豫西后造山阶段存在变质核杂岩吗?

REALLY EXIST POSTOROGENIC METAMORPHIC CORE COMPLEX IN WESTERN HENAN?

不少学者用变质核杂岩模式解释豫西造山阶段基底隆起和与之相伴的盆岭构造的构造格局。介一本区基底隆起的形态、机制、时限和地壳剥露层次均没有变质核杂岩特征与基底隆起相伴的断陷人舅地也不同于变质核杂岩模式中的半地堑。

Using metamorphic core complex (MCC) models, many geologists interpret the tectonic framework featuring the basement dome and the basin-and-range tectonics in western Henan in the postorogenic stage. But the morphological features, machnism, timing and denuded crustal layer of the basement dome in this region do not display the features of the MCC. The down-faulted basin accompanying the basement dome is different from the half-graben in the MCC model also. Additionally, the unconformity surface between the cover Xiong'er Group and the basement Taihua Group in this region cannot be determined as the detachment fault plane either. Based on the above, this paper questions the validity of the assertion that 'MCCs existed in western Henan in the postorogenic stage'.