摘要
太华群具明显的两分性特征，下亚群属下部基底岩系，原岩为拉斑玄武岩及ＴＴＧ岩系；上亚群属上部基底岩系，具孔达岩系特征的一套沉积变质岩。根据生物地层学、岩石地层学、构造地层学、同位素年代学，提出了小秦岭地区的太华群上下亚群是不同地质时期、不同构造环境下的产物，下亚群时代为晚太古代，上亚群时代为古元古代，故太华群应予以解体．或给以新的内涵。
On the base of systomatic historical review to strata n Group Taihua' in the mountain Small Qinling inthe west of Province Henan have been discussed stratigraphical division and sequence of these strata' This article points out, that the Group Taihua obviously has a characteristic of dichotomization: the lower subgroupbelongs to the lower base rocks and their primary rocks are tholeiit and TTG complex I the upper subgroup isthe upper base base rocks, that are a set of sedimentary metamorphic rocks and possess characteristics ofkhondalite complesx. According to the biostratigraphy, petrostatigaphy, tectonic stratigraphy and isotopechronology, posed that the upper and lower subgroups of the Group Taihua in the region Small Qinling areproducts in the different tectonic surroundinngs and at different geological periods. The lower subgroup oughtto put to Late Archeozoic Period, while the upper subgroup-- Paleoproterozoic Period, 'and then the GroupTaihua should be separated, or give it new meaning.
关键词
小秦岭
太华群
晚太古代
古元古代
地层
Mountain Small Qinling, Group Taihua, dichotomization, Late Archeozoic Period, PaleoproteozicPeriod
