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引用本文:任新红1 赵 文1 文江泉1 郑立宁2. 华北奥陶系含膏角砾岩气爆成因探讨[J]. 中国地质, 2013, 40(2): 612-618.
REN Xin-hong1, ZHAO Wen1, WEN Jiang-quan1, ZHENG Li-ning2. A tentative discussion on the air burst genesis of the Ordovician gypsum-bearing breccia in North China[J]. Geology in China, 2013, 40(2): 612-618(in Chinese with English abstract).
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华北奥陶系含膏角砾岩气爆成因探讨
任新红1 赵 文1 文江泉1 郑立宁21,2
1.西南交通大学地球科学与环境工程学院, 四川 成都 610031;2.中国建筑西南勘察设计研究院有限公司,四川 成都 610081
摘要:
提要:根据华北奥陶系含膏角砾岩形态特征,对其成因进行初步分析。利用数值方法分析含膏角砾岩形成期地温特征,表明其存在粘土矿物及石膏脱水的温度条件。对加温条件下含膏泥岩孔隙气体压力进行实验研究,显示在较高温度条件下,含膏泥岩石膏脱水将产生极高的孔隙水压力。扫锚电镜和能谱分析结果反映出高温条件下石膏矿物结构发生了较大的变化。分析结果表明,华北奥陶系含膏角砾岩具备气爆成因条件。
关键词:  含膏角砾岩  气爆  孔隙气压  扫描电镜  能谱分析
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A tentative discussion on the air burst genesis of the Ordovician gypsum-bearing breccia in North China
REN Xin-hong1, ZHAO Wen1, WEN Jiang-quan1, ZHENG Li-ning21,2
1. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong Unversity, Chengdu 610031, Sichuan, China;2. China Southwest Geotechnical Investigation & Design Institute Co., Ltd., Chengdu 610081, Sichuan, China
Abstract:
Abstract:Based on its morphological characteristics, this paper made a preliminary analysis of the genesis of the Ordovician gypsum-bearing breccia in North China. The geothermal characteristics during the formation stage of the gypsum-bearing breccia were analyzed with the numerical method, and the results show that the temperature condition for the dewatering of clay minerals and gypsum did exist. The pore gas pressure of gypsum-bearing mudstone at high temperature was analyzed with the experimental method, and the result shows that extremely high pore gas pressure will be generated by gypsum dewatering at high temperature. The SEM and energy spectrum analysis show that the mineral structure of gypsum is changed at high temperature. It is thus held that the gypsum-bearing breccia in North China might have been generated by air burst.
Key words:  gypsum-bearing breccia  air burst  pore gas pressure  SEM  energy spectrum analysis