奉贤(HQ-13)地学断面图.北京:地质出版社.[Chen Husheng,Zhou Xueqing,Li daoqi,et al.1993.Geosciencetransect of Lingbi-Fengxian(HQ-13)in eastern China.Beijing:Geological Press(in Chinese)]
迟清华,鄢明才.1998.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.地球物理学报,41(1):3848.[Chi Qinghua,Yan Mingcai.1998.Radioactive elements of rocks innorth China platform and the thermal structure and temperaturedistribution of the modern continental lithosphere.Chinese J.Geophys.,41(1):348(in Chinese with English abstract)]
龚育龄,王良书,刘绍文,等.2003.济阳坳陷大地热流分布特征.中国科学(D),33(4):384391.[Gong Yuling,Wang Liangshu,Liu Shaowen,et al.2003.Distributioncharacteristics of heat flow densities in Jiyang depression,Shandong,north China.Science in China(D),33(4):384391(in Chinese)]
胡圣标,何丽娟,汪集.2001.中国大陆地区大地热流数据汇编(第三版).地球物理学报,44(5):611626.[Hu Shengbiao,He Lijuan,Wang Jiyang.2001.Compilation of heatflow data in the China continental area(3rd edition).Chinese J.Geophys.,44(5):611626(in Chinese with English abstract)]
Kirby S H.1983.Rheology of the lithosphere.Rev.Geophys.,21:14581487.
Kusznir N J,R G Park.1986.Continental lithosphere strength:thecritical role of lower crustal deformation.In:Dawson J B,et al.,eds.The Nature of the Continental Lower Crust.Geol.Soc.Spec.Pub.,24:7993.
刘绍文.2004.中国东西部中国大陆东、西部岩石圈热-流变结构及其对晚新生代变形的制约[博士论文].南京:南京大学地球科学系.[Liu Shaowen.2004.Thermo-rheological structure of continentallithosphere in western and eastern China:Constraints on the lateCenozoic deformation[Thesis for Doctor degree].Nanjing:EarthSciences Department of Nanjing University(in Chinese)]
刘绍文,王良书,李成,等.2003.塔里木北缘岩石圈热-流变结构及其地球动力学意义.中国科学(D辑),33(9):852863.[Liu Shaowen,Wang Liangshu,Li Cheng,et al.2003.Thermal-rheology structure of the lithosphere beneath north Tarim and itsgeodynamic implications.Science in China(D),33(9):852863(in Chinese)]
Morgan P,Gosnold W D.1989.Heat flow and thermal regimes in thecontinental United States,Geol.Soc.Amer.,Memoir.172:493521.
Pollack H N,Hurter S J and Johnson J R.1993.Heat flow from theEarth's interior:Analysis of the global data set,Rev.Geophys.,31:267280.
Ranalli G.1997.Rheology of the lithosphere in space and time.In:Burg J P,M Ford eds.Orogeny through time.Geol.Soc.Spec.Pub.,121:1937.
Sibson R H.1974.Frictional constraints on thrust,wrench and normalfaults.Nature,249:542544.
Wang Jiyang.1996.Geothermics in China.Beijing:Seismological Press.
汪集,黄少鹣.1990.中国大陆地区大地热流数据汇编(第二版).地震地质,12(4):351366.[Wang Jiyang,Huang Shaopeng.1990.Compilation of heat flowdata inthe China continental area(2nd Edition).Seismology andGeology,12(4):351366(in Chinese with English abstract)]
王均,黄尚瑶,黄歌山,等.1990.中国地温分布的基本特征.北京:地震出版社.[Wang Jun,Huang Shangyao,Huang Geshan,et al.1990.BasicCharacteristics of the Earth's Temperature Distribution in China.Beijing:Seism.Press(in Chinese)]
Xu Y G.2001.Thermo-tectonic destruction of the Achaean lithospherickeel beneath the Sino-Korean Craton in China:Evidence,timingand mechanism.Physics and Chemistry of the Earth,26(910):747757.
臧绍先,刘永刚,宁杰远.2002.华北地区岩石圈热结构的研究.地球物理学报,45(1):5666.[Zang Shaoxian,Liu Yonggang,Ning Jieyuan.2002.Thermal structureof the lithosphere in north China.Chinese J.Geophys.,45(1):5666(in Chinese with English abstract)]
臧绍先,李昶,宁杰远,等.2002.华北岩石圈三维流变结构的一种初步模型.中国科学(D辑),32(7):588597.[Zang Shaoxian,Li Chang,Ning Jieyuan,et al.2002.A preliminarymodel for3-D rheological structure of the lithosphere in NorthChina.Science in China(D),32(7):588597(in Chinese)]
周永胜,何昌荣.2003.地壳主要岩石流变参数及华北地壳流变性质研究.地震地质,25(1):109122.[Zhou Yongsheng,He Changrong.2003.Rheological parameters ofcrustal rocks and crustal rheology of north China.Seismology andGeology,25(1):109122(in Chinese with English abstract)]
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