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地质科学  2007, Vol. Issue (1): 58-69    DOI:
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关于地壳中存在大规模虚空区的问题
邱泽华, 张宝红
中国地震局地壳应力研究所 北京 100085
AN APPROACH TO EXISTENCE OF LARGE SCALE GEO-VACUUM ZONES IN EARTH’S CRUST
Qiu Zehua, Zhang Baohong
Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085
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摘要 地壳中存在大规模的虚空区。几乎所有破坏性的大地震都造成了大规模的地面下沉,正是因为虚空区的存在才使这种下沉成为可能;震碛岩的C单元则是这种地面沉陷现象的地质记录。虚空区的基本特点是其内部的实际垂向压力小于静压力。构造运动导致的这种垂向压力与周围压力之差,将使虚空区的岩石发生扩容。科拉半岛上超深钻探发现大量含自由水的裂隙带,证实了地壳中虚空区的存在。一般地说,可以通过探查地壳中的低速层来发现和研究虚空区。
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邱泽华
张宝红
关键词虚空区   扩容   低速层   地震地面下沉   构造塌陷     
Abstract: There might exist large scale geo-vacuum zones in the earth’s crust. Almost all destructive great earthquakes in China during history resulted in significantly extensive subsidence that could only reasonably be attributed to the existence of geo-vacuum zones in the crust. A geo-vacuum zone was basically characterized to be under a situation of lower vertical pressure than the theoretic hydrostatic pressure at the depth. Such vertical pressure decrease was induced by tectonic movements and might produce dilatancy of the rocks. Discoveries in the super-deep drilling well in the Kola Peninsula further confirmed the existence of such phenomena. Generally speaking, such geo-vacuum zones could be located and studied by investigating low velocity zones in the crust and synthesizing the data of geophysical survey. Geological evidence and implications, such as stratigraphic records of earthquake, lithological evidence and implication of fissure in oil-gas exploration, were discussed in the paper. In addition, the mechanism of geo-vacuum zone’s formation was briefly discussed in the paper.
Key wordsGeo-vacuum zone   Dilatancy   Low-velocity layer   Co-seismic subsidence   Tectonic collapse   
收稿日期: 2006-01-15;
基金资助:地震科学联合基金资助项目(编号:106071)
引用本文:   
邱泽华,张宝红. 2007, 关于地壳中存在大规模虚空区的问题. 地质科学, (1): 58-69.
Qiu Zehua,Zhang Baohong. AN APPROACH TO EXISTENCE OF LARGE SCALE GEO-VACUUM ZONES IN EARTH’S CRUST[J]. Chinese Journal of Geology, 2007, (1): 58-69.
 
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[1] 贾 蔡 袁 峰 李晓晖 胡训宇 廖宝胜 孙维安 . 基于多源数据约束的成矿动力学模拟——以宁芜盆地钟姑矿田典型矿床为例[J]. 地质科学, 2018, 53(4): 1327-1346.
[2] 周小鹏, 王晓, 张新彦, 白志明, 滕吉文. 探测壳内低速层的深地震测深方法及应用[J]. 地质科学, 2015, 50(4): 1244-1260.
 
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