摘要
古大陆边缘变质地质体性质的确定对于探讨大地构造演化具有十分重要的意义。由于后期变形变质作用的影响,原先不同的构造单元往往被改造成看似完整的一套地层单元,但在同位素年龄、变质程度、岩浆活动与地层的专属组合及其空间延伸等方面则变化很大,这在华北古陆北缘的单塔子群和南缘的太华群中最为典型。因此,笔者建议用“构造-岩相杂岩体带”填图法来取代以地层为骨架的变质岩区地质制图,这有助于确定该地区的大地构造演化进程。
The determination of the characteristics of metamorphic terran es on paleocontinental margins is very important for studying the tectonic evol ution.Because of late-stage deformation and metamorphism,the originally diff erent tectonic units have been modified into a seemingly complete set of strat igraphic units,but there are great differences in isotopic age,metamorphic gr ade,special association between mag-matism and strata,and spatial extension, which is the most typical in the Dantazi Group on the northern margin and the Ta ihua Group on the southern margin of the North China continental nucleus.So th e au-thors suggest that the mapping method of 'structure-rock facies complex zone'be used to substitute for the stratigraphic method in metamorphic terrane s,which is helpful to determining the tectonic evolution in the area.
出处
《中国地质》
CAS
CSCD
2002年第3期281-285,共5页
Geology in China
基金
国家自然科学基金项目(49832002
49872065)
