Identification of Five Stages of Dike Swarms in the Shanxi‐Hebei‐Inner Mongolia Border Area and Its Tectonic Implications
Identification of Five Stages of Dike Swarms in the Shanxi‐Hebei‐Inner Mongolia Border Area and Its Tectonic Implications
复制标题
DOI：
10.1111/j.1755-6724.2004.tb00706.x
复制
发表时间：
2004-02
期刊：
影响因子：
--
通讯作者：
Shao Ji’an;Zhai Mingguo;Zhang Lüqiao;L. Daming
中科院分区：
文献类型：
--
作者：
Shao Ji’an;Zhai Mingguo;Zhang Lüqiao;L. Daming
岩墙群一般被认为是伸展作用导致的幔源岩浆侵入形成的。华北北方周缘晋冀蒙交界一带基性岩墙群的同位素年龄可划分为1800-1700 Ma、800-700 Ma、230 Ma、140-120 Ma和50-40 Ma五个年龄组。通过对这5个群的地质、岩石学和同位素地球化学特征的研究，探讨了该区地幔物质组成随时间的变化。并将这五组岩墙群所反映的各种伸展活动与同期华北地区及世界范围内的一些重要构造事件进行了对比。
Abstract Dike swarms are generally ascribed to intrusion of mantle‐source magma result from extension. Basic dike swarms around the Shanxi‐Hebei‐Inner Mogolia borders in the northern peripheral area of the North China Craton can be divided into five age groups according to isotopic dating: 1800–1700 Ma, 800–700 Ma, 230 Ma, 140–120 Ma, and 50–40 Ma. Geological, petrological and isotope geochemical features of the five groups is investigated in order to explore the variation of the mantle material composition in the concerned area with time. And the various extensional activities reflected by the five groups of dike swarms are compared with some important tectonic events within the North China Craton as well as around the world during the same period.