渤中凹陷莫霍面特征及盆地形成机制
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摘要
横切渤中凹陷的长电缆地震剖面长约100km,记录时间达14s,探测深度超过莫霍面深达地幔。长电缆地震反射剖面揭示了渤中凹陷莫霍面起伏特征。综合分析认为,渤中凹陷古近纪及新近纪的快速沉降主要是在深部地幔物质上涌及板块之间的相互作用双重动力学背景下形成的;渤海湾盆地整体上表现出以裂陷作用为主、拉分作用为辅的联合形成机制。
There is a long-cable seismic reflection section across Bozhong depression,which is about 100 km long and recorded in two way travel time up to 14 s,with its detection depth over Moho depth and into mantle.Therefore,Moho behavior in the depression can be revealed by the long cable seismic section.According to a comprehensive analysis,it is considered that the rapid subsidence of Bozhong depression during Paleogene and Neogene has developed under a double dynamic setting,i.e.upwelling of deep mantle material and interaction among tectonic plates.As a whole,Bohai Bay basin is characterized by a combined formation mechanism,dominated by rifting and supplemented by pull-apart process.
There is a long-cable seismic reflection section across Bozhong depression,which is about 100 km long and recorded in two way travel time up to 14 s,with its detection depth over Moho depth and into mantle.Therefore,Moho behavior in the depression can be revealed by the long cable seismic section.According to a comprehensive analysis,it is considered that the rapid subsidence of Bozhong depression during Paleogene and Neogene has developed under a double dynamic setting,i.e.upwelling of deep mantle material and interaction among tectonic plates.As a whole,Bohai Bay basin is characterized by a combined formation mechanism,dominated by rifting and supplemented by pull-apart process.
引文
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[2]吴福元,葛文春,孙德有,等.中国东部岩石圈减薄研究中的几个问题[J].地学前缘,2003,10(3):51-60.
[3]邱瑞照,邓晋福,周肃,等.华北地区岩石圈类型:地质与地球物理证据[J].中国科学:D辑,2004,34(8):689-711.
[4]牛漫兰,朱光,宋传中,等.郯庐断裂带火山活动与深部地质过程新认识[J].地质科技情报,2000,19(3):21-26.
[5]万天丰.郯庐断裂带的延伸与切割深度[J].现代地质,1996,10(4):518,525.
[6]牛漫兰,朱光,宋传中,等.郯庐断裂带中南段新生代玄武岩源区地幔特征及其演化[J].现代地质,2001,15(4):383-390.
[7]朱光,宋传中,牛漫兰,等.郯庐断裂带的岩石圈结构及其成因分析[J].高校地质学报,2002,8(3):248-256.
[8]李思田.联合古陆演化周期中超大型含煤及含油气盆地的形成[J].地学前缘,1997,4(4):299-304.
[9]王红霞,郭玉贵.黄海及邻区莫霍面起伏特征[J].地球物理学进展,2005,20(2):566-573.
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