| 桂西北二叠纪灰岩墙(脉)的地震成因解释 |
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| 引用本文： | 乔秀夫,彭阳,高林志.桂西北二叠纪灰岩墙(脉)的地震成因解释[J].地质通报,2002,21(2). |
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| 作者姓名： | 乔秀夫 彭阳 高林志 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 中国地质科学院地质研究所,北京,100037;北京大学地球与空间科学学院,北京,100871 |
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| 基金项目： | 国家科学技术部“九五”攀登专项(批准号95-专-04)。 |
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| 摘 要： | 广西西北部的泥盆纪灰岩中发育大量产状直立的二叠纪茅口组的碳酸盐岩岩墙,其成因一直引起地质学家的兴趣。本文尝试用地震灾变事件解释这一奇特的地质现象,即:二叠纪强地震发生时,茅口组未成岩的软沉积物中产生的液化沉积物流借助上覆沉积物的压力,贯入下伏已成岩的坚硬的泥盆系灰岩的裂隙(断层、节理等)中,形成具直立层理的灰岩墙(脉)。上述过程反映一次强地震灾变事件作用在软沉积物与坚硬岩层中的不同响应。
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| 关 键 词： | 广西凌云 灰岩墙(脉) 地震灾变事件 液化沉积物流 |
Interpretation of the seismic origin of Permian limestone dikes in northwestern Guangxi |
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| Qiao Xiufu Peng Yang,Gao Linzhi.Interpretation of the seismic origin of Permian limestone dikes in northwestern Guangxi[J].Geologcal Bulletin OF China,2002,21(2). |
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| Authors: | Qiao Xiufu Peng Yang Gao Linzhi |
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| Abstract: | Many vertical limestone dykes of the Permian Maokou Formation are developed in Devonian limestone in northwestern Guangxi.Their origin has long attracted the interest of geologists.In this paper an attempt is made to use the seismic catastrophic event to interpret this unique geological phenomenon.When a strong earthquake took place in the Permian,the liquefied deposit flow produced in unlithified soft deposits of the Maokou Formation penetrated into fissures,faults or cleavages in the underlying Devo-nian lithified hard limestones under the pressures of the overlying deposits,forming limestone dikes with vertical bedding.The aforesaid process reflects different responses of soft deposits and hard rocks to a strong seismic catastrophic event. |
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| Keywords: | Lingyun Guangxi limestone dike seismic catastrophic event liquefied deposit flow |
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