| 华北裂陷盆地不同块体地壳结构及演化研究 |
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| 引用本文： | 嘉世旭,张先康,方盛明.华北裂陷盆地不同块体地壳结构及演化研究[J].地学前缘,2001,8(2):259-266. |
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| 作者姓名： | 嘉世旭 张先康 方盛明 |
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| 作者单位： | 中国地震局地球物理勘探中心, |
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| 基金项目： | 国家重点基础研究发展规划项目!“大陆强震机理与预测”(95 13 0 2 0 1) (中国地震局地球物理勘探中心科技成果编号 :
GPB2 0 0 10 4) |
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| 摘 要： | 通过对华北裂陷盆地内不同块体的深地震测深资料处理 ,得到与构造演化过程相关的、不同性质块体的地壳结构特征。盆地隆起区块体地壳一般呈均匀成层 ,速度随深度逐层增加 ,保留了古大陆地壳块体的稳定结构特征 ;盆地坳陷区块体地壳松散巨厚的表层沉积、通常低速占主导的壳内构造、强反射的下地壳和高低速相间的薄互层壳 幔过渡带 ,反映了上地幔物质上隆、侵入、地壳增温、张裂等塑、脆性变形改造的新生地壳构造。讨论了这两类截然不同块体地壳构造的地球动力学演化及形成。裂陷区内中强地震的孕发和深源矿产、油气生贮存等都与这两类块体地壳结构、构造密切相关。
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| 关 键 词： | 华北裂陷盆地 深地震测深 地壳块体结构 动力学演化 |
| 文章编号： | 1005-2321(2001)02-0259-08 |
| 修稿时间： | 2001年2月11日 |
RESEARCH ON THE CRUSTAL STRUCTURE AND EVOLUTION OF DIFFERENT BLOCKS IN NORTH CHINA RIFT-DEPRESSION BASIN |
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| JIA Shi-xu,ZHANG Xian-kang,FANG Sheng-Ming.RESEARCH ON THE CRUSTAL STRUCTURE AND EVOLUTION OF DIFFERENT BLOCKS IN NORTH CHINA RIFT-DEPRESSION BASIN[J].Earth Science Frontiers,2001,8(2):259-266. |
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| Authors: | JIA Shi-xu ZHANG Xian-kang FANG Sheng-Ming |
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| Abstract: | Crustal structures of blocks with different features associated with tectonic evolution process are got by processing of DSS data of different blocks within the North China rift depression basin. The blocks in uplifts of the basin generally have the crust that is homogeneously layered and the velocity in the crust increases gradually with depth. The blocks retain the stable structure characteristics of palaeocontinental crustal blocks. The blocks in depressed regions of the basin show the following features:the loose surface sediment with huge thickness, the structure within the crust that low velocity dominates generally , the lower crust with strong reflection and the crust mantle transitional zone consisting of laminated high and low velocities. These features manifest the juvenile crustal structure with upwelling and intrusion of upper mantle material , with crustal temperature increase and with plastic and brittle deformation such as the rift. Formation and evolution of geodynamics are discussed in these two completely different types of blocks. In the rift depression region, the moderate earthquakes and the deposits of deep mineral resources and hydrocarbon are all closely related to the crustal structure and tectonic of these two types of blocks. |
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| Keywords: | North China rift depression basin DSS structure of crustal blocks dynamic evolution |
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