NEW ADVANCES IN THE STUDY OF NEOPROTEROZOIC-PALEOPROTEROZOIC CRUSTAL EVOLUTION IN THE TAISHAN AREA

At the end of the Middle Archean there occurred komatiitic and tholejitic greenstone andstrong folding and metamorphism. The Neoproterozoic-paleoproterozoic clearly witnessed fiveintrusive events of abyssal magmas. Between 1800-1700 Ma B.P. the Taishan area was com-pletely rigidized, accompanied by an additional break-up and formation of the Jining depres-sion. In the study area a straight diabase dike is injected along the fault system and extends upto a few tens of kilorneters.