Abstract:

This paper hereby tries to summarize the common features based on observations on Wutai and Zunhua-Miyun greenstone belts in North China: (1)The greenstone belts are located at the junction of two Ancient continental nucleis with different ages and histories;(2)There are usually terrigenous clastic rocks with unconformity contact at the bottom of the greenstone belts and it can be deposited continually with different kinds of volcanic series; (3)The greenstone belts usually form independent and complete synclinorium basins. The fault-sagduction basin geotectonic model can be established on these evidences and other findings. The fault-sagduction basin is developed on the junction between initial continental nuclei and further transited to the making of greenstone belts, which is the main pattern for the Archean continental growth and evolution in the pre-plate tectonics period prior to the initiation of back-arc basin in Late Archean. In addition, this model should be further confirmed with more observations and facts.

Key words: fault-sagduction basin model, ancient continental nuclei, greenstone belt, the Archean, North China