The North China Basin: An example of a Cenozoic rifted intraplate basin
The North China Basin: An example of a Cenozoic rifted intraplate basin
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DOI：
10.1029/tc004i002p00153
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发表时间：
1985-02
期刊：
影响因子：
4.2
通讯作者：
Hong Ye;K. Shedlock;S. J. Hellinger;J. Sclater
中科院分区：
文献类型：
--
作者：
Hong Ye;K. Shedlock;S. J. Hellinger;J. Sclater
华北盆地是一个稳定的大陆地区，在中生代和新生代经历了几个不同的裂谷和沉降阶段。最后一个主要阶段开始于第三纪早期，其特点是块断层、快速沉降和广泛的钙碱性玄武岩火山作用。这种板内裂谷似乎是中国东北部岩石圈约 30% 的延伸和变薄的结果。到第三纪晚期，活跃的裂谷作用已经减慢，裂谷后热沉降开始。这种区域性的伸展和沉降形成了今天的华北盆地，这是一个巨大的碟形产油盆地，其地壳较薄，上地幔纵波和横波速度低于周围地区。但到了第四纪，华北盆地沉降速度加快。破坏性地震的频繁发生和相对较高的热流观测表明，第四纪构造活动不同于晚第三纪的简单热沉降模式，可能预示着新的裂谷阶段。
The North China basin was a stable continental region that has undergone several distinct phases of rifting and subsidence during the Mesozoic and Cenozoic eras. The last major phase, featuring block faulting, rapid subsidence and widespread calc-alkaline basaltic volcanism, began during early Tertiary time. This intraplate rifting appears to be the result of an approximately 30% extension and thinning of the lithosphere beneath the northeastern China. By the late Tertiary period, active rifting had slowed and postrift thermal subsidence had begun. This regional extension and subsidence resulted in the present day North China basin, a large saucer-shaped, oil producing basin with thinner crust and lower upper mantle P and S wave velocities than the surrounding regions. During the Quaternary period, however, the subsidence rate increased in the North China basin. The frequent occurrence of destructive earthquakes and observations of relatively high heat flow suggest that the Quaternary tectonic activity differs from the late Tertiary simple thermal subsidence pattern and may indicate a new phase of rifting.