残余壳根与“三明治”结构——燕山造山带中段地壳结构的主要特征
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摘要
昌黎—承德—达莱诺尔宽角反射/折射地震剖面完成于1985年,呈NW向横过燕山造山带中段,部分测段与2002年实施的120km深反射地震剖面重合。为获得区域深部构造背景并在与反射地震剖面交互解释基础上,对该剖面的4炮原始资料进行了处理、解释,获得了一个厚35~38km,局部残余壳根,夹有低速层的"三明治"式的地壳结构模型。该结构样式明显不同于板缘俯冲/碰撞造山带常见的楔入(挤入)样式,也区别于澳大利亚AliceSpring造山带的厚皮变形样式,在世界陆内造山带中独具特色。燕山造山带的地壳结构模型暗示该区保持着中生代区域收缩变形形成的地壳结构基本格架,下地壳和Moho的特征显示了后期区域性伸展作用的影响。
The Changli-Chengde-Dalainuoer wide-angle/refraction seismic profile completed in 1985 extends northwestward across the Yanshan orogen. It is partly overlapped by a reflection seismic profile completed in 2002. For the purpose of understanding the regional deep tectonic setting and on the basis of interactive interpretation between the near-vertical reflection profile and the wide-angle reflection profile, this paper dealt with four shot data from the profile. As a result, a sandwich style crust structure model of the remainder crustal root 35～38 km in thickness intercalated with an intracrust lower velocity layer was obtained. This pattern is evidently different from the diagram of wedge /insert that often appears under the interplate underthrust or collision orogen, and is also different from the 'thick-skinned' pattern under the Alice Spring orogen of Australia, thus having its distinct features in the intra-continent orogenic belts of the world. The crustal structure suggests that the framework formed by Mesozoic regional contraction deformation was preserved in the Yanshan orogen. Nevertheless, characteristics of the lower crust and Moho indicate the existence of the influence of late regional stretching.
The Changli-Chengde-Dalainuoer wide-angle/refraction seismic profile completed in 1985 extends northwestward across the Yanshan orogen. It is partly overlapped by a reflection seismic profile completed in 2002. For the purpose of understanding the regional deep tectonic setting and on the basis of interactive interpretation between the near-vertical reflection profile and the wide-angle reflection profile, this paper dealt with four shot data from the profile. As a result, a sandwich style crust structure model of the remainder crustal root 35～38 km in thickness intercalated with an intracrust lower velocity layer was obtained. This pattern is evidently different from the diagram of wedge /insert that often appears under the interplate underthrust or collision orogen, and is also different from the 'thick-skinned' pattern under the Alice Spring orogen of Australia, thus having its distinct features in the intra-continent orogenic belts of the world. The crustal structure suggests that the framework formed by Mesozoic regional contraction deformation was preserved in the Yanshan orogen. Nevertheless, characteristics of the lower crust and Moho indicate the existence of the influence of late regional stretching.
引文
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张成科,张先康,赵金仁,任青芳,张建狮,海燕.2002.渤海湾及其邻区壳幔速度结构研究与综述[J].地震学报,24(4):428~438.
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张先康,李松林,王夫运,嘉世旭,方盛明.2003.青藏高原东北缘、鄂尔多斯和华北唐山震区的地壳结构差异[J].地震地质,25(1):51~60.
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郑亚东,Davis G A,王琮,Darby BJ,张长厚.2000.燕山带中生代主要构造事件与板块构造背景问题[J].地质学报,74(4):289~302.
中国地震局地球物理勘探大队.1985.昌黎—承德—达莱诺尔深地震测深剖面报告[R].
祝治平,张先康,张建狮,张成科,赵金仁,盖玉杰.1997.北京-怀来-丰镇剖面地壳上地幔构造与速度结构研究[J].地震学报,19(5):499~505.
BERZI N R,ONCKEN O,KNAPPJ,et al.1996.Orogenic evolutionof the Ural Mountains:results fromanintegrated seismic experi-ment[J].Science,274:220~221.
CHEN A.1998.Geometric and Kinematics evolution of basement-coredstructures:intra-plate orogenesis within the Yanshan orogen,northern China[J].Tectonophysics,305(1-3):165~181.
CLOWES R M,BRANDON M T,GREEN A G,et al.1988.LITHOPROBE-southern Vancouver Island:Cenozoic subductioncomplexi maged by deep seismic reflections:reply[J].CanadianJournal of Earth Sciences,25:164~165.
DAVIS G A,WANG Cong,ZHENG Yadong,et al.1998.The enig-matic Yanshan fold-and-thrust belt of northern China:new viewsonits intraplate contrational styles[J].Geology,26:43~46.
DENGJinfu,ZHAO Guochun,SU Shangguo,LI U Cui,CHEN Yi-han,LI Fangning,ZHAO Xingguo.2005.Structure overlap andtectonic setting of Yanshan Orogenic Belt in Yanshan Area[J].Geotectonica et Metallogenia,29(2):157~165(in Chinese withEnglish abstract).
DENGJinfu,ZHAO Guochun,ZHAO Hailing,LUO Zhaohua,DAIShengqian,LI Kai ming.2000.Yanshanian Igneous PetrotectonicAssemblsge and Orogenic-Deep processin Esat China[J].Geolog-ical Review,46(1):41~48(in Chinese with English abstract).
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FENG Rui.1987.Synthesis studying onlithopsheric tectonic of North-ern China[J].Science Bulletin of China,(22):18~23(in Chi-nese with English abstract).
GAO Rui,LI Qiusheng,ZHAO Yue,ZHANG Jisheng,GUAN Ye,BAI Jin,WU Hai,ZHANG Shuanhong,HUJianmin,LI Peng-wu,WANG Haiyan,HE Rizheng.2002.Starting of the DeepSeismic Reflection Profiling across Yanshan Orogenn belt[J].Geological Bulletin of China,21(12):905~906(in Chinese withEnglish abstract).
HOLBROOK W H,MOONEY W D,CHRISTENSEN N I.1992.The seismic velocity structure of the deep continental lower crust,In:Fountion D M et al.Eds.,Developments in Geotectonics[M],23:1~43.
JIAShixu,ZHANG Xiankang.2005.Crustal structure and comparisonof different tectonic blocks in North China[J].Chinese J.Geo-phys,48(3):611~620(in Chinese with English abstract).
LI U Yike,CHANG Xu.2001.3-D Tomographic I mages and DeepOre-Control in Northern Margin of the North China Plate[J]Resource Geology,51(4):401~406.
LU Zaixun,XIA Huaikuan.1994.Geoscience Transect from DongUji muqin Qi(Inner Mongolia)to Donggou(Liaoning)[J].Chi-nese Journal of Geophysics,37(2):259~268(in Chinese withEnglish abstract).
MA Yinsheng,WU Manlu,ZENG Qingli.2002.The Mesozoic-Ceno-zoic compression and extension transformation prosess and ore-forming process in Yanshan and adjacent area[J].Acta Geoscien-tia Sinica,23(2):115~122(in Chinese with English abstract).
MAZongjin,ZHAO Junmeng.1999.Contrast Research on TianshanOrogenic Belt and Yinshan-Yanshan Oorogenic Belt[J].EarthScience Frontiers-Journal of China university of geosciences,6(3):95~102(in Chinese with English abstract).
OLI VERJ E,COOK F A,BROWN L D.1983.COCORP and theContinental crust[J].Journal of Geophysical Research,88:3329~3347.
RENJ Y,TAMAKI K,LI S T,et al.2002.Late Mesozoic and Ceno-zoic rifting and its dynamic setting in Eastern China and adjacentareas[J].Tectonophysics,344(3-4):175~205.
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